Model 541 Series Electrostatic Voltmeter

Trek Model 541 electrostatic voltmeter series are microprocessor based devices which are ideally suited to monitor critical operations associated with semiconductor, LCD, electronic assembly, and other processes where static charge accumulation poses a threat to production yields or product quality.

The Model 541 voltmeters utilize a miniature electrostatic field chopper probe which can be remotely located and easily positioned within process equipment to provide highly accurate, noncontacting, DC stable, spacing independent, voltage measurements in either ionized or non-ionized environments.

A twenty by four (20 x 4) alphanumeric LCD screen displays the present measured voltage, the positive peak voltage value, the negative peak voltage value, and additional menu information. Two specific voltage detection ranges are available. The Model 541-1 has a voltage measurement range of 0 to ±1 kV. The Model 541-2 has a measurement range of 0 to ±100 V. Both instruments have exceptional 1% accuracy and 0.1% resolution.

The Model 541 series includes independently programmable plus (+) and minus (-) voltage threshold/alarm limits to provide audible, visual, and external warning signals. Audible and visible alarms indicate the detection of programmed surface voltage limits. A relay contact output changes state when alarm thresholds are met or exceeded. This signal can be connected to a process controlling device or other equipment to monitor a particular environment.

A voltage output monitor and the 4-20 mA current loop output can provide additional signal interfacing to facility monitoring equipment. An RS-232 serial port can provide computer based control and monitoring.

The walking test adapter kit [CN 1K037 ] for the Model 541 allows analysis of charge levels accumulated on the human body per compliance with ANSI/ESD STM 97.2. and IEC Standard 61340-4-5. (click for picture)

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PERFORMANCE

• Model 541-1
  0 to ±1 kV DC or peak AC.
  
  Measurement Range:
  Model 541-2
  0 to ±100 V DC or peak AC.

  Speed of Response (10% to 90%)
  Model 541-1
  Less than 50 ms for a 1 kV step.
  Model 541-2
  Less than 50 ms for a 100 V step.

  Accuracy
  1% of full scale

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PRODUCT FEATURES

• Alphanumeric LCD Display
  Twenty character by four line (20 x 4) LCD displays present voltage, positive peak voltage, and negative peak voltage.

  Alarm Output (Digital Alarm)
  The alarm output is a logic-level output indicating the alarm status of the Model 541. 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.

  Visual Alarms
  LED's on front panel light when alarm thresholds are reached.

  Audible Alarms (ON/OFF programmable)
  A pulsating or continuous tone (selectable) is sounded when the programmed voltage limit is detected. The (+) and (-) alarms have different tone rates for the pulsed tone selection.

  Alarm Relay Output
  Form C relay contact with barrier strip terminals.  Contacts will change state when voltage thresholds are met or exceeded. The NO (normally open) contact will become closed and the NC (normally closed) contact will become open.

  Monitor Output
  Model 541-1
  The voltage output at this connector is 1/100th of the measured voltage.
  Model 541-2
  The voltage output at this connector is 1/10th of the measured voltage.
  Output Noise
  Less than 30 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital voltmeter).
  Output Impedance
  47 ohms.

  ESVM ZERO
  Control to produce zero volts when probe is coupled to a known zero source.

  Reset
  Resets the alarms (manual mode) and the Peak Hold display to zero.

  Current Output 
  Provides a current of 4-20 mA that represents -1 kV to +1 kV (Model 541-1) or -100 V to +100 V (Model 541-2).

  Serial Port 
  RS-232 controls functions and acquires sensor data through standard computer serial port.

  MENU Buttons
  Used for selecting and programming menu options. These buttons used to set alarm threshold voltages, alarm conditions, and alarm reset type.

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PROBES

Miniature electrostatic field chopper probe. End viewing and side viewing probes are available.
541P-S Probe 
Side view, square body with 3 meters cable.
541PR-E Probe 
End view, round body with 3 meters cable. 
541PR-S Probe
Side view, round body with 3 meters cable.

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ACCESSORIES

• Accessories Supplied
  • Operator’s manual, 6P/4C plug (N9056), Serial cable (BA108), Software CD-ROM (45833), Ground cord (N9044)
• Accessories Available
  • In the USA, use the Trek AC/DC Adapter #L5111 or #L5133 (with ground connection). For all other line voltages, contact the factor

  Walking Test Adapter

  • The walking test adapter kit [CN 1K037 ] for the Model 541 allows analysis of charge levels accumulated on the human body per compliance with ANSI/ESD STM 97.2. and IEC Standard 61340-4-5.
    
    The electrostatic charge and the ability for charge accumulation of a person walking on an ESD safe floor with ESD safe footwear can be measured with a walking test adapter. This test, in addition to data from standard resistance measurements, provide measurement data on the actual charge on a person while walking. This test ensures ESD safe practices are being implemented properly and that charge is being maintained under the maximum allowed voltages (typically less than 100V as per ANSI/ESD S20.20-2007, IEC 61340-5-1:2007, and IEC 61340-5-2:2007)

  
  
  Walking Test Adapter Accessory (PDF)

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GENERAL

• Dimensions
  152 mm W x 102 mm H x 216 mm D
  (6" W x 4" H x 8.5" D).

  Weight
  0.77 kg (1.7 lb).

  Power
  15 V DC ±20%, 800 mA, power buss or AC/DC adapter with a 2.1 mm DC plug.

  Operating Conditions
  Temperature
  15 °C to 35 °C.
  Relative Humidity
  5% to 85%, noncondensing.

  Power ON/OFF
  Rear panel switch.

  Ground Receptacle
  Banana jack.

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CERTIFICATION

TREK, INC. certifies that each Model 541 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.

All specifications are subject to change.

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