CN1564015A - Method of self-calibrating of current ratio standard device - Google Patents

Abstract

The device includes self-balanced current comparator, self-checking circuit, primary and secondary circuits and meter for measuring difference. After steps of self-checking, addition, comparison, measuring beta, and multiplication, absolute calibration of current scale is completed, and error of current scale of each self-balanced current comparator is obtained. Wiring is as following: H end of power source is connected to L1 end of comparator to be measured. L2 end and K2 end of comparator are connected to each other. K1 end of comparator to be measured through resistance is connected to ground end and L end of power source. Positive end of meter for measuring difference is connected to the said K2, and its negative end is connected to ground. The device is simple in structure and provides features of quick calibration and high efficiency.

Description

The self-alignment method of a kind of current ratio standard device

Technical field

The invention belongs to the electric instrument class, be specifically related to the self-alignment method of a kind of current ratio standard device.

Background technology

The self-alignment current ratio standard of energy is that the present checking circuit of China also adopts this scheme basically, has only done some improvement aspect Current Regulation by Ku Site people such as (Kuster) proposition of National Research Council of Canada at first.(referring to JJG2082-90 " power current ratio measurement instrument " and JJF1068-2000 " power current ratio standard device calibrating standard "), the current ratio standard self-calibration system of forming by this scheme, the deficiency that following several respects are arranged: 1, because whole calibration process all is manual control, wiring is loaded down with trivial details, and work efficiency is very low.2, owing to be the manual shift balance, speed is too slow, does not catch up with the fluctuation of primary current sometimes, and this just causes test to carry out.3, occupation area of equipment is big.

Summary of the invention

Deficiency at prior art exists for solving the calibration problem fast and efficiently of current ratio standard, the invention provides the self-alignment method of a kind of current ratio standard device.

To achieve these goals, technical scheme of the present invention is: the self-alignment method of a kind of current ratio standard device, the current ratio standard device comprises the self-equilibrating current comparator, through self-correcting, addition, comparison, survey β and multiplication step, finish the absolute calibration of current ratio, obtain each self-equilibrating current comparator current ratio error, the used current comparator of the present invention is the self-equilibrating current comparator, hereinafter to be referred as current comparator;

The current ratio standard device divides DC current ratio standard device and alternating current ratio standard device, because DC current ratio standard device generally all has the secondary current indication, so its calibration circuit is slightly simpler than exchanging the calibration circuit, difference current measuring instrument (hereinafter to be referred as difference-measuring instrument) only need be measured the difference of secondary current, can obtain ε p divided by the secondary current actual value then.To alternating current ratio standard device, as long as the secondary current of standard comparator is converted into voltage gives difference-measuring instrument, then DC line also is fit to alternating current ratio standard device fully.The old friend flows the self calibration circuit of current ratio standard device, and we only provide self-correcting circuit and multiplication circuit, and all the other additions, survey β, alternative route can similarly obtain.

Self-equilibrating current comparator: L1 L2: a winding, K1 K2: Secondary Winding, L1, L2 and K1, electric the going up of K2 are isolated, and L2, K2 are end of the same name, and even primary current I1 advances from L2, and then secondary current I2 goes out from K2;

(1), self-correcting:

When the current ratio n=1 of current comparator, ε x represents the error of tested comparator TX current ratio, and ε p represents the relative error that difference-measuring instrument records, and then has:

εx＝εp；

(2), relatively:

When two current comparator current ratios are identical,, then have if reference comparator T0 error is ε 0:

εx＝ε0+εp；

(3), addition:

Be rated transformation ratio n reference comparator T0 once with the secondary current addition, primary current as another comparator TX, the current ratio of adjustable comparator TX (n+1), represent that with β reference comparator T0 flows through the electric current and the relative error that flows through the electric current of polar end of Secondary Winding non-polar end, then has:

${\mathrm{\ϵ}}_x=\frac{{\mathrm{n\ϵ}}_0-\mathrm{\β}}{n+1}+{\mathrm{\ϵ}}_p;$

(4), survey β:

Reference comparator T0 error is ε 0, then has:

