IFR COM-120B Service Manual

STEP
PROCED
U
RE
6. Connect Signal Generator
to 87A12J1
(Figure
1-6).
Set
Signal Generator
for
10.7 MHz
signal at
-2O
dBm.
7. Measure dc
voltage
at 87A12TP2A2
(Figure
1-6). Adjust
Signal Generator Output
for
1.4 Vdc
on
DMM.
8. Cursor to Center
Frequency,
press
Set
Ref
Soft
Function Key F1. Note Trace
peak
level.
9.
Disconnect Signal Generator
from
87A12J1
(Figure
1-6).
Connect
W24
to 87A12J1
(Figure
1-6).
10.
Set Signal Generator
for 100 MHz
at
-40
dBm. Connect Signal Generator to
ANTENNA
Connector
(7).
11. Verify Trace
peak
level matches reference level from
Step I
(t2
dBm). Adjust
87412R113
(Figure
1-6)
as
required.
Labeled
as
Analyzer lF
Gain.
12. With
Cursor on Center
Frequency,
press
Set
Ref
Soft
Function Key
F1.
13.
Set Scan
Width
to
100 kHz.
Note
Signal
Level.
14.
Set Scan
Width
to
10 MHz,500 kHz, 10 kHz
and
I kHz.
Verify
Signal
Level matches
Reference
(Step
12) tor
each Scan
Width
setting
(12
dB).
lf
in
tolerance,
go
to
Step 32.
PERFORM STEPS
15 THROUGH
32 ONLY
WHEN REQUIRED.
15.
Set COM-1208
Main
Power
Switch to OFF.
16. Disconnect
coaxial cables
f rom Analyzer
Tray.
17. Remove Analyzer Tray from
COM-1208.
Install Analyzer
Tray Extender
Card
in
COM-1208.
lnstall Analyzer Tray
on
Analyzer Tray Extender Card.
18.
Connect
Extender Coaxial Cables to
Analyzer Tray
coaxial cables using SMB-SMB
adapters.
lnstall
Extender Coaxial Cables
to
Analyzer Tray.
19.
Set COM-1208
Main Power
Switch to ON.
Apply Power
to COM-1208.
Allow
5
minute
warm-up
period.
20. Press ANLYZ lnstruments Key
(a)
to access Spectrum
Analyzer Operation Screen.
21.
Set Scan
Width
to
100 kHz. Note
Signal
Level.
22.
Set Scan
Width
to 500
kHz.
Verify
Signal
Level matches Reference
(Step
21)
(12
dB).
Adjust
87l.12R221 as
necessary
(Figure
1-7).
23.
Set Scan
Width
to
10 kHz.
Verify
Signal
Level matches Reference
(Step
21)
(r2
dB).
Adjust
87
A12R254
as
necessary
(Figure
1-7).
24.
Set Scan
Width to
1 kHz. Verify
Signal
Level matches Reference
(Step
21)
(t2
dB).
Adjust
87
412R286
as
necessary
(Figure
1-7).
25.
Set
Scan Width
to
10
MHz. Note
Siqnal
Level.
1-30
STEP
PROCEDURE
6. Connect Signal Generator to 87A12J1 (Figure 1-6). Set Signal Generator for 10.7 MHz
signal at -20 dBm.
7. Measure dc voltage at 87 A 12TP202 (Figure 1-6). Adjust Signal Generator Output for
1.4 Vdc on DMM.
8. Cursor to Center Frequency, press Set Ref Soft Function Key F1. Note Trace peak level.
9. Disconnect Signal Generator from 87A12J1 (Figure 1-6). Connect W24 to 87A12J1 (Figure
1 -6).
10. Set Signal Generator for 100 MHz at -40 dBm. Connect Signal Generator to ANTENNA
Connector (7).
11. Verify Trace peak level matches reference level from Step 8 (±2 dBm). Adjust 87 A 12R113
(Figure 1-6) as required. Labeled as Analyzer IF Gain.
12. With Cursor on Center Frequency, press Set Ref Soft Function Key F1.
13.
Set Scan Width to 100 kHz. Note Signal Level.
14. Set Scan Width to 10 MHz, 500 kHz, 10 kHz and 1 kHz. Verify Signal Level matches
Reference (Step 12) for each Scan Width setting (±2 dB). If in tolerance, go to Step 32.
PERFORM STEPS 15 THROUGH 32 ONLY WHEN REQUIRED.
15. Set COM-120B Main Power Switch to OFF.
16. Disconnect coaxial cables from Analyzer Tray.
17. Remove Analyzer Tray from COM-120B. Install Analyzer Tray Extender Card in
COM-120B. Install Analyzer Tray on Analyzer Tray Extender Card.
18. Connect Extender Coaxial Cables to Analyzer Tray coaxial cables using 5MB-SMB
adapters. Install Extender Coaxial Cables to Analyzer Tray.
19. Set COM-120B Main Power Switch to ON. Apply Power to COM-120B. Allow 5 minute
warm-up period.
20. Press ANLYZ Instruments Key (4) to access Spectrum Analyzer Operation Screen.
21. Set Scan Width to 100 kHz. Note Signal Level.
22. Set Scan Width to 500 kHz. Verify Signal Level matches Reference (Step 21) (±2 dB).
Adjust 87 A 12R221 as necessary (Figure 1-7).
23. Set Scan Width to 10 kHz. Verify Signal Level matches Reference (Step 21) (±2 dB).
Adjust 87 A 12R254 as necessary (Figure 1-7).
24. Set Scan Width to 1 kHz. Verify Signal Level matches Reference (Step 21) (±2 dB).
Adjust 87 A 12R286 as necessary (Figure 1-7).
25. Set Scan Width to 10 MHz. Note Signal Level.
1-30
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

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