NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Noyafa Cable Tester
How to use a high-voltage megohmmeter (insulation resistance tester) to measure the operation method of a high-voltage cable insulation resistance tester: 1. Connect the power plug of the instrument to AC220V, press the power switch to the on position, and advance the operation method of the high-voltage cable outer sheath fault tester manufacturer using the high-voltage megohmmeter (insulation resistance tester) to measure the high-voltage cable insulation resistance tester: 1. Connect the power plug of the instrument to AC220V, press the power switch to the on position, and heat it for 10 minutes in advance. The test is normal.
2. Select the appropriate test voltage (500V). 3.
Notice“test”Whether the light is off, confirm that there is no electricity on the terminal, connect the DUT, press“test”Press the button, the instrument can charge and measure the DUT. 4. After the test is over or the instrument resets automatically after the test time, press“reset”key to take out the test piece.
5. Repeat the above steps for the next measurement. 2.
Notes on use 1. It can be used after power on, but to ensure accuracy, please warm up for more than 10 minutes. 2.
When connecting the object under test, it must be in the reset state, that is, when the test light is off, to prevent high-voltage shock. 3. When the measurement value is greater than 100mΩWhen the measurement line is preferably shielded.
When wiring, connect the grounding post on the front panel of the instrument to the case or case of the DUT. 4. Try to avoid measuring too small a resistance, or shorting the two test clamps.
Earth Resistance Tester Operation Manual (I=10a,≤0.1Ω)1. The instrument comes with a pair (two sets) of test leads. The red thick wire is connected to the red current terminal, the red thin wire is connected to the red resistance terminal, the black thick wire is connected to the black current terminal, and the black thin wire is connected to the black resistance terminal.
2. Connect the power plug of the instrument to AC220V, press the power switch to the on position, and the digital tubes of each window are turned on. 3.
Turn the current adjustment knob counterclockwise to zero. 4. Select the measurement range before testing.
5. The clips of the two test leads are shorted to each other. 6.
manual testing“timing”Turn off the switch (2), after confirming that steps 2-5 are correct, press“start up”button,“test”light, adjust“current regulation”Turn the knob and observe that the current display window displays the current value to the desired current value. according to“Preset/Test”key to adjust the alarm preset potentiometer to the desired resistance value. press“reset”button to cut off the current output and put the“Current adjustment”knob to the minimum value.
Clip the test leads to the test points of the object under test. (5) Press“start”knob,“test”light on, will“Current adjustment”Adjust the knob to the desired current value, and then read the resistance value displayed in the resistance display window. When the resistance value of the measured object is greater than the preset resistance value, the instrument will issue a light alarm, otherwise it will not alarm.
just press“reset”button to stop the test,“test”The light will go out and the test leads will be removed for the next test. 8. The instrument has the function of open circuit alarm, which can detect the circuit open circuit or the test wire is not clamped in place.
Users can decide according to the actual situation. 9. The sample has an overcurrent alarm function.
When the circuit current is greater than 28a, the instrument will issue a light alarm and cut off the current output at the same time, press“reset”button to cancel the alarm function. put it again“current regulation”Turn the knob down a bit for next use. 10.
This instrument adopts the principle of voltage divider, that is, r=u/i, when the instrument is in“reset”In the state, i=0, the resistance is indeterminate, and the window displays an indeterminate state. Notes on use 1. The operator must be familiar with the operating procedures of the test instrument.
2. Do not adjust other buttons arbitrarily throughout the test. 3.
The alarm can only be issued when the test current is greater than 5A. 4. In order to ensure the stability of the test, it is recommended to use an AC regulated power supply.
5. After the test, it must be reset so that the instrument is in“reset”state before removing the test lead.
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