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Operating Information
WFM 90 and WFM 91 Service Manual
2–3
Follow these instructions when physically installing this instrument:
Power Source. This instrument is designed to operate from either six C-cell
batteries, alkaline or rechargeable NiCad, or from an AC adapter wall unit
producing 12 VDC.
CAUTION. To avoid possible damage to the instrument circuitry when using a DC
power source other than the supplied AC adapter, ensure that the DC source is a
negative-ground +11 V to +18 V system with a negative center lead. The DC
source must provide 12 W of power.
Fuse. This instrument does not have an external power fuse. There are two fuses
located internally on the Bottom board. See page 6–34 of the Maintenance
section for instructions on how to check and replace the power supply fuses.
Battery Operation. The rechargeable NiCad batteries are automatically recharged
when the AC adapter is plugged into the instrument, whether the instrument
power is on or off. The battery charge time is approximately 6.5 hours when the
instrument is off and 20 hours when the instrument is on. The instrument shifts
into a safe trickle-charge mode, which can run indefinitely, when the NiCad
batteries are fully charged. See Table 1–9 on page 1–11 for information regarding
the length of time the instrument will operate on batteries.
The message Low Bat is displayed on screen when the remaining battery power
cannot guarantee reliable instrument operation. The length of time the instrument
will continue to operate after this message is displayed is dependent on the
current operating mode of the instrument and the type of batteries installed.
Use the rechargeable NiCad battery pack in full charge and discharge cycles to
optimize the battery life and capacity. Fully discharge the battery pack before
recharging, and then charge the battery pack until it is fully charged. A new
battery pack will take a few charge and discharge cycles to reach full capacity.
Refer to Batteries on page 6–21 for the instructions on how to install and remove
the batteries.
Operational Jumpers and Installed Options. This instrument does not have any
internal operational jumpers or installed options. All instrument configurations
are available through the on-screen menus.
Operating Environment. Refer to Table 1–8 on page 1–10 for the environmental
limits of this instrument.
Electrical Installation