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1401: Difference between revisions
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To bench test the attenuator with DC, use a 50 Ω terminator on SMA input and connect the output SMA to an ohm meter. | To bench test the attenuator with DC, use a 50 Ω terminator on SMA input and connect the output SMA to an ohm meter. | ||
Each of the seven steps should read around 50 Ω. | Each of the seven steps should read around 50 Ω. | ||
The contacts on the ceramic attenuator elements can wear, they can be repaired with silver solder. | The contacts on the ceramic attenuator elements can wear, they can be repaired with silver-bearing solder. | ||
Before reassembly, remove the two SMA housings to avoid damaging the contacts and remove the setscrews | Before reassembly, remove the two SMA housings to avoid damaging the contacts and remove the setscrews | ||
that hold spring tension on the two ball bearings that align the shaft steps. | that hold spring tension on the two ball bearings that align the shaft steps. | ||