7228: Up to 60 Ap/160 Vp, DC to 1 MHz, Single-Phase

7228

Single-phase, 2U, industrial amplifier

  • Up to 4X the long-term power of the 7224 at frequencies above 100 kHz
  • Changes to protection, connection type and modes of operation are accomplished quickly by changing back-panel DIP switches or via remote contact closure
  • Provides user-selectable current limit, DC Blocking and DC Servo for transformer-based loads
  • Series or Parallel systems can be configured using back-panel DIP switches or remote contact closure. Ballast resistors are not required for connecting multiple amps in parallel

Key Performance Capabilities:

  • Up to 1000 watts RMS power output
  • Small signal response up to 1 MHz
  • Up to 16A at 13.5 VDC
  • Can be used to create series or parallel systems for up to 3 times the voltage or 4 times the current output

The 7228 is a 1-kVA, DC-enabled unit that provides advanced protection and exceptional versatility. It features a DC to 1 MHz bandwidth and improved performance at frequencies above 100 kHz. In continuous operation, a 7228 can provide up to four times the output power of the 7224 at frequencies above 100 kHz. If more current or power is needed, amplifiers can be combined in series or parallel and operate as a single system.

Back-panel switches allow the 7228 be configured by the user for high-voltage/low-current, medium voltage and current, or low-voltage/high-current applications. Residual noise, slew rate, and gain linearity have all been improved over the 7224 model. It can safely drive a wide range of resistive, inductive loads.

The 7228 is typically used to create waveforms as required by a variety of EMC standards for DC powered electronics like FMC 1278, DO-160, and MIL STD 461. It can also be used as a gradient amplifier for very small bore, high-gain MRI and NMR systems.

Output

AC Output

Note: Testing performed with fans set to Auto, 20°C ambient temperature, 1 kHz sinewave input signal 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 performed with Bi-level setting set to Manual, Low. **Continuous operation for 45 minutes..

High-voltage Mode

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
16 160 10 153 10 153 10 108 7 108 7 731
8 148 18 136 16 126 15.8 96 12 89 11.2 1000**
4 120 29 90 22 63 15.7 64 16 45 11.2 500
2 92 45 47 23 47 23 33 16 33 16 550

Mid-level Mode

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
8 84.5 10.5 80 10 80 10 57 7 57 7 400
4 77 19 73 18 73 18 54 13 54 13 700
2 67 33 61 30 56 27 43 21 39 19 769
1 52 51 47 46 26 26 33 33 20 20 400
0.5 30 60 13 26 10 20 9.8 18 7.3 14 100

High-current Mode

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
2 33 16 33 16 33 16 24 12 24 12 273
1 29 28 28 28 28 28 20 19 20 19 388
0.75 26 34 26 34 26 34 18 24 18 24 452
0.5 22 43 22 43 22 43 16 31 16 31 488
0.25 14 53 11 45 11 45 8 32 8 32 256

DC Output

Note: Testing performed in high-current mode.

 

OUTPUT (Amperes)
Volts DC 5 Minutes,
100% Duty Cycle		 1 Hour,
100% Duty Cycle
48.0 21 16
24.0 25 25
13.5 20 16

Performance

Frequency Data

Front & Back

DIP Switches

Settings, Configuration & Modes controlled by external DIP switches or remote contact closure

Sixteen back-panel DIP switches make it easy to configure the 7228 in the field.

  • High-voltage, ±150 Vp; Mid-level, ±80 Vp; and High-current, ±40 Vp
  • Stand-alone, Series, or Parallel connected
  • DC blocked or enabled
  • DC servo on or off
  • Current limit on or off; level
  • Input balanced or unbalanced
  • Controlled voltage or controlled current
  • Input ground lift
  • Gain of 6:1 or 20:1

Specifications

Performance

Testing was done at 100 Hz. Continuous DC power levels are lower. See DC Specifications chart for test conditions.

