Monroe 268A Charge Plate Analyzer
• Meets ESD Association Standard ANSI / ESD STM 3.1
• Removable, cable-connected plate/probe permits precise positioning and remote monitoring
• Separate time and voltage displays for decay rate analysis
• Recorder output for permanent records and unattended operation
• Two ranges measure from 0 to ±5kV
• Dramatically demonstrates induced charges and human body potentia
The model 268A is the most affordable charged-plate monitor available. It is suited to test all types of ionization systems according to ESD Association standard S3.1. It features 1 kV and 5 kV charging ranges for testing ionization systems or for testing ESD control materials.
It’s ability to display peak positive and negative offset voltage swings make it the ideal tool to quickly and accurately balance pulsed-DC ionization systems. The detachable ion collecting plate can be placed at the work height or placed within process equipment to evaluate ionizers while in use. Model 268A-1T incorporates an adjustable stop voltage for decay tests to accommodate specialized needs. This option allows the user to set the timer stop voltage at any level from 0 V to 1000 V.
Charged Plate/Probe Assembly
Capacitance of total discharge test circuit with plate:
20 ±2 picofarads
Plate self-discharge rate:
<10% at 1 KV within 5 minutes
6 x 6 inches (15.2 x 15.2 cm)
Available plate charging voltages:
±1000 V and ±5000 V, continuously adjustable from 1100 to >5000 V
0 to ±5000 V, 0 to ±2000 V
Better than 2%
<0.4% per hour, noncumulative after 10 minutes stabilization, TYP.
Speed of response:
<100 msec from 10% to 90% of full scale in either range
1/1000 of plate voltage
1.0 kV/100 V or 5.0 kV/500 V (user selectable)
Max time measured:
999.9 sec (16 minutes +)
117 or 220 VAC ±10%, 50/60 Hz (factory preset), 5 watts
6¾ x 6¾ x 9½ inches (17 x 17 x 24cm)
5.5 lbs (2.3 kg)
Two operating modes cover all types of ionization systems.
For room and table-top ionization systems, laminar flow hoods, and air guns and nozzles the normal (discharge) mode provides both static decay timing and system balance monitoring.
For pulsed DC ionization systems the peak mode monitors voltage swings by reading and holding the peak voltage and polarity (positive or negative) sensed on the charged plate/potential.