Agilent Technologies 8753ES Option 011 Service Manual page 63

47.Use the analyzer front panel knob to move marker 2 to the peak value between 1.3 GHz
and 3 GHz. Write the marker 2 reading on the performance test record under "R Return
Loss (A/B)," 1.3–3 GHz.
48.For Option 006:
a. Press
MARKER 1
to 3 GHz and 6 GHz respectively.
b. Use the analyzer front panel knob to move marker 2 to the peak value between
3 GHz and 6 GHz. Write the marker 2 reading on the performance test record under
"R Return Loss A/B," 3 GHz–6 GHz.
In Case of Difficulty
1. Check your test setup for damage or excessive wear of the input connectors.
2. Impedance mismatch may also be caused by the samplers, or the semirigid cables
connecting the A4/A5/A6 sampler mixer assemblies to the analyzer front panel type-N
connectors. Check for damaged semirigid cables. If no damage is apparent at the input
connectors, try interchanging the sampler assemblies. If the problem goes away, the
sampler which you just swapped is defective. If the problem still exists, suspect the path
from the type-N connector input to the sampler assembly.
3. Consult Chapter 8 , "Receiver Troubleshooting,"
Chapter 2
MARKER 2
3 G/n
11. Receiver Input Impedance
to set marker 1 and marker 2
6 G/n
for troubleshooting information.
Performance Tests
2-47