JPH08170974A - Period and average current measuring instrument - Google Patents

Abstract

PURPOSE: To provide a period and average current measuring instrument for simply and accurately measure the average current in the operation period of an object to be measured. CONSTITUTION: The number of reference pulses from a reference pulse generation means 4 is counted by a first counting means 5 according to a pulse signal in response to an operation voltage from an object 2 to be measured from a first pulse signal generating means 3. The pulse signal of a frequency corresponding to the operation current of the object 2 to be measured from a second pulse signal generation means consisting of a current-voltage conversion circuit 6 and a voltage-frequency converter 7 is counted by a second counting means 8. The operation period and average current of the object 2 to be measured is detected based on each count result of the first counting means 5 and the second counting means 8 by an operation means 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a period and average current measuring device for measuring the rate and average current of a timepiece.

[0002]

2. Description of the Related Art For example, when a quality inspection of a timepiece is performed, a rate is measured by a day difference meter, and a consumption current of a step motor for hand movement is measured by an average ammeter for an average current in several step cycles. . Thus, the rate and the average current are
The measurement was performed using different devices.

[0003]

If the rate and the average current are measured by using different devices as in the prior art, the measuring time becomes longer and two measuring devices are required. Therefore, the cost was increased accordingly.

Further, depending on the timepiece, the stepping cycle of the hand movement step motor may be different, and in that case, the measurement cycle of the average ammeter must be changed each time.

An object of the present invention is to provide a period and average current measuring device capable of simultaneously and easily measuring the period and average current of an object to be measured.

[0006]

According to the present invention, there is provided a first pulse signal generating means for generating a pulse signal according to a voltage change due to an operation of an object to be measured which operates intermittently such as a timepiece, and a pulse having a reference frequency. Reference pulse generating means for generating a signal,
First counting means for counting the reference pulses from the reference pulse generating means in response to the pulse signal from the first pulse signal generating means, and the measured object based on the counting result of the first counting means. Cycle detecting means for detecting an operation cycle of the object; second pulse signal generating means for generating a pulse signal having a frequency according to the operation current of the object to be measured;
A second pulse for counting the pulses from the second pulse signal generating means according to the pulse signal from the pulse signal generating means
The above problem is solved by providing the counting means and the average current detecting means for detecting the average current of the object to be measured based on the counting result of the second counting means.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a DC power supply circuit, which has a current limiting resistor 1a for preventing an overcurrent in order to stabilize the output voltage thereof to, for example, 3 volts. Reference numeral 2 denotes an object to be measured which operates intermittently, for example, a step motor drive circuit of a timepiece, which generates a drive pulse every one second. The power supply terminal on the high voltage side of the DUT 2 is connected to the DC power supply circuit 1
The low-voltage side power supply terminal is connected to
It is connected to the voltage conversion means 6. Reference numeral 3 is a first pulse signal generating means for generating a pulse signal according to the voltage change across the current limiting resistor 1a due to the operation of the device under test 2, and 4 is a reference frequency for measuring the operating cycle of the device under test 2. Of the reference pulse generating means 5 for generating the pulse signal of the first pulse signal generating means 3 and the first pulse counting means 6 for counting the reference pulse from the reference pulse generating means 4 in response to the pulse signal from the first pulse signal generating means 3. A current-voltage conversion circuit for converting a current generated by the operation of the object to be measured 2 into a voltage, 7 is a current-voltage conversion circuit 6
Is a voltage-frequency converter that generates a pulse signal having a frequency corresponding to the output voltage of the. The current-voltage conversion circuit 6 and the voltage-frequency converter 7 constitute a second pulse signal generating means. Reference numeral 8 is second counting means for counting the pulses from the voltage-frequency converter 7 according to the pulse signal from the first pulse signal generating means 3, and 9 is the first counting means 5 and the second counting means 8 And a calculation means for calculating the operation cycle and the average current of the DUT 2 based on the respective counting results of
Reference numeral 0 is a keyboard for controlling the arithmetic processing of the arithmetic means 9, and 11 is a display means for displaying the arithmetic result by the arithmetic means 9.

Next, the operation cycle of the device under test 2 and the operation of calculating the average current will be described with reference to the flowchart of FIG.

