Operation - Keithley 610 Manual

SECTION IV OPERATION
A. PREPARING TRE INSTRUMENT FOR OPERATION
(1) Connect to power line of proper voltage and frequency.
Due to
the extreme sensitivity of the Model 610, the appearance of 60 cps
noise at the output terminals is sometimes encountered.
IF THIS
NOISE IS FOUND TO BE HIGHER THAN 2% OF FULL SCALE, THE POWER PLUG
MAY BE Pi3VERSED TO REDUCE THE NOISE.
It may also help to ground
the case of the instrument to a water pipe or similar earth ground.
Unless otherwise indicated at rear of instrument, the Model 610 is
wired for 100 to 130 volts 50 to 60 cps.
If it is desired to oper-
ate on 200 to 260 volts 50 to 60 cps, consult DR 11861 D at rear of
the manual for instructions.
(2) set controls as follows:
VOLTS SWITCH:
100 volts.
FUNCTION SWITCH:
VOLTS
OPERATE SWITCH:
ZERO CHECK
INPUT TERMINAL:
Shield with cap.
(3) Turn the Power switch to meter c.
The instrument should come to
zero in approximately 30 seconds.
(4) Rotate the VOLTS switch toward the high sensitivity end, adjust-
ing ZERO as required.
If it is impossible to zero the meter with the
front panel ZERO control,
use COARSE BAI. control on rear panel to
bring the instrment within range of the ZERO control.
.
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(5) Connect leads as required for measurement. If high impedance is
involved, the input should be shielded using a coaxial connection or
shielded enclosure. The various accessories for the Model 610 may be
used.
If the impedance is low and leads can be kept short, the binding
post adapter furnished with the instrument may be used.
The Keithley Model 6101 Shielded Test Probe will suffice for most
measurements.
B. MEASURING VOLTAGE
Place FUNCTION switch at VOLTS.
Turn VOLTS switch to expected sensi-
tivity and check meter zero.
Turn OPERATE switch to OPERATE and read.
If the sensitivity of the instrument is increased, rocheck the zero
reading.
For voltages greater than 100 volts, use the Model 6102~10~1 Divider
Probe, or the Model 6103~1ooo:i Divider Probe and measure as above.
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