TB 11-6625-2488-50/1
a. Identification
Nomenclature .......................................................... FIFTY WATT AMPLIFIER
Manufacturer ........................................................... Krohn-Hite Corporation
Model number ......................................................... DCA-50
Reference ............................................................... Manufacturer's operating and maintenance manual.
b. Specifications
Power requirements ................................................ 15 or 230, 10, volts ac, single-phase, 50 to 60
Hz, 600 watts.
Power output ........................................................... 50 volt-amperes (100 volt-amperes peak),
continuous (dc to 250 kHz into 330 ohms
resistive or inductive; dc to 50 kHz into 330 ohms
capacitive; 1 Hz to 500 kHz into 200 ohms
resistive).
Output regulation (no load to full resistive ................. Less than 3% from 10 Hz to 100 kHz, less than 6%
load)
from dc to 500 kHz.
Load impedance 1 .................................................... Nominal 200 ohms from 1 Hz to 500 kHz; 330 ohms
at less than 1 Hz. Minimum load, 10 ohms.
Frequency response ................................................ 1 db from dc to 500 kHz; approximately 3 db
down at 800 kHz.
X1 or X10 gain positions ....................................... Greater than 1 megohm in parallel with 50 f.
Variable gain positions ......................................... 5000 ohms in parallel with 50 f.
Sensitivity (maximum gain):
200 ohm load ....................................................... 10 volts rms for 50 watts output.
330 ohm load ....................................................... 13 volts rms for 50 watts output.
Input coupling ........................................................... Direct or capacitive with low cutoff frequency of
1 Hz.
Input voltage limits:1
X1 or X10 gain positions ....................................... 400 volt maximum dc component (capacitor
coupled).
Variable gain positions ......................................... Less than 2 watts dissipation in 5000 ohm GAIN
control.
Output dc level stability (one hour):1
Ac coupling .......................................................... 0.02% of peak output voltage at fixed line voltage;
0.1% for 10% line voltage variations.
Dc coupling .......................................................... 0.2% of peak output voltage at fixed line voltage;
0.5% for 10% line voltage variations.
Phase shift:1
X10 and variable gain positions ............................ 0 1 degree from dc to 10 kHz.
X1 gain position .................................................... 180 1 degrees from dc to 10 kHz.
Harmonic distortion, rms (full power output) ............. Less than 0.3% from 5 Hz to 50 kHz, less than 0.5%
from 0.01 Hz to 100 kHz, and less than 5% at 500
kHz.
Hum and noise: 1
Input short circuit .................................................. Less than 10 millivolts
Input open circuit .................................................. Less than 30 millivolts
Interval .................................................................... In accordance with TB750-236.
Time required .......................................................... 3 hours (approx)
Technique ............................................................... Dc and low frequency
This specification is for information only and is not necessarily verified in this bulletin.
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