HP 33120A Manual de usuario

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HP 33120A / Option 001

Phase-Lock Assembly

Installation Instructions for Retrofit Kit

Part Number 33120-90021

October 1998

©Copyright Hewlett-Packard Company 1994, 1998

All Rights Reserved.

This guide contains information to install the Phase-Lock assembly into

the HP 33120A. This assembly can be installed only in instruments

shipped after August 1994 with serial numbers US34004078 and above.

Refer to the HP 33120A /Option 001 User’s and Service Guide (included

with the retrofit kit) for complete details on using the assembly.

Installing the Phase-Lock Assembly

1 Remove the outer cover from the HP 33120A.

HP 33120A /Option 001

Phase-Lock Assembly

Installation Instructions for 33120-80001 Retrofit Kit

Loosen

Captive

Screws

Remove

Bottom Screw

Slide Off Outer Cover

b

a

2 Carefully cut two holes in the rear-panel label.

The Ref Out and Ext Ref In terminals on the Phase-Lock assembly will

extend through these holes in the HP 33120A rear-panel.

3 Connect the coaxial cable to the Phase-Lock circuit board.

Connect one end of the coaxial cable (included with the retrofit kit) to

the connector labeled P2 on the Phase-Lock circuit board. Position the

cable as shown.

2

Cut Out Holes

Coaxial Cable (33120-61603)

P2

P2

4 Install the Phase-Lock assembly in the HP 33120A chassis.

Before installing the Phase-Lock assembly, make sure that the red and

black wires for the instrument fan are clear of the rear-panel holes.

With the Phase-Lock assembly positioned trace side up, insert the two

BNC connectors through the holes previously cut in the rear-panel label.

5 Secure the Phase-Lock assembly in place.

As shown above, place one lock washer and one hex nut (included with

the retrofit kit) on each of the two BNC connectors. To prevent cross-

threading, be sure to hand-tighten the hex nuts at least one turn before

using a tool.

3

Lock Washer (2190-0699)

Hex Nut (2940-0256)

Trace Side Up

Top View

Side View

6 Connect the coaxial cable to HP 33120A circuit board.

First, slide the black ferrite bead to the end of the coaxial cable as shown.

Then, connect the coaxial cable to connector J401 on the HP 33120A

circuit board. Be sure to position the cable away from the heatsinks on

the circuit board.

7 Connect the ribbon cable to the HP 33120A circuit board.

Connect the loose end of the grey ribbon cable to connector J102 on the

HP 33120A circuit board. Press down firmly on the ribbon cable

connector and secure the cable in place with the locking clips.

4

Ferrite Bead

J401

Ribbon

Cable J102

Snap the Locking Clips

over the top of the connector

to secure the Ribbon Cable.

Calibration /Adjustment Procedure

After installing the Phase-Lock assembly, perform the frequency

adjustment procedure (CAL:SETup 0) on page 67 in the HP 33120A

Service Guide. Be sure to make the 1 kHz frequency measurement with

an accuracy of at least 8 digits (0.01 ppm). You may be required to

perform up to three iterations of the frequency adjustment following

initial installation of the Phase-Lock assembly.

For complete details on performing a calibration, see chapter 4 in

the HP 33120A Service Guide.

5