β＝ε _p-ε ₀；

(5), multiplication:

Two current comparator cascades, the current ratio after the combination is the product of two comparator current ratios, i.e. nx=n0 * n1, with ε x, ε 0,, ε 1 represents then have the ratio error of three comparator TX, T0, T1 respectively:

ε _x＝ε ₀+ε ₁+ε _p；

It is characterized in that the concrete circuit method of each step is:

DC current comparator self-correcting circuit

First and second loop: the L1 of the tested comparator Tx of H termination of power supply end, the K2 end of the tested comparator Tx of L2 termination of tested comparator Tx, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, another current terminal ground connection of resistance R x also connects the L end of power supply;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of the tested comparator Tx of anodal termination, difference-measuring instrument electric current input negative pole end ground connection;

DC current comparator alternative route

Primary circuit: the L1 end of the H termination reference comparator T0 of power supply, the L2 end of the tested comparator Tx of L2 termination of reference comparator T0, the L end of the L1 termination power of tested comparator Tx;

Secondary circuit: the K2 end of the tested comparator Tx of K2 termination of reference comparator T0, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, another current terminal ground connection of resistance R x and the current terminal of connecting resistance R0, the K1 end of another electric current termination reference comparator T0 of resistance R 0;

Potential tracking method instrument: the L2 end of the input H termination reference comparator T0 of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the output H termination reference comparator T0 of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator T0, difference-measuring instrument electric current input negative pole end ground connection; DC current comparator addition circuit:

Primary circuit: the L1 end of the H termination reference comparator T0 of power supply, the L2 end of the tested comparator Tx of L2 termination of reference comparator T0, the L end of the L1 termination power of tested comparator Tx;

First and second loop: the K2 end of the tested comparator Tx of K2 termination of reference comparator T0, the current terminal of the K1 terminating resistor R0 of reference comparator T0, the L2 end of another electric current termination reference comparator T0 of resistance R 0, the K1 terminating resistor Rx current terminal of tested comparator Tx, another current terminal ground connection of resistance R x;

Potential tracking method instrument: the L2 end of the tested comparator Tx of input H termination of potential tracking method instrument, the input L end ground connection of potential tracking method instrument, the L1 end of the tested comparator Tx of output H termination of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator T0, difference-measuring instrument electric current input negative pole end ground connection; The DC current comparator is surveyed the β circuit:

The primary circuit: the L1 end of the tested comparator Tx of H termination of power supply, the L2 of tested comparator Tx are held ground connection and are connect the L end of power supply;

First and second loop: the K2 end of the K2 termination reference comparator T0 of tested comparator Tx, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, the L2 end of another electric current termination reference comparator T0 of resistance R x, the current terminal of the K1 terminating resistor R0 of reference comparator T0, another current terminal ground connection of resistance R 0;

Potential tracking method instrument: the L2 end of the input H termination reference comparator T0 of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the output H termination reference comparator T0 of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator T0, negative pole end ground connection; DC current comparator multiplication circuit:

Primary circuit: the L1 end of the tested comparator Tx of H termination of power supply, the L2 end of the L2 termination reference comparator T0 of tested comparator Tx, the L end of the L1 termination power of reference comparator T0;

Intermediate loop: the K2 of reference comparator T0 holds ground connection and connects the L2 end of current comparator T1, the current terminal of the L1 terminating resistor R0 of current comparator T1, the K1 end of another electric current termination reference comparator T0 of resistance R 0;

Secondary circuit: the K2 end of the K2 termination current comparator T1 of tested comparator Tx, the current terminal of the K1 terminating resistor R1 of current comparator T1, another current terminal ground connection of resistance R 1 and the current terminal of connecting resistance Rx, the K1 end of the tested comparator Tx of another electric current termination of resistance R x;

Potential tracking method instrument: the L2 end of the tested comparator Tx of input H termination of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the tested comparator Tx of output H termination of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination current comparator T1, difference-measuring instrument electric current input negative pole end ground connection.

