IFR COM-120B Service Manual

STEP
PROCED
URE
34.
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.
35. Select'10. RF
GENERATOR
-
EXTERNAL
MODULATION"
and
press
ENTER
to access
EXTERNAL MODULATION
CALIBRATION
SCREEN.
36. Cursor to EXTERNAL
MODULATION
Field
and
oress
ENTER.
37.
Scrollto
AM. Press
ENTER.
38. Set
Audio
Analyzer 1
kHz
tone to approximately
5.8
Vrms for
80% Modulation
on
the
Modulation Analyzer.
Adjust
Audio
Analyzer
output
as
required.
39. Cursor
to
MEASURED
MODULATTON
Fietd
and
press
ENTER.
40.
Use
DATA ENTRY
Keypad
to enter
Modulation
Anatyzer
reading.
41.
Press ENTER Key
and
wait
until
Field
displays CALTBRATED.
42.
Cursor to
EXTERNAL
MODULATION
Field
and
press
ENTER.
43.
Scrollto
FM
NARB l.
Press
ENTER.
44.
Set
Audio Analyzer
1 kHz
tone
to approximately
5.45 Vrms for
15 kHz
Deviation
on
the
Modulation
Analyzer.
Adjust
Audio Analyzer
output
as
required.
45.
Cursor
to
MEASURED
DEV|AT|ON
Fietd
and
press
ENTER.
46.
Use DATA ENTRY
Keypad
to enter Modulation Analyzer
reading.
47.
Press ENTER Key
and
wait
until
Field
displays
CALTBRATED.
48.
Repeat
Steps
43
through
47
tor
the remaining
FM
calibrations
using
this
table as
a
guide:
E xternal
Modulatlon
Devlatlon
Range
(kHz)
Audlo
Analyzer
(=Vrms)
FM
NARR
2
10
7.20
FM NARR
3
I
3.63
FM WIDE
50
3.66
49.
Cursor to EXTERNAL
MODULATION
Fietd
and
press
ENTER.
50.
Scroll
to
PM NARR
1. Press
ENTER.
51.
Set
Audio Analyzer
1 kHz
tone
to approximately
5.45 Vrms for
15
Rad Deviation
on
the
Modulation
Analyzer.
Adjust
Audio
Analyzer
output
as required.
1-27
STEP
PROCEDURE
34. 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.
35. Select "10. RF GENERATOR - EXTERNAL MODU LATION" and press ENTER to access
EXTERNAL MODULATION CALIBRATION SCREEN.
36. Cursor to EXTERNAL MODULATION Field and press ENTER.
37. Scroll to AM. Press ENTER.
38. Set Audio Analyzer 1 kHz tone to approximately 5.8 Vrms for 80% Modu lation on the
Modulation Analyzer. Adjust Audio Analyzer output as required.
39. Cursor to MEASURED MODULATION Field and press ENTER.
40. Use DATA ENTRY Keypad to enter Modulation Analyzer reading.
41. Press ENTER Key and wait until Field displays CALIBRATED.
42. Cursor to EXTERNAL MODULATION Field and press ENTER.
43. Scroll to FM NARR 1. Press ENTER.
44. Set Audio Analyzer 1 kHz tone to approximately 5.45 Vrms for 15 kHz Deviation on the
Modulation Analyzer. Adjust Audio Analyzer output as required.
45. Cursor to MEASURED DEVIATION Field and press ENTER.
46. Use DATA ENTRY Keypad to enter Modulation Analyzer reading.
47. Press ENTER Key and wait until Field displays CALIBRATED.
48. Repeat Steps 43 through 47 for the remaining FM calibrations using this table as a guide:
External Deviation
Audio
Modulation Range (kHz)
Analyzer
(::::Vrms)
FM NARR 2
10
7.20
FM NARR 3
1
3.63
FM WIDE
50 3.66
49. Cursor to EXTERNAL MODULATION Field and press ENTER.
50. Scroll to PM NARR 1. Press ENTER.
51. Set Audio Analyzer 1 kHz tone to approximately 5.45 Vrms for 15 Rad Deviation on the
Modulation Analyzer. Adjust Audio Analyzer output as required.
1-27
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

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