Monroe Electronics Electrostatic Voltmeter - Isoprobe® - model 279L - Manual (Page 5)

Page 2
I. Drift:*
<0.01V/hr after 1 hr stabilization (0.003V/hr typical). Not measurably affected by 10 C temperature
variation or changes between 10% and 90% relative humidity.
J. Noise:*
<90mV rms referred to input, typical.
K. Surface resolution:
Determined by probe aperture size and surface-probe separation. Standard type 1034E & S probes
with 0.07” (1.75mm) aperture will resolve a 0.10” (2.5mm) spot at 0.02” (0.5mm) separation.
L. Recorder output:
100:1, 3 volts full-scale
M. Output filter:
Bessel low pass filter with 1.2ms constant delay.
N. Size:
1.7 x 8.2 x 15.1 inches (44 x 208 x 384mm), 1.75” rack mounting available (1 or 2 per rack).
Weight 4 lb. (1.8kg).
O. Power requirement:
100, 120, 230 or 240 VAC, 10%, 50/60Hz, 15 watts.
Fuse 1 /
4
A SB for 100 & 120 V (Littelfuse 313.250 or equiv.)
Fuse 1 /
8
A 5x2mm for 230 & 240 V (Littelfuse 217.125 or equiv.)
* Dependent on specific probe model, probe-to-surface separation and environment. Specifications shown are for
standard Type 1034E or S probes in a normal laboratory atmosphere. Separation for accuracy and response speed
tests is
1 /
8
” (3mm) and for noise and drift tests, 0.005” (0.13mm). Performance generally improves in controlled
environments and may be degraded under exceptionally dirty or dusty conditions or in ambiance of unstable
gaseous constituents.
PROBES:
Monroe Electronics Type 1034E (end viewing) or 1034S (side-viewing) probes are 0.35” (9mm) x 0.35” (9mm) x
3.25” (82.6mm) in length. Add 0.8” (20mm) length for cable at minimum bend radius. Contains 1kHz tuning fork
chopping driver and onboard hybrid microcircuit preamp. Useable from -50
C to +80C. Optional probe
configurations are available for high or low resolution and transparent probes for light decay measurements. Length
of probe cable is 10 ft. (3.05 meters). Provision has been made for air or inert gas purging of probe. Standard basic
instrument package includes Model 279L electrostatic voltmeter, line cord and instruction manual. Rear mounted
connector on instrument is standard; front panel connector is optional. Unit is calibrated independent of probe and
includes certificate of NIST traceability. Interchangeable Model 1034 probe (type specified by customer) is sold
separately.