7228 accuracy was measured when drivine into a 10-ohm load with between 0.1 VDC and 6 VDC or between 0.2 VAC and 5 VAC presented at its inputs.

Frequency Response, DC - 1 MHz (1 watt): ±3 dB dB
Slew Rate: 100 V/µSec
Residual Noise,
   10 Hz to 300 kHz: 900 µV (0.90 mV)
   20 Hz to 20 kHz: 350 µV (0.35 mV)
Signal-to-Noise Ratio,
   10 Hz - 30 kHz: –109.5 dB
   10 Hz - 80 kHz: –106.3 dB
   10 Hz - 500 kHz: –100.5 dB
Unit to Unit Phase Error: ±0.1 degrees at 60 Hz
THD (DC - 30 kHz): less than 0.1%
Output Offset,
   With DC Servo Off: Less than ±5 mVDC
   With DC Servo On: Less than ±400 µVDC
DC Drift: (after 20 minutes of operation),
   With DC Servo Off: Less than ±1.5 mVDC
   With DC Servo On: Less than ±200 µVDC
Output Impedance: 5.3 mOhm in Series with 0.95 µH
Phase Response (10 Hz - 10 kHz) : 0 to -5 degrees plus 750 nsec propagation delay

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: 5 amperes/volt
Gain Linearity (over input signal, from 0.2V to 5V), DC: 0.05%, AC: 0.15%
Max Input Voltage: ±10V, balanced or unbalanced

Status Display, Control, I/O

Front Panel LED Displays indicate: Ready, Standby, Fault, Over Temp, Over Voltage, Overload
Soft Touch Switches for: Run, Stop, Reset
Gain Control, when enabled: Voltage gain adjustable from 20 to 0
On/Off Breaker
Back Panel Power Connection: 25 Amp IEC (with retention latch)
Signal Output: Three-position terminal strip (OUTPUT/COM/CHASSIS GROUND)
Signal Input: User Selectable BNC or Barrier Strip, Balanced or Unbalanced

Communication Capabilities

Current Monitor: 5A/V ± 1%; 2.5A/V ± 1% (differential configuration)
Reporting: Run/Standby Status, System Fault, Over Temp, Over Voltage, Over Load, Temperature Monitor
Remote Control via Expansion Port: Blanking, Force to Standby, Reset after a Fault, DC Block, DC Servo, Control Mode, Bi-level Mode, Power Supply Rail Mode, Balanced/Unbalanced Input Signal, Series/Parallel Mode, Gain 20:1/6:1, Signal Ground, Current Limit

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 black aluminum with a powder coat finish. The unit occupies two EIA 19-inch-wide units.
Weight: 41 lbs (18.6 kg), Shipping 51 lbs (23.2 kg)
AC Power: Single phase, 120 VAC, 60 Hz, 20 Amp service; (220-240 VAC, 50-60 Hz, 10 Amp service 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:Variable-speed, thermostatically controlled cooling fans provide forced air cooling from front to back through removable filters.
Airflow: 180CFM
Dimensions: 19” x 22.75” x 3.5” (48.3 cm x 57.8 cm x 8.9 cm)

Downloads

7228 Datasheet

Complete technical specifications

7228-B Operator's Manual

For 7228 amplifiers built after 4/8/2018

7228-A Operator's Manual

For 7228 amplifiers built before 4/8/2018

Expansion Port Pinouts and Functions

For 7228 amplifiers

STEP file for Cabinets

For 7228 amplifiers

Recommended Accessories

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T 3700

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GCL

SIM2

Breakout Accessory

Easy connection to the DB-62 port for remote applications.

Series Cable

DB-62S

Series Multiamp Cable

Connect two 7228 amplifiers in Series for multiamp applications

 

 

 

Parallel Kit

DB-62P

Parallel Multiamp Kit

Connect two 7228 amplifiers in Parallel for multiamp applications

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