Year1
The insulation resistance meter (megohmmeter) is a national mandatory calibration measuring instrument and its calibration regulations are -. 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 the measurement of the high-voltage and high-resistance box is the nominal working voltage. The maximum working voltage is.
The device is designed with an independent leakage shielding terminal, so there is no obvious instability, short circuit or open circuit during the measurement process.
The components of this device adopt the 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 nominal voltage of the DC high-voltage digital voltmeter is the maximum measured voltage. The input impedance is and it can measure the open circuit voltage and peak voltage to meet the requirements of the calibration regulations for high voltage meters.
2. Main technical parameters
. Resistance output (high voltage and high resistance box) part
. Accuracy level and working voltage (current) of the high voltage and high resistance box
/> <= dd resistance
Accuracy level
．
．
Nominal voltage
<= dd resistance
Accuracy level
.
.
.
.
Nominal current
．
. Adjustment range: ~
. Operating environment conditions
.. Reference temperature range: ~℃
.. Nominal operating temperature range: ~℃
.. Reference humidity range: ~%
.. Nominal operating humidity range: ~%
. Variation limit: variation caused by changes in a single influencing quantity under reference conditions
<= dd influencing quantity
Standard Weighing range of use
Allowable variation
Ambient temperature
～℃
/ %
Relative humidity
～%
/ %
Working voltage
(~/) Nominal voltage
/ %
★ It is the accuracy level of the 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 shall not be less than the resistance value measured at the nominal voltage.
. 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 <.its variation<.
. Dimensions:
. Weight:
. Voltage measurement (DC high-voltage digital voltmeter) Part
. Measuring range: ~
. Resolution:
. Accuracy: (% reading digits)
. Reading stability: digits
. Input resistance :
. Display: display the test results with digital tube
. Polarity: automatically displayed. When measuring positive voltage, there is no polarity symbol. When measuring negative voltage, the symbol is displayed.
. Measurement speed: approx. times/second
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