Page 76 of 76 Service & Calibration
4.3.1 1855 Verification Procedure
This section outlines the relevant information to verify performance of the 1855 Meter. It is
recommended that performance be performed at least once a year using this outline procedure.
Instrument should be warmed up for a minimum of 15 minutes prior to verification. Verification
should be performed under the following conditions: Temperature equal to 23°C ±1.2°C and
Relative Humidity (RH) between 35% and 55%.
Recommended standards are listed below. All standards should be traceable to a National
Laboratory (such as NIST) and have calibrated values for primary and secondary parameters at
the required test frequencies. QuadTech’s verification conforms to ANSI Z540 and QuadTech
recommends that the calibrated values for the primary and secondary standards have an
uncertainty 4 times better than the primary and secondary accuracy specified in the Verification
Data Sheet. If the calibrated values for the standards used do not have an uncertainty of 4 times
better than the specified accuracy of the 1855 the uncertainty of the standard should be added to
the specified accuracy of the 1855.
4.3.2 1855 Verification Data Sheet
Out Voltage: @ 10mA
(Verify Display & Measured Values are within high and low limits)
(Note: MEASURE between RED (+) and WHITE (-) mounting jacks)
Voltage Setting
(V)
Measured
Voltage (Fluke)
Displayed
Voltage (1855)
Low Limit
Voltage
High Limit
Voltage
1 795mV 1.205V
50 49.55V 50.45V
200 198.8V 201.2V
400 397.8V 402.2V
600 596.8V 603.2V
IR Measurement: @ .5mA
(Note: MEASURE between BNC jack and WHITE (-) mounting jacks)
Before After Voltage
Setting
(V)
Nominal
Resistance
(Ω)
Actual
Resistance
(Ω)
Displayed
Value
(Ω)
Displayed
Value
(Ω)
Test
Specifications
100V 10M 0.805%
100V 100M 0.854%
200V 1G 0.973%
500V 1G 0.747%
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