CN2380924Y

CN2380924Y - Portable dc. voltmeter

Info

Publication number: CN2380924Y
Application number: CN 99213268
Authority: CN
Inventors: 骆乃光
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-06-17
Filing date: 1999-06-17
Publication date: 2000-05-31
Anticipated expiration: 2009-06-17

Abstract

The utility model discloses a potentiometer device, comprising a casing and a power supply device. The utility model is characterized in that the power supply device is a DC regulated circuit device which also comprises an alternating-current circuit device. The utility model not only satisfies the working condition requirement of a potentiometer, but also changes the traditional condition that only a battery is used as the power source of a potentiometer, which provides more convenience for users. The utility model is suitable for use in the production field, a measuring room, a laboratory, and all places in the external field.

Description

The Portable DC potential difference meter

The utility model relates to the measurement of DC potential difference.

The present Portable DC potential difference meter that uses, comprise Shanghai Electric Meter Factory, The Factory of Great Wall Electric Apparatus of Tianshui, the various products that Fuyang precision instrument factory is produced, for example UJ33a, UJ36a, UJ59, UJ27, UJ57, UJ61 etc. all adopt powered battery, promptly carrying out connection in series-parallel with the 1.5V dry cell is the work loop power supply, is its electronics galvanometer power supply with the 9V packed cell.Adopt powered battery to have that portable performance is good, in light weight, the characteristics of good stability, but the life-span of battery is limited, utilization factor is low, usually will upgrade battery.Exchange because custom is used, in breadboard practice, often can get a glimpse of the deficiency of its existence.

The purpose of this utility model is to propose a kind of improved Portable DC potential difference meter, and it adopts a kind of high-precision D.C. regulated power supply, utilizes city's net AC-powered.

Practice shows, by transformer, exports two or three groups of coils and constitutes that grouping is independent output, high-precision D.C. regulated power supply, can substitute battery and satisfies the application requirements of this class DC potentiometer.

Portable DC potential difference meter of the present utility model, mainly by casing, measuring work loop and galvanometer, and three groups of supply units that comprise one group of standard cell are formed, it is characterized in that said supply unit is substituted or backup by a DC-stabilized circuit device, wherein be provided with the dc output end of corresponding two or three groups of independent outputs, supply unit and measurement mechanism are contained in the same casing.

After the utility model adopts DC voltage-stablized source apparatus, make it to avoid changing battery being used for workshop, measuring room, bringing bigger convenience breadboard the time.By switching, then alternating current-direct current is at one's convenience, at this moment applicable to all occasions under the situation that keeps the primary element box.

Be illustrated below in conjunction with accompanying drawing:

Fig. 1 is the schematic diagram of existing potential difference meter.

Fig. 2 is one of the circuit theory diagrams in the straight source of voltage stabilizing, straight source.

Fig. 3 be the straight source of voltage stabilizing, straight source circuit theory diagrams two.

Fig. 4 be the straight source of voltage stabilizing, straight source circuit theory diagrams three.

Referring to accompanying drawing.By potential difference meter schematic diagram shown in Figure 1 as seen, three groups of power supplys are arranged wherein: one group is standard cell, all adopts unsaturated cell; Another group is the work ring current of 3V; One group of power supply that provides operational amplifier work again, it amplifies potential difference signal, is detected by galvanometer.Three groups of corresponding power supplys pick out and a little are A, B; C, D; E, F.Because the simple battery that uses has just brought a problem and the anxious problem that lacks of reserve battery of changing battery.If replace or additional backup with corresponding D.C. regulated power supply, just can solve the problem of above-mentioned existence.The use habit that has also adapted to some laboratory worker.

D.C. regulated power supply shown in Figure 2 only is provided with two groups of outputs, and the standard cell that is meaning potential difference meter keeps, and other two Battery pack is provided by two groups of outputs of power transformer.One group of output of its secondary 16V is through the rectification of bridge heap, the voltage stabilizing of secondary positive output three terminal regulator, C1, C2, C3, C4 are filter capacitor, R1, R2 are divider resistance, form voltage follower by a fortune dustpan amplifier OP07 at last, reduce output resistance, improve coupling, go out to be access to galvanometer from A, B termination.Another of power transformer organized the output of secondary 9V, through the rectification of bridge heap, earlier by multiterminal voltage stabilizer W723 voltage stabilizing, through the adjustable output voltage stabilizer 317 voltage stabilizings output of two series connection, goes out from C, D termination again.

DC potentiometer can be without unsaturated standard cell, and uses electronics reference source instead, and as SW199/SW299/SW399 or LM1403, latter's power consumption is lower, but will adopt independent DC power supply just can replace.Then be three tunnel independently-powered situations of full alternate form below.

Fig. 3,4 all is used for substituting or with primary element and establish supply unit diagram as backup usefulness.7809,7812,7815 are the positive output three terminal regulator among the figure; 317 is three-port variable voltage regulator; OP07 is that amplifier is made voltage follower usefulness; WB715 is the multiterminal voltage stabilizers; 9010,9110,9310 are high precision voltage stabilizing integration module.Selected device temperature is floated all smaller (10ppM/ ℃ of magnitude) many all have the overload and short-circuit protection function.And through the secondary voltage stabilizing, stability is quite high, all can reach 1/10th the basic demand that is no more than the potential difference meter error in five minutes.A, B among the figure; C, D; E, F each point respectively with Fig. 1 in the getting final product corresponding joining of DC potentiometer.

Claims

1, a kind of Portable DC potential difference meter, mainly by casing, measuring work loop and galvanometer, and three groups of supply units that comprise one group of standard cell (EN) are formed, it is characterized in that said supply unit is substituted or backup by a DC-stabilized circuit device, wherein is provided with dc output end (A, the B of corresponding two or three groups of independent outputs; C, D; E, F), supply unit and measurement mechanism are contained in the same casing.