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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
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