Racal Instruments 9915 Manuals

Racal Instruments 9915 Manuals

Manuals and User Guides for Racal Instruments 9915. We have 1 Racal Instruments 9915 manual available for free PDF download: Service Manual

Racal Instruments 9915 Service Manual

Racal Instruments 9915 Service Manual (87 pages)

UHF Frequency Meter

Brand: Racal Instruments | Category: Measuring Instruments | Size: 5.79 MB

Table of Contents

Table of Contents
3
Carrying Handle
21
Description of Controls
22
Indicators
23
Rear Panel Items
24
The CDI Chip
25
Dynamic Display System
26
General Circuit Functions
26
Mul Tiplex Readout
27
Decimal Point
28
Resistor Arrays
28
A' Channel Input
30
Introduction
30
Signal Path
30
Techn Ical Description
30
Channel Overload Protection
31
P. I. N. Diode Attenuator
31
Automatic Gain Control
32
B' Channel Input
32
Counter Enable Circuit
32
Signal Input
32
B ' Channel Amplifier
33
Channel Switching
33
Generator 4
33
Input Selection
33
Input Signal Steering
33
Ancillary Steering Functions
35
Burst Mode
35
Hold/Reset
35
One-Second Gate
35
Summary
35
Burst Circuit
36
Data Output and Display System
37
Data Output Format
37
Decimal Point Selection
37
Function of Q21 and Q22
37
Multiplex Readout and Display
37
Gate/Charging Indicator LP3
38
Overflow Indicator LP1
38
AC Supply
39
Power Supply
39
Standby Indi Cator
39
Battery Economy Operation
40
Battery Powered Operation
42
Charge Indicator
42
Battery Low Indi Cator
43
Frequency Standard
43
Over-Discharge Protection
43
External Standard Input
44
Frequency Doubler
44
LF Multiplier Assembly (Option)
44
Mhz Reference Output
44
Chapter 5 Maintenance

47
- Removal of Covers
  48
- Transformer Voltage Selection
  48
- Fuses
  50
- Power Lead
  50
- Power Supply Check
  50
- Sensitivity Check: Input 'B
  52
- Sensitivity Check: Input 'A
  54
- Overload Indicator Check
  55
- Standby (Battery Economy) Check
  56
- Battery Charging Checks
  56
- Dismantling
  59
- Removal of Display PCB
  59
- Removal of Main PCB
  59

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