7820-50-400

50V RMS, 400A RMS, DC to 60 kHz

7820-50-400

High-power, high-precision, AC/DC linear power amplifier

Stable when driving a wide range of resistive, inductive or capacitive loads
Four-quadrant operation (source and sink)
Field-selectable controlled-voltage or controlled-current operation
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

Key Performance Capabilities:

Output Power: Up to 20 kVA continuous, 40 kVA short-term
Current: Up to 400A continuous, 800A short-term
Voltage: Up to ±350 Vp
Bandwidth: DC to 60 kHz, ±3 dB
Slew Rate: 40V/µs
THD: Less than 0.25% (DC to 20 kHz)
DC Drift: Less than ±400 µV (from room temperature to thermal shutdown)

SKU: N/A Category: Amplifiers

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OVERVIEW

AE Techron’s 7820 Series AC power amplifiers are durable, four-quadrant, DC-enabled, low-noise, wide-bandwidth amplifiers. This combination of features and capabilities makes them a great choice for a large number of research and industrial applications. 7820 series amplifiers are a great solution if bandwidth and/or system noise is a problem. They are able to drive low-impedance loads at frequencies of up to 60kHz.

Because they utilize a linear circuit topology, AE Techron 7820 series amplifiers have no switching noise in their output and very low radiated EMI. This results in THD and noise floors that are much lower than what is possible with traditional switch mode amplifiers, making them ideal for applications that require either high precision or, because of sensitive measurements, cannot tolerate the radiated noise associated with switch mode amplifiers.

7820 series amplifiers are tough, both physically and electrically. 7820 series models have been used for conducting experiments on a Navy warship, controlling a magnetic field in a fusion experiment, and driving DUTs while absorbing back EMF when there is a failure.

The 7820 series is designed and built for applications where large surge currents or long duration power is needed. This makes them ideal for applications where power or duty cycle requirements are greater than is possible with consumer- or pro-audio-grade amplifiers. Because power ratings are continuous, AE Techron amplifiers often produce between 4 and 8 times more power than a similarly rated consumer amplifier.

The 7820 Series consists of three amplifier models: 7820-50-400, 7820-100-200 and 7820-200-100. Each model has been optimized for specific load impedances, from 0.1 ohm to 8 ohms. Customized versions can be ordered with special amplifier configurations and/or with extra rack space to install additional equipment. Contact us today; let us see if we can create a custom configuration specifically to meet your needs.

OUTPUT CHART

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.

	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
1	98	104	98	104	97	104	69	72	69	72	4968
2	95	92	95	92	95	92	66	64	66	64	4224
0.5	88	176	88	176	88	176	60	120	60	120	7200
0.25	81	324	81	324	81	324	56	224	56	224	12544
0.125	72	576	72	576	72	576	50	400	50	400	20000
0.0625	50	840	32	536	32	536	23	364	23	364	8372
0.03125	23	788	23	776	23	764	16	532	16	520	8320

SPECIFICATIONS

Performance Specifications

Testing performed at 208V/415V AC. 7800 series 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.

Output Range: -95Vp to +95Vp
Output Current: 0A to 400A RMS continuous
Maximum Continuous Output Power: 20 kW RMS
Peak Current: 840A for 40 ms
Slew Rate: 40 V/µs
Supply Voltage: 3-phase 208V ±10%, 60A, 50/60 Hz; 400V, 45A version available
Bandwidth (-3dB): DC to 60 kHz
Phase Response (10 Hz – 10 kHz): ±8.3 degrees
Unit to Unit Phase Error: ±0.1 degrees at 60 Hz
Output Offset: <±200 µV
Output Offset Current: <10 mA, DC
Residual Noise, 10 Hz to 20 kHz: <250 µV (<0.25 mV)
THD (DC – 20 kHz): <0.25%
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

Unbalanced BNC connector: 10 kΩ single-ended
Gain,
- Voltage Mode: 80 volts/volt
- Current Mode: 80 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
Input Sensitivity: 3.0V input for 3800W output into 1 ohm, adjustable
Common Mode Rejection Range: ±11V DC maximum
Common Mode Rejection Ratio: Better than 70 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: Barrier strip
Signal Output: Back-panel high-current connectors
Signal Input: Back-panel unbalanced BNC

Communication Capabilities

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

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: Black powder-coated heavy-duty steel frame and panels
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 filters via six 100ft3/min. fans
Dimensions (HxWxD): 64.6 x 22.6 x 31.6 in. (164.1 x 57.4 x 80.3 cm)
Weight: Approximately 850 lbs. (386 kg)