Compliance West HT-2000PR, Instruction Manual

Page: 38 / 41

32
General Maintenance
Interior Access
NOTE
To avoid contaminating the PWB with oil from your fingers, handle it by the edges or wear
gloves. If the PWB becomes contaminated, refer to the cleaning procedures given later in this
section.
Use the following procedures to gain access to the calibration adjustments of your instrument.
1. Set Line Power switch to OFF.
2. Disconnect the power cord from the rear of the instrument.
3. Remove the two upper screws on each side of the unit.
4. Grasp the top of the enclosure clamshell and lift it off the front and rear panels.
5. Calibration adjustments of the ground resistance are now accessible.
6. To reassemble, reverse steps 1-5 above.
WARNING
Dangerous voltages exist when energized. Exercise extreme care when working on an
energized circuit.
Cleaning
CAUTION
Do not use aromatic hydrocarbons or chlorinated solvents for cleaning. These solutions
will react with the plastic materials used in the instrument.
Clean the front panel and case with a mild solution of detergent and a damp sponge. Clean dust
from the PWB with clean, dry, low pressure (<20 psi).
Calibration Procedure
The Calibration Procedure should be performed annually and any time your instrument has been
repaired. The calibration procedure consists of three parts:
1) The Voltage Calibration adjustment calibrates the voltage output to agree with the meter
reading.
2) The Leakage current adjustment calibrates the output current measure for the leakage
fail/pass point.
3) The Continuity Calibration adjustment sets the pass/fail point for the continuity check.
Before starting the Calibration procedure, perform the interior access procedure given earlier in
this Section.
NOTE
Allow the instrument to stabilize for approximately five minutes. Perform all calibration
adjustments at an ambient temperature of 23
° C ± 5 ° C (73 ° F ± 9 ° F).