Equipment information:

Wavetek 280 Generator
Manufacturer:
Wavetek
Model: 280
Date:
Category: Measurement instruments
Group: Generator
Description: 20 MHz Synthesized Function Generator
Information:
                                    The Model 288 Signal Generator is a precision source of
sine, triangle, and variable symmetry (ramp and pulse)
waveforms for use in the installation and maintenance of
radio receivers, transmitters, and other electronic equipment.
• Push button control for easy operation.
• Indicator lights give constant equipment status.
• Large, 16 character (fourteen segments/ character),
display for all parameters.
• Programmed interface for remote operation.
• Programmable sine, triangle, square, and dc outputs.
• Variable symmetry provides pulse and ramp waveforms.
• Balanced and unbalanced outputs.
• Built-in calibration and fault analysis programs with
extensive self-adjustment.
• Battery backup for saving system setups.

These manuals are available for the above equipment:

Wavetek -- 280 -- Service and User Manual
File name: Wavetek-6391-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 146
Size: 8.63 Mbytes (9049885 Bytes)
Language: english
Revision: revised
Manual-ID/Number: 1300-00-0561
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: 681c8adab674d5895959cee7c53b1409
ed2kID: 781a6142f7b5bbed633d73bf2fc82307
Downloads: 46 since 17 November 2014
Information:
1.1
INTRODUCTION...............................................................................................................1-1
1.1.1 List of
Abbreviations.....................................................................................................1-1
1.2
OPTIONS..........................................................................................................................1-1
1.3
SPECIFICATIONS.............................................................................................................1-1
1.3.1 Waveforms
(functions)..................................................................................................1-1
1.3.2 Operational
Modes.......................................................................................................1-1
1.3.3 Waveform
Quality.........................................................................................................1-2
1.3.4
Frequency......................................................................................................................1-2
1.3.5 Amplitude
......................................................................................................................1-2
1.3.6
Offset.............................................................................................................................1-2
1.3.7
Outputs..........................................................................................................................1-2
1.3.8
Inputs.............................................................................................................................1-3
1.3.9
Displays.........................................................................................................................1-3
1.3.10 GPIB
Programming.....................................................................................................1-3
1.3.11
General........................................................................................................................1-3
1.4 EQUIPMENT
SUPPLIED..................................................................................................1-3
1.5 EQUIPMENT REQUIRED BUT NOT
SUPPLIED.............................................................1-3
SECTION 2 PREPARATIONS
2.1 RECEIVING AND INSPECTING
SHIPMENTS.................................................................2-1
2.2 RETURNING EQUIPMENT FOR
REPAIR.......................................................................2-1
2.3 INITIAL
CHECKOUT........................................................................................................2-1
2.3.1
Introduction...................................................................................................................2-1
2.3.2 Preparation for
Use.......................................................................................................2-1
2.3.3 Turn-on and Initial Checkout
Procedure.....................................................................2-2
2.3.4 Maintenance Messages and
Errors............................................................................2-3
2.3.5 Performance
Verification..............................................................................................2-3
2.4 PREVENTIVE
MAINTENANCE........................................................................................2-6
2.4.1
General..........................................................................................................................2-6
2.4.2 PM
Procedures.......................................'.r...................................................................2-6
SECTION 3 OPERATION
3.1 USE AND FUNCTION OF EACH
CONTROL.................................................................3-1
3.1.1 Front Panel Controls, Indicators, and
Connectors....................................................3-1
3.1.2 Rear Panel Controls, Indicators, and
Connectors....................................................3-11
3.2..NORMAL
OPERATION...................................................................................................3-12
3.2.1
Start-Up........................................................................................................................3-12
3.2.2 Continuous Wave
(CW)..............................................................................................3-12
3.2.3 Sweep
Modulation.......................................................................................................3-13
3.2.4 Amplitude Modulation
(AM)........................................................................................3-14
3.2.5 Frequency Modulation
(FM).......................................................................................3-15
3.2.6 Voltage Controlled Frequency
(VCF).........................................................................3-17
3.2.7 GPIB (Remote)
Operation...........................................................................................3-19
3.3 GPIB COMMAND STRUCTURE
....................................................................................3-20
3.3.1
Introduction.................................................................................................................
3-20
3.3.2 Model 288
Commands.............................................................................................
3-20
3.3.2.1 Command
Types.....................................................................................................
3-21
3.3.2.2 288 Command
Syntax............................................................................................
3-22
3.3.2..3 288 Command
List.................................................................................................
3-23
3.3.3 Universal and Addressed
Commands......................................................................3-26
3.3.4 Detailed Command
Descriptions..............................................................................3-26
3.3.5 Service
Requests.........................................................................................................3-28
3.3.6 Displaying
Messages..................................................................................................3-29
3.3.7 GPIB
Keys....................................................................................................................3-30
