Descriptive Data

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.

Input impedance:1

X1 or X10 gain positions ....................................... Greater than 1 megohm in parallel with 50 µ µ f.

Variable gain positions ......................................... 5000 ohms in parallel with 50 µ µ 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

c. Calibration

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.