Described self-equilibrating current comparator is the self-equilibrating AC current comparator, as long as give difference-measuring instrument after the secondary current of self-equilibrating AC current comparator is converted into voltage, then above-mentioned self-correcting, addition, comparison, survey β and multiplication circuit also are fit to the self-equilibrating AC current comparator fully.

AC current comparator self-correcting circuit:

First and second loop: the L1 end of the tested comparator Tx of power supply H termination, the K2 end of the tested comparator Tx of L2 termination of tested comparator Tx, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, another current terminal ground connection of resistance R x and the current terminal of connecting resistance R0, the L end of another electric current termination power of resistance R 0;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of the tested comparator Tx of anodal termination, difference-measuring instrument electric current input negative pole end ground connection,

The voltage input H end of the current potential output H termination difference-measuring instrument of resistance R 0; The current potential output L termination difference-measuring instrument of resistance R 0

Voltage input L end.

AC current comparator multiplication circuit:

Primary circuit: the L1 end of the tested comparator Tx of power supply H termination, the L2 end of the L2 termination reference comparator T0 of tested comparator Tx, the L end of the L1 termination power of reference comparator T0.

Intermediate loop: the K2 of reference comparator T0 holds ground connection and connects the L2 end of comparator T1, the current terminal of the L1 terminating resistor R0 of comparator T1, the K1 end of another electric current termination reference comparator T0 of resistance R 0;

Secondary circuit: the K2 end of the K2 termination comparator T1 of tested comparator Tx, the current terminal of the K1 terminating resistor R1 of comparator T1, another current terminal ground connection of resistance R 1 and the current terminal of connecting resistance Rx, the K1 end of the tested comparator Tx of another electric current termination of resistance R x;

Potential tracking method instrument: the L2 end of the tested comparator Tx of input H termination of potential tracking method instrument, the input L end ground connection of potential tracking method instrument, the L1 end of the tested comparator Tx of output H termination of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination comparator T1, difference-measuring instrument electric current input negative pole end ground connection, the voltage input H end of the current potential output H termination difference-measuring instrument of resistance R 1, the voltage input L end of the current potential output L termination difference-measuring instrument of resistance R 1.

Self-correcting, addition, comparison, survey β and multiplication line construction that the present invention adopts are simple, easy to use, and the calibration with current ratio standard is characteristics fast and efficiently.

With the multiplication circuit is that example does one relatively.

The multiplication circuit that JJF1068-2000 proposed (see Fig. 9, be called for short existing scheme), the solution of the present invention is seen Fig. 8 (abbreviation new departure).Two kinds of used master equipment list (MEL)s of scheme are as follows:

Existing scheme (platform) new departure (platform)

Current comparator 33

Auxiliary current transformer 20

Zero indicator 30

Zeroing load box 20

Potential tracking method instrument 01

Existing scheme adopts one of following two kinds of methods to primary circuit common point ground connection, A, utilizes the single compensation winding of comparator.B, with Wagner symmetry branching (to there not being the comparator of single compensation winding), this must increase capacitive and electric guide box.And new departure uses automatic potential tracking method instrument.Existing scheme value reproduction once often needs 10-20 working day, the about 2-3 of new departure days.

The existing in addition used manual balanced balanced current comparator of scheme wiring is very complicated, once winding, single compensation winding, Secondary Winding, second compensation winding, nulling winding.Auxiliary current transformer again once winding, Secondary Winding, connect the secondary assistant winding of zeroing case, also have zero indicator.Every balance once, the user will regulate the homophase and the quadrature dish of auxiliary zeroing case repeatedly, switches the sensitivity shelves of zero indicator then, finally the comparator balancing.And use the self-poise current comparator in new departure, comparator for once and Secondary Winding, the balance of comparator is finished automatically, and is simple in structure, easy to use.

