The insulation resistance meter (megohmmeter) is a national mandatory calibration measuring instrument, and its calibration regulations are as follows. The main standard instruments for verification are high-voltage and high-resistance boxes and high-voltage voltmeters.
This device contains a high-voltage and high-resistance box and a DC high-voltage digital voltmeter. The upper limit of measurement of the high-voltage and high-resistance box is &, the nominal working voltage is., and the maximum working voltage is.
The device is designed with an independent leakage shielding terminal, and there is no obvious instability, short circuit or open circuit during the measurement process.
The components of this device adopt a patented rolling high-voltage switch, and the contact resistance can still meet the requirements of the calibration regulations after being used 10,000 times. It has a long technical life and mechanical life. Among them, the DC high-voltage digital voltmeter has a nominal voltage of . &
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2. Main technical parameters
Resistance output (high voltage and high resistance box) part
Accuracy level of high voltage and high resistance box And operating voltage (current)
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Adjustment range: &~
Operating environment conditions
. Reference Temperature range: ~℃&
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. Nominal operating temperature range: ~℃&
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.Reference humidity range: ~%
.Nominal operating humidity range: ~%
Variation limit: Variation caused by changes in a single influencing quantity under reference conditions
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★ It is the accuracy level of high voltage and high resistance box resistance disk.
Insulation resistance: The insulation resistance between the circuit of the high-voltage high-resistance box and any other external metal that is not electrically connected to the circuit. The resistance value measured at the nominal voltage is not less than &.
Insulation strength: The circuit between the high-voltage high-resistance box and the reference ground point for testing should be able to withstand the actual sinusoidal AC voltage with a frequency of ~ and last for a long time without breakdown or arcing.
The residual resistance at the output end of the high-voltage high-resistance box should be <.&, and its variation should be <.
Dimensions: &
Weight:
Voltage measurement (DC high-voltage digital voltmeter) part
Measuring range: ~
Resolution:
Accuracy: & (% reading & words)
Reading stability: && words
Input resistance:
Display: display the test results with digital tube
Polarity: automatically display. When measuring positive voltage, no polarity symbol is displayed. When measuring negative voltage, the &&r symbol is displayed.
Measurement speed: approx. times/second