DCM300 and DCM320 Adjustment Procedures
Handheld and Benchtop Instruments Basic Service
11
Preparation for Adjustment
The following guidelines apply to all DCM300 & DCM320 adjustments.
H Perform all adjustments in a 21_ to 25_ C ambient environment with a
relative humidity of 75% or less.
H Before making any adjustment, warm up the multimeter for 20 minutes.
H Do not alter any setting without reading the entire adjustment procedure first.
H Do not alter a setting unless a performance characteristic cannot be met at
the current setting.
H Read the Safety Summary at the beginning of this manual.
You must open the meter case to gain access to the internal adjustments.
1. Lay the meter face down on a flat work surface.
2. Remove the two screws from the meter bottom with a Phillips-head
screwdriver.
3. Gently lift the end of the bottom cover until it unsnaps from the top cover.
Do not remove the circuit board mounting screws.
To reassemble the meter following the adjustments, perform steps 2 and 3 above
in reverse order.
Adjustment Procedure
To return your instrument to factory calibration, perform the following proce-
dures.
WARNING. The following procedures produce magnetic fields that may cause a
malfunction in heart pacemakers or damage to sensitive equipment.
To adjust the AC current calibration, perform the following steps.
1. Set up the AC current calibrator to output 100 A at 50 Hz.
2. Set the multimeter function switch to the A
position.
3. Select the appropriate coil to multiply the AC current calibrator output by
100 A at 50 Hz.
Open the Meter Case
AC Current
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