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Measuring Instruments
438A
HP 438A Service Manual
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MANUAL CHANGES
Note
This manual does not contain any backdating inf
ormation. If
backdating information is
required for operating or repairing your
HP 438A with serial pref
ix 2822A or 2839A
U and belo
w
, you must
purchase manual part number 00438–90015.
7
7-1
174
176
Table of Contents
Acoustic Noise Emissions
3
General Information
7
Introduction
7
Specifications
9
Safety Considerations
9
Instruments
9
Manual Changes Supplement
9
Description
10
Options
10
Electrical Options
10
Mechanical Option
10
Accessories Supplied
11
Accessories Available
11
Rack Mounting Kits
11
Cables
11
Recommended Test Equipment
12
Supplemental Characteristics
15
Additional Supplemental Characteristics
16
Installation
19
Initial Inspection
19
Warning
19
Preparation for Use
20
Power Requirements
20
Installation Checklist
20
Line Voltage and Fuse Selection
21
Selection of Operating Voltage
21
Power Cable
22
Power Cable and Line Plug Part Numbers
23
HP-IB Address Selection and Configuring
24
Allowable HP-IB Address
25
Interconnections
26
Mating Connectors
26
Operating Environment
26
Bench Operation
26
Logic Levels
27
Mating Connector
27
Mating Cables Available
27
Cabling Restrictions
27
Storage and Shipment
28
Rack Mounting
28
Environment
28
Packaging
29
Tagging for Service
29
Original Packaging
29
Other Packaging
29
Operation
31
Operating Characteristics
31
Local Operation
31
Initial Turn-On Information
31
Remote Operation HP-IB
32
Operator's Maintenance
32
Major Operating Characteristics
33
Simplified Front Panel Features
35
Rear Panel Features
36
Preset
37
Calibration
37
Measurement Modes
37
Sensor
37
Measurement Parameters
38
Set a and Set B
38
Cal Factor
38
Filter
38
Measurement Units
39
Store and Recall
39
Range
39
Offset
39
Turn on Instructions
40
Turn on
40
Error Messages
41
Power Reference and Calibration
41
Operator's Checks
42
Basic Functional Checks
42
HP-IB Functional Checks
42
Equipment
43
Front Panel Checks Setup
44
HP-IB Checks
46
Initial Setup
47
Remote and Local Messages and LCL
47
Sending the Data Message
48
Receiving the Data Message
49
Local Lockout and Clear Lockout
49
Clear Message
50
Abort Message
51
Status Byte Message
51
Require Service Message
52
Status Bit Message
53
Trigger Message
54
Message Reference Table
55
Remote Operation
58
Remote Mode
58
Remote Capability
58
Local to Remote Changes
58
Local Mode
59
Addressing
59
Local Lockout
59
Turn on Default Conditions
60
Data Messages
60
Turning off Functions
61
Hold Range
61
Hold Filter
62
Limits
62
Display Functions
62
Display Enable
62
Triggering Measurements with the Data Message
63
Hold
63
Trigger Immediate
63
Trigger with Delay
63
Free Run
64
Program Order Considerations
64
Data Output Format
65
Receiving the Clear Message
70
Receiving the Trigger Message
70
Status Message Output Format
70
Codes Used in Status Message
71
Response to a Clear Message
72
Response to a Trigger Message
72
Receiving the Remote Message
73
Receiving the Local Message
73
Receiving the Local Lockout Message
73
Receiving the Clear Lockout
73
Sending the Require Service Message
74
Service Request Mask
74
Measurement Error
74
Sending the Status Byte Message
75
Sending the Status Bit Message
75
Receiving the Abort Message
76
HP-IB Syntax and Characteristics Summary
76
Status Byte
77
HP-IB Codes to Parameter Summary
77
Cal Adj
78
Program Codes
79
Indications
79
Comments
79
Related Section
80
Dbm/Watt
83
Measurement Errors
87
Entry Errors
89
Filters
90
Auto Filter Setting for each Range
90
Performance Tests
119
Equipment Required
119
Performance Test Record
119
Calibration Cycle
120
Abbreviated Performance Test
120
Test Procedure
120
Zero Carryover
121
Test
121
Zero Carryover Test Setup
121
Instrument Accuracy Test
123
Instrument Accuracy Test Setup
123
Power Reference Level Test
126
Adjustments
131
Factory Selected Components
131
Interrelated Adjustments
132
Post-Repair Adjustments
132
Analog to Digital Converter Slope Adjustment
135
220 Hz Frequency Adjustment
137
Replaceable Parts
145
Abbreviations
145
Factory Sealed Parts
146
Parts List Backdating
146
Parts List Updating
146
Reference Designations
148
Front Panel
171
