Omega Speaker Systems HH-23A - Manual (Page 12)

10
MEMORY BACKUP
During battery replacement, the contents of user-programmed memory
(data, operating modes, etc.) can be saved. Prior to removing the old battery,
turn off the instrument, and connect a Model HH22A-AC battery charger in
the U.S.A.. Then exchange batteries, and disconnect the battery charger. Do
not leave the battery charger connected to instruments with non-recharge-
able batteries.
OPERATION WITH RECHARGEABLE
BATTERY
Model HH22A-AC provides a 9-volt Ni-Cd battery and recharger suitable for
use with the unit in the U.S.A.. This battery provides 15 hours of continuous
operation. This duration can be extended indefinitely by operating simultane-
ously from both the battery and recharger.
OPERATING INSTRUCTIONS
The following instructions make reference to keypad inputs, and display read-
outs. Refer to Figure 2 to locate key switches, and identify display differences
between thermometer models. Model HH-22A is similar in layout to the HH-
23A, except operation is limited to K and J thermocouples.
1. DIAGNOSTICS
Automatic diagnostics provide error indicators which are described below.
PROBLEM: LIKELY CAUSE:
Blank display, unit does not (1) Improper battery installation. Check
power-up. battery polarity.
(2) Dead battery.
Low BAT Annunciator. (1) Low battery voltage, install a new
battery. If problem persists, consult
factory.