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Racal Instruments Manuals
Measuring Instruments
9915
Service manual
Racal Instruments 9915 Service Manual
Uhf frequency meter
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Contents
Table of Contents
Bookmarks
Table of Contents
Table of Contents
Carrying Handle
Description of Controls
Indicators
Rear Panel Items
The CDI Chip
Dynamic Display System
General Circuit Functions
Mul Tiplex Readout
Decimal Point
Resistor Arrays
A' Channel Input
Introduction
Signal Path
Techn Ical Description
Channel Overload Protection
P. I. N. Diode Attenuator
Automatic Gain Control
B' Channel Input
Counter Enable Circuit
Signal Input
B ' Channel Amplifier
Channel Switching
Generator 4
Input Selection
Input Signal Steering
Ancillary Steering Functions
Burst Mode
Hold/Reset
One-Second Gate
Summary
Burst Circuit
Data Output and Display System
Data Output Format
Decimal Point Selection
Function of Q21 and Q22
Multiplex Readout and Display
Gate/Charging Indicator LP3
Overflow Indicator LP1
AC Supply
Power Supply
Standby Indi Cator
Battery Economy Operation
Battery Powered Operation
Charge Indicator
Battery Low Indi Cator
Frequency Standard
Over-Discharge Protection
External Standard Input
Frequency Doubler
LF Multiplier Assembly (Option)
Mhz Reference Output
Chapter 5 Maintenance
Removal of Covers
Transformer Voltage Selection
Fuses
Power Lead
Power Supply Check
Sensitivity Check: Input 'B
Sensitivity Check: Input 'A
Overload Indicator Check
Standby (Battery Economy) Check
Battery Charging Checks
Dismantling
Removal of Display PCB
Removal of Main PCB
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9915
UHF Frequency Meter
Service Manual
Courtesy of:-
Racal_Dana user group
Click to join Racal_Dana
Please enjoy responsibly ☺
G0RSQ
th
29
June 2015
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Summary of Contents for Racal Instruments 9915
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9915 UHF Frequency Meter Service Manual Courtesy of:- Racal_Dana user group Click to join Racal_Dana Please enjoy responsibly ☺ G0RSQ June 2015...
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Page 22: Description Of Controls
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Page 24: Rear Panel Items
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Page 25: The Cdi Chip
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Page 26: General Circuit Functions
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Page 27: Mul Tiplex Readout
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Page 28: Decimal Point
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Page 33: B ' Channel Amplifier
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Page 35: Ancillary Steering Functions
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Page 36: Burst Circuit
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Page 37: Function Of Q21 And Q22
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Page 38: Overflow Indicator Lp1
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Page 39: Power Supply
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Page 40: Battery Economy Operation
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Page 42: Charge Indicator
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Page 43: Battery Low Indi Cator
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Page 44: Frequency Doubler
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Page 47: Chapter 5 Maintenance
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Page 48: Removal Of Covers
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Page 50: Fuses
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Page 52: Sensitivity Check: Input 'B
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Page 54: Sensitivity Check: Input 'A
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Page 55: Overload Indicator Check
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Page 56: Standby (Battery Economy) Check
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Page 59: Dismantling
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