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If the trace is similar to Figure 8-2, the sampler is good. Therefore, the
n
coupler is lossy and should be replaced. Minor power variations are
probably due to the flexible cable and are of no concern.
If the trace is abnormally low, the coupler is good and the sampler is at
n
fault. Troubleshoot the associated sampler by referring to "Sampler Voltage
Check. n
A and B Sampler Check by Substitution
1. For, the HP 87I9D/zOD, set the,, output power to -10 dDm by pressing (Menu)
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2.
For the HP 3722D, set the output power to -15,dI3m by presng lMenuJ
3. Connect a 3.5~mm (f) to 2.4~mm (m) adaptor to one end of the RF flexible
cable that is supplied with the tool kit.
4. Connect the RF flexible cable from the output of the A69 step attenuator
Figure 8-2. Directional Coupler Bypassed
Receiver Troubleshooting R-7
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Table of Contents
Troubleshooting
