Batterycheck - Keithley 600A Instruction Manual

MODEL ~OOAELEC!J!ROME!~ER
Proceed as follows:
(a) Lock the ZERO CHECK Switch.
(b) Connect unknown between INPUT terminal and source of po-
tential. A switch should be connected in the hiph voltage line
so that when the sample is disconnected from the potential, the
low impedance end of the sample is grounded.
(c) FAST-NORMAL switch should be at NORMAL.
(d) Apply potential to sample before unlocking ZERO
CHECK.
Start the RANGE switch at low current sensitivities and
advance the sensitivity until a reading is obtained.
If the potential applied is at least 100 times the ammeter drop (the
setting of the MULTIPLIER switch), the resistance is equal to:
POTENTIAL APPLUD
CURRENT READING
If the potential applied is not large compared to the ammeter drop,
the resistance is equal to:
POTENTIAL APPLIED - INPUT DROP (VOLTS)
CURRENT READING
le) If it is possible to operate
on
FAST micro-microanmreter..
the input drop need not be considered in the
calculation.
F.
BATTERY CHECK
Turn METER-BATTERY switch to Bl, B2, etc.
All batteries should read
half scale or higher on the meter.
Bl, B3, Bh, and B5 are tested directly.
B2a and B2b are tested in
series on position
B2. Since the battery drains are nearly iden-
tical in B2a and B2b, both should be changed when the series arrange-
ment reads low.
B6 and B7 are not tested because they are operated under virtually
shelf-life conditions.
They may be replaced yearly as preventive
maintenance or may be tested at any time by removing the case and
measuring with a voltmeter.
They should be replaced if.they test
less than eight volts.
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