AC/DC Peak Voltmeter

The PV2-1 digital multifunctional AC/DC peak voltmeter adopts two structural designs of standard 19-inch plug-in box and compact profile box. It has automatic AC and DC resolution, signal measurement, breakdown peak retention, high-voltage cross-line rapid protection, etc. This kind of function, the accuracy is DC 0.2/0.5 level.

This instrument adopts DSP computing core and digital signal processing technology. Through real-time signal waveform analysis and amplitude frequency calculation, it can accurately determine the breakdown point, maintain the highest voltage value at the moment of breakdown, and protect immediately. At the same time, the relay switch provides The user has a control signal and accompanied by a sound alarm system. In terms of design, advanced anti-EMC design is adopted to make this product

It can work reliably for a long time in a variety of high electric and magnetic fields. It has the leading technology among similar products at home and abroad, and has a bilingual display interface.

Table 1: LCD prompt description (in English mode)

1: Insert the voltage divider signal cable into the signal input matching interface on the rear panel of the instrument before starting up. Note that the ground potential of the signal and the chassis connection should be reliably connected to the earth.

2: After the power is turned on, press the "power" button when the instrument is turned on, and the instrument starts to work and is in the measurement state. At this time, the input terminal does not add a signal to the instrument display panel may have a certain value, this value is the interference value in the electric field, you can ignore it, once the input terminal adds a signal greater than 1V to 2V, it will enter the normal measurement mode.

3: The peak meter will automatically identify the type of input signal after starting up (the threshold voltage is not recommended to be lower than 2V), and the default state is AC mode. If the input signal is an AC signal, the default is the peak value/√2 measurement state, after pressing the «RMS value/peak value, if you press this key continuously at this time, the peak value (PEAK/√2), RMS value (RMS), True peak value (PEAK)

The three measurement functions are cyclically switched. If the input signal is a DC signal, the measurement is switched between DC peak value (PEAK) and average value (AVR). Pay special attention to the measurement range of the input signal here. It is recommended that the user choose within 20% to 80% of the input range of the instrument. If it is too small or too large, it is not conducive to the normal operation of the instrument. And may exceed the measurement accuracy.

4: After pressing the "K1/K2/Keep Pressure" button, combined with [<] to move left, [>] to move right, [+] to increase, and [-] to decrease, these 4 buttons set the AC/DC divider wind pressure Ratio and high voltage protection limit setting, K1 is the AC voltage divider ratio, K2 is the DC voltage divider ratio, OVER VOLTAGE SET is the voltage value of the high voltage protection action that needs to be set (over voltage protection mode is always on mode), after setting Press the "OK" button to indicate that the setting is complete, and the instrument will automatically save the set partial pressure ratio. If you press the "RMS/Peak" key again at this time, you will enter the measurement interface. If you want to exit without saving the settings during the setting process, press the "effective value/peak value" button to exit directly, and the set value will not be saved.

After setting the overvoltage protection limit to a certain voltage value, when the high voltage voltage measured by the peak meter exceeds this set value, the normally open terminal of the peak meter overvoltage protection relay becomes normally closed, which is provided to the user for related withdrawals. When using this port, the user should note that the relay port has a small capacity and can only be used as a trigger signal.

5: "Keep on" button, press this button cyclically. Cursor <> to switch on or off means to set the peak hold at the time of breakdown on and off, press the OK button to set the input. After entering the opening, you need to enter the opening range of the breakdown holding function. For example, after setting 10kV, the peak meter measures higher than the voltage peak and higher than 10kV. If there is a breakdown, the device can turn on the breakdown holding function. If it is lower than The set value will not be maintained if breakdown occurs. The setting range is 0～9999.99KV, and it is all set to 20kV before leaving the factory. The user can set it according to the actual use situation to avoid the high voltage signal instability or the output transformer false mutation test product breakdown.

6: In the measurement state, if there is a test product breakdown, the instrument will alarm immediately and display the voltage peak value at the moment of breakdown. This value can be checked at any time, and will be maintained until the next breakdown time is automatically covered by the new breakdown value, and only the current breakdown peak value is displayed each time. Automatically clear after shutdown. If the current measured state is the peak PERK or the effective value RMS, the value of the breakdown hold is also consistent with its state.

7: The breakdown value reappears. When a high-voltage breakdown occurs, the peak meter automatically records the last breakdown value and displays it on the screen. When the user switches to the measurement state, in any state, press the "breakdown value" button to call up The measured value held by the last breakdown.

8: In the measurement state, any key function can be called up and used at any time without affecting the normal operation of the instrument measurement.

1: The input signal cannot exceed the specified measurement range (AC 0-700V, DC 0-1000V)

2: The input signal range is best to fall between 30%-80% of the input range, too small or too large is not conducive to the measurement of the instrument

3: The applied current and voltage of the relay output interface cannot exceed the specified range (less than 250V/1A)

4: The instrument is a high-precision measuring device, please keep it and use it properly. If there is any fault, please return it to the factory for repair. Do not unpack it for repair.

Extension 1: What is the relationship between the effective value and the peak-to-peak value?

The peak-to-peak value of the sine wave is 2.828 (2√2) times the effective value.

Because the peak value of the sine wave is √2 times the effective value. The peak-to-peak value is twice the peak value, so it is 2.828 (2√2) times the effective value.

Peak-to-peak value, the difference between the highest value and the lowest value of a signal in a period, is the range between the maximum and the minimum. It describes the size of the change range of the signal value.

Application of effective values

Suppose that the sinusoidal AC current i(t) is QR in a period of time T, and the electric energy consumed by a resistor R is QR, and a corresponding DC current I also makes the resistor R consume the same electric energy during the time T, that is, QR = I2RT .

As far as the average ability to work on resistance is concerned, these two currents (i and I) are equivalent, then the value of the DC current I can represent the size of the AC current i(t), so this specific value I is called the effective value of alternating current. Both theory and experiment prove that the effective value I of sinusoidal alternating current is equal to 0.707 times its amplitude (maximum) Im.