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OPERATION
MODELS 6lOB,
610BR ELECTROMETERS
c.
3-Volt
output.
Connect
oscilloscopes
and pen recorder
amplifiers
to the OUTPUT
Receptacle.
Pin no.
1 is
the
negative
terminal;
pin
no.
2 is
grounded.
Set the Output
Switch
to 3 V.
The Model
6lOB output
is now +3 volts
for
full-scale
meter
deflection
on
any range.
Internal
resistance
is
3 kilohms.
The frequency
response
($3 db)
is dc to
300 cps at a gain
of 3000,
rising
to
25 kc at a gain
of 30, and decreasing
to 2.5 kc at a
gain
of 0.03.
Noise
is 3% rms of
full
scale
at a gain
of 3000,
decreasing
to 1% at gains
below
100.
The METER Switch
does not
reverse
the output
polarity.
NOTE
The Model
610B may be used with
the
FEEDBACK Switch
fn FAST position
with
other
instruments.
However,
make sure
there
is no common ground
between
the Electro-
meter
us3
end the other
instrument.
d.
l-Milliampere
Output.
Connect
l-milliampere
instruments,
such
as Esterline
Angus,
General
Electric
or Texas
Instrument
Rectiriter,
to the OUTPUT Receptacle.
Pin
no.
1 is
the
negative
terminal.
Set
the Output
Switch
to 1 MA.
The output
is
approximately
1 mil-
liampere
for
full-scale
meter
deflection
on any range.
For exact
output,
adjust
the meter
on the
.003-volt
range
with
the
FINE ZERO Control
for
full-scale
deflection.
Then adjust
the
1 MA CAL Control
until
the
recorder
reeds
full
scale.
Check the
recorder
and meter
zero
end repeat
adjustment
if
necessary.
The METER Switch
does not
reverse
the
output
polarity.
e.
For servo
rebalance
recorders,
use a divider
across
the Model
610B OUTPUT Receptacle.
See Figure
8.
Set the Output
Switch
to 1 MA.
Use the
1 MA CAL Control
to trim
the
output
for
full-scale
recorder
deflection.
Operation
is
the
same as for
current
outputs.
A
1-$
Model
1 kn
Model
610B
6108
output
(JlO5)
*
It
1
1 kn
Output
50-mv
(J105)
loo-mv
50 0
Recorder
100 n
Recorder
50-millivolt
output
2)
:
100~millivolt
output
FIGURE 8.
Divider
Circuits
Across
Model
610~ Output.
The dividers
are
for
driving
50
and 100-millivolt
recorders.
Use 1% resistors
in
the dividers.
f.
When the FEEDBACK Switch
is
in
the NORMAL position,
the
negative
side
of the
output
terminal
is grounded
to the
instrument
case.
Therefore,
no difficulty
will
be experienced
using
oscilloscopes
end recorders
with
the Model
61OB set
for
normal
operation.
In FAST
position,
however,
neither
side
is
grounded.
If
this
is
used,
make sure
there
is no com-
mon ground
between
the
recorder
or oscilloscope
end the Model
6108 case,
or use the
unity-
gain
output.
16
;:
10&R
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