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Maintenance & Calibration
Routine hardware maintenance is limited to re-calibration and cleaning. The only repair
maintenance that can be carried out by the user is fuse or standby battery replacement.
From time to time firmware enhancements may be available which can be uploaded from a PC to
the instrument’s Flash memory.
Calibration
Calibration is guaranteed as in the specification. The manufacturers provide a re-calibration
service, as do most of their agents overseas. Where owners wish to carry out re-calibration
themselves, this should only be done by skilled personnel with access to precision equipment
working in conjunction with the service manual, which may be purchased directly from the
manufacturers or their agents overseas.
Fuse – Instrument Power
The instrument power fuse is located in the fuse holder which forms part of the inlet socket on
the rear panel. Refer to the Installation section for the fuse-rating appropriate to the operating
supply voltage.
Fuse – Load Power
A high voltage, high breaking current, fuse is fitted internally in the load power circuit; the correct
fuse type is 10 x 38mm 20A 500V HBC Type aM or gL.
To gain access to the fuse, disconnect the instrument from all voltage sources and remove the
screws retaining the top cover. Lift off the cover; the fuse is on the load power printed circuit
board mounted on the side of the chassis behind the front panel appliance connector. Make sure
that only fuses of the specified type are used for replacement.
Cleaning
If the instrument requires cleaning, use a cloth that is only lightly dampened with water or a mild
detergent. Polish the display gently with a soft dry cloth only.
WARNING! TO AVOID ELECTRIC SHOCK, OR DAMAGE TO THE INSTRUMENT, NEVER
ALLOW WATER TO GET INSIDE THE CASE. TO AVOID DAMAGE TO THE CASE OR
DISPLAY NEVER CLEAN WITH SOLVENTS.
Battery Replacement
The instrument uses a battery to support both a real-time clock and the settings memory. If the
date reverts to 01-01-2000 then the battery needs to be replaced.
In the HA1600A the battery is user replaceable; proceed as follows:
1. Disconnect (by unplugging) both the Instrument Power and the Test Power connections
from all mains supplies.
2. Remove the four screws holding the top cover and lift the cover off the unit.
3. Remove the battery from its holder and replace with a 3V Li/Mn0
2
20mm button cell type
2032. Do not short circuit the battery while removing or replacing it – in particular do not
use metal pliers to hold it.
4. Exhausted cells must be disposed of carefully in accordance with local regulations; do not
cut open, incinerate, expose to temperatures above 60°C or attempt to recharge.
5. Replace the top cover, ensuring that all four screws seat securely.
In older HA1600 units, the battery is soldered in. In this case, return the unit to a service centre to
have it replaced by a holder and a user replaceable battery.