Handheld Instruments Basic Service
9
DMM800 Series Performance Verification
This section contains procedures to verify that the DMM830, DMM850, and
DMM870 Digital Multimeters perform as warranted. If an instrument fails any
of these checks, it needs adjustment and or repair.
The performance verification procedures provide a valid confirmation of
instrument electrical characteristics and function under the following conditions:
The multimeter operates in an 18 to 28
C (64 to 82 F) ambient
environment with a relative humidity of less than 75%.
The multimeter stabilizes in the stated ambient temperature for one hour.
The multimeter warms up for five minutes.
For AC measurements, allow the multimeter to settle to its final value before
taking the measurement.
The multimeter remains fully assembled and in the holster.
The DMM800 Series performance verification consists of the checks listed in
Table 7.
Table 7: Performance verification checks
AC Volts C heck
DC Volts C heck
DC Millivolts C heck
AC +DC Volts C heck
F requency C heck
Duty F actor C heck (DM M850 and DM M870)
C heck
Low Voltage
C heck
C ontinuity C heck
Diode C heck
C apacitance C heck
Temperature C heck (DMM 850 and DM M870)
Volts P eak Hold C heck (DMM 870)
DC Milliampere C heck
AC Milliampere C heck
DC Ampere C heck
AC Ampere C heck
The performance verification procedure should be performed annually or after
every 2000 hours of operation if used infrequently.
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