AE Techron 7548 DC - Enabled Linear Power Amplifier

The AE Techron 7548 amplifier is a 3300-VA, DC-enabled, high-powered unit designed to provide very low noise, low harmonic distortion and fast slew rates. It can safely drive a wide range of resistive, inductive loads. Typical use includes as a power source for EMC testing in applications that require both continuous AC or DC signals and significant short term (burst) signals. Two 7548 connected in series can output 240V RMS at 20A RMS.

The 7548 can be used singly or in series to meet or exceed Aviation AC power tests requirements found in RTCA/DO 160.  The 7548 also can be used as a Voltage or Current Amplifier, so it also makes an ideal choice for driving large Helmholtz coils specified in MIL STD 461 or various Automotive Standards. In addition, the 7548 can be connected to form large, low-distortion, two- or three-phase power systems with voltages of up to 600V L-L and 360 L-N, ideal for MILSTD-704F (AC and 28V DC tests).

AE Techron 7548 DC - Enabled Linear Power Amplifier

• Four-quadrant operation (source and sink).
• Field-selectable controlled-voltage or  controlled-current modes of operation
• Over 12,000 watts peak for 40 ms and 5,500 watts peak continuous into a 1-ohm load
• Continuous system output of 800 Vp or 170 Ap are possible with multiple, interconnected amplifiers
• Can be combined to form larger, more capable systems: Single-phase AC system with DC offset capable of 120VAC, 240VAC or 360VAC, or three-phase AC system with DC offset capable of 208VAC, 400VAC or up to 600VAC L-L
• Can be switched between rail supply modes to optimize for various load impedances
• Protection circuitry protects the amplifier from input overloads, improper output connection (including shorted and improper loads), over- temperature, over-current, and supply voltages that are too high or low   

Performance AE Techron 7548 DC - Enabled Linear Power Amplifier

Testing performed at 208V/415V AC. 7548 amplifiers can operate from 400V AC ±10%. Since these amplifiers have an unregulated power supply, low line conditions may slightly affect the maximum voltage potential. All testing was performed in Controlled-Voltage (CV) mode. Accuracy was measured when driven into a 10-ohm load with between 0.1V DC and 6V DC or between 0.2V AC and 5V AC presented at its inputs. 

Frequency Response, DC—30 kHz (1 watt): +0.1 to -0.5 dB

8-Ohm Power Response (continuous duty)

•    DC to 40 kHz: ±180 Vpk
•    DC to 50 kHz: ±150 Vpk   
•    DC to 150 kHz: ±50 Vpk
•    DC to 200 kHz : ±25 Vpk

Maximum Continuous Output Power: 3300 watts RMS

Slew Rate: >35 V/µSec

Residual Noise, 10 Hz to 20 kHz: <250 µV (<0.25 mV)

Unit to Unit Phase Error: ±0.1 degrees at 60 Hz

Phase Response (10 Hz - 10 kHz): ±5 degrees plus 600 nsec propagation delay 

THD (DC - 20 kHz): <0.25%

Output Offset: <±200 µV

Output Offset Current: <10 mA, DC

DC Drift, 

    From Cold to Maximum Operating Temperature: <±400 µV 

    After 20 Minutes of Operation: ±200 µV

Output Impedance:  3.2 mΩ in Series with 2.2 µH

Input Characteristics;

   Balanced with ground: Three-terminal barrier-block   

   connector, 20 kΩ differential 

   Unbalanced: BNC connector, 10 kΩ single-ended

Gain:

   Voltage Mode: 20 volts/volt 

   Current Mode: 20 amperes/volt

Gain Linearity (over input signal, from 0.2V to 5V): 

DC: 0.0125% 

AC: 0.030%

Max Input Voltage: ±10V, balanced or unbalanced

Input Impedance: 20 kΩ differential

Common Mode Rejection Range: ±11V DC maximum

Common Mode Rejection Ratio: Better than -65 dB

Status Display, Control, I/O AE Techron 7548 DC - Enabled Linear Power Amplifier

Front Panel LED Displays indicate: Ready, Standby, Fault

Soft Touch Switches for: Run, Stop, Reset

LCD Display: Can be configured for up to four simultaneous displays reporting one, two, or all four of the following: Vp, VRMS, Ap, ARMS. Also reports any fault conditions that occur and suggests corrective action.

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); resistor installed between SAMPLED COMMON AND CHASSIS GROUND is a 2.7-ohm, 2W, 5%, metal-oxide resistor

Signal Input: User-selectable BNC or Barrier Strip, Balanced or Unbalanced

Interlock Connector: 25-pin D-sub connector used for  amplifier control and status applications; also used in multi-amplifier applications

Communication Capabilities

Current Monitor:  20A/V  ±1%; 10A/V  ±1% (differential configuration)

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

Remote Control via Interlock Connector: Force to Standby, Reset after a Fault

Protection

Over/Under Voltage: ±10% from specified supply voltage amplifier is forced to Standby

Over Current: Breaker protection on both main power and low-voltage supplies

Over Temperature: Separate output transistor, heat sink, and transformer temperature monitoring and protection

Physical Characteristics

Chassis:The amplifier is designed for stand- alone or rack- mounted operation. The chassis is aluminum with a black powder-coat finish. The unit occupies five EIA 19-inch-wide units.

Weight: 103 lbs (46.7 kg), Shipping 115 lbs (52.2 kg)

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

Operating Temperature:  10°C to 50°C (50°F to 122°F), maximum output power de-rated above 30°C (86°F).)

Humidity: 70% or less, non-condensing

Cooling:  Forced air cooling from front to back through removable filters via four 100ft3/min. fans. No space is required between rack-mounted amplifiers. Air filters are removeable from the rear via one fastener per side and may be eliminated if cabinet filtration is provided.

Dimensions: 19” x 22.8” x 8.75” (48.3 cm x 57.9 cm x 22.2 cm)