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TREK Model 20/20C High Voltage Amplifier

The Model 20/20C is a DC-stable, high-voltage power amplifier used in industrial and research applications such as electrostatic deflection, electrophoresis research, dielectric studies, and accelerated life-testing of high tension cables for power transmission. The Model 20/20C provides precise control of output voltages in the range of 0 to ±20 kV DC or peak AC with an output current range of 0 to ±20 mA DC or peak AC. It is configured as a noninverting amplifier with a fixed gain of 2000 V/V.

The Model 20/20C HV amplifier 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 type of output is essential to achieve an accurate output response and high slew rate demanded by a variety of loads such as highly capacitive or reactive loads.

The Model 20/20C is protected against over-voltage and over-current conditions that may be generated by active loads or by output short circuits to ground. This protection includes a user selected TRIP OFF or CURRENT LIMIT value which can be adjusted to a desired level by using a front panel potentiometer. Precision voltage and current monitors provide low-voltage representations of the high-voltage amplifier 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 Model 20/20C suitable for automated or computer controlled systems.

The Model 20/20C can be operated on a bench top or in a standard 19-inch rack.

 

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AMPLIFIER INPUT & Output

Output Voltage Range
0 to ±20 kV DC or peak AC.

Output Current Range
0 to ±20 mA DC or peak AC.
(See Automatic Power Limit feature for limitations.)

Input Voltage Range
0 to ±10 V DC or peak AC.

Input Impedance
25 kΩ, nominal.

PERFORMANCE

DC Voltage Gain
2000 V/V.

DC Voltage Gain Accuracy
Better than 0.1% of full scale.

Offset Voltage
Less than ±2 V.

Output Noise
Less than 1.5 V rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).

Slew Rate (10% to 90%, typical)
Greater than 450 V/µs.

Large Signal Bandwidth (-3dB)
DC to greater than 7.5 kHz.

Large Signal Bandwidth (1% distortion)
DC to greater than 3.75 kHz.

Small Signal Bandwidth (-3dB)
DC to greater than 20 kHz.

Settling Time (to 1%)
Less than 150 µs for a 20 kV step.

Stability

  • Drift with Time
    Less than 50 ppm/hr, noncumulative.
  • Drift with Temperature
    Less than 100 ppm/°C.

PRODUCT FEATURES

High-Voltage Amplifier On/Off
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 amplifier output. A TTL low turns on the high-voltage amplifier output.

Dynamics Adjust
A graduated one-turn panel potentiometer used to optimize the AC response of the Model 20/20C under various load conditions.

Current Limit/Trip
Switch selectable for either limit or trip. A graduated one-turn panel potentiometer is used to adjust the limit or trip level from 0 to 20 mA.

Out of Regulation Status
An indicator will illuminate and a BNC will provide a TTL low when the Model 20/20C fails to produce the required high-voltage output such as during current limit or short circuit load conditions.

Trip Status
An indicator will illuminate and a BNC will provide a TTL low when the high-voltage amplifier output is disabled due to:

  • the output current exceeding the current trip level, the detection of a high-voltage power supply fault, or the removal of the top cover.

Fault Status
A BNC will provide a TTL low when the Model 20/20C is out of regulation for greater than 500 ms.

Voltage Monitor
A buffered output providing a low-voltage replica of the high voltage output.

  • Scale
    1/2000th of the high-voltage output signal.
  • DC Accuracy
    Better than 0.1% of full scale.
  • AC Accuracy
    Calibrated against a Ross Model VD 30-4.1-BD-KC-ALU high-voltage divider.
  • Offset Voltage
    Less than ±2 mV.
  • Output Noise
    Less than 10 mV rms (measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter).
  • Output Impedance
    47 Ω.

Current Monitor
A buffered output providing 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 Ω.

Automatic Power Limit
Automatically limits the output power to protect the Model 20/20C from overheating due to excessive internal power dissipation. The following graph illustrates the Model 20/20C operating range automatic power limits.

GENERAL

Dimensions
279 mm H x 482 mm W x 654 mm D
(11" H x 19" W x 25.75" 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
16 A at 230 V AC or 20 A at 125 V AC.

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.


ACCESSORIES SUPPLIED

Operator’s manual, Caton 5 m (16 ft) high-voltage output cable assembly, and line cord.

CERTIFICATION & COMPLIANCE

Certification
TREK, INC. certifies that each Model 20/20C 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.

Low-Voltage Safety Compliance (EN 61010-1)

Installation Category
CAT II: Local level mains, appliances, portable equipment.
Pollution Category
Degree 1: Operate in environments where no pollution or only dry, nonconductive pollution occurs.

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

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