CN218298503U - Wide capacitance standard loss box - Google Patents
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- CN218298503U CN218298503U CN202222684099.4U CN202222684099U CN218298503U CN 218298503 U CN218298503 U CN 218298503U CN 202222684099 U CN202222684099 U CN 202222684099U CN 218298503 U CN218298503 U CN 218298503U
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Abstract
A wide-capacitance standard loss box comprises a box body, a change-over switch, a loss value selection switch, a standard loss box output interface and a material object capacitor, wherein the standard loss box output interface is arranged on the outer side of the box body, and the change-over switch is electrically connected with the standard loss box output interface; the conversion switch is used for switching the connection between the output interface of the standard loss box and the measuring circuits, the number of the measuring circuits is n, and n is not less than 2 and is an integer; each of the measuring circuits includes a real object capacitor and a plurality of variable resistors connected in series. The utility model discloses a through setting up the measuring circuit of multiunit, under same frequency point, the standard loss value that corresponds a plurality of electric capacities is exported, makes the scope of standard loss case output wider, has expanded the transmission quantity value scope of dielectric loss parameter; the utility model discloses a set up open circuit compensation function, short circuit compensation function and realize more accurate test.
Description
Technical Field
The utility model relates to a measurement or calibration field, in particular to standard measuring tool of transmission medium loss parameter (the secondary parameter of electric capacity).
Background
In the field of measurement or calibration, a standard loss box (standard loss device) is a measuring instrument specially made for ensuring the consistency of unit quantity value transmission of a dielectric loss parameter (a secondary parameter of a capacitor), and is used as a standard measuring tool for transmitting the dielectric loss parameter in alternating current parameter measurement.
Meanwhile, in the field of electronic components, a capacitor is one of main basic electronic elements, and the dielectric loss parameter of the capacitor is an important index for measuring the quality of the capacitor. The dielectric loss parameters of the capacitor can be measured by instruments such as: the capacitance bridge, the LCR digital bridge, the dielectric loss measuring instrument and the like are used for measuring whether the dielectric loss test is accurate or not, and the judgment needs to be carried out through a standard loss box (standard loss device).
In the dielectric loss parameter measurement industry at present, the name of a dielectric loss box produced in China is generally a decimal standard capacitance loss box or a capacitance loss factor box, and the dielectric loss box is characterized in that in the same loss box, 1 frequency point can only correspond to a fixed capacitance value, such as: 100Hz (1. Mu.F), 1kHz (0.1. Mu.F), 10kHz (0.01. Mu.F), the loss values of the output are: (1-10) × (10 -1 Gear 10 -2 Gear 10 -3 Gear 10 -4 Gear).
Because only can output the loss value that a specific capacitance value corresponds when 1 frequency point, have certain limitation, along with the progress and the development of scientific and technological, 100Hz frequency point can only detect the dielectric loss that 1 mu F capacitance value corresponds, can not satisfy the requirement, still need detect other capacitance values simultaneously, if: dielectric losses corresponding to "10nF, 100 nF. Similarly, at a frequency point of 1kHz, besides detecting the dielectric loss corresponding to the capacitance of 100nF, it needs to detect at the same time, for example: the dielectric loss corresponding to the capacitance values of 1nF and 10nF, and the frequency of 10kHz, in addition to detecting the dielectric loss corresponding to the capacitance value of 10nF, the dielectric loss corresponding to the capacitance values of 100pF and 1nF needs to be detected at the same time.
Disclosure of Invention
An object of the utility model is to overcome the above-mentioned not enough that exist among the prior art, provide a wide capacitance standard loss case.
In order to realize the purpose of the utility model, the utility model provides a following technical scheme:
a wide-capacitance standard loss box comprises a box body, a change-over switch, a loss value selection switch, a standard loss box output interface and a material object capacitor, wherein the standard loss box output interface is arranged on the outer side of the box body, and the change-over switch is electrically connected with the standard loss box output interface;
the transfer switch is used for switching the connection between the output interfaces of the standard loss boxes and the measuring circuits, the number of the measuring circuits is n, n is more than or equal to 2, and the n is an integer; each measuring circuit comprises a real object capacitor and a plurality of variable resistors which are connected in series;
the loss value selection switch can switch the variable resistor switching resistance value in each measuring circuit; switching different resistance values according to the loss value selection switch to enable the wide capacitance standard loss box to output different loss values;
and the real object capacitor and the variable resistors in each measuring circuit are matched to output loss values with different magnitudes under the same frequency.
