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DMM249 Performance Verification
8
This section contains procedures to verify that the DMM249 Digital Multimeter
performs 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:
H The multimeter operates in an 18_ to 28_ C (64_ to 82_ F) ambient
environment with a relative humidity of less than 75%.
H The multimeter stabilizes in the stated ambient temperature for one hour.
H The multimeter warms up for five minutes.
H For AC measurements, allow the multimeter to settle to its final value before
taking the measurement.
H The multimeter remains fully assembled and in the holster.
The DMM249 performance verification consists of the checks listed in Table 4.
Table 4: Performance verification checks
AC Volts Check
DC Volts Check
W Check
Continuity Check
DC Milliampere Check
AC Milliampere Check
DC Ampere Check
AC Ampere Check
The performance verification procedure should be performed annually or after
every 2000 hours of operation if used infrequently.
Handheld Instruments Basic Service
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