Fluke 845AR Level Meter
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High Impedence Voltmeter Null Detector
High Impedance Voltmeter-Null Detector
allows measurement of dc voltages from one microvolt to 1000
volts dc in 19 ranges. When used as a null detector on the
100 millivoltrange and below, the input impedance is an
excellent l$s megohms A linear recorder output allows the
instrument to be used for production testing, and also as a
with a maximum gain of 120 db.
The instrument may be wired to operate from a line power
source of 115 volts ac or 230 volts ac, as desired. The
instrument is designed to be mounted directly in a standard
EIA 19 inch relay rack. Resilient feet are also provided for
bench top use.
1-4. ELECTRICAL SPECIFICATIONS
INPUT VOLTAGE RANGE
1 microvolt to 1000 volts dc end scale in nineteen ranges,
using XI and X3 progression.
100 megohms on 300 millivolt range and above 10 megohms on
1OO-millivolt range and below.
±(3% end scale + 0.1 microvolt).
MAXIMUM NOISE (input shorted)
Range Noise (peak-peak)
1 microvolt 0.20 microvolt
3 microvolt 0. 25 microvolt
10 microvolt - 1000 volt 0.30 microvolt
METER RESPONSE TIME (to 90% of reading)
1 microvolt 5 seconds
3 microvolt 3 seconds
10 microvolt - 1000 volt 1-1/2 seconds
Better than 10*2 ohms at less than 50% relative humidity and
25°C regardless of line, chassis, or recorder
grounding. Better than 1010 ohms up to 80% relative humidity
and 35°C. With driven guard, isolation improves by at least
one order of magnitude up to 1013 ohms. Any input terminal
may be floated 1100 volts off chassis ground.
DC COMMON MODE REJECTION
Better than 160 db, input short-circuited, 80% relative
humidity; better than 140 db, open-circuited, 50% relative
humidity; better than 120 db, open-circuited, 80% relative
AC COMMON MODE REJECTION (below 100 kHz)
100 volts rms or 120 db greater than end scale, whichever is
less, will effect reading less than 2% of end scale. Input
AC NORMAL MODE REJECTION (60 Hz and above)
AC voltages 60 db above end scale will effect reading less
than 2% of end scale. Maximum voltage not to exceed 750
0-1 volt, one side at chassis ground; linear to 0. 5% of end
scale. Source impedance, 5k to 7, 5k.
Stability of zero
Better than 0.15 microvolt/hr, better than 0. 3 microvolt/day.
TEMPERATURE COEFFICIENT OF ZERO
Less than 0.1 microvolt/0C from 15° C to 35° C. Less
than 0. 2 microvolt/0 C from 0°C to 50° C.
ZERO CONTROL RANGE
±5 microvolt minimum.
Up to 1100 volts dc may be applied on any range. Typical
recovery time is 4 seconds.
115/230 volts ac ±10%, 50 to 440 Hz, approximately 3 watts.
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01 April 1980
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10 August 2017