7548

Industrial Amplifier for Pulse or Continuous Duty

7548

Up to 100 Ap/195 Vp, DC to 100 kHz, Three-Phase

Field-selectable controlled-voltage or controlled-current operation
Can be switched between rail supply modes to optimize for various load impedances
Protection circuits guard against over/under voltage, over current, over temperature, and circulating ground currents

Key Performance Capabilities:

Over 12,000 watts peak for 40 ms and 5,500 watts peak continuous into a 1Ω load
40 ms pulses of up to 105 Ap into a 1Ω load
Frequency bandwidth of DC-50 kHz at rated power; DC-100 kHz at reduced power
Continuous system output of 800 Vp or 170 Ap maximum are possible with multiple, interconnected amplifiers

SKU: N/A Category: Amplifiers

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OVERVIEW

The 7548 amplifier is a DC-enabled, high-powered unit designed to provide very low noise and fast slew rates. A single 7548 has an output capability of 100 amperes peak and 200 volts peak when driving typical MRI gradient coil loads. It can output a 40 ms pulse with up to 105 amperes peak current into a 1-ohm load. If more current is needed, up to four amplifiers can be combined in series or parallel and operate as a single system.

The 7548 can operate in either voltage or current mode and features robust output devices and a power range of over 3300 watts RMS. 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. It can be combined in a three-phase system ideal for MIL-STD-704F (AC and 28V DC tests).

OUTPUT CHART

AC Output

Note: Testing performed into resistive loads as specified. Performance reported is typical into the specified load up to 20 kHz frequency levels. Performance may be affected when operating into highly reactive loads or above 20 kHz, reducing maximum voltage, current and power output.

*Testing not performed.

	PEAK OUTPUT						RMS OUTPUT
	40mSec Pulse, 20% Duty Cycle		5 Min, 100% Duty Cycle		1 Hr, 100% Duty Cycle		5 Min, 100% Duty Cycle		1 Hr, 100% Duty Cycle
Ohms	Volts	Amps	Volts	Amps	Volts	Amps	Volts	Amps	Volts	Amps	Watts
Open	200	0	200	0	200	0	141	0	141	0	0
16	195	12	195	12	195	12	138	8	138	8	1170
8	183	23	183	23	183	23	129	16	129	16	2104
4	165	41	165	41	165	41	117	29	117	29	3381
2	150	75	*	*	86	43	*	*	61	30	1848
1.5	134	90	*	*	*	*	*	*	*	*	*
1	116	105	*	*	*	*	*	*	*	*	*
0.5	66	112	*	*	*	*	*	*	*	*	*

DC Output

Note: Testing performed in high-current mode.

	OUTPUT (Amperes)
Volts DC	10 Min, 100% Duty Cycle	1 Hr, 100% Duty Cycle
13.5	15	10
24.0	17	12
48	30	20

PERFORMANCE

SPECIFICATIONS

Performance

Note: 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 – 300 kHz (1 watt): +1.0 to -1.5 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
Power Sinking: 1.2 kVA at 120 VAC
Slew Rate: >35 V/µs
Residual Noise, 10 Hz – 20 kHz: Less than 250 µV
Unit to Unit Phase Error: ±0.1 degrees at 60 Hz
Phase Response (10 Hz – 10 kHz): ±5 degrees plus 600 nsec propogation delay
THD (DC – 20 kHz): Less than 0.25%
Output Offset: Less than ±200 µV
Output Offset Current: Less than 10 mA, DC
DC Drift:
- From Cold to Maximum Operating Temperature: ±400µV
- After 20 minutes of Operation: ±200µV
Output Impedance: 3.2 mOhm in Series with 2.2 µH

Input Characteristics

Balanced with ground: Three terminal barrier block connector, 20k ohm differential
Unbalanced: BNC connector, 10k ohm single ended
Gain, Voltage Mode: 20 volts/volt; Current Mode: 20 amperes/volt
Gain Linearity (over input signal, from 0.2V to 5V):
- DC: 0.15%
- AC: 0.030%
Max Input Voltage: ±10V, balanced or unbalanced
Input Impedance: 20 kOhm; differential
Input Sensitivity: 3.0V input for 3800W output into 1 ohm (adjustable)
Common Mode Rejection Range: -±11 VDC maximum
Common Mode Rejection Ratio: Better than -65 dB

Status Display, Control, I/O

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: Blanking control, 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, 208 VAC (±10%), 47-60 Hz, 20A AC service; (400 VAC (±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 100-ft3/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 (HxWxD): 8.75″ x 19″ x 22.8″ (22.2 cm x 48.3 cm x 57.9 cm)