Further, the number of the loss value selection switches is the same as the number of the variable resistors in one measuring circuit, and the loss value selection switches are rotary switches, and the rotation of the rotary switches can simultaneously switch the switching resistance values of the variable resistors at corresponding positions in each measuring circuit.
Further, each real capacitor corresponding to the wide-capacitance standard loss box has different capacitance values.
Further, each real capacitor corresponds to m groups of standard loss values, wherein m is equal to the number of variable resistors in one measuring circuit, and each group corresponds to 10 standard loss values; the physical capacitor is preferably a low dielectric loss capacitor and is enclosed in a metal case having a shielding function.
Further, each loss value selection switch can selectively output 10 standard loss values, and the selected standard loss values are output through the standard loss box output interface.
Further, the wide capacitance standard loss box is at a frequency point of 100 Hz: the number of the real capacitors is 3, the real capacitors respectively correspond to capacitances of 10nF, 100nF and 1 muF, each capacitance corresponds to 4 groups of standard loss values, and each group can output 10 loss values, which are respectively: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from each of four groups of loss values, so that different loss values are output in a combined mode;
the wide capacitance standard loss box is at a frequency point of 1000 Hz: the number of the real capacitors is 3, the real capacitors respectively correspond to capacitances 1nF, 10nF and 100nF, each capacitance correspondingly outputs 4 groups of standard loss values, and each group can output 10 loss values, which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 Gear, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from each of four groups of loss values, so that different loss values are output in a combined mode;
the wide capacitance standard loss box is at a frequency point of 10 kHz: the number of the real capacitors is 3, the real capacitors respectively correspond to capacitance values of 100pF, 1nF and 10nF, each capacitance value correspondingly outputs 4 groups of standard loss values, and each group can output 10 loss values which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Gear, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from four groups of loss values, so that different loss values are output in a combined mode.
Further, the wide capacitance standard loss box can also work at one of the frequencies of 50Hz, 100kHz and 1 MHz.
Furthermore, the change-over switch is also provided with an open circuit compensation function, a short circuit compensation function and a reset function; the open circuit compensation function can reduce or eliminate stray capacitance, and the short circuit compensation function can reduce or eliminate residual resistance and inductance; the change-over switch is provided with an open circuit key, a short circuit key and a reset key, and the open circuit key, the short circuit key and the reset key sequentially and correspondingly select an open circuit compensation function, a short circuit compensation function and a reset function.
Further, the change-over switch is a rotary switch.
The input device is in communication connection with the central processing unit, and is used for inputting a standard loss value required to be output and transmitting the standard loss value to the central processing unit;
the central processing unit is electrically connected with the change-over switch and the loss value selection switch, and is used for controlling the change-over switch and the loss value selection switch and controlling the opening and closing of an open-circuit compensation function (KO), a short-circuit compensation function (KS) and a reset function (KF).
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a through setting up the measuring circuit of multiunit, under same frequency point, the standard loss value that corresponds a plurality of electric capacities is exported, makes the scope of standard loss case output wider, has expanded the transmission quantity value scope of dielectric loss parameter;
2. the utility model discloses a set up open circuit compensation function, short circuit compensation function and reset function at change over switch, convenient to use more also can realize more accurate test.
Drawings
Fig. 1 is a schematic structural diagram of a passive wide capacitance standard loss box of the present invention;
fig. 2 is a schematic structural diagram of the active wide capacitance standard loss box of the present invention;
fig. 3 is a schematic diagram of a passive circuit according to the present invention;
fig. 4 is a schematic diagram of an active circuit of the present invention;
fig. 5 is a schematic diagram of the loss value selecting switch of the present invention.
The labels in the figure are: 1-a box body; 2-a transfer switch; 3-loss value selection switch; 4-standard loss box output interface.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. However, it should not be understood that the scope of the above-mentioned subject matter is limited to the following embodiments, and all the technologies realized based on the present invention are within the scope of the present invention.
