Agilent Technologies 8751A Quick start guide

8751A-17

SUPERSEDES: None

Continued

DATE: 15 April 1995

8751A Network Analyzer

Serial Numbers: 0000J00000 / 3146J00696

0000A00000/3146A00212

Duplicate Service Notes: None

Modification to fix unexptected spurious problem.

To Be erformed By: Agilent-Qualified Personnel

arts Required:

1 of 3

AUTHOR: MT ENTITY: 3355

PRINTED IN U.S.A.

SERVICE NOTE

ADMINISTRATIVE INFORMATION

MODIFICATION RECOMMENDED

SERVICE NOTE CLASSIFICATION:

ACTION

CATEGORY:

LOCATION

CATEGORY:

CUSTOMER INSTALLABLE

ON-SITE

SERVICE CENTER

RESPONSIBILE UNTIL: 15 Apr l 1995

ADDITIONAL INFORMATION:

IMMEDIATELY

ON SPECIFIED FAILURE

AGREEABLE TIME

AVAILABILITY: PRODUCT’S SUPPORT LIFE

RETURN

SCRAP

SEE TEXT

SERVICE

INVENTORY:

RETURN

SCRAP

SEE TEXT

USED

PARTS:

STANDARDS:

Labor 2.0 hrs

art No. Qty Description

1901-0050 1 Diode

0757-02 0 1 Resistor 1K

069 -3444 1 Resistor 316

9100-354 1 Inductor 470 NH

1 54-1073 1 Transistor

0160-4 32 1 Capacitor 0.01 UF

069 -3441 1 Resistor 215

Page 2 Serv ce Note 8751A-17

Situation:

The 751A may show the unexpected spurious response due to the parasitic oscillation

of the source signal.

Solution:

This is caused by the breakdown of A3Q2 transistor. This symptom can be confirmed

using the following procedures:

1. Set the 751A as follows:

CENTER --> 500 MHz

SPAN --> 0 Hz

2. Connect the Spectrum Analyzer to the 751A’s “RF OUT”, and observe the signal

with 1 MHz frequency span.

3. Connect the Signal Generator to “EXT REF IN” on the rear panel. Set the Signal

Generator to 10 MHz.

4. Change the frequency of Signal Generator from 9.999 MHz to 10.0002 MHz.

Observer the 751A’s ouput signal using the Spectrum Analzyer. If a spurious is

observed, the A3Q2 transistor is broken.

Action:

Modify the A3 board with referring the following procedures:

1. Turn the 751A off. Remove the top cover and the shield plate.

2. Remove the A3 board.

3. Modify the A3 board with referring Figure 1:

a. Replace the A3Q2 transistor (P/N 1 54-1073) with the new one.

b. Replace the R3 resistor. 464 ohm --> 1 kohm (P/N 0757-02 0)

c. Replace the R6 resistor. 464 ohm --> 316 ohm (P/N 069 -3444)

d. Replace the L2 inductor. 6 0 nH --> 470 nH (P/N 9100-354 )

e. Replace the location of C5 (0.01 uF, P/N 0160-4 32) and R19 (215 ohm, P/N

069 -3441).

f. Add the diode (P/N 1901-0050) with referring Figure 1.

4. Perform the following adjustments:

100 MHz VCXO Frequency

Fractional N Osc Spurious

1st IF Offset Osc Frequency

LF power linearity

5. Reinstall the A3 board.

Page 3Serv ce Note 8751A-17

Other Agilent Technologies Measuring Instrument manuals

Agilent Technologies

Agilent Technologies Acqiris U10 Series User manual

Agilent Technologies

Agilent Technologies Flow Tracker 1000 User manual

Agilent Technologies

Agilent Technologies Flow Tracker Series User manual

Agilent Technologies

Agilent Technologies E4440A Quick start guide

Agilent Technologies

Agilent Technologies 8753ET User manual

Agilent Technologies

Agilent Technologies 4263B User manual

Agilent Technologies

Agilent Technologies Agilent 4396B User manual

Agilent Technologies

Agilent Technologies 8712ET Manual

Agilent Technologies

Agilent Technologies PN 8510-16 Quick start guide

Agilent Technologies

Agilent Technologies 4263B User manual

Agilent Technologies

Agilent Technologies E4418B User manual

Agilent Technologies

Agilent Technologies ADM series User manual

Agilent Technologies

Agilent Technologies FieldFox MW N9913A User manual

Agilent Technologies

Agilent Technologies TS-5410 Operating instructions

Agilent Technologies

Agilent Technologies 4338B User manual

Agilent Technologies

Agilent Technologies N9030A User manual

Agilent Technologies

Agilent Technologies 8590 Series User manual

Agilent Technologies

Agilent Technologies 85032B/E 50 Manual

Agilent Technologies

Agilent Technologies ESA Series User manual

Agilent Technologies

Agilent Technologies PSA Series User manual

Agilent Technologies

Agilent Technologies Agilent 7890 Series Guide

Agilent Technologies

Agilent Technologies PSA Series Quick start guide

Agilent Technologies

Agilent Technologies 4284A Installation guide

Agilent Technologies

Agilent Technologies PSA Series User manual

Popular Measuring Instrument manuals by other brands

Suaoki

Suaoki D40 user manual

Elster

Elster BK-G1.6 operating instructions

Endress+Hauser

Endress+Hauser Deltabar FMD71 technical information

Duratool

Duratool D03128 manual

Vega

Vega VEGAPULS 65 Quick setup guide

Tonghui

Tonghui TH2618B Operation manual

Tenmars

Tenmars TM-801 user manual

MSR

MSR 145 user manual

TPS

TPS WP-82 manual

ELMETRON

ELMETRON CP-511 user manual

PCB Piezotronics

PCB Piezotronics 003C30 Installation and operating manual

Tenma

Tenma 72-10465 manual

Endress+Hauser

Endress+Hauser Proline Promag 50 Brief operating instructions

Siemens

Siemens SITRANS F Coriolis FCT030 Function manual

KLINGER

KLINGER CMF V Series instruction manual

EXFO

EXFO FTB-2 Notice

Keysight

Keysight M8290A Getting started guide

ADTEK

ADTEK MW-5 operating manual