JP2002296137A - Pressure measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure measuring device capable of simultaneously carrying out the measurement of pressure and the measurement of DMM. SOLUTION: The pressure measuring device, which is composed of a pressure measuring section and a digital multi-meter section, employs a trigger signal input means that applies a common trigger signal to the pressure measuring section and the digital multi-meter section, and thereby a simultaneous measurement is carried out using the pressure measuring section and the digital multi- meter section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pressure measuring device,
For details, see the pressure measurement unit and digital multimeter (DM
M) (referred to as M).

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of a conventional pressure measuring device provided with a pressure measuring section and a DMM measuring section. In the figure, a microprocessor (called a CPU) 1
Performs measurement control on the pressure measurement unit 2 and the DMM measurement unit 3.

Specifically, the pressure measuring section 2 is configured to convert a measured pressure value into a frequency and output the frequency, for example, and the count gate time is set to 250 ms, for example.

[0004] The DMM measuring section 3 is configured to convert an analog measurement value into a digital signal by a ΔΣ A / D converter having a sampling period of 50 ms, for example. When the average value of the D conversion output is output as the measurement value, the measurement cycle is 300 ms.

[0005] Each of the measuring units 2 and 3 performs a predetermined measurement by changing a measurement range and the like under the control of the CPU 1. When the measurement is completed, these measurement units 2 and 3
Send the measurement result to. The CPU 1 displays the received measurement values on the display unit 4.

In such a conventional configuration, the pressure measurement unit 2 and the DMM measurement unit 3 do not have a trigger input function, and each performs measurement in a unique measurement cycle / time relationship. That is, in measurement, synchronization between the two was not established.

[0007]

When evaluating the responsiveness of, for example, an analog pressure sensor (a sensor that outputs a pressure measurement value as an analog voltage value or a current value), the simultaneousness of these pressure measurement and DMM measurement is considered. Is desirable,
There is a disadvantage that it cannot be realized with the conventional device. The present invention focuses on such a problem in the conventional pressure measuring device, and an object thereof is to provide a pressure measuring device capable of realizing the simultaneousness of the pressure measurement and the DMM measurement.

[0008]

According to a first aspect of the present invention, there is provided a pressure measuring device comprising a pressure measuring section and a digital multimeter measuring section, wherein the pressure measuring section and the digital multimeter are provided. A trigger signal input means for applying a common trigger signal to the measurement unit is provided, and synchronous measurement of the pressure measurement unit and the digital multimeter measurement unit is performed.

Here, the trigger signal input means may be constituted by a trigger signal generator, and a microprocessor for applying a trigger signal output from the trigger signal generator to the pressure measuring unit and the digital multimeter measuring unit. The trigger signal output from the trigger signal generator may be directly applied to the pressure measurement unit and the digital multimeter measurement unit. Characterized by

Thus, synchronous measurement of the pressure measurement unit and the digital multimeter measurement unit based on a common trigger signal can be realized, and highly accurate measurement can be performed.

[0011]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing an example of an embodiment of the present invention, and portions common to FIG. 4 are denoted by the same reference numerals. A trigger signal generated by a key or an electric signal is transmitted to the CPU 1 via the trigger input unit 5. The CPU 1 also provides a trigger signal to the pressure measurement unit 2 and the DMM measurement unit 3 together with a control signal, and instructs the pressure measurement unit 2 and the DMM measurement unit 3 to start measurement. The pressure measurement unit 2 and the DMM measurement unit 3 that have stopped the measurement start their respective measurements in accordance with the instruction of the trigger signal. The DMM measuring section 3 can measure at least a voltage and a current.

After the measurement, the measuring units 2 and 3
A measurement end signal is output to the CPU 1 to notify that the measurement is completed, and the measurement is stopped. The CPU 1 monitors a measurement end signal sent from each of the measuring units 2 and 3, and after finishing both measurements, takes in the measured value from each of the measuring units 2 and 3 and sends the value to the display unit 4. To display. CPU
1 stands by until the next trigger signal is input.

Next, referring to the flowchart of FIG.
The flow of the process will be described. First, when measurement is started, it waits for a trigger signal to be input (step STP
1). When the trigger signal is input, the pressure measurement unit 2 and the DMM
The measurement unit 3 performs the pressure measurement and the DMM measurement, respectively (Step STP2). In step STP3, it is determined whether the pressure measurement and the DMM measurement have been completed. When the measurement is completed, the measured value is displayed (step STP4), and the control waits for the next input of a trigger signal.

According to such a configuration, it is possible to perform a synchronous measurement between the pressure measurement based on the trigger signal and the DMM measurement, and to convert a pressure deviation into an analog electric signal and output it, such as a response characteristic of a pressure sensor or a pressure transducer. The evaluation can be performed with high accuracy.

FIG. 3 is a block diagram showing another embodiment, and portions common to FIG. 1 are denoted by the same reference numerals. In the example of FIG. 3, the trigger signal is directly input from the trigger input unit 5 to the respective measurement units 2 and 3 without passing through the CPU 1.

As described above, by directly inputting the trigger signal from the trigger input unit 5 to the respective measuring units 2 and 3 without passing through the CPU 1, the load of the trigger signal processing on the CPU 1 can be eliminated.

[0017]

As described above, according to the present invention, the DM
A pressure gauge with M measurement function is equipped with a trigger input function, and by performing DMM measurement and pressure measurement in synchronization with the input trigger signal, a pressure measurement device that can obtain the simultaneousness of pressure measurement and DMM measurement is provided. This is suitable for evaluating the responsiveness of a pressure sensor that outputs a pressure measurement value as an analog voltage value.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating the operation of FIG.

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a block diagram showing an example of a conventional pressure measuring device.

[Explanation of symbols]

 1 CPU 2 Pressure measurement unit 3 DMM measurement unit 4 Display unit 5 Trigger input unit

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Claims (3)

[Claims] 1. A pressure measuring device comprising a pressure measuring unit and a digital multimeter measuring unit, wherein a trigger signal input means for applying a common trigger signal to the pressure measuring unit and the digital multimeter measuring unit is provided. And a digital multimeter measuring unit for synchronous measurement. 2. A trigger signal input means comprising: a trigger signal generating unit; and a microprocessor for applying a trigger signal output from the trigger signal generating unit to a pressure measuring unit and a digital multimeter measuring unit. Claim 1
A pressure measuring device as described. 3. The pressure measurement device according to claim 1, wherein the trigger signal input means is configured to directly apply a trigger signal output from the trigger signal generation unit to the pressure measurement unit and the digital multimeter measurement unit. vessel.