MAINTENANCE MANUAL
IFR 4000
2-2-3
Page 61
Aug 1/04
(3) RF Amplitude Levels
PREREQUISITES:
Test Setup (para 2-2-3F(1)
Miscellaneous (para 2-2-3F(2)
TEST EQUIPMENT:
Measuring Receiver w/ Sensor Head
STEP PROCEDURE
1. From the Calibration Screen, press the AMPLVL CALS Soft Key to enter the
AMPL LEVEL CAL Screen.
MAIN
2. Press the MAIN Soft Key to display the MAIN AMPL LEVEL Sequence Screen.
3. Connect Measuring Receiver Sensor Head to the ANT Connector.
4. Switch between TUNED RF LEVEL and AM on the Measuring Receiver as
necessary. (For AM measurements, use the Peak
±
/2 detector, and the 3 kHz
Low-Pass Filter. Use no High Pass filtering.) (For distortion measurements, use
the 80 kHz Low-Pass Filter on the Audio Analyzer. Use no High Pass filtering.)
5. Follow the on-screen prompts and recall stored calibration levels on the
Measuring Receiver (para 2-2-3F[1], Step 2). For the MAIN AMPL LEVEL
Sequence, the AM modulation setting error must be <0.5% and the amplitude
setting error must be <0.1 dB.
6. Reference the following:
z
Step 1 of MAIN AMPL LEVEL Sequence
Turn modulation OFF to set and check RF level. Toggling the UUT
Modulation field between OFF and ON and the Measuring Receiver between
AM and TUNED RF LEVEL several times may be required to meet the
requirements of this step.
z
Step 2 of MAIN AMPL LEVEL Sequence
Once the VALUE: field has been set for minimum distortion, use the PREV
Soft Key to return to Step 1. Steps 1 and 2 are interactive; toggling between
the two is required to meet the requirements of the steps.
z
Steps 3 to 6 of MAIN AMPL LEVEL Sequence
Follow the on-screen prompts and recall the necessary calibrations on the
Measuring Receiver.
z
Steps 7 to 26 of MAIN AMPL LEVEL Sequence
Connect the Measuring Receiver Sensor Head to the RF I/O Connector.
z
Step 27 of MAIN AMPL LEVEL Sequence
Entering the frequency of 140 MHz on the Measuring Receiver displays
UNCAL and RECAL. Press the Measuring Receiver Calibrate button and
allow the cal routine to complete before setting the UUT VALUE: field.
z
Steps 28 to 29 of MAIN AMPL LEVEL Sequence
Follow the on-screen prompts and recall the necessary calibrations on the
Measuring Receiver.
7. When the MAIN AMPL LEVEL Sequence is complete, press the SAVE & RETURN
Soft Key to return to the AMPL LEVEL CAL Screen.
Summary of Contents for IFR 4000
Page 1: ...NAV COMM Test Set Maintenance Manual 1002 5600 4P0 IFR 4000...
Page 3: ...MAINTENANCE MANUAL IFR 4000 FOR QUALIFIED SERVICE PERSONNEL ONLY...
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