Monitor Audio Vector User Manual download pdf (Page 26)

Getting Started: Installation

1–12

WFM 90 & WFM 91 User Manual

Electrical Installation

Power Source

The WFM 90 and WFM 91 are designed to operate from either six

C-cell batteries, alkaline or rechargeable NiCad, or from an AC

adapter wall unit producing 12 VDC.

CAUTION. DC Power Source

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 – 18 V system with a negative

center lead. The DC source should be able to provide 12 W of power.

Battery Operation

The rechargeable NiCad batteries are automatically recharged when

the 12 VDC adapter is plugged into the instrument. The batteries are

recharged while instrument power is on or off. The battery charge

time is 6.5 hours when the instrument is off, and 20 hours while the

instrument is on. The WFM 90 and WFM 91 shifts into a safe

trickle-charge mode, that can run indefinitely, when the NiCad

batteries are fully charged.

The message

LOW BAT is displayed on-screen when the remaining

battery power cannot guarantee reliable instrument operation. The

length of time the WFM 90 and WFM 91 will continue to operate

after this message is displayed is dependent on the current operating

mode of the instrument.

For optimal battery life and capacity, use the rechargeable NiCad

battery pack in full charge/discharge cycles. In other words, 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/discharge cycles to reach full capacity.

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Monitor Audio Vector User Manual Page 26