TREK Product - Model 540 Electrostatic Monitor/Static Meter

Products: Electrostatic Voltmeter Sensors & Monitors

TREK Model 540

Trek Model 540 Series
Performance
Product Features
General
Certification

Model 540 Electrostatic Monitor/Static Meter

The Trek Model 540 is a versatile microprocessor based electrostatic monitor which is ideally suited to monitor the performance of air ionizers that are used in critical operations associated with semiconductor, LCD, electronic assembly, and other processes where static charge accumulations pose a threat to production yields and/or product quality.

The Model 540 utilizes a new technique which requires less than 0.1 picoampere of ion current to achieve full accuracy and stability. Other product designs require up to 2000 times more ion current to be unnecessarily wasted from the ion fields. The ultra sensitivity of the Model 540 makes this product the only choice in air ionizer monitor applications where small area ion collecting sensors are used to meet the requirement for high accuracy ion balance measurement to levels of less than one volt.

Using either an ion plate or antenna sensor, the Model 540 can easily detect the presence of charged objects while presenting a self-discharge rate of less than 0.1 volt/second.

An analog voltage output provides a signal for a facility monitoring system or for use as a feedback signal to control the ion balance of the ionizer. An optional 4-20 mA current output is available to transmit data over long distances in noisy environments.

The Model 540 features a DPM and a bar graph display for local presentation of the sensor voltage. An alarm provides audible and visual warnings when the sensor voltage exceeds preset thresholds. Independent alarm thresholds can be set with 1 volt resolution for both positive and negative polarities.

PERFORMANCE

Monitored Voltage Range
0 to ±100 V DC or peak AC.

Voltage Measurement Accuracy
0.2% of full scale.

Large Signal Bandwidth (1% distortion)
DC to greater than 200 Hz.

Small Signal Bandwidth (-3 dB)
DC to 2.5 kHz.

Stability
(referred to floating plate voltage)
Drift with Time (no incident ion flow)
Less than 32 mV/s.
Drift with Time (with incident ion flow)
Negligible.
Drift with Temperature
Less than 50 mV/°C.

Floating Plate Self-Discharge Rate
Less than 2 V per minute at 100 V for relative humidity up to 65%.

Floating Plate Capacitance to Ground
Maintained at 20 pF ± 5 pF. Capacitance is independent of floating plate connecting cable length.

PRODUCT FEATURES

3 1/2 Digit Voltage Display
Displays precise voltage at plate/antenna to 100.0 V.
Display Accuracy
0.2% of full scale, ±1 count, referenced to output monitor.
Display Resolution
0.1V.
LED Bar Graph Voltage Display
A red LED for each of the following voltages:
-100V, -80V, -60V, -40V, -30V, -20V, -10V, -5V, -4V, -3V, -2V, -1V, 0V (green LED), +1V, +2V, +3V, +4V, +5V, +10V, +20V, +30V, +40V, +60V, +80V, +100V. The present voltage value is indicated by illumination of all LEDs from zero to the present voltage value.

Peak-hold
The most positive voltage and most negative voltage measured will cause that particular LED to remain illuminated to indicate peak measured values. The peak-hold LEDs are reset by the Alarm Reset.

Alarm Output (Digital Alarm)
The terminal block alarm output is a logic-level output indicating the alarm status of the Model 540. A TTL low (0 to 0.8 volts) signals an alarm condition. A TTL high (2.5 to 5.0 volts) indicates a normal condition.

Output Monitor
The voltage at this connector is 1/10th or 1/20th (customer specified) of the measured plate voltage. (Factory set for 1/20th.) Other scale ratios are available.
Accuracy
0.2% of full scale.

Current Output (optional)
Provides a current of +4 mA to +20 mA that represents -100 to +100 volts.

Visible Alarm Indicators
Separate LEDs for positive and negative alarm limit indication. ALARM LEDs flash when the programmed alarm threshold voltages are reached.

Audible Alarms
A pulsating tone is sounded when the programmed voltage limit is detected. Different tone rates are used for the (+) and (-) alarms. Audio alarms can be disabled.

Reset Button
Reset button zeros the floating plate/antenna sensor and resets the peak-hold indicators. The alarms (visual and audible) can be user programmed to reset either automatically, upon the measured value falling below the threshold value, or upon manual reset.

Ground Connector
Banana jack.

Alarm Limit Programming
The positive and negative alarm limit thresholds can be independently programmed over the range of 1 volt to 100 volts in 1-volt increments.

Sensor Type (ordered separately)
Collecting Plate (Trek Model 540P)
25 mm x 25 mm (1" x 1").
Antenna Sensor
Can be attached in place of the floating plate sensor.

GENERAL

Dimensions
120 mm W x 71 mm H x 140 mm D
(4.75" W x 2.8" H x 5.5" D).
Weight
0.6 kg (1.4 lb).

Power
The Model 540 requires an AC adapter with a 2.1 mm DC power plug to supply +12 V DC minimum to +18 V DC maximum, at 500 mA. Other voltage inputs are optionally available.

Plate/Antenna Input Connector
BNC connector.

Operating Conditions
Temperature
5 °C to 35 °C.
Relative Humidity
To 85%, noncondensing.

CERTIFICATION

TREK, INC. certifies that each Model 540 is 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.

Caution: These instruments are designed to make electrostatic voltage measurements only. Do not use these instruments to make measurements of “hard” voltage sources or voltage sources which can deliver currents high enough to cause harmful shocks or personal injury.