Example 1
Referring to fig. 1 to 3 together, as shown in the drawings, in the present embodiment, the present invention includes a box body 1, a transfer switch 2, a loss value selection switch 3, a standard loss box output interface 4 and a real object capacitor, where the standard loss box output interface 4 is disposed outside the box body 1, and the transfer switch 2 is electrically connected to the standard loss box output interface 4;
the change-over switch 2 is used for switching the connection between the standard loss box output interface 4 and the measuring circuits, and the number of the measuring circuits is 2; each of the measuring circuits includes a real capacitor and 3 variable resistors connected in series;
the loss value selection switch 3 can switch the variable resistor switching resistance value in each measuring circuit; the different resistance values are switched by the loss value selection switch 3, so that the wide capacitance standard loss box outputs different loss values;
and the real object capacitor and the 3 variable resistors in each measuring circuit are matched to output loss values with different magnitudes under the same frequency.
Example 2
Referring to fig. 1 and 3 together, the present embodiment is a passive wide capacitance standard loss box; in the embodiment, the power supply comprises a box body 1, a change-over switch 2, a loss value selection switch 3, a standard loss box output interface 4 and a material object capacitor, wherein the standard loss box output interface 4 is arranged on the outer side of the box body 1, and the change-over switch 2 is electrically connected with the standard loss box output interface 4;
the change-over switch 2 is used for switching the connection between the standard loss box output interface 4 and the measuring circuits, and the number of the measuring circuits is 2; each of the measuring circuits includes a real capacitor and 3 variable resistors connected in series;
the loss value selection switch 3 can switch the variable resistor switching resistance value in each measuring circuit; switching different resistance values according to the loss value selection switch 3 to enable the wide-capacitance standard loss box to output different loss values;
and the real object capacitor and the variable resistors in each measuring circuit are matched to output loss values with different magnitudes under the same frequency.
The number of the loss value selection switches 3 is 3, and the loss value selection switches 3 are rotary switches, and the rotation of the rotary switches can simultaneously switch the variable resistor switching resistance values at corresponding positions in each measuring circuit.
And the physical capacitors corresponding to the wide-capacitance standard loss boxes have different capacitance values.
Each real capacitor corresponds to 3 groups of standard loss values, and each group corresponds to 10 standard loss values; the physical capacitor is preferably a low dielectric loss capacitor and is enclosed in a metal case having a shielding function.
Each loss value selection switch 3 can selectively output 10 standard loss values, and the selected standard loss values are output through the standard loss box output interface 4.
The wide capacitance standard loss box is at a frequency point of 100 Hz: the number of the real capacitors is 2, the real capacitors respectively correspond to capacitance values of 10nF and 100nF, each capacitance value corresponds to 3 groups of standard loss values, and each group can output 10 loss values which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from 3 groups of loss values, so that different loss values are output in a combined mode;
the wide capacitance standard loss box is at a frequency point of 1000 Hz: the number of the real capacitors is 2, the real capacitors respectively correspond to capacitance values of 1nF and 10nF, each capacitance value corresponds to output 3 groups of standard loss values, and each group is provided with10 loss values can be output, which are respectively: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from each of 3 groups of loss values, so that different loss values are output in a combined mode;
the wide capacitance standard loss box is at a frequency point of 10 kHz: the number of the object capacitors is 2, the object capacitors respectively correspond to capacitance values of 100pF and 1nF, each capacitance value correspondingly outputs 3 groups of standard loss values, and each group can output 10 loss values, which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from 3 groups of loss values, so that different loss values can be output in a combined mode.
The wide capacitance standard loss box can also work under one of the frequencies of 50Hz, 100kHz and 1 MHz.
The change-over switch 2 is also provided with an open circuit compensation function, a short circuit compensation function and a reset function; the open circuit compensation function can reduce or eliminate stray capacitance, and the short circuit compensation function can reduce or eliminate residual resistance and inductance; preferably, the reset function is to restore the instrument to the initial setting state after completing the work, and the reset function is set to make the measurement operation more convenient; the change-over switch 2 is provided with an open-circuit key, a short-circuit key and a reset key, and the open-circuit key, the short-circuit key and the reset key sequentially and correspondingly select an open-circuit compensation function, a short-circuit compensation function and a reset function.
The change-over switch 2 is a rotary switch.
