7796: Over 200 Ap / up to 180 Vp, DC to 100 kHz, Three-Phase

7796

Industrial amplifier for high current/low impedance operation

  • Stable when driving a wide range of resistive, inductive or capacitive loads
  • 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:

  • 30A continuous at 28 VDC
  • 200A in-rush current capability
  • 150 kHz small signal bandwidth
  • ±180 VDC capable
  • 41 V/µS slew rate
  • Four-quadrant operation (source and sink)

The 7796 power amplifier offers up to 200 Ap power, DC - 100 kHz bandwidth, and controlled-current or controlled-voltage modes of operation. The 7796 works best into loads of 2 ohms or less. For greater voltage or current (up to 800 Ap) units can be combined in parallel or series.

Typically used as a gradient amplifier in small bore, high gain MRI systems of up to 200 Ap per axis and to reproduce waveforms found in EMC standards like MIL STD 1275, MIL STD 461 and DO160.

Output

AC Output

Note: Testing performed at 208V/415V AC into resistive loads as specified. 7796 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. 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. 7794 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.

Ohms

PEAK OUTPUT

RMS OUTPUT
40mSec Pulse,
30% Duty Cycle
5 Min,
100% Duty Cycle
1 Hr,
100% Duty Cycle
5 Min,
100% Duty Cycle
1 Hr,
100% Duty Cycle
Volts Amps Volts Amps Volts Amps Volts Amps Volts Amps Watts
open 181 0 181 0 181 0 128 0 128 0 0
16 159 12 159 10 159 10 112 7 112 7 795
8 159 19 154 19 154 19 109 13 109 13 1463
4 158 39 152 38 152 38 107 27 107 27 2887
2 157 79 * * 141 71 * * 100 50 5004
1.5 148 99 * * * * * * * * *
1 140 140 * * 71 71 * * 50 50 2509
0.5 106 209 * * 63 127 * * 45 90 3999
0.25 53 209 * * * * * * * *  

DC Output

7796 DC Power
7796 DC into 3 ohms

Performance

Frequency Data

7796 Voltage Potential
7796 Output Impedance

Thermal Performance & Accuracy

7796 Temperature over time, 60 Arms, 1 Hz, 0.5-ohm load
7796 Temperature over time, 82.5 Vrms, 40 kHz, 2-ohm load
7796 Transconductance Accuracy vs. Time

Front & Back

7796 Front Panel

 



7796 Back Panel

Specifications

Performance

Note: Testing performed at 208V/415V AC into resistive loads as specified. 7796 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. 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. 7794 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.

Frequency Response, DC - 30 kHz (1 watt): +0.1 to -0.5 dB
8-Ohm Power Response (continuous duty):
   DC to 50 kHz: ± 150 Vpk
   DC to 150 kHz: ± 50 Vpk
   DC to 200 kHz: ± 25 Vpk
Maximum Continuous Output Power: 5000 watts RMS
Slew Rate: 41 V/µSec
Residual Noise:
   Unfiltered:
Less than 75 µV
   Filtered (400 Hz to 30 kHz): Less than 55 µV
THD (DC - 30 kHz): Less than 0.1%
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
Phase Response (10 Hz - 10 kHz) : ±8.3 degrees
Unit to Unit Phase Error: ±0.1 degrees at 60 Hz

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: 0.0125%
   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: -±11 VDC maximum
Common Mode Rejection Ratio: 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 simultanteous displays report one, two, or all four of the following: Vp, VRMS, Ap, ARMS
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: 153 lbs (69 kg), Shipping 168 lbs (76.2 kg)
AC Power: Three-phase, 208 VAC (±10%), 47-60 Hz, 30A 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 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 12.25” (48.3 cm x 57.9 cm x 31.3 cm)

Downloads

7796 Datasheet

Complete technical specifications

7548/7794/7796 Operator's Manual

For 7548, 7794 and 7796 amplifiers

Multiamp Configuration Guide

For 7224, 7226, 7548, 7794 and 7796 amplifiers

SIM Pinouts and Functions

For 7224, 7226, 7548, 7794 and 7796 amplifiers

DXF Model for Chassis

For 7794 and 7796 amplifiers

STEP file for Chassis

For 7794 and 7796 amplifiers

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