IFR COM-120B Service Manual

1-8-12 MIXER
NULL
CALIBRATION
PRE
REQU ISITES:
EQU IPMENT
REOUIRED:
FIGURES:
STEP
1-8-1 POWER
SUPPLY CALIBRATION
1-8-2
TCXO/OCXO
CALIBRATION
NONE
1-8
PROCEDURE
1.
2.
3.
4.
5.
6.
7.
8.
Apply Power
to COM-120B.
Allow
5
minute
warm-up
period.
Press
ANLYZ
Instruments
Key
(4)
to access Spectrum
Analyzer
Operation Screen.
Set Spectrum
Analyzer Fields as
follows:
Scan
Width
Logarithmic
Function
Tracking Generator
Mode
Attenuation
RF Input
Scale
Center
Frequency
1 MHz
dBm
OFF
L'VE
0dB
ANT
10
dB
0.2500
MHz
Verify Zero Frequency
Response is )1.5 Major
Divisions
down
from top
go
to Step 6.
Set
COM-1208
power
to OFF and disconnect test
equipment.
PERFORM
THE FOLLOWING
ONLY
WHEN REQUIRED.
Set COM-1208
Main Power
Switch
(25)
to OFF.
Disconnect
coaxial
cables and
remove Receiver Tray
f rom
COM-1208.
f
nstall Receiver Extender
Tray into
COM-1208.
Install Receiver
Ribbon
Receiver
Extender Tray
and
Receiver
Ttay.
Connect coaxial cables.
of screen.
lf not.
Cable
between
9.
10.
11.
Apply Power
to COM-1208.
Allow
5
minute warm-up
period.
Press ANLYZ Instruments Key
(a)
to access Spectrum
Analyzer Operation Screen.
Set Spectrum
Analyzer
Fields
as
follows:
Scan
Width
Logarithmic
Function
Tracking Generator
Mode
Attenuation
RF lnout
Scale
Center
Frequency
1 MHz
dBm
OFF
L'VE
0dB
ANT
10
dB
A.250 MHz
1-36
1-8-12 MIXER NULL CALIBRATION
PREREQUISITES:
EQUIPMENT REQUIRED:
FIGURES:
STEP
1-8-1 POWER SUPPLY CALIBRATION
1-8-2 TCXO/OCXO CALIBRATION
NONE
1-8
PROCEDURE
1. Apply Power to COM-120B. Allow 5 minute warm-up period.
2. Press ANL YZ Instruments Key (4) to access Spectrum Analyzer Operation Screen.
3. Set Spectrum Analyzer Fields as follows:
Scan Width
Logarithmic Function
Tracki ng Generator
Mode
Attenuation
RF Input
Scale
Center Frequency
1 MHz
dBm
OFF
LIVE
o dB
ANT
10 dB
0.2500 MHz
4. Verify Zero Frequency Response is ~1.5 Major Divisions down from top of screen. If not,
go to Step 6.
5.
Set COM-120B power to OFF and disconnect test equipment.
PERFORM THE FOLLOWING ONLY WHEN REQUIRED.
6. Set COM-120B Main Power Switch (25) to OFF.
7. Disconnect coaxial cables and remove Receiver Tray from COM-120B.
8. Install Receiver Extender Tray into COM-120B. Install Receiver Ribbon Cable between
Receiver Extender Tray and Receiver Tray. Connect coaxial cables.
9. Apply Power to COM-120B. Allow 5 minute warm-up period.
10. Press ANL YZ Instruments Key (4) to access Spectrum Analyzer Operation Screen.
11. Set Spectrum Analyzer Fields as follows:
1-36
Scan Width
Logarithmic Function
Tracking Generator
Mode
Attenuation
RF Input
Scale
Center Frequency
1 MHz
dBm
OFF
LIVE
o dB
ANT
10 dB
0.250 MHz
Scans by ArtekMedia © 2008

IFR COM-120B Specifications

General

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