Example 3
Referring to fig. 1, fig. 3 and fig. 5 together, the passive wide capacitance standard loss box of the present embodiment is shown; in the embodiment, the device comprises a box body 1, a change-over switch 2, a loss value selection switch 3, a standard loss box output interface 4 and a real object capacitor, wherein the standard loss box output interface 4 is arranged on the outer side of the box body 1, and the change-over switch 2 is connected with the standard loss box output interface 4;
the change-over switch 2 is used for switching the connection between the standard loss box output interface 4 and the measuring circuits, and the number of the measuring circuits is 3; the 3 measuring circuits comprise a real object capacitor and 4 variable resistors which are connected in series;
the loss value selection switch 3 can switch the variable resistor switching resistance value in each measuring circuit; switching different resistance values according to the loss value selection switch 3 to enable the wide-capacitance standard loss box to output different loss values;
and the material object capacitor and the variable resistors in each measuring circuit are matched to output loss values with different magnitudes under the same frequency.
The number of the loss value selection switches 3 is 4, and the loss value selection switches 3 are rotary switches, and the rotation of the rotary switches can simultaneously switch the variable resistor switching resistance values at corresponding positions in each measuring circuit.
And the physical capacitors corresponding to the wide-capacitance standard loss boxes have different capacitance values.
Each real capacitor corresponds to 4 groups of standard loss values, and each group corresponds to 10 standard loss values; the physical capacitor is preferably a low dielectric loss capacitor and is enclosed in a metal case with a shielding function.
Each loss value selection switch 3 can selectively output 10 standard loss values, and the selected standard loss values are output through the standard loss box output interface 4.
The wide capacitance standard loss box is at a frequency point of 100 Hz: the number of the object capacitors is 3, the object capacitors correspond to capacitances of 10nF, 100nF and 1 muF respectively, each capacitance corresponds to 4 groups of standard loss values, and each group can output 10 loss values which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from each of four groups of loss values, so that different loss values are output in a combined mode;
the wide capacitance standard loss box is at a 1000Hz frequency point: the described material objectThe number of the capacitors is 3, which respectively corresponds to capacitances 1nF, 10nF and 100nF, each capacitance correspondingly outputs 4 groups of standard loss values, and each group can output 10 loss values, which respectively are as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from each of four groups of loss values, so that different loss values are output in a combined mode;
the wide capacitance standard loss box is at a frequency point of 10 kHz: the number of the object capacitors is 3, the object capacitors respectively correspond to capacitance values of 100pF, 1nF and 10nF, each capacitance value correspondingly outputs 4 groups of standard loss values, and each group can output 10 loss values which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Gear, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from four groups of loss values, so that different loss values are output in a combined mode.
The wide capacitance standard loss box can also work under one of the frequencies of 50Hz, 100kHz and 1 MHz.
The change-over switch 2 is also provided with an open circuit compensation function, a short circuit compensation function and a reset function; the open circuit compensation function can reduce or eliminate stray capacitance, and the short circuit compensation function can reduce or eliminate residual resistance and inductance; preferably, the reset function is to restore the instrument to the initial setting state after completing the work, and the reset function is set to make the measurement operation more convenient; the change-over switch 2 is provided with an open circuit key, a short circuit key and a reset key, and the open circuit key, the short circuit key and the reset key sequentially and correspondingly select an open circuit compensation function, a short circuit compensation function and a reset function.
The change-over switch 2 is a rotary switch.
Although the actual capacitors and the variable resistors corresponding to the K1 switch, the K2 switch, and the K3 switch of the change-over switch 2 in fig. 3 are different, the operating principles thereof are the same. Now, taking the K1 switch as an example, the K1 switch and the corresponding real capacitor, variable resistor andthe loss value output operation principle corresponding to the loss value selection switch 3, R in fig. 5 1 1 ～R 1 10 、R 2 1 ～R 2 10 、R 3 1 ～R 3 10 、R 4 1 ～R 4 10 Respectively correspond to R of FIG. 3 1 、R 2 、R 3 、R 4 When the loss value required to be output is 0.026, the K1 switch is closed through the change-over switch 2, the rest switches in the change-over switch 2 are opened, and K is enabled through the loss value selection switch 3 1-1 (10 -1 Gear), K 12 (10 -2 Gear), K 26 (10 -3 Gear), K 1-4 (10 -4 Gear) is closed, and the other switches are opened, so that the output of the required loss value is realized.
