Agilent Technologies HP 8719D Service Manual page 229

The power should be at least -32 dBm (-27 dBm, Option 007).
4.
The power should
5. You may have to change the DAC number slightly to achieve a good power
reading. If power is correct, proceed with "Check Al2 Reference."
6.
If the power level is not correct, connect a power meter to the output of Sl
leading to the A58 M/A/D/S, and check the power of the YIG oscillator.
High band power should be greater than + 3 dBm for DAC numbers from
n
2400 to 4095.
Mid band power should be greater than + 5 dBm for DAC numbers from
n
3300 to 4095.
Low band power should be greater than -2 dBm for DAC numbers from
n
3700 to 4095.
7. Low power in high or mid band indicates a problem with the associated
YIG or switches. Trace back along the signal path to find where the
8. If no power is present, refer to "A51 Test Set Interface Power Supplies" at
the end of this section, to check the bias voltages to the YIGs. If the voltages
are correct, replace the YIG.
Check A12 Reference
1
2. The analyzer should display ANALOG BUS INPUT 14 1OOkHz cnt : .I00 MHz
3. Press L17) @ to check the 1 MHz signal.
The analyzer should display 17 PL Ref cnt : 1.000 MHz
4. If either counter reading is incorrect, the Al2 reference assembly is probably
faulty and should be replaced. However, it is also possible that there is a
faulty counter, Al4 fractional-N digital, or A10 digital IF assembly.
be
at least -27 dBm (-22 dBm, Option 007).
Troubleshooting 7-8