Chapter 8 181
Hardware Options
Verifying Option 122 or 140, Wide Bandwidth Digitizer
Wide Band Analog IF Assembly Filter Path Test
This routine allows you to use the WB Align (f=300 MHz) comb cal
signal to view the filter response of the 80 MHz filter path and the 36
MHz filter paths. Also the ADC dither signal response can be seen
allowing you to determine if the dither signal is present.
The following diagnostic routine requires entering the password
protected Service menus.
1. Press
System More, More Service
2. Enter the service password -49 and press Enter
3. Service
4. Meas Setup
5. Wide Band Setup
6. Wide Band Advanced, More
7. All Freq Pts On
8. Span 100 MHz
9. RBW 150 kHz
The PSA display now shows the filter response of the 80 MHz filter
path in the Wideband Analog IF assembly. The Dither signal can be
seen on the far left hand side of the filter response. See Figure 8-6.
Figure 8-6 80 MHz Filter Response
10.Press
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