Description of drawings

Fig. 1 is the principle synoptic diagram of self-equilibrating current comparator

Fig. 2 is a DC current comparator self-correcting wiring diagram of the present invention

Fig. 3 is DC current comparator alternative route figure of the present invention

Fig. 4 is DC current comparator addition circuit figure of the present invention

Fig. 5 is that DC current comparator of the present invention is surveyed the β wiring diagram

Fig. 6 is a DC current comparator multiplication wiring diagram of the present invention

Fig. 7 is an AC current comparator self-correcting wiring diagram of the present invention

Fig. 8 is an AC current comparator multiplication wiring diagram of the present invention

Fig. 9 is existing AC current comparator multiplication wiring diagram

Embodiment

The self-alignment method of a kind of current ratio standard device, the current ratio standard device comprises 4 (minimum three, the general 3-5 platform of using, use more convenient when making current expansion, and the difficulty of making comparator reduces) the self-equilibrating current comparator, through self-correcting, addition, survey β, comparison, and multiplication step, thereby finish the absolute calibration of current ratio, obtain each current comparator current ratio error.

The principle synoptic diagram of self-equilibrating current comparator can be represented with Fig. 1.L1 L2 a: winding; K1 K2: Secondary Winding.L1, L2 and K1, electric the going up of K2 are isolated.

L2, K2 are end of the same name, and even primary current I1 advances from L2, and then secondary current I2 goes out from K2.

Concrete calibration circuit is as follows:

1, DC current comparator self-correcting circuit

When the current ratio n=1 of current comparator, its error can be by the self-correcting route survey.Scheme circuit is shown in figure two.

First and second loop: the L1 of the tested comparator Tx of H termination of power supply end, the K2 end of the tested comparator Tx of L2 termination of tested comparator Tx, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, another current terminal ground connection of resistance R x also connects the L end of power supply;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of the tested comparator Tx of anodal termination, difference-measuring instrument electric current input negative pole end ground connection;

ε x represents the error of tested comparator TX current ratio, and ε p represents the relative error that difference-measuring instrument records, and then has.

εx＝εp (1)

2, DC current comparator alternative route

When two current comparator current ratios are identical, can directly compare their error, measuring circuit is shown in figure three.

Primary circuit: the L1 end of the H termination reference comparator T0 of power supply, the L2 end of the tested comparator Tx of L2 termination of reference comparator T0, the L end of the L1 termination power of tested comparator Tx;

Secondary circuit: the K2 end of the tested comparator Tx of K2 termination of reference comparator T0, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, another current terminal ground connection of resistance R x and the current terminal of connecting resistance R0, the K1 end of another electric current termination reference comparator T0 of resistance R 0;

Potential tracking method instrument: the L2 end of the input H termination reference comparator T0 of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the output H termination reference comparator T0 of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator T0, difference-measuring instrument electric current input negative pole end ground connection; The effect of potential tracking method instrument is by regulating its output voltage, making the current potential of input H end be in earth potential.If reference comparator T0 error is ε 0, then have:

εx＝ε0+εp (2)

3, DC current comparator addition circuit

Be rated transformation ratio n reference comparator T0 once with the secondary current addition, as the primary current of another comparator TX, the current ratio of adjustable comparator TX (n+1), measuring circuit is seen Fig. 4.

Primary circuit: the L1 end of the H termination reference comparator T0 of power supply, the L2 end of the tested comparator Tx of L2 termination of reference comparator T0, the L end of the L1 termination power of tested comparator Tx;

First and second loop: the K2 end of the tested comparator Tx of K2 termination of reference comparator T0, the current terminal of the K1 terminating resistor R0 of reference comparator T0, the L2 end of another electric current termination reference comparator T0 of resistance R 0, the K1 terminating resistor Rx current terminal of tested comparator Tx, another current terminal ground connection of resistance R x;

Potential tracking method instrument: the L2 end of the tested comparator Tx of input H termination of potential tracking method instrument, the input L end ground connection of potential tracking method instrument, the L1 end of the tested comparator Tx of output H termination of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator T0, difference-measuring instrument electric current input negative pole end ground connection;

Represent that with β reference comparator T0 flows through the electric current and the relative error that flows through the electric current of polar end of Secondary Winding non-polar end, then has:

${\mathrm{\ϵ}}_x=\frac{{\mathrm{n\ϵ}}_0-\mathrm{\β}}{n+1}+{\mathrm{\ϵ}}_p---\left(3\right)$

4, the DC current comparator is surveyed the β circuit

The available Fig. 5 route survey of β value.

