Monroe Electronics 288B User Manual
Operators’ Manual
Monroe Electronics, Inc.
Model 288B
Charge Plate Monitor
P/N 0340174
288-1/100
V2.10
022713
100 Housel Ave PO Box 535 Lyndonville NY 14098 1-800-821-6001 585-765-2254 fax: 585-765-9330 monroe-electronics.com
CONTENTS
Specifications Section 1
Specifications Page 4
Accessories included Page 5
What this instrument does Page 6
Physical description Page 6
General Information Section 2
CAUTION – SHOCK HAZARD Page 7
Setup – Section 3
First things first
SETUP SYSTEM Menu Page 9
SETUP for Manual Test Menu Page 9
SETUP for Auto Sequence Menu Page 9
SETUP OPTION Menu Page 10
Operation Section 4
Manual operation Page 11
Programming features for manual test Page 13
Automatic operation Page 14
Programming features for auto sequence Page 15
Additional features Page 17
Group and location Page 17
Test parameter setups Page 17
Data storage and review Page 17
Peak reset Page 18
Plate voltage bar graph Page 18
Power Page 18
Charge plate Page 18
Grounds Page 18
Analog output Page 18
Page 8
Maintenance Section 5
Precautions Page 19
Cleaning Page 19
Battery Page 19
Charge state indicator Page 19
Calibration Page 19
References Section 6
References Page 20
Warranty Information
Repair Information
Copyright© 2008
Monroe Electronics, Inc.
Printed in USA
Specifications and procedures subject to change without notice
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Section 1
Specifications
All specifications are referred to plate voltage unless otherwise specified.
Display 240 x 64 character/graphic
Voltage - 3½ digit display (Decay and Peak reading)
Accuracy ±0.1% of reading ± 3 lsd
Resolution 1 volt for readings > 99 volts
0.1 volt for reading < 100 volts
Time - 4 digit display
Accuracy 0.1% of reading ± 1 lsd
Resolution 0.1 second for readings < 1000 seconds
1 second for reading > 999 seconds
Electrometer
Dynamic range ±1200 volts
Follower error < 10 mV
Speed of
Response < 10 msec for 1 kV to 0 volts (90% - 10%)
Bandwidth -3db @ 1Khz 20V
-3db @ 10Hz 2000V
Noise <12 mV
Monitor output Divide by 200
Accuracy 0.1% of reading ± 12 mV
Output
Impedance 1 kΩ
Start Voltages 1000 volts ±0.3% Standard
Range ±10 to ±1000 volts.
Resolution settable to 1 volt
Accuracy 0.3% of setting ± 2.5 volts
Stop Voltages 100 volts ±3% Standard
Range 0 - ±995 volts
Resolution settable to 1 volt
Accuracy 0.3% of setting ± 2.5 volts
Charge voltage
Range 10 to 100 volts above the start voltage
Resolution settable to 1 volt increments
Accuracy 0.3% of setting ± 2.5 volts
rms
p-p
p-p
Charge Plate
Capacitance 20 pF ±10%
Zero Drift < 100 mV /sec (no incident ion flow)
Self Discharge < 200 mV/sec
Peak Detector
Balance Test
Bandwidth <10HZ (pulse width >50msec less 10% error typ.)
Temperature Sensor
Range 0 - 50˚C
Accuracy ±2˚C typ
Humidity Sensor
Range 10% - 80% RH @ 25˚C
Accuracy ±5% typ
Operating
Temperature 5˚C to 35˚C
Humidity to 80%, non condensing
Battery life 6 hours
Charge time < 8 hrs to > 90% capacity
Power
Voltage 90 – 250 VAC 50/60 Hz
Wattage < 12 watts operating
CPM
Size 11” x 9” x 6” (280 x 229 x 152 mm)
Weight 12 ½ lb (5.7 kg)
Accessories Included:
CD containing: 288B Operator’s Manual
288B Data Sheet
288COM Software
288COM Software Operator’s Guide
288B Graph Data Sheet
110V Line Cord
220V Line Cord
DB9 M/F Straight-Thru Cable
Ground Cable w/snap
5ft Plate Ext Cable
Patch cord w/alligator clip & boot
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What this instrument does —
This instrument is a charged-plate monitor for evaluating the performance of ionization
systems. As such, it performs positive and negative decay tests, and balance (offset voltage)
tests to determine if an ionization system is operating effectively. It can be used to test all
types of ionization systems as described in ESD Association Standard ANSI/ESD STM3.1
Ionization.
Over the years new technologies have placed new demands on both ionization systems and
on the capabilities and features of the charged-plate monitors used to evaluate them. Monroe
Electronics has responded to these needs by incorporating many additional and improved
features in the Model 288 Charged-Plate Monitor. The original Model 288 provided the
following important capabilities for people evaluating ionization systems:
Replacement of the fieldmeter normally used to monitor the plate voltage with a high-
voltage follower amplifier to increase accuracy and reduce zero drift
Wider bandwidth to evaluate AC ionization systems
The ability to automate commonly-repeated sequences of tests and store their test
results for future review
Adjustable start and stop voltages for decay tests
A serial interface and applications software to control ionization tests from a computer
The Model 288B has been improved to provide the following capabilities:
The ability to resolve the plate voltage with 100 mV resolution
Applications software to graphically display decay and balance waveforms in real
time
The ability to measure the performance of the latest high-frequency AC ionization
systems
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Section 2
GENERAL INFORMATION
Model 288 performs manual or automatic decay and balance tests for qualification and
periodic verification of ionization equipment. It then stores the results and balance averages
for manual tests and complete automatic test sequences up to a maximum of 1500 tests.
Temperature and relative humidity are displayed real-time and recorded with the test data.
All instrument functions are controlled by five key pushbuttons.
In DECAY mode a built-in high voltage generator charges the plate to a voltage specified by
the user – up to 1100 volts. During the test the plate will discharge toward zero in the
presence of ionization. The elapsed time of decay between a selected start voltage and a
selected stop voltage is displayed.
In the BALANCE mode, the plate is first grounded then released from ground and allowed to
float to any voltage in response to air ion imbalances. It displays the plate voltage, test
duration, and minimum and maximum peak voltages. (Nearby charge sources will also
induce a voltage on the floating plate.)
Self-tests include battery check and tests for functional errors.
Memory is non-volatile. Setup and data are retained during storage.
CAUTION
When charged, the plate voltage can be in excess of 1100 volts with respect to ground.
Although the charges and potentials are below those that are normally detected by
human senses, A SHOCK HAZARD EXISTS.
If you are handling the plate assembly or conducting a test, which involves
touching the plate, expect a shock.
Do not charge large capacitors with this device.
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