FREQUENCY RESPONSE TEST

TM 11-5835-241-13&P

(34) Set signal generator frequency to 1000 Hz and output

level for 10 volts.

(35) Adjust RECORD LEVEL control for +3 VU on VU meter.

(36) Record 60 seconds of this signal.

(37) Set signal generator frequency to 3000 Hz and output

level for 10 volts.

(38) Adjust RECORD LEVEL control for -3 VU on VU meter.

(39) Record 60 seconds of this signal.

(40) Set signal generator frequency to 5000 Hz and output

level for 10 volts.

(41) Adjust RECORD LEVEL control for -9 VU on VU meter.

(42) Record 60 seconds of this signal.

(43) Set signal generator frequency to 7500 Hz and output

level for 10 volts.

(44) Adjust RECORD LEVEL control for -9 VU on the VU meter.

(45) Record 60 seconds of this signal.

(46) Rewind tape.

(47) Connect distortion analyzer to EXTENSION SPEAKER jack

across a precision (1%) 8-ohm resistor.

(48) Observing distortion analyzer in VTVM mode, while play-

ing back the 1000 Hz recorded signal, adjust PLAY LEVEL for 4 volts

This sets recorder output

as indicated on distortion analyzer meter.

for 2 watts at 1000 Hz reference.

(49) Rewind tape and measure distortion at all recorded

Do not change setting of PLAY LEVEL control. Measured

frequencies.

distortion should not exceed 5%.

FREQUENCY RESPONSE TEST.

(1) Connect signal generator to MIC jack.

(2) Set SPEED control for 7.5 i.p.s.

5-23

Index