Installation guide

Assembly Replacement
AT1 High-Power Mechanical Attenuator (Option UNB)
2-65
AT1 High-Power Mechanical Attenuator (Option UNB)
NOTE On signal generators equipped with an RPP, refer to “AT1 High-Power Mechanical Attenuator
(Option UNB) with A28 Reverse Power Protection (Option 501, 502, 503, 504 or Option UNJ)”
on page 2-63 for removal instructions. The following procedure is primarily for Option 506.
Tools Required
• T-10 driver
• 5/16” open ended wrench
Removal Procedure
Refer to Figure 2-33 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to “Outer and Inner Instrument Covers” on page 2-4.
3. On signal generators equipped with an RPP, refer to “AT1 High-Power Mechanical Attenuator (Option
UNB) with A28 Reverse Power Protection (Option 501, 502, 503, 504 or Option UNJ)” on page 2-63 for
removal instructions.
4. Using the 5/16” open ended wrench:
• disconnect W50
• disconnect W59
On signal generators with Option 1EM, disconnect W91. (Refer to “Option 506 - Option 1EM
Semi-Rigid Cables includes the A21 YTO Driver (Option UNJ or Option 506) and the AT1 High-Power
Mechanical Attenuator (Option UNB) with an A29 DC Blocking Capacitor (Option 506)” on page 3-70.)
5. Disconnect W57 from A23J25.
6. Using the T-10 driver, remove the two screws (1) that attach the AT1 High-Power Mechanical Attenuator
(Option UNB) to the chassis.
7. Tilt the AT1 bracket away from the chassis and slide out the tabs from the slots.
There are two hinged tabs at the bottom of the AT1 bracket that fit into slots in the signal generator’s
chassis.
8. Using the T-10 driver, remove the two screws (2) that attach the AT1 bracket
to the AT1 High-Power Mechanical Attenuator (Option UNB).
9. Remove the AT1 High-Power Mechanical Attenuator (Option UNB).
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all T-10 screws to 9 in-lbs.