TM8400B-L-00
1 November 2004
STEP 3. Carefully swing open front panel.
STEP 4. Withdraw the chassis as far as necessary, do not remove completely. Support with
suitable wooden block.
10.5. BATH TEMPERATURE VERIFICATION TEST
WARNING
The following tests are done with the chassis exposed and the power turned on. There is
accessible line voltage AC wiring on the top, front and rear panels. Extreme care must be
exercised when working on the inside of this instrument when the instrument is connected
to line voltage, especially when in a salt water environment. Lethal shock hazards may be
encountered through careless procedures.
STEP 1. Open the cabinet and withdraw chassis as per Section 10.4.
STEP 2. Remove thermometer hole cover located in front of conductivity cell assembly,
by removing two screws in cover.
STEP 3. Insert platinum resistance thermometer through exposed hole and into bath to
verify bath temperature accuracy and stability. There is a holder inside the bath to
secure the thermometer.
STEP 4. Turn on the instrument. If digital display is erratic or there is temperature drift
check impeller drive belt for slippage. Clean pulleys and replace belt if
necessary.
STEP 5. Remove thermometer and re-install hole cover.
STEP 6. Ensure fans are operating and air filter is clean.
10.6. DISPLAY METER TEST
STEP 1. Turn instrument on with POWER switch.
STEP 2. Turn FUNCTION switch to ZERO. Ensure display reads 0.0 0000 ±2 digits.
STEP 3. Turn FUNCTION switch to READ. Step SUPPRESSION switch throughout its
range. Observe two left hand digits vary from 0.0 to 2.2.
STEP 4. Turn FUNCTION switch to STANDBY. Observe two left hand digits indicate
bath temperature setting.
STEP 5. Return FUNCTION switch to ZERO.
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