Performance
Note: Testing performed at 208V/415V AC. 7548amplifiers 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 - 30 kHz (1 watt): +0.1 to -0.5 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: >40 V/µSec
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: 0.0125%
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
