HP 3575A - User Manual

t:
OPERATING AND SERVICE MAttIUAT
MODEL 3575A
GAIN.PHASE
M ETER
Scrial
Number: 1.150A016.16
IMPO BTANT NOTICE
Th
s loose leaf rnanual does
not require
a
change
sheet.
All change information
has been inteqrated into
rhe
manual
by meansof r-"vised
pages
Each revised
page
rs denlified by a revsion letler
located al the boltorn of the
page.
A reference,
locared directly below the
revislon lerter, indicates which of the backdating
changes in
Appendix C apply to that
page.
lf the serial number
of
yoLrr
nstrurnent rs lower
than
the one on this title
page,
the manual contains
revisions
thar may nor appy to
your
nstrument. Refer to Appendix c
for
complete
birck dat ing information.
-hp'
Port No.
0.1575'90002
(Completc
Ilanual includins Binder)
Nlicrofiche No.
0-3 575-9005.1
Ci)pyright
HervlettJ']ackard
Conrpanl'
1972
P. O.
tsox 301. Lovclund. Colorado
80517
U. S. A.
MA
P nted: June 1976

HP 3575A Specifications

General

Brand	HP
Model	3575A
Category	Measuring Instruments
Language	English

Summary

Section I General Information

1-10. Specifications

Detailed technical specifications controlled by tolerances for critical parameters.

Section II Installation and Interfacing

2-5. Power Requirements

Details operating voltage, frequency, and power dissipation requirements.

2-9. Grounding Requirements

Guidelines for proper grounding to ensure safety and accurate performance.

2-13. Installation

Instructions for bench and rack mounting the instrument.

2-22. Interfacing (Options 002, 003 only)

Specific interfacing information for instruments with Options 002 and 003.

Section III Operating Instructions

3-3. Controls and Indicators

Description of all front and rear panel controls, connectors, and indicators.

3-6. Input Connections

Guidance on connecting input signals to the 3575A using various cable types.

3-8. Grounding and Termination

Importance of proper grounding and termination for accurate amplitude and phase readings.

3-19. Input Constraints

Details maximum input levels and potential instrument damage from exceeding limits.

3-37. Analog Outputs

Description of analog output connectors providing dc voltage proportional to meter readings.

3-42. Instrument Turn On

Step-by-step procedure for safely turning on the instrument.

3-44. Log A and Log B Measurements

How to directly measure input signal levels in dBV using Log A or Log B functions.

3-45. Relative Measurements (Log B;A)

Measuring the relative amplitude of two signals in dB using the B/A function.

3-48. Phase Measurements

Procedure for measuring the phase difference between two input signals in degrees.

3-54. Effects of Noise on Phase Readings

How the instrument's phase measuring scheme minimizes noise effects.

3-55. Effects of Source Impedance on Phase Readings

3-59. Using 10:1 Divider Probes

3-75. Local Remote Control

3-76. Remote Control Lines

3-77. BCD Outputs

3-79. External Triggering and Flag Timing Sequence

Section IV Theory of Operation

4-5. Simplified Block Diagram Description

4-8. Functional Description

Detailed functional description of the instrument's internal circuits and operation.

4-9. Input Channels

4-16. Log Amplifier (A3;A4 IC1 Schematic No. 1)

4-19. Synchronous Rectifier and Summing Amplifier (A3;A4 IC4 through IC6 Schematic No. 1)

4-21. Phase Detector (A5 Schematic No. 2)

4-30. Q Phase Detector (Schematic Nos. 2, 3 and 4)

4-37. Phase Control Logic (A11 Schematic No. 3)

4-48. Effects of Harmonic Distortion on Phase

Explanation of how harmonic distortion impacts phase measurement accuracy.

4-57. Function Switching Circuits (A8 Schematic No. 5)

4-66. Output Filter (A9;A10 Schematic No. 6)

4-69. Digital Panel Meter

Description of the digital panel meter's analog-to-digital conversion process.

4-91. Trigger and Hold (Options 002, 003)

4-93. Interface Assembly (A16 B Schematic No. 9)

4-95. BCD Output Circuits

4-97. Controller Section

4-99. Timing Circuits

4-102. Timing Circuits

Section V Maintenance

5-3. Recommended Test Equipment

Lists the recommended test equipment for instrument maintenance and calibration.

5-5. Performance Checks

In-cabinet procedures to verify that the instrument meets performance specifications.

5-9. Panel Meter Accuracy Check

Procedure to verify panel meter accuracy within specified tolerances.

5-11. Amplitude and Phase Accuracy Checks

Checks to verify that the instrument meets amplitude and phase accuracy specifications.

5-13. High Level Accuracy Checks

Verifies accuracy specifications with high input levels (2 V rms).

5-15. Shunt Capacitance Check

Verifies the specified shunt capacitance for both input channels.

5-17. Supplemental Phase Accuracy Check

5-19. Adjustment Procedures

Detailed procedures for adjusting various circuits to ensure proper instrument operation.

5-23. Test Point and Adjustment Location

5-25. +12 V Reference Adjustment

Adjusts the +12 Vdc power supply level, serving as a reference for other supplies.

5-27. Power Supply Voltage Checks

Checks to verify that non-adjustable power supply voltages are within design tolerances.

5-29. Output Filter Zero Adjustments

5-31. Panel Meter Zero Adjustment (Standard & Options)

Zeroes panel meter displays to coincide with analog output readings.

5-33. Phase Detector Zero Adjustment

5-35. Current Source and Current Sink Adjustments

Sets current sources and sinks for proper DC levels at the Phase Detector output.

5-37. Panel Meter;Analog Output Adjustments

5-39. Amplitude Offset Adjustment

5-41. Log Amplifier Adjustments

Sets DC bias, gain, and symmetry for Log Amplifier and Synchronous Rectifier.

5-43. Input Attenuator Adjustments

5-45. High Frequency Phase Adjustments

5-47. High Frequency Log Amplifier Adjustment

5-51. General Servicing Information

Instructions for removing/replacing assemblies, servicing boards, and cleaning.

5-53. Cautions

5-55. Assembly Removal

5-65. Component Replacement

5-67. Servicing Etched Circuit Boards

5-72. Troubleshooting

Information and procedures for isolating instrument malfunctions.

5-74. Guidelines

5-76. Symptoms

How to obtain and record front panel symptoms for effective troubleshooting.

5-78. Troubleshooting Trees

Location and usage of troubleshooting trees for fault isolation guidance.

5-80. Probable Cause.

5-81. Recheck Symptoms.

5-86. Power Supply Troubleshooting

Information on the instrument's power supplies and troubleshooting procedures.

5-89. No Load Checks

5-91. Troubleshooting the +12 V and -12 V Supplies

Procedures for isolating failures in the +12 V and -12 V power supply circuits.

Section VI Replaceable Parts

6-4. Ordering Information

Instructions for obtaining replacement parts, including contact details.