Keysight Technologies E8257D Service Manual page 388

Assembly Replacement
AT1 115 dB Attenuator (Option 1EM)
4. Perform the post–repair adjustments and performance tests that pertain
Figure 3-76 AT1 115dB Attenuator (Option 1EM)
Option 521 – W46
Options 503/509/513/520/540 – W73
Options 532/544 – W85
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to this removal procedure.
AT1
E8257D/67D, E8663D PSG Signal Generators Service Guide
Option 521 – W147
Options 503/509/513/520/540 – W72
Options 532/544 – W93