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)
   10 Hz to 80 kHz: 450 µV (0.45 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)