SECTION 4 CIRCUIT DESCRIPTION
4.1 THE MODEL 288
..........................................................................................................
4-1
4.2 DETAILED CIRCUIT
DESCRIPTION...........................................................................
4-2
4.2.1 Motherboard
Assembly............................................................................................
4-2
4.2.1.1 Microprocessor
Circuit..........................................................................................
4-2
4.2.1.2 GPIB Interface
Circuit............................................................................................
4-2
4.2.1.3 Frequency Synthesizer
Circuit..............................................................................■
4-3
4.2.1.4 Internal Calibration Network
Circuit......................................................................
4-3
4.2.1.5 DAC/Sample and Hold Network
Circuit...............................................................
4-3
4.2.1.6 Secondary Input/Output Network
Circuit.............................................................
4-3
4.2.1.7 Relay Driver Network
Circuit..................................................................................
4-4
4.2.1.8 Balanced Output Attenuator Network and Impedance
Control Circuit............ 4-4
4.2.1.9 Unbalanced Output Attenuator Network and Impedance
Control Circuit........ 4-4
4.2.1.10 Power Supplies
Circuit........................................................................................
4-4
4.2.2 Front
Panel..................................................................................................................
4-4
4.2.2.1 Control
Knob...............................................................................................................4-4
4.2.2.2
Display........................................................................................................................4-4
4.2.2.3 Keyboard
Circuit........................................................................................................4-5
4.2.2.4 LED
Circuit...................................................................................................................4-5
4.2.3 Function
Generator........................................................................................................4-5
4.2.3.1 VCG Summing
Amplifier........................................................................................
4-5
4.2.3.2 Sweep
Generator....................................................................................................
4-5 .
4.2.3.3 Symmetry
Control...................................................................................................
4-6
4.2.3.4 VCG Current
Sources............................................................................................
4-6
4.2.3.5 High Frequency
Compensation............................................................................
4-6
4.2.3.6
Comparator..............................................................................................................
4-6
4.2.3.7 Frequency Range
Switches...................................................................................
4-7
4.2.3.8 Capacitance
Multiplier...........................................................................................
4-7
4.2.3.9 Triangle
Buffer........................................................................................................
4-7
4.2.3.10 Auto
Calibration....................................................................................................
4-7
4.2.4 Phase Lock Loop
Assembly.....................................................................................
4-7
4.2.4.1 Phase Lock
Loop........................................................................................................4-7
4.2.4.2 Sine
Convertor............................................................................................................4-8
4.2.4.3 Amplitude
Modulator..................................................................................................4-9
4.2.5 Output
Assembly..........................................................................................................4-9
4.2.5.1 Function
Selector........................................................................................................4-9
4.2.5.2
Preamplifier...............................................................................................................
4-9
4.2.5.3 R-R2
Ladder.............................................................................................................
4-9
4.2.5.4 Power
Amplifier.........................................................................................................
4-9
4.2.5.5 -20dB
Attenuator.......................................................................................................
4-10
4.2.5.6 Unbalanced and Balanced
Drivers........................................................................
4-10
4.2.5.6 Peak
Detector............................................................................................................
4-10
4.2.6..Rear
Panel....................................................................................................................
4-10
SECTION 5 CALIBRATION PROCEDURE
5.1
CALIBRATION.................................................................................................................
5-1
5.1.1 Auto
Cal.........................................................................................................................
5-1
5.1.2
Calibrate.......................................................................................................................
5-1
5.2.AUTO CAL
PROCEDURE...............................................................................................
5-1
5.3 CALIBRATE
PROCEDURE............................................................................................
5-1
SECTION 6 TROUBLESHOOTING
6.1
INTRODUCTION.............................................................................................................
6-1
6.2 FACTORY
REPAIR..........................................................................................................
6-1
6.3 BEFORE STARTING
.....................................................................................................
6-1
6.3.1
Inspection.....................................................................................................................
6-1
6.4
TROUBLESHOOTING....................................................................................................
6-1
SECTION 7 PARTS LISTS AND SCHEMATICS
7.1..DRAWINGS......................................................................................................................
7-1
7.1.1 Assembly
Drawings.....................................................................................................
7-1
7.1.2
Schematics..................................................................................................................
7-1
?.1.3 Parts
Lists.....................................................................................................................
7-1
7.2..ADDENDA.......................................................................................................................
7-1
7.3 ORDERING
PARTS........................................................................................................
7-1
APPENDIX A. PERFORMANCE VERIFICATION FORM
.....................................................................
A-1
Wavetek-6391-Manual-Page-1-Picture
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