Celebrating 40 Years of Innovation: 1968-2008

Products: High Voltage Power Amplifiers

TREK Model 40/15 High-Voltage Amplifier

The Model 40/15 is a DC-stable, high-voltage power amplifier designed to provide precise control of output voltages in the range of 0 to ±40 kV DC or peak AC with an output current range of 0 to ±15 mA DC or peak AC. The amplifier is configured as noninverting with a fixed gain of 4000 V/V. Inverting and differential input options are available. A potentiometer with a calibrated dial and polarity switch provides a DC offset over a range of 0 to ±40 kV DC.

Industrial and research applications include dielectric studies, electrostatic deflection, and electrooptic modulation.

The Model 40/15 features an all solid-state design for high slew rate, wide bandwidth, and low-noise operation. The four-quadrant, active output stage sinks or sources current into reactive or resistive loads throughout the output voltage range. This is essential for achieving the accurate output response and high slew rates demanded by reactive loads.

The Model 40/15 is protected against overvoltage and overcurrent conditions that may be generated by active loads or by output short circuits to ground. Precision voltage and current monitors provide low-voltage representations of the high-voltage output and load current for monitoring purposes or for use as feedback signals in a closed-loop system. The Remote High Voltage Enable feature provides a connection for a remote device to turn on and off the high voltage of the instrument. This makes the 40/15 useful for automated or computer controlled systems.

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AMPLIFIER INPUT & Output

  • Input Signal Voltage Range
    0 to ±10 V DC or peak AC.
    Inverting and differential options are available.

    Input Impedance
    25 kohm, nominal (noninverting).
    Inverting and differential option 50 kohm, nominal.

  • Output Voltage Range
    0 to ±40 kV DC or peak AC.

    Output Current Range
    0 to ±15 mA DC or peak AC.
    See Automatic Power Limit feature for limitations.

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PERFORMANCE

  • DC Voltage Gain
    4000 V/V.
  • DC Voltage Gain Accuracy
    Better than 0.1% of full scale.
  • Offset Voltage
    Less than ±4 V.
  • Output Noise
    Less than 5 V rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
  • Slew Rate (10% to 90%, typical)
    Greater than 350 V/µs.
  • Large Signal Bandwidth (2% Distortion)
    DC to greater than 1.4 kHz.
  • Small Signal Bandwidth (-3dB)
    DC to greater than 20 kHz.
  • Stability
    • Drift with Time
      Less than 50 ppm/hr, noncumulative.
    • Drift with Temperature
      Less than 100 ppm/°C.
  • Settling Time (to 1%)
    Less than 200 µs for a 0 to 40 kV step.
  • Automatic Power Limit
    Automatically limits the internal power dissipation to protect the Model 40/15 from overheating. The following graph illustrates the Model 40/15 automatic output power limit range.
  • Model 40/15 Output Operating Range

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PRODUCT FEATURES

  • DC Offset Voltage Adjustment
    A potentiometer with a calibrated dial adjusts the level of the DC offset voltage from 0 to ±40 kV DC. A three (3) position switch determines positive polarity, negative polarity, or switches the DC bias voltage off.
  • High-Voltage Enable
    Switch selectable for either local or remote control.
    • Local
      Individual push-button switches.
    • Remote
      A TTL compatible input. A TTL high (or open) turns off the high-voltage output. A TTL low turns on the high-voltage output.
  • Dynamics Adjust
    A graduated one-turn panel potentiometer is used to optimize the AC response of the Model 40/15 for various load parameters.
  • Current Limit/Trip
    Switch selectable for either current limit or trip. A graduated one-turn potentiometer is used to adjust the limit/ trip level from 0 to ±15 mA.
  • Out Of Regulation Status
    An indicator will illuminate and a BNC will provide a TTL low when the Model 40/15 fails to produce the required high-voltage output such as during current limit.
  • Limit/Trip Status
    An indicator will illuminate and a BNC will provide a TTL low when the high-voltage output is disabled due to the output current exceeding the current trip level, the detection of a high-voltage power supply fault, removal of one of the panels, or if the Model 40/15 is in an out of regulation status for greater than 500 ms.
  • Settling Time (to 1%)
    Less than 200 us for a 0 to 40 kV step.
  • Voltage Monitor
    A BNC buffered output provides a low-voltage replica of the high voltage output.
    • Scale
      1/4000th of the high-voltage output signal.
    • DC Accuracy
      Better than 0.1% of full scale.
    • Offset Voltage
      Less than ±2 mV.
    • Output Noise
      Less than 20 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
    • Output Impedance
      47 ohms.
  • Current Monitor
    A buffered voltage output provides a representation of the load current.
    • Scale
      0.5 V/mA.
    • DC Accuracy
      Better than 2% of full scale.
    • Offset Voltage
      Less than ±10 mV.
    • Output Noise
      Less than 30 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
    • Bandwidth (-3db)
      DC to greater than 5 kHz.
    • Output Impedance
      47 ohms.

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GENERAL

  • Dimensions
    1239 mm H x 578 mm W x 893 mm D
    (49" H x 22.8" W x 35" D).
    Depth dimension includes handles and 200 mm (8") of spacing bars to insure proper airflow to the fans on the unit.
  • Weight
    100 kg (220 lb) approximate.
  • High-Voltage Output Connector
    Caton high-voltage connector.
  • Amplifier Input
    BNC connector.
  • Voltage Monitor Connector
    BNC connector.
  • Current Monitor Connector
    BNC connector.
  • Remote High-Voltage Enable Connector
    BNC connector.
  • Out of Regulation Status Connector
    BNC connector.
  • Fault/Trip Status Connector
    BNC connector.
  • AC Line Receptacle
    Standard three-prong AC line connector.
  • Power Requirements
    • Line Voltage
      180 to 250 V AC, at 48 to 63 Hz.
    • Power Consumption
      1800 VA maximum.
  • Operating Conditions
    • Temperature
      0 °C to 40 °C.
    • Relative Humidity
      To 75%, noncondensing.
    • Altitude
      To 5000 ft.

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ACCESSORIES SUPPLIED

Operator’s manual, 3 m (10 ft) high-voltage output cable assembly, line cord.

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CERTIFICATION

TREK, INC. certifies that each Model Model 40/15 is tested and calibrated to specifications using measurement equipment traceable to the National Institute of Standards and Technology or traceable to consensus standards.


All specifications are with no load unless otherwise noted and are subject to change.

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