HP 4280A Service Manual

Model 4280A
LIST OF ILLUSTRATIONS
List of illustrations
Number
4-8.
4-9.
5-l.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
Title Page
HP-IB Interface Test
Setup . . . . . . . . . . . . . . . . . . . . 4-18
Conductance Measurement
Accuracy Confirmation
Check Setup
. . . . . . . . . . . . . . 4-27
Al4 Switching Frequency
Adjustment Setup
. . . . . . . . . 5-6
Reset Circuit Adjustment
Setup
. . . . . . . . . . . . . . . . . . . . 5-7
Al4 +5V Adjustment Setup . . . . . 5-9
A5 +12OV Adjustment
Setup . . . . . . . . . . . . . . . . . . . .
5-10
A4 Oscillator Level
Adjustment Setup . . . . . . . . .
5-11
A8 Integrator Offset
Adjustment Setup . . . . . . . . .
5-12
Waveform at A8TP4 (SLOPE
AMP OUT) . . . . . . . . . . . . . . . . .
5-13
A8/A7 Test Signal Phase
Adjustment Setup . . . . . . . . .
5-15
A7 Tracking Adjustment
Setup
. . . . . . . . . . . . . . . . . . . . 5-17
A8 90" Phase Adjustment
Setup
. . . . . . . . . . . . . . . . . . . . 5-19
A8 S/H Gate Adjustment
Setup . . . . . . . . . . . . . . . . . . . . 5-21
A2 DC Offset Adjustment
Setup . . . . . . . . . . . . . . . . . . . .
5-23
A6 Loop Phase Adjustment
Setup
. . . . . . . . . . . . . . . . . . . . 5-25
Waveform at A6TPll
. . . . . . . . . . 5-27
A2 Range Resistor
Adjustment Setup
. . . . . . . . . 5-30
A3 26dB L-R Amplifier
Adjustment Setup . . . . . . . . . 5-31
A4 DC Bias Supply
Adjustment Setup . . . . . . . . . 5-33
A10 Analog Output
Adjustment Setup . . . . . . . . . 5-35
Number
8-l.
8-2.
;I;:
8-5.
8-6.
8-7.
8-8.
8-9.
8-10.
8-11.
8-12.
Title Page
4280A Block Diagram . . . . . . . . . 8-2
Basic Connection Modes . . . . . . 8-3
I-V Converter . . . . . . . . . . . . . . . 8-3
Phase Detection Vector
Diagram . . . . . . . . . . . . . . . . . . 8-4
Vector Voltage Ratio
Detection Timing . . . . . . . . . 8-5
Signal Source Block
Diagram . . . . . . . . . . . . . . . . . . 8-6
Connection Mode Switching
Circuit Block Diagram . . . . . 8-7
I-V Converter Block
Diagram . . . . . . . . . . . . . . . . . . 8-8
Vector Representation of
the Vector Modulator
outputs . . . . . . . . . . . . . . . . . . 8-9
Vector Ratio Detector
Block Diagram . . . . . . . . . . . . 8-10
Internal Bias Source
Block Diagram . . . . . . . . . . . . 8-11
Al C Offset Block
Diagram . . . . . . . . . . . . . . . . . . 8-12
vii

HP 4280A Specifications

General

Brand	HP
Model	4280A
Category	Plotter
Language	English