High Voltage Power Amplifiers


TREK Model P0621P high voltage power amplifier

Trek Model P0621P is a DC-stable, high-voltage power amplifier designed to provide precise control of output voltages in the range of 0 to +30 kV DC or peak AC, with an output current capability of 0 to ±20 mA DC or peak AC. This amplifier is configured as a noninverting amplifier with a fixed gain of 3000 V/V. Industrial and research applications include electrostatic scanning, pulsed field electrophoresis, and poling of materials.

The Model P0621P features an all solid-state design, 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. P0621P is protected against over-voltage and over-current conditions that may be generated by active loads or by output short circuits to ground.

Precision voltage and current monitors provide buffered 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 On/Off feature provides a connection for a remote device to turn on and off the high voltage of the instrument. This makes the P0621P suitable for automated or computer controlled systems.

 


 

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AMPLIFIER INPUT & Output

  • Input Voltage Range
    0 to +10 V DC or peak AC.
  • Input Impedance
    50 kohm, nominal.
  • Output Voltage Range
    0 to +30 kV DC or peak AC.
  • Output Current Range
    0 to ±20 mA DC or peak AC
    (see Automatic Power Limit feature for limitations).

PERFORMANCE

  • DC Voltage Gain
    3000 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 (1% Distortion)
    DC to greater than 3.5 kHz.
  • Small Signal Bandwidth (-3dB)
    DC to greater than 25 kHz.
  • Stability
    • Drift with Time
      Less than 100 ppm/hr, noncumulative.
    • Drift with Temperature
      Less than 100 ppm/°C.
  • Settling Time (to 1%)
    Less than 250 µs for a 0 to 30 kV step.
  • Automatic Power Limit
    Automatically limits the internal power dissipation to protect the Model P0621P from overheating. The following graph illustrates the Model P0621P automatic output power limit range (at ±20 mA current limit potentiometer setting).
  • Model P0621P Output Operating Range

 

 

 

PRODUCT FEATURES

  • High-Voltage On/Off
    Switch selectable for either local or remote control.
    • Local
      Individual push buttons.
    • 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.
  • Dynamic Adjustment
    A graduated one-turn potentiometer used to optimize the AC response of the P0621P under various load parameters.
  • Current Limit/Trip
    Switch selectable for either limit or trip. A graduated one- turn potentiometer is used to adjust the limit or trip level from 0 to 20 mA.
  • Out Of Regulation Status
    A yellow indicator will illuminate and a BNC will provide a TTL low when the P0621P fails to produce the required high-voltage output such as during current 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 or by the removal of the top cover.
  • Fault Status
    A BNC will provide a TTL low when the P0621P is in out of regulation for greater than 500 ms.
  • Voltage Monitor
    A buffered output provides a low-voltage replica of the high voltage output.
    • Scale
      1/3000th 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.

  • ACCESSORIES SUPPLIED

    Operator's manual, Caton 5 m (16 ft) high-voltage output cable assembly, and line cord.
  • Current Monitor
    A buffered output provides a low-voltage representation of the load current.
    • Scale
      0.5 V/mA.
    • DC Accuracy
      Better than 1% 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 10 kHz.
    • Output Impedance
      47 ohms.

GENERAL

  • Dimensions
    222 mm H x 432 mm W x 584 mm D
    (8.75" H x 17" W x 23" D).
  • Weight
    24.9 kg (55 lb).
  • 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 On/Off 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
      Factory set for one of two ranges,
      104 to 127 V AC or 180 to 250 V AC, at 48 to 63 Hz (specify when ordering).
  • Power Consumption
    1000 VA, maximum.
  • Operating Conditions
    • Temperature
      0 °C to 40 °C.
    • Relative Humidity
      To 75%, noncondensing.

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