SECTION VIII CALIBRATION PROCEDURE
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8-1. General
This section provides general maintenance information and a procedure for calibrating the 4300B. The 4300B
Digital Micro-ohmmeter should be calibrated on a routine basis (annually is recommended) to ensure
continued accuracy. The 4300B should also be regularly dusted using dry, compressed air to remove any
debris.
Before performing the calibration procedure that follows, the 4300B should be warmed up for at least 30
minutes with the top cover in place. The top cover should be replaced after each adjustment has been made.
Allow time for the unit to restabilize after making each adjustment.
8-2.
Required Test Equipment
The following test equipment is required to calibrate the 4300B Digital Micro-Ohmmeter:
1) DC Voltage Standard with available outputs of 1.0000V, .1000V, .010000V ±.005% (Valhalla 2701C or
equivalent)
2) Precision Standard Resistors with known values to within ±0.005%
0.1000
Ω
1.0000
Ω
10.000
Ω
100.00
Ω
*
1000.0
Ω
*
10000
Ω
*
* May be replaced by Valhalla Model 2724A
3) Heavy duty cables capable of carrying 10 amperes of current
8-3. Voltmeter
Calibration
The following procedure describes calibration of the voltmeter section of the 4300B. In all steps the Test
Current should be turned Off, and the .1mA Current Range selected.
8-3-1. Zero Adjustment
Select the 20mV range and apply +0.00001VDC. Adjust RV201 for a reading of 00.10 (±5 digits drift
maximum)
8-3-2. ATC Balance Adjustment