The primary circuit: the L1 end of the tested comparator Tx of H termination of power supply, the L2 of tested comparator Tx are held ground connection and are connect the L end of power supply;

First and second loop: the K2 end of the K2 termination reference comparator T0 of tested comparator Tx, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, the L2 end of another electric current termination reference comparator T0 of resistance R x, the current terminal of the K1 terminating resistor R0 of reference comparator T0, another current terminal ground connection of resistance R 0;

Potential tracking method instrument: the L2 end of the input H termination reference comparator T0 of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the output H termination reference comparator T0 of potential tracking method instrument, the L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator T0, negative pole end ground connection; Reference comparator T0 error is ε 0, then has:

β＝ε _p-ε ₀ (4)

5, DC current comparator multiplication circuit

Two current comparator cascades, the current ratio after the combination is the product of two comparator current ratios, and promptly nx=n0 * n1 multiplication circuit as shown in Figure 6

Primary circuit: the L1 end of the tested comparator Tx of H termination of power supply, the L2 end of the L2 termination reference comparator T0 of tested comparator Tx, the L end of the L1 termination power of reference comparator T0;

Intermediate loop: the K2 of reference comparator T0 holds ground connection and connects the L2 end of current comparator T1, the current terminal of the L1 terminating resistor R0 of current comparator T1, the K1 end of another electric current termination reference comparator T0 of resistance R 0;

Secondary circuit: the K2 end of the K2 termination current comparator T1 of tested comparator Tx, the current terminal of the K1 terminating resistor R1 of current comparator T1, another current terminal ground connection of resistance R 1 and the current terminal of connecting resistance Rx, the K1 end of the tested comparator Tx of another electric current termination of resistance R x;

Potential tracking method instrument: the L2 end of the tested comparator Tx of input H termination of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the tested comparator Tx of output H termination of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination current comparator T1, difference-measuring instrument electric current input negative pole end ground connection.

, with ε x, ε 0,, ε 1 represents then have the ratio error of three comparator TX, T0, T1 respectively:

ε _x＝ε ₀+ε ₁+ε _p (5)

Also can obtain the division expression formula with Fig. 6, promptly n0=nx/n1 can be used for measuring the current ratio less than 1 as nx during less than n1, and the error of tested comparator can be calculated according to multiplication error relation.

6, ratio transmission

With self-correcting, comparison, addition, survey β, multiplication, the dividing line of current comparator, can realize the expansion of current ratio from 1/1 to m/n.

The self-calibration system that the current comparator self-correcting circuit that utilizes this programme to provide is formed can be simplified wiring, increases work efficiency greatly.

The current ratio standard device divides DC current ratio standard device and alternating current ratio standard device, because DC current ratio standard device generally all has the secondary current indication, so its calibration circuit is slightly simpler than exchanging the calibration circuit, difference current measuring instrument (hereinafter to be referred as difference-measuring instrument) only need be measured the difference of secondary current, can obtain ε p divided by the secondary current actual value then.To alternating current ratio standard device, as long as the secondary current of standard comparator is converted into voltage gives difference-measuring instrument, then DC line also is fit to alternating current ratio standard device fully.The old friend flows the self calibration circuit of current ratio standard device, and we only provide self-correcting circuit and multiplication circuit, and all the other additions, survey β, alternative route can similarly obtain.

7, AC current comparator self-correcting circuit:

As shown in Figure 7, first and second loop: the L1 end of the tested comparator Tx of power supply H termination, the K2 end of the tested comparator Tx of L2 termination of tested comparator Tx, the current terminal of the K1 terminating resistor Rx of tested comparator Tx, another current terminal ground connection of resistance R x and the current terminal of connecting resistance R0, the L end of another electric current termination power of resistance R 0;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of the tested comparator Tx of anodal termination, difference-measuring instrument electric current input negative pole end ground connection, the voltage input H end of the current potential output H termination difference-measuring instrument of resistance R 0; The voltage input L end of the current potential output L termination difference-measuring instrument of resistance R 0.

ε x represents the error of tested comparator TX current ratio, and ε p represents the relative error that difference-measuring instrument records, and then has.

