TREK Product - Model 156A & Model 156A/1 CHARGED-PLATE MONITOR

Products: Charged Plate Monitors

TREK Model 156A & 156A/1

Trek Model 156A & 156A/1 Info
Performance
Product Features
Hardware Requirements
Ion Collecting Plates
Accessories
General
Certification

Model 156A & Model 156A/1 CHARGED-PLATE MONITOR

The Trek Model 156A Charged-Plate Monitor System is designed to provide quantitative measurements of the effectiveness of air ionization systems, as to audit ionizer performance.

The Model 156A employs a revolutionary charged-plate monitor design that utilizes an ultrahigh-impedance, high-voltage follower to monitor the ion collecting plate voltage. This technique provides very high accuracy and virtually infinite impedance loading of the plate, while allowing the ion collecting plate to be charged and monitored through the same small-diameter connection. This technique also makes the measurement capacitance independent of the physical size and shape of the ion plate. Therefore, the size and shape of an ion collecting plate, as well as the measurement capacitance, may be customer specified to match a particular ESD-sensitive device within a manufacturing process, or it may be made to conform to the EOS/ESD Association Standard STM3.1-2000.

The Model 156A features two modes of operation, a decay mode with easy-to-program start and stop voltages, and a float mode. For decay mode operation, the ion collecting plate is precharged to a level above the programmed START voltage. The time required to discharge the ion collecting plate from the programmed START voltage to the programmed STOP voltage due to incident ion flow to the ion collecting plate from the measured ion field is indicated by the Model 156A. In the float mode of operation, the plate is initially discharged to zero and then allowed to float to the voltage level dictated by incident ion flow to the ion collecting plate from the measured ion field.

The simplicity of the design of the Model 156A makes it very reliable and completely portable. The Model 156A is powered by an internal rechargeable battery that offers 8 hours of operation from a full charge.

The Trek Model 156A/1 has a serial interface port to connect with a computer. Computer Software allows the operator to program test sequences, save, or retrieve test results. Any series of tests can be duplicated, analyzed, programmed or retrieved using PC based software.

PERFORMANCE

Monitored Voltage Range
0 to ±1100 V DC or peak AC.
Small Signal Bandwidth (-3 dB)
DC to 1 kHz (measured at 20 V p-p).
Large Signal Bandwidth
DC to 10 Hz (measured at 2000 V p-p).
Zero Stability (referred to plate voltage)
Drift with Time (no incident ion flow)
Less than 6 V/minute.
Drift with Temperature
Less than 10 mV/°C, noncumulative.
Decay Mode Thresholds

Start Voltage
156A unit,156A/1 unit and software programmable from 1 to ±1000 V in 1 V increments.
Start Accuracy
156A unit,156A/1 unit and software within ±1 V of programmed start voltage.
Stop Voltage
156A unit,156A/1 unit and software software programmable from 0 to ±999 V in 1 V increments.
Stop Accuracy
156A unit,156A/1 unit and software within ±1 V of programmed stop voltage.

Plate Self-Discharge (unpolarized)
Less than 12 V/minute.

PRODUCT FEATURES

Mode Select
A three-position toggle switch that selects the +Decay, the -Decay, or the Float mode of operation. This switch is also used in combination with the Test/Reset Control switch to program the START and STOP voltages.
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.
Voltage Monitor Output
A BNC providing a low voltage replica of the plate voltage.
- Scale
  1/200th of the plate voltage.
- DC Accuracy
  Better than 0.1% of full scale.
- Offset Voltage
  Less than ±10 mV.
- Output Noise
  Less than 10 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
- Output Impedance
  Less than 0.1 ohm.Plate Voltage
Digital Panel Meter
3 1/2 digit red LED display.
- Range
  0 to ±1100 V.
- Resolution
  1 volt.
- Accuracy
  Better than 0.1% of full scale, ±1 count.
Decay Time Digital Panel Meter
4-digit red LED display.
- Range
  0 to 9999 seconds.
- Resolution
  0.1 seconds, from 0.1 to 999.9 seconds;
  1 second, from 1000 to 9999 seconds.
  (The display will indicate "- - - -" when the decay time exceeds 9999 seconds.)
Power On/Off
A two-position rocker switch.

HARDWARE REQUIREMENTS

PC compatible computer, 486DX66 or better, Windows 95 or 98, 16 Mb of RAM, and a high speed communications port (16550 or equivalent UART).Serial Port Connector (156A/1 only)
25 pin receptacle on unit for connection to a high speed communications port (16550 or equivalent UART) for the computer interface.

ION COLLECTING PLATES

Standard Option
Meets ESD Association Standard ANSI/ESD-STM3.1 requirements for:
- Dimensions
  15.3 cm x 15.3 cm square, (6" x 6" square).
- Capacitance
  20 pF ±2 pF.
Non-standard Option
- Dimensions
  Specify when ordering.
- Capacitance
  Specify when ordering.
High Temperature Ion Collecting Plates
- Model 156P-HT 150mm x 150mm Charge Plate
  - Dimensions
    15.3 cm x 15.3 cm square, (6" x 6" square) ion collecting plate
  - Cable Length
    2.7 meters
  - Capacitance
    20 pF ±5 pF
  - Operating range
    -60° to 160°
  - Relative Humidity
    To 85%, noncondensing
- Model PD04002AP
  - Dimensions
    25 mm x 25 mm (1" x 1") ion collecting plate
  - Cable Length
    3 meters
  - Capacitance
    20 pF ±5 pF
  - Operating Range
    -60° to 160° C
  - Relative Humidity
    To 85%, noncondensing
Standard Plates (ordered separately) include 15.3 cm x 15.3 cm (6" x 6" square) plate (Model 156AP-C150x150-R3M) and a 25 mm x 25 mm (1" x 1") plate (Model 156P-C25x25-S3M).

Special Plates can be ordered separately. Custom plate sizes are available by special order.

ACCESSORIES

Accessories Supplied
- Operator’s manual for unit, PC based computer software (156A/1 only), and a 2.7 meter (9 ft.) stackable banana to banana cord.
- A computer communications cable for the 156A/1. The cable is a 25 pin (plug) from unit to a 9 pin or 25 pin (receptacle) which connects to a PC laptop or desktop computer.
Accessories Available
- Battery Eliminator/Charger (115 V AC), International AC Adapter Kit (100 to 240 V AC), Ion Collecting Plate Tripod, and Carrying Case.

GENERAL

Power Requirements
Battery Eliminator/Charger
Available for all nominal line voltages.
Output Connector
2.1 mm DC power plug.
Battery Operation
Rechargeable battery, supplied.
Operating Time
More than 8 hours from a full charge (156A).
More than 6 hours from a full charge (156A/1).
Recharge Time
3 hours to full charge.
Other
Low battery indicator.
Full charge indicator.
Operating Conditions
- Temperature
  5 °C to 35 °C.
  Relative Humidity
  To 80%, noncondensing.Instrument
- Dimensions
  83 mm H x 318 mm W x 280 mm D
  (3.25" H x 12.5" W x 11" D).
Instrument Weight
Approx. 2 kg (4.4 lb).
Voltage Monitor Connector
BNC coaxial connector.
Ground Receptacle
Banana jack.
Cable from Instrument to Floating Plate
Coaxial type.
Diameter
4.95 mm (0.195").
Length
3 meters (10 ft), nominal.

CERTIFICATION

TREK, INC. certifies that each Model 156A and Model 156A/1 are tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards A Certificate of Calibration accompanies each instrument when it is shipped from the factory.

All specifications are subject to change.