2120 gradient amplifier and power supply


180 Volts
200 Amps

The 2120 is a high-power, DC-enabled linear amplifier and integrated power supply that offers a wide bandwidth and exceptional control of drift and distortion. The 2120 functions as a voltage or current source, making it a good choice for use in the lab or classroom. Its linear design provides a very-low noise floor and fast current rise times. Because the 2120 has no ripple noise, no synching with the console is required.

The AE Techron brand is known throughout the world for its robust, low-noise gradient amplifiers as well as its product service and support.


2120 Pulsed Output

Pulse testing performed with unit operated in Controlled-Current mode with a load equal to 500 µH + 100 mΩ and at 25°C ambient temperature.

Output (±A Peak)


∞(DC) 500 / 500 100 / 100 10 / 20 170 / 1000 25 / 1000 4 / 100
60 50 50 80 200 200 200

*DC 1Ω


  • Output of 200 amperes peak, 180 volts.
  • 4-quadrant linear design.
  • Blanking feature lowers the noise floor on the amplifier by shutting down the output stage. This action occurs in less than 10 µs.
  • Current mode response: DC-5 kHz (compensation dependent); Voltage mode response: DC-20 kHz at rated power.
  • Robust, linear power supply results in extremely low noise; bi-level switch design limits heat dissipation to output devices.
  • Provides precision control of output offset, DC drift and gain linearity.
  • Protection circuitry guards against input overloads, improper output connection (including shorted and improper loads), over-temperature, over-current, and supply voltages that are too high or low.
  • Shipped ready to operate from 208-volt (±10%) three-phase AC mains. 400-volt model available on request.


Specification typical at 25°C ambient. Unless otherwise noted, testing was done in Current mode with a load = 500 µH + 100 mΩ.

Peak Current Limit: 209A

Gain Linearity* (over input signal, from 0.2V to 5V):
  AC: 0.030%

Output Offset (adjustable to zero):
  Voltage Mode:
Less than ±400 µV
  Current Mode: ±5 mA

Input Characteristics:
  Three-Terminal Barrier Block Connector:
Balanced with ground; 20 kΩ differential
  BNC Connector: Unbalanced; 10 kΩ single ended
  Max Input Voltage: ±10 V balanced or unbalanced
  Common Mode Rejection: -70 dB with 5V input

Output Impedance,
  Current Mode (effective):
  Voltage Mode (typical): 3 mOhms in series with 2.23 µH

  Current Mode:
500 µH + 100 mΩ
  Adaptable Range: 5 µH to 2.5H; 0.01Ω to 20Ω

Current Mode Response: -3 dB at 5 kHz (compensation dependent)

Current Settling Time, Ramp 0A to ±50A or ±50A to 0A:
  20 µs to within 1.0A or 1%
  35 µs to within 200 mA or 0.2%

Total Harmonic Distortion:
  Current Mode:
Less than 0.1%
  Load: 500 µH + 100 mΩ

Noise Floor (when Blanking circuit is enabled): 5 µA or less

DC Drift - Self Heating Drift, 0 to ±60 A: 5 mA/10 minutes maximum

Noise Output:
  10 Hz to 1 kHz:
0.2 mA
  1 kHz to 60 kHz: 0.05 mA

Ripple Noise Output: None

Slew Rate, Voltage Mode: 41 V/µs

Remote Control and Monitoring (back-panel D connector):
  Current Monitor:
±1V / 20A ±1%
  Reporting: System Fault, Over Temp, Over Voltage, Over Load
  Control: Force to Standby, Remove from Standby, Reset after a fault

Amplifier Protection:
  Over Load/Distortion (IOC):
Shutdown or temporary fault
  Current vs Time (ODEP): Shutdown or temporary fault
  Each heat sink temperature: Shutdown 105°C
  Overvoltage Shutdown: 229 VAC / 440 VAC
  Undervoltage Shutdown: 187 VAC / 360 VAC

*Gain Linearity Accuracy was measured in Voltage mode with the amplifier driven into a 10Ω load with between 0.1VDC and 6VDC or between 0.2VAC and 5VAC presented at its inputs.

Display, Control, Status, I/O

Status Indicators (front panel): LEDs indicate a status of Run, Ready or Standby, and Fault conditions

Controls (front panel):
  Soft Touch Switches:
Run (Enable), Stop and Reset functions

Controls (back panel):
 AC Mains Switch and Circuit Breaker:
Dual-function power switch and circuit breaker; rating: 30A for 208 volts or 15A for 400 volts

Connectors (back panel)
  Power Connection:
NEMA-style locking receptacle; matching AC connector also included
  Signal Output: 4-position terminal barrier block: OUTPUT / COMMON / SAMPLED COMMON / CHASSIS GROUND
  Signal Input: User-selectable unbalanced BNC or balanced Barrier Strip
  Interlock I/O Connection: 25-pin D connector provides for remote monitoring and control functions

Power Requirements: Three-phase, 208 VAC ±10%, 47-60 Hz, 30 Amp service; (400 VAC ±10%, 15 Amp service model available)

Thermal Requirements:
  Operating Temperature:
+10°C to +50°C (+50°F to +122°F). Maximum output power de-rated above 30° C (86° F)
  Storage: –30°C to +85°C (–22°F to +185°F)
  Humidity: 70% or less, non-condensing

Physical Characteristics:
19" L x 8.75" H x 22.8" D (48.3 cm L x 22.3 cm H x 57.9 cm D)
  Cooling: Forced air cooling from front to back through removable filters via six 100 ft3/min. fans. No space is required between rack-mounted amplifiers. Air filters are removable from the rear via one fastener per side and may be eliminated if cabinet filtration is provided.
  Weight: 153 lbs (69 kg)
  Shipping Weight: 158 lbs (71.7 kg)