Battery Unit
Operation
When a battery unit is installed, the counter can operate
for 2 hours without mains supply.
WARNING: When battery operated, the counter is
not grounded. You must not connect the
counter to any signal that is higher than
30Vrms from ground potential. If you do, the
counter will be dangerous.
The display starts blinking shortly before the battery is dis-
charged.
The counter charges the battery automatically when con-
nected to the mains, no matter how the Power-switch is
set. Charging a discharged battery to 75 % of full capacity
will take 7 hours, and to full capacity, 24 hours.
If the counter is connected to the mains and switched on,
it will not switch to battery operation if you disconnect the
mains. You must first switch the counter OFF with the
power switch, then ON again before the battery unit sup-
plies the counter.
Battery Care
The capacity of the rechargeable battery degrades if the
counter is not powered by the battery frequently. To keep
the battery from degrading, cycle the battery, from fully
charged to fully discharged, occasionally.
The capacity of a degraded battery can be restored by cy-
cling the battery a number of times, but a restored battery
will never reach the capacity of a new one.
If you must store your counter for some time without using
it, store it in a cool and dry place. Leave the counter with
the mains cable connected if possible. If not, don’t discon-
nect the mains cable until the battery is fully charged, then
charge the battery for at least 8 hours every 3 months.
CAUTION:Prolonged storage or use of the counter
at temperatures above +40°C shortens the
life of the battery.
The battery will freeze if it is not sufficiently
charged when stored at a low temperature.
75% charge is sufficient for –40°C.
Error Codes
The counter can display the following error codes if some-
thing goes wrong.
Error OF
Overflow in the counting registers.
Select a shorter Measuring-time if
you get this error code, unless the
counter is set to TOTALIZE, then
you must press reset and start again
from zero.
Error 01
RAM memory error
Error 02
Measuring logic error
Error 03
Internal bus error
If the counter shows one of these error codes, try switch-
ing the counter off and on again. If error code 01-03 per-
sists, call Fluke service. Look on the last page in this man-
ual for Phone No. and address.
Page: 22
OPERATING INSTRUCTIONS
PM 6666 - OPERATORS MANUAL
