Monroe Electronics 257D User Manual
Operators’ Manual
for
Monroe Electronics, Inc.
Model 257D
Portable Electrostatic Fieldmeter
P/N 0340176
257D/100
110309
CONTENTS
SPECIFICATIONS ……………………………Section 1 .........................................Page 1
Features......................................................................................................... Page 1
Specifications................................................................................................. Page 1
GENERAL INFORMATION…………………..Section 2.........................................Page 2
Applications.................................................................................................... Page 2
INSTALLATION………………………………. Section 3 ........................................Page 3
Portable Operation ......................................................................................... Page 3
Power Line Operation ....................................................................................Page 3
Installation of Probe ....................................................................................... Page 3
Output ............................................................................................................ Page 3
Grounding ...................................................................................................... Page 3
OPERATION……………………………………Section 4 ........................................Page 4
POWER ......................................................................................................... Page 4
BACKLIGHT................................................................................................... Page 4
RANGE .......................................................................................................... Page 4
TEST.............................................................................................................. Page 4
ZERO ............................................................................................................. Page 4
STATUS......................................................................................................... Page 4
MAINTENANCE………………………………..Section 5 ........................................Page 5
Precautions .................................................................................................... Page 5
Cleaning......................................................................................................... Page 5
Battery............................................................................................................ Page 5
Calibration...................................................................................................... Page 5
PROBE INFORMATION………………………Section 6 ........................................Page 6
General .......................................................................................................... Page 6
Sensitivity....................................................................................................... Page 6
Mounting ........................................................................................................ Page 6
Geometry ....................................................................................................... Page 7
Cables............................................................................................................ Page 8
Purging........................................................................................................... Page 8
Cleaning........................................................................................................ Page 9
FIELDMETER REFERENCES……………….SECTION 7.................................. PAGE 10
WARRANTY AND REPAIR INFORMATION ………………. ............................. PAGE 11
Copyright© 2000
Monroe Electronics, Inc.
Printed in USA
Specifications and procedures subject to change without notice
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Section 1
SPECIFICATIONS:
Features:
Battery or line operation
Two ranges: 2 kV/cm and 20 kV/cm
Remote probe for easy monitoring of hard-to-reach locations.
Chopper stabilized, fed-back design for accurate measurements in ionized environments
Recorder output for unattended monitoring
Specifications:
Ranges: 2 kV/cm and 20 kV/cm
Sensitivity: 1 V/cm and 10 V/cm, respectively
Static accuracy: Better than 5% of reading
Drift: <30 V/cm/hour, non-cumulative after 30 minute stabilization, referred to
input
Noise: <10 V/cm rms, 0 – 200Hz, referred to input
Response speed: 250 ms 10% to 90% (typical)
Analog output: 1/10,000th of input, <10 impedance
Battery: Built-in, re-chargeable, gel-type, 12 V, 1.2 AH, >8 hours with backlight on
– charging system on-board, <6 hours re-charging time
DC power: Power adapter supplied:
Input: 100 – 240 VAC/ 47 to 63 Hz/400mA
Output: 18 VDC/840mA
Dimensions: 10½”D x 63/8”W x 25/8”H
(26.7 x 16.2 x 6.7 cm)
Weight: 2 lbs., 6 oz. (1.1kg)
Instrument operating environment:
25ºC, ±10ºC, 0-85% RH non-condensing
Probe: 1036F-5, 1¾”D x 1¼”H (4.4 x 3.2 cm), 8 oz. (0.2kg)
with 10 ft. (3m) cable – optional extension cable up to 1000 ft. (300m) permitted
Probe operating environment: 30ºC to 100ºC, 0-85% RH non-condensing
Industry approvals:
Probe approved by Factory Mutual Research Corporation as intrinsically safe for
use in Class I, Division 1, Groups C and D hazardous locations when used with
approved IS barriers
CE approvals pending
Accessories included: Alligator clip with boot
Banana patchcord
AC power supply
Manual
1
Section 2
GENERAL INFORMATION
The Model 257D Portable Electrostatic Fieldmeter measures electrostatic field (potential
gradient) in kilovolts per centimeter. Using the probe-to-surface separation as a
calibration factor, it may also be used to measure surface voltage.
The instrument utilizes all solid-state components including modern integrated and
hybrid circuits.
It may be operated from its internal re-chargeable battery system or optionally from AC
power lines. All essential operating controls are located on the instrument’s front panel.
A rear panel-mounted BNC connector provides an analog output for monitoring. A
standard banana jack and mating cable with clip is provided for grounding purposes.
The carrying case has storage space for the probe, manual and accessories.
Applications:
One major application of the Model 257D is the monitoring of electrostatic charge
accumulation. As charge increases on the surface of a material, the electrostatic field in
the vicinity also increases proportionately. Thus the Model 257D reliably provides an
output signal proportional to the surface charge accumulation while making NO
PHYSICAL CONTACT to the material being monitored.
Other applications include:
Monitoring the effectiveness of static elimination equipment
Atmospheric electricity measurements.
High voltage DC transmission terminal measurements
Monitoring of coating, capping or filling processes
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