Example 4
Referring to fig. 2, 4 and 5, the present embodiment is an active wide capacitance standard loss box; in the embodiment, the device comprises a box body 1, a change-over switch 2, a loss value selection switch 3, a standard loss box output interface 4 and a real object capacitor, wherein the standard loss box output interface 4 is arranged on the outer side of the box body 1, and the change-over switch 2 is electrically connected with the standard loss box output interface 4;
the change-over switch 2 is used for switching the connection between the standard loss box output interface 4 and the measuring circuits, and the number of the measuring circuits is 3; each of the measuring circuits includes a real capacitor and 4 variable resistors connected in series;
the change-over switch 2 is also provided with an open circuit compensation function, a short circuit compensation function and a reset function; the open circuit compensation function can reduce or eliminate stray capacitance, and the short circuit compensation function can reduce or eliminate residual resistance and inductance; preferably, the reset function is to restore the instrument to the initial setting state after completing the work, and the reset function is set to make the measurement operation more convenient; the change-over switch 2 is provided with an open circuit key, a short circuit key and a reset key, and the open circuit key, the short circuit key and the reset key sequentially and correspondingly select an open circuit compensation function, a short circuit compensation function and a reset function.
The loss value selection switch 3 can switch the variable resistor switching resistance value in each measuring circuit; switching different resistance values according to the loss value selection switch 3 to enable the wide-capacitance standard loss box to output different loss values;
and the real object capacitor and the 4 variable resistors in each measuring circuit are matched to output loss values with different magnitudes under the same frequency.
The wide capacitance standard loss box is 100Hz frequency, the number of the real capacitors is 3, the real capacitors respectively correspond to capacitances of 10nF, 100nF and 1 muF, each capacitance corresponds to 4 groups of standard loss values, each group can output 10 loss values, and the loss values are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from four groups of loss values, so that different loss values are output in a combined mode.
Also comprises a central processing unit and an input device,
the input device is in communication connection with the central processing unit and is used for inputting a standard loss value required to be output and transmitting the standard loss value to the central processing unit;
the central processing unit is electrically connected with the change-over switch 2 and the loss value selection switch 3, and is used for controlling the switching of the change-over switch 2 and the loss value selection switch 3 and controlling the opening and closing of an open circuit compensation function (KO), a short circuit compensation function (KS) and a reset function (KF).
Although the K1 switch, the K2 switch, and the K3 switch in the change-over switch 2 in fig. 4 are different from the corresponding real capacitor and variable resistor, the operation principles thereof are the same, now taking the K1 switch as an example, the loss value output operation principles corresponding to the K1 switch, the corresponding real capacitor, variable resistor, and loss value selection switch 3 are listed in the form of fig. 5, and R in fig. 5 1 1 ～R 1 10 、R 2 1 ～R 2 10 、R 3 1 ～R 3 10 、R 4 1 ～R 4 10 Respectively correspond to R in FIG. 4 1 、R 2 、R 3 、R 4 ；
Selecting a singlechip or a programming controller as a central processing unit, and selecting a touch display screen or a key touch switch as an input device; the CPU outputs commands to control the opening and closing of relays or reed switches (KO, KS, KF, K1, K2, K3) of the change-over switch 2 section and to control relays or reed switches (R) of the loss value selection switch 3 section 1 ～R 4 、R 1 / ～R 4 / 、R 1 // ～R 4 // ) Open and close; before testing, an open-circuit compensation function (KO) and a short-circuit compensation function (KS) are respectively selected by operating the input device, open-circuit compensation and short-circuit compensation are carried out on an instrument needing to be detected, when a loss value needing to be output is 0.2, a central processing unit is enabled to close a K1 switch through operation of the input device, and the rest of switches connected with a change-over switch 2 are disconnected, and K is further enabled to be connected 02 (10 -1 Gear), K 1-2 (10 -2 Gear), K 1-3 (10 -3 Gear), K 1-4 (10 -4 Gear) is closed, and the rest switches in the K1 switch are opened; the output of the required loss value is realized, and after the test is completed, the operation input device selects a reset function (KF) to reset, so that the test device is convenient to use and can improve the test accuracy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (10)
1. A wide-capacitance standard loss box comprises a box body (1), a change-over switch (2), a loss value selection switch (3), a standard loss box output interface (4) and a real object capacitor, wherein the standard loss box output interface (4) is arranged on the outer side of the box body (1), and the change-over switch (2) is electrically connected with the standard loss box output interface (4); it is characterized in that the preparation method is characterized in that,
the transfer switch (2) is used for switching the connection between the standard loss box output interface (4) and the measuring circuits, the number of the measuring circuits is n, n is more than or equal to 2, and the n is an integer; each measuring circuit comprises a real object capacitor and a plurality of variable resistors which are connected in series;
the loss value selection switch (3) can switch the variable resistor switching resistance value in each measuring circuit;
and the material object capacitor and the variable resistors in each measuring circuit are matched to output loss values with different magnitudes under the same frequency.
