Troubleshooting The 0 To 36 Mhz Baseband Signal Path - Agilent Technologies 89604 Installation And Vxi Service Manual

Diagnostics

Troubleshooting the 0 to 36 MHz baseband signal path

Troubleshooting the 0 to 36 MHz baseband signal path
Perform the following procedures in the order listed to troubleshoot the 89640
baseband signal path.
This test requires a signal generator. See
224).
1. Set up the 896xxA as follows:
a. If it is not already running, start the Vector Signal Analyzer by double
clicking the icon or clicking Start > (All) Programs > Agilent 89600 VSA
> Vector Signal Analyzer.
b. Click File > Preset > Preset Setup.
c. Click Utilities > Calibration, and clear the Apply Corrections to Data
checkbox.
d. Click MeasSetup > Frequency Bands > 0 - 36 MHz.
e. Disconnect the BNC cable from the E1439 Analog In connector and
connect a signal generator to E1439 Analog In.
f. Set the signal generator for 20 MHz, -30 dBm output.
g. Set the marker to peak by right clicking on the spectrum trace and clicking
↑Peak.
h. The marker reading should be 20 dBm ± 1.7 dB.
If this reading is incorrect, the E1439 module is most likely faulty.
2. Connect the signal generator output to 89605 Ch 1 Input.
a. Reconnect the BNC cable from 89605 To ADC to E1439 Analog In.
b. Set the center frequency to 20 MHz and the frequency span to 100 kHz.
c. Set the marker to peak by right clicking on the spectrum trace and clicking
↑Peak.
d. The marker reading should be -30 dBm ± 3.5 dB.
e. Change the 89640A input range in 5 dB steps while verifying that the
marker reading at each step is -30 dBm ± 3.5 dB.
If any of these readings are incorrect, the 89605 module is most likely
faulty.
3. Repeat steps 1 and 2 for a second channel if required.
246
"Recommended Test Equipment" (page
Chapter 16