7224 amplifier


Up to 100Apk current source, ideal for protection relay production testing and commissioning.

The 7548RLYwas created to meet the demanding requirements of the power utility industry. Capable of outputtingup to 100 amperes peak current, the 7548RLY is powerful enough to put protection relays, fuses and other critical components through a full range of tests. The low noise floor, low distortion and minimal phase error of the 7548RLY make it the ideal amplifier for power grid modeling.


  • High compliance voltage allows the 7548RLY to drive electromechanical relays directly.
  • Maintains phase accuracy for any load from a dead short to 0.25 ohms.
  • Front panel indicators for rapid assessment of amplifier status.
  • Designed to survive input overloads, continuous operation under demanding conditions and improper output conditions – including improper loads.
  • Shipped ready to operate from three-phase, 200-220 VAC (±10%) 47-60 Hz, 20A service. 400 VAC (±5%), 10A model available on request.
  • Installs in a standard 19-inch rack; or stands alone for bench-top operation.
  • Backed with AE Techron’s application engineering, service facilities, complete technical information and a 1-year warranty.



Pulse/Burst Specifications




0.5 ohms 20 second 60 Hz Sine 57A rms / 80.6A peak
DC 25A peak
0.5 second 60 Hz Sine 66A rms / 93A peak
DC 70A peak
0.2 second 60 Hz Sine 66A rms / 93A peak
DC 70A peak


Frequency Data

7224 Voltage Potential vs. Frequency



At 1V input, 20A output, amplifier transconductance set to 20.


Input Signal


1 kHz
100 Hz
2 ohms Sine 19.9 20
1 ohm Sine 20 20
1/2 ohm Sine 20 20
Short (unimpeded wire) Sine 20 20

Physical Characteristics

Indicators and Controls

Front Panel7796 amplifier front panel controls

LED Displays Indicate: Ready, Standby, and Fault Conditions in the output stage

LCD Display: Lists type of Fault Condition and gives suggested corrective action; User-configurable for up to four simultaneous displays reporting, one, two or all four of the following: Voltage Peak, Voltage RMS, Current Peak, and Current RMS

Soft Touch Switch: Places amplifier in Run or Standby mode

Back Panel

Signal Output: +/Common/Sampled Common

Signal Input: User Selectable BNC or Barrier Strip, Balanced

7548 amplifier back panelCommunication Capabilities

Current Monitor: +/- 1V / 20A +/- 1%

Reporting: System Fault, Over Temp, Over Voltage, Over Load

Control: Force to Standby, Reset after a Fault

Physical Characteristics

Chassis: Black, all-aluminum chassis is designed for stand-alone or rack-mounted operation. The unit occupies five EIA 19-inch-wide units.

Weight: 110 lbs (50 kg)

AC Power: Three phase, 208 VAC (±10%), 47-60 Hz, 20A AC service (400 VAC (±10%), 15A version available)

Cooling: Internal forced-air fans, 250 cfm.

Dimensions: 19 in. x 22.8 in. x 8.75 in. (48.3 cm x 57.9 cm x 22.25 cm)