Trek 20-20C User Manual
Trek Model 20/20C
High-Voltage Power Amplifier
The Model 20/20C is a DC-stable, high-voltage power
amplifier used in industrial and research applications. It
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. It is configured as a non-inverting
amplifier.
Key Specifications
! Output Voltage Range:
! Output Current Range: peak AC
! Slew Rate: Greater than 450 V/
!
Large Signal Bandwidth (-3 dB): DC to greater than 7.5 kHz
!
DC Voltage Gain: Fixed at 2000 V/V
0 to ±20 kV DC or peak AC
0 to ±20 mA DC or
µs
Typical Applications Include
! Electrostatic deflection
! Electrophoresis
! Electrorheological fluids
! Electro-optic modulation
! Material poling
! AC or DC biasing
! Ion beam steering
! Particle accelerators
! Mass spectrometers
! Material characterization
! Ferroelectrics
! Atmospheric plasma
! 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
CE compliant for assured reliability
!
All solid-state design for maintenance free operation
!
DC-stable for programmable supply applications
!
Low output noise for ultra-accurate outputs
!
TREK, INC. • 190 Walnut Street • Lockport, NY 14094 • USA • 800-FOR TREK
(fax) • www.trekinc.com • sales@trekinc.com 716-438-7555 • 716-201-1804
Features (cont.)
Dynamic Adjustment
Graduated 1-turn panel potentiometer is used
to optimize the AC response for various load
parameters
Current Limit/Trip
Switch selectable for either limit or trip.
Graduated 1-turn panel potentiometer is used
to adjust limit or trip level from 0 to ±20 mA
Out of Regulation
Status
Illuminates and a TTL low is provided when unit
fails to produce required HV output such as
during current limit or short circuit load
conditions
Trip Status
Illuminates and a TTL low is provided 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 or
the removal of the top cover
Fault Status
A BNC provides a TTL low when the Model
20/20C is out of regulation for greater than
500 ms
Mechanical
Dimensions
279 mm H x 482 mm W 654 mm D
(11” H x 19” W x 25.75” D)
Weight
24.9 kg (55 lb)
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 85%, noncondensing
Altitude
To 2000 meters (6561.68 ft.)
Electrical
Line Voltage
Factory Set for one of two ranges:
104 to 127 V AC or 180 to 250 V AC,
either at 48 to 63 Hz
AC Line Receptacle
Standard IEC 320 three-prong AC line
connector
Power Consumption
1000 VA, maximum
Supplied Accessories
Operators’ Manual
PN: 23177
HV Output Cable
PN: 43466
Line Cord, Spare
Fuses
PN: N5011; s
destination
elected per geographic
Optional Accessories
19” Rack Mount Kit
Model: 608RA (with EIA hole spacing)
Model: 608RAJ (with JIS hole spacing)
Model 20/20C Specifications
Performance
Output Voltage Range
0 to ±20 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
DC Voltage Gain
2000 V/V
DC Voltage Gain Accuracy
Better than 0.1% of full scale
DC Offset Voltage
Less than ±2 V
Output Noise
Less than 1.5 V rms*
Slew Rate
(10% to 90%, typical)
Greater than 450 V/µs
Large Signal Bandwidth
(-3 dB)
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
Stability
Drift with Time
Less than 50 ppm/hr, noncumulative
Drift with Temp
Less than 100 ppm/°C
Voltage Monitor
Ratio
1/2000th of the high-voltage output
DC Accuracy
Better than 0.1% of full scale
DC Offset Voltage
Less than ±2 mV
Output Noise
Less than 10 mV rms*
Output Impedance
47 W
Current Monitor
Ratio
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*
Bandwidth (-3dB)
DC to greater than 10 kHz
Output Impedance
47 W
Features
High-Voltage On/Off
Local
Individual push-button switch
Remote (TTL
compatible input)
TTL high (or open) turns off high-voltage
output. TTL low turns on high-voltage
output.
*Measured using the true rms feature of the HP Model 34401A digital multimeter
Copyright ã 2013 TREK, INC. All specifications are subject to change. 1322/JRB
Measurement and Power Solutions
ww w.t r e k i nc.com
TM
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