130 Chapter 6
Troubleshooting the IF Section
Verifying the A10 Third Converter Board E4440A, E4443A, E4445A, E4446A, E4448A)
Option AYZ IF Input Check
This procedure will check for proper gain through the 3
rd
converter
when the external mixing path is enabled.
Setting the Synthesized Sweeper Power Level
1. Zero and calibrate the low-power sensor and power meter in dBm
mode using the 30 dB reference attenuator. Enter the 300 MHz
calibration factor of the power sensor into the power meter.
2. Connect an SMA cable from the output of a source to the power
sensor using an adapter between the cable and the power sensor.
3. Set the source frequency to 321.4 MHz. Adjust the source power
level for a power meter reading of −30 dBm ± 0.1 dB.
4. Record the power meter reading as Input Power.
Input Power ___________ dBm
Measuring the IF INPUT Accuracy
5. Connect the SMA cable from the RF OUTPUT of the source to the IF
INPUT of the analyzer.
6. Press
Preset on the analyzer. Press Factory Preset, if it is displayed.
Set the analyzer by pressing the following keys:
Amplitude, More 1 of 2, Corrections, Apply Corrections No
Input/Output
, Input Mixer, Input Mixer Ext
Ext Mix Band
, 26.5-40 GHz
FREQUENCY
, 30 GHz
SPAN
, Zero Span
BW/Avg
, Res BW, 1 kHz
7. Press Peak Search on the analyzer. Record the marker (Mkr1)
amplitude reading as the Measured Power.
Measured Power ___________ dBm
8. Subtract the Input Power (step 4) from the Measured Power (step 7)
and record the difference as the IF INPUT Accuracy.
IF INPUT Accuracy = Measured Power − Input Power
For example, if the Measured Power is −29.98 dBm and the Input
Power is −30.08 dBm, the IF INPUT Accuracy would be 0.1 dB.
9. The IF INPUT accuracy should be less than ±0.3 dB.
10.If the IF INPUT accuracy exceeds ±0.3 dB perform the IF Input
adjustment before troubleshooting a faulty 3
rd
converter or variable
gain range from the A13 Front End Driver.
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