JPH045018Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a digital multimeter, particularly a digital multimeter with a pulse output terminal.

Prior Art Conventionally, an independent pulse generator has been used to check and test the operation of digital circuits, such as digital-to-analog converters and counters.

Problems with the Prior Art However, there may be cases where it is desired to quickly or simply check the operation of a digital circuit, and it may not be possible to use an independent pulse generator because it is not available.

Purpose of the invention The present invention has been made by focusing on the above-mentioned problems.
The present invention aims to provide a digital multimeter with a pulse output terminal that can obtain a general pulse signal source of any frequency by frequency-dividing the clock signal of a digital multimeter for measuring current or the like.

Summary of the invention The digital multimeter with a pulse output terminal of the invention has a key input means 11 having a numeric keypad or the like.
, a numerical value setter 13 for setting an arbitrary numerical value A by operating the key input means 11, and a clock signal generator 15 for generating a time reference signal for the control operation of the digital multimeter. The device includes a frequency divider 17 that generates a pulse signal proportional to 1/A of the set value of the frequency, and a pulse output terminal 31 connected to the frequency divider 17.

Embodiment The figure is a block diagram showing an embodiment of the present invention.

In the figure, reference numeral 11 denotes a key input means, such as a keyboard, which has a numeric keypad, an erase key, etc., and is used to input arbitrary numerical values.

Reference numeral 13 denotes a numerical value setter, which supplies an arbitrary numerical value A input by key operation to the frequency divider 17, counter 27, control device 21, etc. as a set value.

A clock signal generator 15 generates time reference signals for various control operations of the digital multimeter. That is, the frequency divider 17, the input analog-to-digital converter (referred to as the input A/D converter)
19, frequency meter 25, counter 27, control device 2
1. Give an operating reference signal to the display 23, etc.

The frequency divider 17 divides the frequency of the clock signal into an arbitrary frequency pulse output, and outputs the frequency-divided signal from an external terminal 31 connected to the frequency divider 17. provide.
That is, an arbitrary numerical value A set by a key operation is used as a frequency dividing number, and a pulse signal having a frequency proportional to the value of /A, which is obtained by dividing the frequency of the clock signal, is applied to the external terminal 31.

The input A/D converter 19 selects and inputs an arbitrary input from analog inputs such as voltage, current, and resistance by operating the measurement function switch 29, and converts the analog input into a digital signal. It is converted into a value and given to the control device 21.

The frequency meter 25 counts the frequency of inputs such as voltage and current of the analog input S and provides the digital signal to the control device 21 .

The counter 27 counts the number of pulses of the analog input S input from the outside within a predetermined time,
The gate input time that determines the start, stop, etc. of the counter can be set using the numerical value setter 13 by key operation.
It is determined by the setting numerical signal from.

The control device 21 is composed of, for example, a microcomputer, and controls input measurements such as voltage and current as a digital multimeter in an integrated manner, and causes predetermined operations to be performed.

The measurement function switch 29 selects various functions of the digital multimeter and displays them for measurement. By operating the measurement function switch 29, voltage, current, resistance,
Frequency, number of pulses, etc. can be measured.

The display 23 displays the pulse frequency generated by the frequency divider 17, the input voltage, current, resistance, frequency,
Digitally displays measured values such as counts.

Effects of the invention Since the present invention has the configuration described above, it is possible to obtain pulse output of any frequency from the pulse output terminal attached to the digital multimeter without using an independent pulse generator. , Verification of operation of independent digital circuits,
In addition to being able to perform inspections, the digital multimeter itself has an input A/D converter,
Automatic correction of digital circuits such as frequency meters and counters can be easily performed.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of the present invention. 11...Key input means, 13...Numerical setting device,
15... Clock signal generator, 17... Frequency divider,
27...Counter, 31...Pulse signal terminal.

Claims (1)

[Scope of utility model registration request] A key input means having a numeric keypad or the like, a numerical value setter for setting an arbitrary value by operating the key input means, a clock signal generator for generating a time reference signal for control operation of the digital multimeter, and a clock signal generator for generating a time reference signal for control operation of the digital multimeter. In a digital multimeter equipped with a counter that counts the number of signals input from the outside,
A digital multimeter with a pulse output terminal, comprising a frequency divider that generates a pulse signal proportional to 1/1 of a set numerical value of a clock signal frequency, and a pulse output terminal connected to the frequency divider.