Rear Panel
172
Cabinet Parts
173
Code List of Manufacturers
174
Manual Changes
175
Service
177
Service Sheets
177
Block Diagrams
177
Schematic Diagrams
177
Service Tools
178
Assembly Locations
179
Parts and Cable Locations
179
Heat Staking Tool
179
Test Point and Adjustment Locations
179
Service Aids on Printed Circuit Baords
180
Other Service Documents
180
Etched Circuit Soldering Equipment
180
Troubleshooting
181
Service Related Error Message
181
After Service Safety Checks
181
Schematic Diagram Notes
182
Overall Block Diagram
190
Principles of Operation
190
General
190
Power Meter Simplified Overall Diagram
190
Controller Section
191
Interrupt Control Routine Flowchart
192
Task 1 Flowchart
193
Power Supply Section
196
Troubleshooting Hints
197
Simplified Power Supply Grounding
197
Power Meter Service Position
198
Abnormal Indications
199
Display Enable Waveform
200
Power Displayed for 1 Mw Power Reference
201
Memory Check
210
Data Bus Test Pattern
210
Signature Analysis Check
211
Signature Multimeter Control Settings
211
Amplifier Section
215
Amplifier, Detector, Filter and Comparator Circuits
218
1 Mw 50 Mhz Power Reference Circuit
220
Digital Filter Software Routine
220
Power Sensor to First Amplifier Interface Check
221
Phase Detector Drive
222
Central Processing Unit Troubleshooting
224
Extended Test Mode
224
Extended Test Mode Error Messages
225
Commands in Extended Test Mode
226
Signature Analysis Mode Checks
227
Free Run Signature Analysis
227
Memory Data Bus Buffer Signatures
228
Chip Select Signatures
229
Address Bus Signatures
233
Reset/Power Fail Test Voltage Checks
233
Free Run Mode Troubleshooting
234
Data Line Logic Levels
234
Data Bus Tests
235
Microprocessor Data Bus Buffer Check
235
Microprocessor Data Bus Buffer Signatures
236
I/O Data Bus Check
238
I/O Data Bus Buffer Signatures
239
I/O and Display Address Decode Signatures
240
Miscellaneous Checks
244
Keyboard Priority Encoder
244
Addressable Display Latch
244
Signature Analysis Mode Troubleshooting
245
Keyboard Assembly Component Locations
245
A3 Assembly
247
Display Assembly Troubleshooting
253
Fault Isolation Procedure
253
Anode Data Display Drivers Voltage Levels
254
Input Amplifier Circuit Troubleshooting
258
Selected Amplifier AC Signal
259
Amplifier Test
260
220 Hz Buffer Test
261
220 Hz Multivibrator Test
261
Channel Selection Circuitry Test
262
Multivibrator Waveforms
262
Decoupled Power Supply Test
263
P/O Main Amplifier Assembly Troubleshooting
265
Power Supply Checks
265
Problem Isolation Using Signature Analysis
265
Digital I/O Test
266
Digital I/O Signatures
267
Auto Zero DAC and Buffer Test
268
Zero BAC Buffer Signatures
269
Offset DAC Buffer Signatures
270
Offset Removal DAC Test Signal
270
Gain DAC, Buffer and Gain Compensation Test
271
Recorder Output Test Signal
271
Gain DAC Buffer Signatures
272
Miscellaneous Buffer Test
272
Stable Current Source
273
Cal Oscillator Control Test
273
Miscellaneous Buffer Signatures
273
Ramp End Waveform
277
Analog to Digital Converter Ramp Waveform
277
Variable Gain Amplifier Waveform
278
AC Gain Stage Waveform
278
Analog to Digital Input Waveform
279
Gain/Attenuator Buffer
279
Gain/Attenuator Buffer Signatures
280
A/D Input Multiplexer Signatures
280
Ramp Start Gate Waveform
281
Range Attenuator
281
Variable Gain Amplifier
282
AC Gain Stage Test
282
Synchronous Phase Detector Test
282
Synchronous Phase Detector Output Waveform
283
Phase Detector Drive Waveforms
283
Phase Detector Control Waveform
285
Low Pass Filters
285
Analog/Digital Input Multiplexer Test
286
Sensor Resistor Selection Test
287
"A" Ground Circuit Test
288
P/O Power Supply Circuits Troubleshooting
291
Fault Isolation
291
+5 Volt Digital Supply Test
291
+5 Volt Display Supply Waveform
292
Total Power Failure Test
293
Rectifier Assembly Component Locations
294
P/O Interconnect Assembly Component Locations
295
Regulator Assembly Component Locations
297
Power Reference Oscillator Circuit Troubleshooting
302
50 Mhz Oscillator
302
ALC Loop and Power Supply
302
Internal Top View
305
Internal Bottom View
306
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HP 438A Specifications
General
Brand
HP
Model
438A
Category
Measuring Instruments
Language
English
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