Monroe Electronics Electrostatic Voltmeter - Isoprobe® - model 244A - Manual (Page 5)

5
SECTION 1
SPECIFICATIONS
A. APPLICATIONS:
The Model 244A instrument permits accurate voltage measurements of
electrostatic or other high impedance sources without physical contact. It utilizes
an electrostatic chopper for low drift, and negative feedback for accuracy and
probe-to-surface spacing insensitivity.
B. FEATURES:
■ Integrated Solid State Circuitry
■ Good Accuracy
Stability
Reliability
■ Easy Maintenance
■ ±3kV Input Range
■ Fast Speed-of-Response
■ Specified AC Performance
■ Low Noise
■ Digital Liquid Crystal Display
■ HV/1000 Recorder Output
■ Connectable for unlimited multiple channel operation
C. RANGE: 0 to ±3000 volts DC.
D. STATIC ACCURACY:
The recorder output accuracy referred to the input is better than 0.10% of reading
or 0-1V whichever is greater. (Probe-to-surface spacing .020”, 0.5mm).
E. SPEED-OF-RESPONSE:
10-90% probe-to-surface spacing .040" (1.02mm), gain adjusted for critical
damping.
Speed of Response
typ. max.
1kV Step .......................................... 1.5 msec ................. 2.5 msec
2kV Step .......................................... 2.0 msec ................. 3.5 msec
3kV Step .......................................... 3.0 msec ................. 4.5 msec
F. SETTLING TIME:
typical - 3.5msec. 0-99% 1kV step, 040"(1.02mm) gain adjusted for critical
damping.
15 msec. 0-99.9% 1kV step, .040"(1.02mm)