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                                    The Model 3 103A-4 is a variable band-pass Filter with a low
cutoff frequency range adjustable from 10Hz to 1MHz and a
high cutoff range adjustable from 30Hz to 3MHz . The
pass-band gain is unity (OdB), with attenuation rate of 18dB
per octave outside the passband, and a maximum attenuation
of 80 dB. Maximum input signal amplitude is 3 volts rms and
output hum and noise is less than 100 microvolts.

OPERATING AND MAINTENANCE
MANUAL

1.0 GENERAL
DESCRIPTION............................................................................................1
1.1
INTRODUCTION.................................................................................................1
1.2 SPECIFICATIONS.
.........................................................................................1
1.3
TERMINALS.....................................................................................
.2
1.4 FRONT PANEL
CONTROLS...............................................................................2
1.5 POWER
REQUIREMENTS....................................................................................2
1.6 DIMENSIONS AND
WEIGHTS...........................................................................2
1.7 FILTER
CHARACTERISTICS............................................................................2
2.0
OPERATION.................................................................................................................5
2.1
INTRODUCTION.................................................................................................5
2.2
TERMINALS..................................................................................................5
2.3 FRONT PANEL
CONTROLS................................................................................5
2.4 LINE VOLTAGE AND FUSES. .
...................................................................5
2.5
OPERATION.....................................................................................................5
3.0 CIRCUIT
DESCRIPTION............................................................................................7
3.1
INTRODUCTION............................................................................................7
3.2 CIRCUIT
DESCRIPTION................................................................................7
4.0 MAINTENANCE.
.........................................................................................................9
4.1
INTRODUCTION................................................................................................9
4.2 POWER
SUPPLY.................................................................................................9
4.3 SIGNAL TRACING
PROCEDURE........................................................................10
4.4 TUNING
CIRCUITS......................................................................................11
5.0 CALIBRATION AND
ADJUSTMENT...........................................................................13
5.1
INTRODUCTION.................................................................................................13
5.2
SPECIFICATIONS,........................................................................................13
5.3 TEST EQUIPMENT
REQUIRED.......................................................................14
5.4 POWER SUPPLIES.
.........................................................................................14
5.5 CALIBRATION
PROCEDURE............................................................................14
6.0 PARTS LIST, SCHEMATIC AND
LAYOUT................................................................21