JPH0647877U - Voltage / current generator and measuring device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] One calculation / control unit is shared by the measurement unit and the generation unit, and the measured value obtained by the measurement unit and the generated value obtained by the generation unit are calculated and the calculation result is obtained. To provide a device that can display each independently. [Measurement] Measurement comprising an analog conversion circuit 13 to which a voltage / current to be measured and a voltage drop occurring in a resistance to be measured are applied, and an analog / digital converter 14 for converting the output of this analog conversion circuit into a digital signal Part 10,
A standard voltage / current generation unit 20 including a digital / analog converter 23 for generating an analog signal according to setting data, and an output control circuit for receiving the output of the digital / analog converter and generating a standard voltage or current, Operation part 3
1, a control / calculation unit 30 and a display unit 40 having a display circuit for independently displaying the measured value obtained by the measuring unit and the value calculated by the generating unit.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a voltage / current generation and measurement device capable of generating a voltage / current and measuring resistance and the like by sharing an arithmetic / control unit composed of one microprocessor.

[0002]

[Prior art]

 A device for measuring voltage / current or resistance under the control of an arithmetic / control unit using a microprocessor is known as a digital multimeter. A device that generates a standard voltage or current under the control of the arithmetic / control unit is also known. However, in the prior art, a device for measuring a voltage / current or resistance and a device for generating a standard voltage / current sharing one arithmetic / control unit under the control of this one arithmetic / control unit. There was no device built into one enclosure.

[0003]

[Problems to be solved by the device]

 The purpose of the present invention is to share one calculation and control unit for the measurement unit and the generation unit, and to incorporate these measurement unit and generation unit in one housing, and to obtain the measurement value obtained by the measurement unit and the generation unit. An object of the present invention is to provide a device capable of calculating a generated value and a relationship between a measured value and a generated value by a calculation / control unit and independently displaying the calculation result.

[0004]

[Means for Solving the Problems]

 The present invention is a measurement that includes an analog conversion circuit to which a voltage / current to be measured and a voltage drop that occurs in a resistance to be measured are applied, and an analog / digital converter that converts the output of this analog conversion circuit into a digital signal. Section, a digital / analog converter that generates an analog signal according to the setting data, and an output control circuit that receives the output of this digital / analog converter and generates a standard voltage or current. A control / arithmetic unit that controls and calculates the measuring unit and the generating unit, and a measurement value obtained from the measuring unit based on the control of the control / arithmetic unit, and a generated value obtained from the generating unit, and The display unit is provided with a display circuit that independently displays the values obtained by calculating the relationship between the measured value and the generated value, and the measuring unit and the generating unit and the control / calculation unit are mutually connected. In addition to being insulated, the measuring unit, the generating unit, the control / calculation unit, and the display unit are housed in the same housing.

[0005]

[Action]

 In the present invention as described above, the voltage / current and resistance values are measured by the measuring unit controlled by one control / arithmetic unit arranged in the same housing, and the standard voltage / current is generated by the generating unit. The measured values in the measuring section, the generated values in the generating section, and the results of calculating the relationship between the measured values and the generated values are independently displayed on the display section.

[0006]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the device of the present invention. In the figure, 10 is a measuring unit for measuring voltage / current or resistance value (analog unit of digital multimeter), 20 is a standard voltage / current generating unit for generating voltage / current, 30 is a control calculation unit, and 40 is a control calculation unit. The display units 51 and 52 are photocouplers that connect the measurement unit 10 and the generation unit 20 to the control calculation unit 30. In the voltage / current and resistance measuring unit 10, 11a to 11d are input terminals composed of four terminals, 12a and 12b are switching switches having contacts a and b, respectively, and interlocked with each other, 13 is an input voltage divider, a voltage dividing resistor, An analog conversion circuit including a preamplifier and the like, and 14 is an analog / digital converter (hereinafter referred to as an AD converter). The input terminals 11b and 11c are connected to the input end of the analog conversion circuit 13, and the output end of the analog conversion circuit 13 is connected to the photocoupler 51 via the AD converter 14. The input terminal 11a is connected to the changeover switch 12a, and the input terminal 11d is connected to the changeover switch 12b. The analog conversion circuit 13 has constant current output terminals 13a and 13b for resistance measurement, and supplies a constant current from the terminals to the resistance Rx to be measured via the switching switches 12a and 12b. Rx is the measured resistance, which is connected between the terminals 11b and 11c. In the standard voltage / current generation unit 20, 21a and 21b are output terminals, and 22a and 22b are changeover switches having contacts a and b, respectively, and interlocking with each other. Reference numeral 23 is a digital / analog converter (hereinafter referred to as a DA converter), to which a reference voltage 23a is applied. Reference numeral 24 is a control circuit for controlling the output voltage and current, the output end of which is connected to the output terminals 21a and 21b via changeover switches 22a and 22b. The input / output terminal of the DA converter 23 is connected to the photocoupler 52 and the input terminal of the voltage / current control circuit 24. The control / arithmetic unit 30 is composed of a microprocessor that controls the entire control of the apparatus, and has an operation unit 31. The control / arithmetic unit 30 is connected to the photocouplers 51 and 52. In the display unit 40, reference numerals 41 to 43 are display circuits, the display circuit 41 displays voltage / current generated values, the display circuit 42 displays measured values of voltage / current and resistance, and the display circuit 43 generates. Displays the value that is the result of calculating the relationship between the value and the measured value. These display circuits can independently display the above-mentioned generated value, measured value, and calculated result value. The measurement unit 10, the standard voltage / current generation unit 20, the control / calculation unit 30, and the display unit 40 having the above-described configuration are arranged in the same housing.