εx＝εp (6)

8, AC current comparator multiplication circuit:

As shown in Figure 8, primary circuit: the L1 end of the tested comparator Tx of power supply H termination, the L2 end of the L2 termination reference comparator T0 of tested comparator Tx, the L end of the L1 termination power of reference comparator T0.

Intermediate loop: the K2 of reference comparator T0 holds ground connection and connects the L2 end of comparator T1, the current terminal of the L1 terminating resistor R0 of comparator T1, the K1 end of another electric current termination reference comparator T0 of resistance R 0;

Secondary circuit: the K2 end of the K2 termination comparator T1 of tested comparator Tx, the current terminal of the K1 terminating resistor R1 of comparator T1, another current terminal ground connection of resistance R 1 and the current terminal of connecting resistance Rx, the K1 end of the tested comparator Tx of another electric current termination of resistance R x;

Potential tracking method instrument: the L2 end of the tested comparator Tx of input H termination of potential tracking method instrument, the input L end ground connection of potential tracking method instrument, the L1 end of the tested comparator Tx of output H termination of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination comparator T1, difference-measuring instrument electric current input negative pole end ground connection, the voltage input H end of the current potential output H termination difference-measuring instrument of resistance R 1, the voltage input L end of the current potential output L termination difference-measuring instrument of resistance R 1.

With ε x, ε 0,, ε 1 represents then have the ratio error of three comparator TX, T0, T1 respectively:

ε _x＝ε ₀+ε ₁+ε _p (7)

Also can obtain the division expression formula with Fig. 8, promptly n0=nx/n1 can be used for measuring the current ratio less than 1 as nx during less than n1, and the error of tested comparator can be calculated according to multiplication error relation.

With the self-calibrating device that this programme is formed, finish the absolute calibration of current ratio from 5/5 → 5000/5, whole self-calibrating device is made up of 4 self-equilibrating current comparators, two of 50A self-equilibrating current comparators (numbering A, B), current ratio is

One of 500A self-equilibrating current comparator, numbering C, current ratio is

One of 5000A self-equilibrating current comparator, numbering D, current ratio is:

Concrete steps:

1, two self-equilibrating current comparators of A, B are finished calibration through self-correcting, addition, survey β, alternative route.For example the A platform 5/5, finishes calibration with the self-correcting circuit, and through addition, survey β circuit calibration B platform 10/5, B platform 10/5 is calibrated A platform 10/5 through alternative route, and the like, finish up to the whole calibrations of two all proportions of A, B.

2,500A self-equilibrating current comparator C by two comparators of A, B, finishes calibration with the multiplication circuit.Be that C=A * B is specific as follows:

75/5＝25/5×15/5

100/5＝50/5×10/5

150/5＝50/5×15/5

200/5＝50/5×20/5

300/5＝50/5×30/5

500/5＝50/5×50/5

3,5000A self-equilibrating current comparator D by two comparators of A (or B), C, finishes calibration with the multiplication circuit.Be that D=A (or B) * C is specific as follows:

750/5＝150/5×25/5

1000/5＝500/5×10/5

1500/5＝500/5×15/5

2000/5＝500/5×20/5

3000/5＝500/5×30/5

4000/5＝500/5×40/5

5000/5＝500/5×50/5

Through self calibration, the accuracy of each comparator is as follows:

A platform 2 * 10-7

B platform 2 * 10-7

C platform 5 * 10-7

D platform 5 * 10-7

Claims (4)

1. self-alignment method of current ratio standard device, the current ratio standard device comprises the self-equilibrating current comparator, through self-correcting, addition, comparison, survey β and multiplication step, finish the absolute calibration of current ratio, obtain each self-equilibrating current comparator current ratio error;

Self-equilibrating current comparator: L1 L2: a winding, K1 K2: Secondary Winding, L1, L2 and K1, electric the going up of K2 are isolated, and L2, K2 are end of the same name, and even primary current I1 advances from L2, and then secondary current I2 goes out from K2;

(1), self-correcting:

