IFR COM-120B Service Manual

STEP PROCEDURE
8.
Press
EXEC
Soft
Function Key F5.
9.
Press
RETURN
Soft
Function Key F6
to
return
to
RF Receive
Operation
Screen.
10.
Connect
Test
Equipment
as shown
in Figu re 1-9.
11. Access Full
Screen Deviation Meter.
'
"
12.
Set
FM
Deviation
Meter Parameters
as
follows:
Scope/Demod
Coupling
AC
Range
20 kHz
Peak
Hold
OFF
Average
OFF
13.
Set Signal
Generator
for
101 MHz
Signal
FM Modulated
with
1 kHz
tone at 10 kHz
deviation
at
-10
output level.
14.
Set
Modulation
Analyzer for FM Measurement
with
300
Hz
High-Pass Filter,3
kHz
Low-Pass Filter
and
Peak+
detector
activated.
15. Verify
Modulation
Analyzer reading
and
FM Deviation
Meter Reading
match
(11.1
kHz). lf
not,
go
to Step 18.
1
6. Set
Range
to 50
kHz.
17.
Set Signal
Generator tor 20 kHz Deviation.
18. Verify
Modulation
Analyzer reading
and
FM
Deviation Meter
Reading match
(r2.6
kHz). lf
not,
go
to Step
18.
19.
Set Range
to
100
kHz.
20.
Set Signal
Generator
for
50 kHz Deviation.
21. Verify Modulation
Analyzer
reading
and
FM
Deviation Meter Reading
match
(15.1
kHz). lf
not,
go
to
Step
18.
22.
Set COM-120B
power
to OFF and
disconnect test equipment.
PERFORM
THE FOLLOWING
ONLY
WHEN
REQUIRED.
23. Press
SETUP MEMORY Key
(21).
24.
Select
"1.
Calibration"
f
rom
Setup Screen.
25. Press
ENTER Key
to access
Password
Field.
Press
SHIFT,
F,
M, Y,
S,
V,
C, D and
SHIFT
Data Entry
Keys
(5).
Press
ENTER Key.
26.
Select
"11.
FM DEVIATION
METER"
to access
FM
DEVIATION METER
CALIBRATION
Screen.
27.
Set Signal
Generator
for
10
kHz
deviation.
1-39
STEP
PROCEDURE
8. Press EXEC Soft Fu nction Key FS.
9.
Press RETURN Soft Function Key F6 to return to RF Receive Operation Screen.
10. Connect Test Equipment as shown in Figure 1-9.
11. Access Full Screen Deviation Meter.
12. Set FM Deviation Meter Parameters as follows:
Scope/Demod Coupling
Range
Peak Hold
Average
AC
20 kHz
OFF
OFF
13. Set Signal Generator for 101 MHz Signal FM Modulated with 1 kHz tone at 10kHz
deviation at -10 output level.
14. Set Modulation Analyzer for FM Measurement with 300 Hz High-Pass Filter, 3 kHz
Low-Pass Filter and Peak+ detector activated.
1S. Verify Modulation Analyzer reading and FM Deviation Meter Reading match (±1.1 kHz). If
not, go to Step 18.
16. Set Range to 50 kHz.
17. Set Signal Generator for 20 kHz Deviation.
18. Verify Modulation Analyzer reading and FM Deviation Meter Reading match (±2.6 kHz). If
not, go to Step 18.
19.
Set Range to 100 kHz.
20. Set Signal Generator for SO kHz Deviation.
21. Verify Modulation Analyzer reading and FM Deviation Meter Reading match (±S.1 kHz). If
not, go to Step 18.
22. Set COM-120B power to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED.
23. Press SETUP MEMORY Key (21).
24. Select "1. Calibration" from Setup Screen.
2S. Press ENTER Key to access Password Field. Press SHIFT, F, M, Y, S, V, C, D and SHIFT
Data Entry Keys (S). Press ENTER Key.
26. Select "11. FM DEVIATION METER" to access FM DEVIATION METER CALIBRATION
Screen.
27. Set Signal Generator for 10kHz deviation.
1-39
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

Brand	IFR
Model	COM-120B
Category	Measuring Instruments
Language	English