When the high voltage side power supply terminal of the DUT 2 is connected to the terminal A of the DC power supply circuit 1 and the low voltage side power supply terminal is connected to the terminal B of the current-voltage conversion circuit 6, the DUT 2 is measured. Is supplied to the device under test 2, and the drive pulse of the step motor is generated from the DUT 2 at a cycle of 1 second. The voltage across the current limiting resistor 1a changes according to the operation of the DUT 2. In response to this voltage change, the first pulse signal generating means 3
As shown in FIG. 3A, a pulse signal having a cycle of 1 second is generated.

Further, as shown in FIG. 3B, a current corresponding to the driving current of the step motor is generated at the terminal B. The current-voltage conversion circuit 6 generates a voltage signal according to the current change at the terminal B, as shown in FIG. As shown in FIG. 3D, the voltage-frequency converter 7 generates a pulse signal having a frequency corresponding to the voltage signal from the current-voltage conversion circuit 6. The frequency of this pulse signal has a value proportional to the drive current of the step motor.

The first counting means 5 is reset and started by the rise of the pulse signal from the first pulse signal generating means 3 (step A). As a result, the first counting means 5 starts counting the pulses of the reference frequency from the reference pulse generating means 4 shown in FIG.

The second counting means 8 is reset and started at the same timing as the first counting means 5 by the rise of the pulse signal from the first pulse signal generating means 3 (step B). Thereby, the second counting means 8 starts counting the pulses from the voltage-frequency converter 7.

Next, the first counting means 5 and the second counting means 8 stop counting by the next rise of the pulse signal from the first pulse signal generating means 3 (step C).

Next, the calculation means 9 is composed of the first counting means 5
Of the counting period, that is, the period of the step motor drive pulse, and the counting result of the second counting means 8, that is, the voltage counted in the counting period. Based on the number of pulses from the frequency converter 7, the average value of the current consumed by the step motor during the counting period is calculated.

In this way, the time of one cycle from the rise of the pulse signal from the first pulse signal generating means 3 to the next rise and the average current consumption of the step motor in the one cycle are calculated.

The calculating means 9 performs the series of operations described above for the period designated by the keyboard 10 and calculates the average value of these data (step D). The calculation result is displayed on the display unit 11.

As described above, the period and the average current of the DUT 2 can be measured at one time, and the average current can be detected as follows.
Since the pulse signal corresponding to the operation cycle of the DUT 2 generated from the first pulse generating means 3 is used, the DUT of any cycle can be measured. Therefore, it is possible to eliminate the trouble of manually switching the measurement cycle of the average ammeter according to the operation cycle of the DUT 2 as in the related art, and it is possible to easily measure the cycle and the average current of the DUT.

In the above example, the timepiece is used as the DUT 2, but the DUT is not limited to this, and a torsion pendulum, an electronic metronome, or the like may be used.

Further, in the above example, the operation cycle and the current consumption are measured every one cycle, but this is not limited to one cycle, and it is possible to appropriately change it to two cycles or three cycles. In this case, it is necessary to set the reset timing of the first counting means 5 and the second counting means 8 appropriately in accordance with it.

[0021]

According to the present invention, the operation cycle of an object to be measured, such as a timepiece, which operates intermittently, is measured, and at the same time, the average current is measured based on the cyclic signal. It is possible to easily and accurately measure the average current in the operation cycle of an object. Therefore, it is possible to eliminate the trouble of manually switching the measurement cycle of the average ammeter according to the operation cycle of the object to be measured, and it is possible to easily measure the cycle and the average current of the object to be measured.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of a device of the present invention.

FIG. 2 is a flowchart for explaining the operation of the device of the present invention.

FIG. 3 is a waveform diagram for explaining the operation of the device of the present invention.

[Explanation of symbols]

 3 1st pulse signal generation means 4 Reference signal generation means 5 1st counting means 6 Current-voltage conversion circuit 7 Voltage-frequency converter 8 2nd counting means 9 Arithmetic means

Claims (1)

[Claims] 1. A first pulse signal generating means for generating a pulse signal according to a voltage change due to an operation of an object to be measured which operates intermittently such as a clock, and a reference pulse generating means for generating a pulse signal of a reference frequency. And first counting means for counting the reference pulses from the reference pulse generating means in response to the pulse signal from the first pulse signal generating means, and based on the counting result of the first counting means, The cycle detecting means for detecting the operation cycle of the object to be measured, the second pulse signal generating means for generating a pulse signal having a frequency corresponding to the operating current of the object to be measured, and the first pulse signal generating means. Second counting means for counting the pulses from the second pulse signal generating means according to the pulse signal, and an average for detecting the average current of the measured object based on the counting result of the second counting means. An apparatus for measuring period and average current, comprising: current detection means.