Trek 30-20A User Manual

Trek Model 30/20A

High-Voltage Power Amplifier

The Model 30/20A is a DC-stable, high-voltage power amplifier featuring an all solid-state design for high slew
rate, wide bandwidth, and low-noise operation. t is configured as noninverting with a fixed gain of 3000 V/V and

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 4-quadrant, active output stage sinks or sources current to reactive or resistive loads throughout the
output voltage range. This is essential to achieve the accurate output response and high slew rates demanded
by reactive loads.

Key Specifications

! Output Voltage Range:
! Output Current Range: peak AC

! Slew Rate: Greater than 550 V/

Large Signal Bandwidth DC to greater than 2.5 kHz

!

(2% distortion):
DC Voltage Gain: 3000 V/V

!

0 to ±30 kV DC or peak AC
0 to ±20 mA DC or

µs

Typical Applications Include

! Dielectric studies
! Electron beam ion traps and ion sourcing
! Electrospinning
! Electrostatic deflection (including ion beam steering)
! Electrostatic flame control
! Electrostatic levitation
! Electrostatic precipitation
! High-voltage cable testing
! High-voltage component testing
! Plasma studies (including dielectric barrier discharge)

Features and Benefits

! Four-quadrant output for driving capacitive loads

Closed loop system for high accuracy

!

Short-circuit protected for equipment protection

!

All solid-state design for maintenance free operation

!

DC-stable for programmable supply applications

!

Low output noise for ultra-accurate outputs

!

NIST-traceable Certificate of Calibration provided with each unit

!

compliant

!

TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK

(fax) • www.trekinc.com • [e-mail] 716-438-7555 • 716-201-1804

Features (cont.)

High-Voltage On/Off

Local

Individual push-button switches

Remote

TTL compatible input. TTL high (or open) turns
off high-voltage output. TTL low turns on high­voltage output.

Current Limit/Trip

Switch selectable for limit or trip. Graduated 1­turn panel potentiometer is used to adjust limit
or trip level from 0 to ±20 mA.

Out of Regulation
Status Indicator and
Connnector

Illuminates and TTL low is provided when unit
fails to produce required HV output such as
during current limit.

Limit/Trip Status
Indicator and
Connector

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 high­voltage supply fault, the removal of one of the
panels, or if the Model 30/20A is out of
regulation for greater than 500 ms.

Mechanical

Dimensions

103.9 cm H x 43 cm W x 87 cm D
(40.9” H x 17” W x 34” D) Depth dimension
includes wheels, handles and spacing for air
flow.

Weight

73 kg (160 lb) approximate

HV Connector

Caton high-voltage Connector

BNC Connectors

Amplifier Input, Voltage Monitor, Current Monitor,
Remote High Voltage ON/OFF, Out of Regulation
Status, Fault/Trip Status

Operating Conditions

Temperature

0°C to 40°C (32°F to 104°F)

Relative Humidity

To 75%, noncondensing

Altitude

To 1524 meters (5000 ft.)

Electrical

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

1800 VA, maximum

AC Line Receptacle

Standard 3-prong with integral fuse holder

Supplied Accessories

Operators Manual

PN: 23343

Shorting BNC Cap

PN: B3060

HV Output Cable

PN: 43466

Line Cord, Fuses

Selected per geographic destination

Locking Wheel Kit

CN: 1K042

Model 30/20A Specifications

Performance

Output Voltage
Range

0 to ±30 kV DC or peak AC

Output Current
Range

0 to ±20 mA DC or peak AC
Input Voltage Range

0 to ±10 V DC or peak AC

Input Impedance

25 kW nominal (inverting/differential option
50 kW, nominal)

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 1.5 V rms*

Slew Rate
(10% to 90%, typical)

Greater than 550 V/µs

Small Signal
Bandwidth (-3dB)

DC to greater than 30 kHz

Large Signal
Bandwidth
(2% distortion)

DC to greater than 2.5 kHz

Stability

Drift with Time

Less than 50 ppm/hr, noncumulative

Drift with

Temperature-

Less than 100 ppm/°C

Voltage Monitor

Ratio

1 V / 3000 V

DC Accuracy

Better than 0.1% of full scale

DC Offset Voltage

Less than ±5 mV

Output Noise

Less than 20 mV rms*

Output Impedance

47 W

Current Monitor

Ratio

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*

Bandwidth (-3dB)

DC to greater than 5 kHz

Output Impedance

47 W

Features

Settling Time (to 1%)

Less than 200 µs for a 0-30 kV step

Dynamic Adjustment

Graduated 1-turn panel potentiometer is used
to optimize the AC response for various load
parameters.

*Measured using the true rms feature of the Hewlett Packard Model 34401A digital multimeter

Measurement and Power Solutions

Copyright ã 2013 TREK, INC. All specifications are subject to change. 1330/JRB

TM