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1.0 GENERAL INFORMATION
This voltmeter is a 4 1/2 digit panel meter for applications which require
a compact, quality DC voltmeter. This model uses dual-slope conversion.
Additionally, it provides automatic zeroing before each reading and does so with
a minimum of parts for increased reliability.
The voltmeter has a resolution of 1 part in ±19999 counts. By using an external
DC voltage reference, any of the given ranges can be configured for 3-wire
(common ground) ratio measurement with readout from 0 to 1.9999.
Standard features include selectable decimal point location, display hold, test and
blanking. Each model contains the required circuitry for full range selection and
easy configuration.
2.0 SPECIFICATIONS
2.1 ANALOG INPUT
Model -3 -4 -5
Range ±1.9999 Vdc ±19.999 Vdc ±199.99 Vdc
Resolution 0.1 mV 1 mV 10 mV
Maximum input 250 V rms, 350 Vp 250 V rms, 1000 Vp 250 V rms,1000 Vp
Input resistance 1 Gohm 1 Mohm 1 Mohm
Bias current 10 pA 1 pA 1 pA
Configuration differential
Zero automatic
Span adjustment ±5%
2.2 REFERENCE INPUT FOR 3-WIRE RATIO
Analog input range ±2 Vdc, ±20 Vdc, ±200 Vdc
Reference voltage +0.5 to +2.0 V
Load on reference 80 ohm (std), 100 Mohm (opt)
Accuracy 99.95%
2.3 NOISE REJECTION
NMR, sig hi to sig lo 56 dB at 50/60 Hz
CMR, sig lo to ana gnd 86 dB from DC to 60 Hz
CMV, sig lo to ana gnd ±1.0 Vdc
CMR, ac gnd to ana gnd 120 dB from DC to 60 Hz
CMV, ac gnd to ana gnd 2100 Vp per HV test, 354 Vp per IEC 348 spacing