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MODELS 61.0~. 610B~ ELECTROMETERS
OPERATION
c.
Connect
the power
cord
and turn
the XF,TER Switch
to CEpiTER ZERO.
Within
ten
seconds,
the meter
pointer
should
come to the
center
zero
position.
If
not,
adjust
to meter
zero
with
the MEDIUM and FINE ZERO Controls.
Normally,
there
is no need fo use the COARSE ZERO Switch.
d.
After
a few moments
increase
the voltage
sensitivity
by advancing
the
Multiplier
Switch
to .3,
.L,
etc.
Continue
zeroing
with
the
FINE ZERO Control.
NOTE
Always
turn
the Model
6lOB off
using
the METER Switch.
Do not
shut
the
instrument
off
by disconnecting
the
power
cord
or otherwise
externally
shutting
off
the power
supply.
If
it
w
be turned
off
externally,
set
the Multiplier
Switch
to 1 or lower.
If
these
cautions
are not
followed,
the
Electrometer
may drift
for
several
hours
when it
is used again.
e.
After
Long periods
of storage
or after
an overload,
the Model
610B
may drift
excessively.
Although
the
electrometer
tubes
are
shock
mounted,
a
severe
jolt
can also
cause
a zero
offset.
This
is
corrected
with
the Zero
Con-
trols.
Drifting,
however,
can occur
for
a few hours.
f.
Although
the grid
current
of the
Electrometer
is much below
that
found
in conventional
voltmeters,
it
can be observed
on the meter.
A small
voltage
results
from
the grid
current
charging
the
input
capacity,
and the
Electro-
meter
appears
to drift
when the
input
is
open.
Use the
ZERO CHECK Button
to discharge
the build-up.
NOTE
Keep the protective
cap on the
INPDT Receptacle
when the
Electrometer
is not
in a circuit.
g.
Follow
the
particular
procedures
for
measuring
voltage,
current,
re-
sistance
and charge
in
the next
four
paragraphs.
2-5. Voltugo
Measurements.
a.
The Model
610B's
high
input
impedance
allows
circuit
measurements
with-
out
causing
circuit
loading.
For
low resistance
in-circuit
tests,
the
input
resistance
can be Lowered
to avoid
pick-up
problems,
NOTE
Make all
voltage
measurements
with
the FEEDBACK Switch
&
in
the NORMAL position.
b.
High
Impedance
Measurements
(LO14 ohms,
22 picofarads).
Follow
the
instructions
of paragraph
2-4.
Set the controls
as follows:
METER Switch
Range Switch
Multiplier
Switch
FEEDBACK Switch
ZERO CHECK Button
CENTER ZERO
VOLTS
100
NORMAL
LOCK
t064R
Y
I
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