3: Adjustment DMM6500 6½-Digit Multimeter with Scanning
Calibration and Adjustment Manual
3-2 DMM6500-905-01 Rev. E June 2021
Environmental conditions
To make sure you get accurate results, the environment must meet the following conditions.
Temperature and relative humidity
Conduct the adjustment procedures in a test environment with:
• A stable ambient temperature controlled to vary less than ±1 °C during the period of adjustment.
• Keithley Instruments recommends a calibration adjustment temperature (T
CAL
) of 23 °C. If a
different nominal temperature is used, it should be noted on the calibration report. A relative
humidity of less than or equal to 40 percent, unless otherwise noted.
• No direct airflow on the input terminals.
Line power
The DMM6500 requires a line voltage of 100 V to 240 V and a line frequency of 400 Hz, 50 Hz or 60
Hz.
Calibration adjustments should be performed within this range.
The instrument automatically senses the line frequency at power-up.
Warmup period
Allow the DMM6500 to warm up for at least 30 minutes before conducting the adjustment procedures.
If the instrument has been subjected to temperature extremes (more than 5 °C above or below T
CAL
),
allow additional time for the internal temperature of the instrument to stabilize. Typically, allow an
additional 30 minutes to stabilize an instrument that is 10 °C outside the specified temperature range.
Also allow the test equipment to warm up for the time recommended by the manufacturer.
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