The operation of the apparatus according to the present invention having such a configuration will be described as follows. About generation of standard voltage and current. The mode is set to the generation mode by the operation unit 31, and the changeover switches 22a and 22b are connected to the contact point b. When a desired value is set by the operation unit 31, the setting is given to the control / calculation unit 30, and the output signal of the control / calculation unit 30 is input as a setting signal to the DA converter 23 via the photocoupler 52. It The DA converter 23 uses the signal input from the control / arithmetic unit 30 as setting data, and outputs an analog signal according to the setting data. This analog signal is given to the voltage / current control circuit 24. The voltage / current control circuit 24 generates a standard voltage or current having an arbitrary value set by the operation unit 31. The generated standard voltage / current is taken out from the output terminals 21a and 21b. On the other hand, the setting data given to the DA converter 23 from the control / arithmetic unit 30 is simultaneously input to the display circuit 41 in the display unit 40, and the value thereof is displayed.

Regarding measurement of voltage / current and resistance. The operation unit 31 sets the mode to the measurement mode. In the case of voltage / current measurement, the switching switches 12a and 12b are connected to the contact b, and the measured voltage or current is applied from the terminals 11b and 11c. In this case, the constant current output obtained from the terminals 13a and 13b of the analog conversion circuit 13 based on the control of the control / arithmetic unit 30 is prohibited from being generated. The voltage or current to be measured applied from the terminals 11b and 11c is given to the AD converter 14 through the analog conversion circuit 13 and converted into digital data. The converted output is given to the control / calculation unit 30 via the photocoupler 51, and the value is displayed on the display circuit 42 in the display unit 40 under the control of the control / calculation unit. In the case of resistance measurement, the measured resistance Rx is connected to the terminals 11b and 11c. Then, under the control of the control / arithmetic unit 30, the changeover switches 12a and 12b are connected to the contact a, and a constant current is output from the terminals 13a and 13b of the analog conversion circuit 13. This constant current output is supplied to the measured resistance Rx via the changeover switches 12a and 12b, and causes a voltage drop in the measured resistance Rx. This voltage drop is taken out from the terminals 11b and 11c, and converted into digital data by the AD converter 14 via the analog converter 13. The converted output is insulated by the photocoupler 51 and given to the control / calculation unit 30, and the value is displayed on the display circuit 42 under the control of the control / calculation unit.

When the relationship between the generated value and the measured value is calculated and displayed on the third display circuit 43. For example, in the case of resistance measurement, by selectively connecting the changeover switches 12a and 12b to the contact b and the changeover switches 22a and 22b to the contact a, a constant current having an arbitrary value is generated from the generating unit 20, and the constant current is supplied to the terminal 11a. To the measured resistance Rx. The voltage drop generated in the resistance Rx to be measured is taken into the control / arithmetic unit 30 via the analog conversion circuit 13 and the AD converter 14, and the value is displayed on the display circuit 43. In this case, the value of the constant current applied from the generator 20 can be changed to an arbitrary value. Therefore, the resistance at an arbitrary current value can be measured by calculating the relationship between the applied current and the measured voltage by the control / calculation unit 30. The measurement data in that case is displayed on the display circuit 43 as described above.

[0010]

[Effect of device]

 According to the present invention, an apparatus capable of displaying a generated value and a measured value independently of each other by combining a measuring section and a voltage / current generating section by sharing a calculation / control section is obtained. You can Moreover, since the result of calculating the relationship between the generated value and the measured value can also be displayed, it is possible to obtain a device that is extremely convenient for use and is inexpensive as a whole.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention.

[Explanation of symbols]

 10 Measuring Section 13 Analog Conversion Circuit 13a, 13b Constant Current Output Terminal for Resistance Measurement 14 Analog / Digital Converter 20 Voltage / Current Generation Section 23 Digital / Analog Converter 24 Output Control Section 30 Control / Calculation Section 31 Operation Section 40 Display Section 41-43 Display circuit

Claims (1)

[Scope of utility model registration request] 1. A measurement comprising an analog conversion circuit to which a voltage / current to be measured and a voltage drop occurring in a resistance to be measured are applied, and an analog / digital converter for converting the output of the analog conversion circuit into a digital signal. Section, a digital / analog converter that generates an analog signal according to the setting data, and an output control circuit that receives the output of this digital / analog converter and generates a standard voltage or current. A control / calculation unit that controls and calculates the measurement unit and the generation unit, and a measurement value obtained from the measurement unit based on the control of the control / calculation unit, a generation value obtained from the generation unit, and The display unit is provided with a display circuit for independently displaying the result of calculating the relationship between the measured value and the generated value, and the measuring unit and the generating unit and the control / calculation unit are mutually connected. With edges, the measuring unit, generation unit, the voltage-control-calculating unit and said display unit comprising housed in the same housing
Current generator and measuring device.