When the current ratio n=1 of current comparator, ε x represents the error of tested comparator TX current ratio, and ε p represents the relative error that difference-measuring instrument records, and then has:

εx＝εp；

(2), relatively:

When two current comparator current ratios are identical,, then have if reference comparator T0 error is ε 0:

εx＝ε0+εp；

(3), addition:

Be rated transformation ratio n reference comparator T0 once with the secondary current addition, primary current as another comparator TX, the current ratio of adjustable comparator TX (n+1), represent that with β reference comparator T0 flows through the electric current and the relative error that flows through the electric current of polar end of Secondary Winding non-polar end, then has:

${\mathrm{\ϵ}}_x=\frac{{\mathrm{n\ϵ}}_0-\mathrm{\β}}{n+1}+{\mathrm{\ϵ}}_p;$

(4), survey β:

Reference comparator T0 error is ε 0, then has:

β＝ε _p-ε ₀；

(5), multiplication:

Two current comparator cascades, the current ratio after the combination is the product of two comparator current ratios, i.e. nx=n0 * n1, with ε x, ε 0,, ε 1 represents then have the ratio error of three comparator TX, T0, T1 respectively:

ε _x=ε ₀+ ε ₁+ ε _pIt is characterized in that when the self-equilibrating current comparator was self-equilibrating DC current comparator, the concrete circuit method of each step was: DC current comparator self-correcting circuit

First and second loop: the L1 end of the tested comparator of H termination (Tx) of power supply, the K2 end of the tested comparator of L2 termination (Tx) of tested comparator (Tx), the current terminal of the K1 terminating resistor (Rx) of tested comparator (Tx), another current terminal ground connection of resistance (Rx) also connects the L end of power supply;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of the tested comparator of anodal termination (Tx), difference-measuring instrument electric current input negative pole end ground connection;

DC current comparator alternative route

Primary circuit: the L1 end of the H termination reference comparator (T0) of power supply, the L2 end of the tested comparator of L2 termination (Tx) of reference comparator (T0), the L end of the L1 termination power of tested comparator (Tx);

Secondary circuit: the K2 end of the tested comparator of K2 termination (Tx) of reference comparator (T0), the current terminal of the K1 terminating resistor (Rx) of tested comparator (Tx), another current terminal ground connection of resistance (Rx) and the current terminal of connecting resistance (R0), the K1 end of another electric current termination reference comparator (T0) of resistance (R0);

Potential tracking method instrument: the L2 end of the input H termination reference comparator (T0) of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the output H termination reference comparator (T0) of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator (T0), difference-measuring instrument electric current input negative pole end ground connection;

DC current comparator addition circuit:

Primary circuit: the L1 end of the H termination reference comparator (T0) of power supply, the L2 end of the tested comparator of L2 termination (Tx) of reference comparator (T0), the L end of the L1 termination power of tested comparator (Tx);

First and second loop: the K2 end of the tested comparator of K2 termination (Tx) of reference comparator (T0), the current terminal of the K1 terminating resistor (R0) of reference comparator (T0), the L2 end of another electric current termination reference comparator (T0) of resistance (R0), K1 terminating resistor (Rx) current terminal of tested comparator (Tx), another current terminal ground connection of resistance (Rx);

Potential tracking method instrument: the L2 end of the tested comparator of input H termination (Tx) of potential tracking method instrument, the input L end ground connection of potential tracking method instrument, the L1 end of the tested comparator of output H termination (Tx) of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator (T0), difference-measuring instrument electric current input negative pole end ground connection;

The DC current comparator is surveyed the β circuit:

The primary circuit: the L1 end of the tested comparator of H termination (Tx) of power supply, the L2 of tested comparator (Tx) are held ground connection and are connect the L end of power supply;

First and second loop: the K2 end of the K2 termination reference comparator (T0) of tested comparator (Tx), the current terminal of the K1 terminating resistor (Rx) of tested comparator (Tx), the L2 end of another electric current termination reference comparator (T0) of resistance (Rx), the current terminal of the K1 terminating resistor (R0) of reference comparator (T0), another current terminal ground connection of resistance (R0);

