Racal Instruments 9901 Maintenance Manual page 7

CONTENTS
(Confinued)
Data Latch/Unlatch. Normal/Hold and
Reset
Page
4-3
Channel
'A'
Input
4-3
AC
Amplifier 4-3
DC
Amplifiers 4-4
'B'
Channel
DC
Amplifier
4-4
Bounce
Protection
4-4
'A'
Channel
DC
Amplifier
4-5
Check
Mode
4-5
Slope Selection
4-5
Manual
Start/Stop
4-6
Data Output and
Display
System 4-6
Multiplex Readout and
Display
4-6
Decimal
Point
and Overflow Decode 4-6
Gate
Indicator
LP2
4-7
Display Time and
Reset
Generator
4-7
Display Time
Circuit
4-7
Reset Pulse
4-7
Manual
Reset
4-8
External Reset
4-8
Segment Check
4-8
Frequency Standard
4-8
Standard Oscillator Assembly 19-0834 4-8
Optional
Oscillator
4-8
Frequency Doubler 4-9
1
MHz
Reference
Output 4-9
External Standard
Input
4-9
Power
Supply 4-9
+5V
Stabilization
4-9
-5V
Stabilization
4-9
On/Off
Switching 4-10
CDI
Chip
2V
Supply 4-10
CHAPTERS MAINTENANCE
Test
Equipment
Required
5-1
Removal
of Covers 5-2
Transformer Voltage
Selection
5-2
Voltage
Selection
Diagram
5-3
Fuses 5-4
Power Lead
5-4
Power
Supply
Check
5-4
9901
Vol.
Contents
(2)