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Charged Plate Monitor "Trek" Model 156A

Charged Plate Monitor – Model 156A


The Model 156A Charged-Plate Monitor is an important tool for evaluating the performance of air

ionizers used to neutralize static charges. The Model 156A tests the efficiency of an ionizer’s ion production

by timing how long it takes air ions produced to discharge a floating plate that has been pre-charged

to either a positive or negative value. The Model 156A also tests the balance between positive and

negative air ions by measuring the offset voltage generated on a floating plate due to an imbalance of

positive and negative air ions impinging on the plate from the ionizer.



§  ESD monitoring of sensitive manufacturing processes such as semiconductor, disk drive and LCD.

§  Testing of all types of ionizers, including room ionization systems, AC and DC blowers, nuclear ionizers, gun type ionizers, and pulsed DC ionizers.

§  High temperature applications.

§  ESD measurement of de-ionized water.

§  Dissipative testing applications.


At a Glance

Large Signal Bandwidth:

DC to 10 Hz

Decay Mode Thresholds:

User selectable for 10 V or 100 V, +/-2%.

Start/Stop Voltages:

Programmable from 1 to +/-1000 V in 1 V increments

Start/Stop Accuracy:

Within +/-1 V of programmed voltage



Mode Select

A three-position toggle switch selects the +Decay, -Decay, or Float mode of operation. This switch is also used in combination with the Test/Reset Control switch to program the START and STOP volltages.

Test/ Reset Control

A momentary toggle switch used in conjunction with the Mode Select switch to program the START and STOP voltages

+Decay and –Decay Modes

Sets the plate voltage to a value greater than the programmed start voltage and resets the decay timer to zero

Float Mode

Sets the plate voltage to 0 V +/- 2 V

Plate Voltage Digital

Panel Meter

3.5 digit red LED display


0 to +/-1100 V


1 V


Better than 0.1% of full scale +/-1 count

Decay Time Digital

Panel Meter

4-digit red LED display


0 to 9999 seconds


Mechanical Specifications

Dimensions (H x W x D)

83 x  318 x 280 mm (3.25 x 12.5 x 11 in)


2 kg (4.4 lb)


Voltage Monitor

BNC Connector

Ground Receptacle

Banana Jack

Cable 156A to Plate

Coaxial (3 m length, 4.95 mm diameter)


Environmental Specifications


5 to 35°C (41 to 95°F)

Relative Humidity

To 80% RH, noncondensing


To 2000 m (6561.68 ft.)




This product was added to our catalog on Monday 11 March, 2024.
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Nanomachinery Co., Ltd.
4, Soi Petchkasem 100 ,Phetchkasem Rd. ,Bangkaenue ,Bangkae ,Bangkok, 10160, THAILAND.
Tel : 086-322-6876 ,02-421-9927 ,Fax : 02-809-2591 E-mail : pongthorn@nano-machinery.com
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