Potential tracking method instrument: the L2 end of the input H termination reference comparator (T0) of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the output H termination reference comparator (T0) of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination reference comparator (T0), difference-measuring instrument electric current input negative pole end ground connection;

DC current comparator multiplication circuit:

Primary circuit: the L1 end of the tested comparator of H termination (Tx) of power supply, the L2 end of the L2 termination reference comparator (T0) of tested comparator (Tx), the L end of the L1 termination power of reference comparator (T0);

Intermediate loop: the K2 of reference comparator (T0) holds ground connection and connects the L2 end of current comparator (T1), the current terminal of the L1 terminating resistor (R0) of current comparator (T1), the K1 end of another electric current termination reference comparator (T0) of resistance (R0);

Secondary circuit: the K2 end of the K2 termination current comparator (T1) of tested comparator (Tx), the current terminal of the K1 terminating resistor (R1) of current comparator (T1), another current terminal ground connection of resistance (R1) and the current terminal of connecting resistance (Rx), the K1 end of the tested comparator of another electric current termination (Tx) of resistance (Rx);

Potential tracking method instrument: the L2 end of the tested comparator of input H termination (Tx) of potential tracking method instrument, the input L end ground connection of potential tracking method instrument; The L1 end of the tested comparator of output H termination (Tx) of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination current comparator (T1), difference-measuring instrument electric current input negative pole end ground connection.

2. the self-alignment method of a kind of current ratio standard device according to claim 1, it is characterized in that: when described self-equilibrating current comparator is the self-equilibrating AC current comparator, as long as give difference-measuring instrument after the secondary current of self-equilibrating AC current comparator is converted into voltage, the then self-correcting of self-equilibrating DC current comparator, addition, comparison, survey β and multiplication circuit also are fit to the self-equilibrating AC current comparator fully.

3. the self-alignment method of a kind of current ratio standard device according to claim 2 is characterized in that: AC current comparator self-correcting circuit:

First and second loop: the L1 end of the tested comparator of power supply H termination (Tx), the K2 end of the tested comparator of L2 termination (Tx) of tested comparator (Tx), the current terminal of the K1 terminating resistor (Rx) of tested comparator (Tx), another current terminal ground connection of resistance (Rx) and the current terminal of connecting resistance (R0), the L end of another electric current termination power of resistance (R0);

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of the tested comparator of anodal termination (Tx), difference-measuring instrument electric current input negative pole end ground connection, the voltage input H end of the current potential output H termination difference-measuring instrument of resistance (R0); The voltage input L end of the current potential output L termination difference-measuring instrument of resistance (R0).

4. the self-alignment method of a kind of current ratio standard device according to claim 2 is characterized in that: AC current comparator multiplication circuit:

Primary circuit: the L1 end of the tested comparator of power supply H termination (Tx), the L2 end of the L2 termination reference comparator (T0) of tested comparator (Tx), the L end of the L1 termination power of reference comparator (T0).

Intermediate loop: the K2 of reference comparator (T0) holds ground connection and connects the L2 end of comparator (T1), the current terminal of the L1 terminating resistor (R0) of comparator (T1), the K1 end of another electric current termination reference comparator (T0) of resistance (R0);

Secondary circuit: the K2 end of the K2 termination comparator (T1) of tested comparator (Tx), the current terminal of the K1 terminating resistor (R1) of comparator (T1), another current terminal ground connection of resistance (R1) and the current terminal of connecting resistance (Rx), the K1 end of the tested comparator of another electric current termination (Tx) of resistance (Rx);

Potential tracking method instrument: the L2 end of the tested comparator of input H termination (Tx) of potential tracking method instrument, the input L end ground connection of potential tracking method instrument, the L1 end of the tested comparator of output H termination (Tx) of potential tracking method instrument, the output L end ground connection of potential tracking method instrument;

Difference-measuring instrument: the difference-measuring instrument electric current is imported the K2 end of anodal termination comparator (T1), difference-measuring instrument electric current input negative pole end ground connection, the voltage input H end of the current potential output H termination difference-measuring instrument of resistance (R1), the voltage input L end of the current potential output L termination difference-measuring instrument of resistance (R1).

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