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5.3.4 Preventive Maintenance/Cleaning
In addition to the annual battery replacement and calibration discussed below periodic
cleaning of dust from the 3 1/3" disk drive (when this option is present) is recommended
depending on the environmental conditions. Vacuuming of the drive by qualified service
personnel should be done in accordance with common procedures used in computer
maintenance.
5.4
Calibration
5.4.1 General
Calibration of the 1865 Megohmmeter is recommended on an annual basis. If the unit is
to be returned to QuadTech for factory calibration refer to paragraph 5.2 for instructions.
Using the procedure below the instrument can also be calibrated by a qualified
service person if traceable calibration equipment and standards are available.
Requirements for Re calibration
Temperature stabilized room at 23 degrees C (73.4 F)
Precision Digital Voltmeter (0.01% accuracy) with calibration traceable
to NIST
1 Megohm standard resistor of known value (within 0.01%) at 100V for
direct connection to 1865 input terminals and traceable to NIST
5.4.2 Calibration Procedure
The step by step instructions for this procedure are shown on the instrument display and
discussed below.
1. First set time and date by selecting [SET TIME/DATE] on the Utilities menu.
2. Select CALIBRATION on the Utilities menu. Once [ENTER] is selected the
calibration code of [1][8][6][5][2][2][5] must be entered to continue. This code is to
prevent unauthorized personnel from effecting the instrument calibration. The code
might want to be blanked out in this manual. After the calibration code is entered the
stored reference voltage is displayed and can either be accepted or measured and re-
entered as instructed.
Page 86 of 87
Service & Calibration
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