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GENERAL DESCRIPTION
MODEL 630 PO'TENTIOMETRIC ELECTROMETER
l-3.
APPLICATIONS.
a.
Due to its
very
high
input
resistance,
the Model
630 is very
useful
in making accur-
ate dc measurements
from high
resistance
sources
frequently
encountered
in electrochemical
and physical-chemical
research.
It
is
especially
useful
for
measuring
potentials
from
piezo-electric
crystals,
electro-chemical
cells,
grids
and plates
of tubes,
biological
cells
and pH electrodes.
The Model 630 is also
ideally
suited
for
making Hall-effect
and
fuel-cell
studies,
silicon
resistivity
and capacitor
charge
measurements,
and for
mrasur-
ing gate potentials
of field
effect
transistors.
b.
The null-detector
output
permits
use with
potentiometric
recorders
and digital
volt-
meters
equipped
with
automatic
print-out.
The Model 630 is
useful
in quality
control,
pro-
duct
development,
inspection
and production.
l-4.
SPECIFICATIONS.
AS A POTENTIOMETRIC ELECTROMETER:
LIMIT OF ERROR: ?O.Ol% of reading
or 30 microvolts,
whichever
is greater,
after
30-min-
ute warm-up.
Accuracy
is exclusive
of null-detector
drift.
LONG-TERM STABILITY:
Will
operate
within
stated
limit
of error
for
one year.
TEMPERATURE COEFFICIENT:
Does not exceed 0.001% per OC.
REPEATABILITY:
Within
0.0025%
or 30 microvolts,
whichever
is greater.
MAXIMUM NULL SENSITIVITY:
1 millivolt
full
scale
with
30-microvolt
resolution.
INPUT RESISTANCE:
Infinite
at null,
from 0 to 500 volts.
10 15 ohms at.l%
off
null
frop
0 to 500 volts
with
DETECTOR INPUT Switch
in OPEN position.
FLOATING OPERATION:
500 volts
maximum off
chassis
ground.
INPUT ISOLATION:
Circuit
ground
to chassis
ground:
108 ohms shunted
by 0.05 microfarad.
AS A VIBRATING REED ELECTROMETER:
VOLTAGE RANGES: O-5 volt
full
scale
to 500 volts
in four
decade ranges.
NULL RANGES: 1 millivolt
full
scale
to 100 volts
in six
decade ranges.
INPUT RESISTANCE:
1013 ohms or 1010 ohms selectable
by switch,
L-millivolt
to l-volt
ranges;
1010 ohms, 5 to 500-volt
ranges.
ELECTROMETER ACCURACY: f3% of full
scale
on all
ranges,
exclusive
or noise
and drift.
ZERO DRIFT:
Less than
2 millivolts
per 24 hours
after
Z-hour
warm-up.
Long term drift
is
non-cumulative.
RISE TIME (10% to 90%):
Less than
2.5 seconds
on any range with
1010 ohm source
resistance.
LINE-FREQUENCY REJECTION:
Greater
than 60 db on the l-millivolt
range,
decreasing
to 35
db on the 500-volt
range.
2
1067R
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