TREK Product - Model 50/12 High Voltage Amplifier

TREK Model 50/12 High Voltage Amplifier

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The Model 50/12 is a DC-stable, high-voltage power amplifier designed to provide precise control of output voltages in the range of 0 to ±50 kV DC or peak AC with an output current range of 0 to ±12 mA DC or peak AC. The amplifier is configured as noninverting with a fixed gain of 5000 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 ±50 kV DC.

Industrial and research applications include dielectric studies, electron beam ion traps & ion sources, electrospinning, electrostatic deflection (including ion beam steering), electrostatic flame control, electrostatic levitation, electrostatic precipitation, high-voltage cable testing, high-voltage component testing and plasma studies (including dielectric barrier discharge).

The Model 50/12 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 50/12 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 50/12 useful for automated or computer controlled systems.

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Output

Output Voltage Range
0 to ±50 kV DC or peak AC.

Output Current Range
0 to ±12 mA DC or peak AC
(see Automatic Power Limit feature for limitations).

Amplifier Input

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

Input Impedance
25 kΩ, nominal
(Inverting/differential option 50 kW, nominal).

Features

DC Offset Voltage Adjustment
A potentiometer with a calibrated dial adjusts the level of the DC offset voltage from 0 to 50 kV DC. A three (3) position switch selects positive polarity, negative polarity, or 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.

Current Limit/Trip
A switch selectable for either current limit or current trip. A graduated one-turn panel potentiometer is used to adjust the limit/trip level from 0 to ±12 mA.

Out of Regulation Status
An indicator will illuminate and a BNC will provide a TTL low when the Model 50/12 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 supply fault, the removal of one of the panels, or if the Model 50/12 is in an out of regulation status for greater than 500 ms.

Settling Time (to 1%)
Less than 200 µs for a 0 to 50 kV step.

Features (cont.)

Dynamics Adjust
A graduated one-turn panel potentiometer is used to optimize the AC response of the Model 50/12 for various load parameters.

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

Scale Factor
The voltage monitor output voltage scaling factor is 1/5000 V of the output voltage.

DC Accuracy
Better than 0.1% of full scale.

Offset Voltage
Less than ±4 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 Ω.

Current Monitor
A buffered output provides a low-voltage representation of the load current.

Scale Factor
0.5 V/mA.

DC Accuracy
Better than 2 % of full scale.

Offset Voltage
Less than ±10 mV.

Output Noise
Less than 50 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 Ω.

Performance

DC Voltage Gain
5000 V/V.

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

Offset Voltage
Less than ±5 V.

Output Noise
Less than 10 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.

Automatic Power Limit
Automatically limits the internal power dissipation to protect the Model 50/12 from overheating. The following graph illustrates the AC and DC automatic power limit output capability.

General

Dimensions
1473 mm H x 629 mm W x 948 mm D
(58” H x 25" W x 37" D).
Depth dimension includes handles and 20 cm (8") of spacing bars to insure proper airflow to the fans on the unit.

Weight
125 to 136 kg (275 to 300 lb).

High-Voltage Output Connector
High-voltage connector.

BNC Connectors
Amplifier Input
Voltage Monitor
Current Monitor
Remote High-Voltage Enable
Out of Regulation Status
Limit/Trip Status connector

Power Requirements

Line Voltage
180 to 250 V AC, at 48 to 63 Hz
Power Consumption
1800 VA, maximum.

AC Line Receptacle

Standard three-prong AC line connector.

Products > Amplifiers > Greater than 5 kV