Studio-technologies ISS Manual do Utilizador descarregar pdf (Página 39)

Issue 3, June 1990 ISS User Guide

Page 40 Studio Technologies, Inc.

ISS

6) Connect the signal generator output to

the ISS left channel line input, located

on the back of the ISS.

7) Set the signal generator frequency to

1kHz, with output level to OFF so that

no signal is getting sent to the ISS left

line input. The signal generator signal

must be a sine wave.

Checking the Power Supply Voltages

With the DC voltmeter common lead con-

nected to COM test point: check +15 test

point for +15 ±1Vdc, 15 test point for

15 ±1Vdc.

Checking for the Correct Rough Setting

of the Compander

1) Again insure that no audio is coming

into the ISS.

2) With DC voltmeter common lead con-

nected to COM test point: check TP5

for 1.35 ±0.3Vdc. If not within this

range, set R69 to give 1.35Vdc at TP5.

3) With DC voltmeter common lead con-

nected to COM test point: check TP7

for 1.35 ±0.3Vdc. If not within this

range, set R56 to give 1.35Vdc at TP7.

Setting the Analog Delay Clock

Frequency

1) Connect common lead of frequency

counter to COM test point. Check TP2

for 64kHz ±0.5kHz. If not within this

range, set R20 to give a value in this

range.

Adjusting the Incoming Audio Test

Signal

1) Connect the AC voltmeter common

lead to the COM test point.

2) Adjust audio generator output level to

give 10dBu reading at TP3.

Adjusting the Compressor

1) Move AC voltmeter lead to test point

TP4. Note the reading that you observe.

It should be 10 ±2.5dBu.

2) Reduce generator output level 20dB.

3) Observe level at TP4. It should have

dropped 15 ±0.3dB. If not, adjust R69

to get this condition.

4) Raise generator level 20dB. Observe

level at TP4.

5) Reduce generator output level 20dB.

Observe level at TP4. It should drop 15

±0.3dB. If not, again adjust R69 to get

this condition.

Adjusting the Analog Delay for Minimum

Distortion

1) Adjust generator frequency to 5kHz.

Set level to give 10dBu when mea-

sured at TP3.

2) Connect distortion analyzer to measure

at TP1.

3) Adjust R18 to give minimum distortion

(THD + Noise). The acceptable mini-

mum distortion is 0.35% or lower. The

usual minimum is 0.25% to 0.10%.

Adjusting the Expander

1) Adjust generator frequency to 1kHz.

Set level to give 10dBu at TP3.

2) Measure level at TP1.

3) Drop generator level 20dB. Level at TP1

should drop 20 ±0.3dB. Adjust R56 to

get this condition.

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