2. A wide capacitance standard loss box according to claim 1, wherein the number of said loss value selection switches (3) is the same as the number of said variable resistors in one of said measuring circuits, and said loss value selection switches (3) are rotary switches, the rotation of which can simultaneously switch the switching resistance values of said variable resistors at corresponding positions in each of said measuring circuits.
3. The wide capacitance standard loss box according to claim 2, wherein each physical capacitor of the wide capacitance standard loss box has different capacitance value.
4. The wide capacitance standard loss tank of claim 2, wherein each physical capacitor corresponds to m sets of standard loss values, wherein m is equal to the number of variable resistors in one of the measurement circuits, and wherein each set corresponds to 10 standard loss values.
5. A wide capacitance standard loss box according to claim 4, wherein each loss value selection switch (3) is capable of selectively outputting 10 standard loss values, and the selected standard loss values are output through the standard loss box output interface (4).
6. A wide capacitance standard loss box as defined in claim 5,
the wide capacitance standard loss box is at a frequency point of 100 Hz: the number of the real capacitors is 3, the real capacitors respectively correspond to capacitances of 10nF, 100nF and 1 muF, each capacitance corresponds to 4 groups of standard loss values, and each group can output 10 loss values, which are respectively: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from each of four groups of loss values, so that different loss values are output in a combined manner;
the wide capacitance standard loss box is at a frequency point of 1000 Hz: the number of the object capacitors is 3, the object capacitors correspond to capacitances 1nF, 10nF and 100nF respectively, each capacitance corresponds to and outputs 4 groups of standard loss values, and each group can output 10 loss values which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Grade, (1-10) x 10 -3 Grade, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from each of four groups of loss values, so that different loss values are output in a combined mode;
the wide capacitance standard loss box is at a frequency point of 10 kHz: the number of the real capacitors is 3, the real capacitors respectively correspond to capacitance values of 100pF, 1nF and 10nF, each capacitance value correspondingly outputs 4 groups of standard loss values, and each group can output 10 loss values which are respectively as follows: (1-10). Times.10 -1 Grade, (1-10) x 10 -2 Gear, (1-10) x 10 -3 Gear, (1-10) x 10 -4 1-10 are integers; when the wide capacitance standard loss box works, one value can be selected from four groups of loss values, so that different loss values are output in a combined mode.
7. The wide capacitance standard loss box of claim 1, further operable at one of 50Hz, 100kHz, and 1 MHz.
8. The wide capacitance standard loss box according to claim 2, wherein the transfer switch (2) is further provided with an open compensation function, a short compensation function and a reset function, the transfer switch (2) is provided with an open key, a short key and a reset key, and the open key, the short key and the reset key correspond to the open compensation function, the short compensation function and the reset function in sequence.
9. A wide capacitance standard loss box according to claim 7, wherein the change-over switch (2) is a rotary switch.
10. The wide capacitance standard loss box of claim 1, further comprising a central processing unit and an input device,
the input device is in communication connection with the central processing unit and is used for inputting a standard loss value required to be output and transmitting the standard loss value to the central processing unit;
the central processing unit is electrically connected with the change-over switch (2) and the loss value selection switch (3), and is used for controlling the switching of the change-over switch (2) and the loss value selection switch (3) and controlling the opening and closing of an open circuit compensation function (KO), a short circuit compensation function (KS) and a reset function (KF).
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