Agilent Technologies 4284A Service Manual page 106

These troubleshooting aids provide a list of jumpers and test points. T h e jumpers are listed
in Table 4-A2-2, and the test points are listed in Table 4-A2-3. T h e test point locations are
shown in Figure 4-A2-1.
Reference
Description
Designator
A2J4 0° Integrator Output
Selection
A2J5 90° Integrator Output
Selection
A2J201 Zero Offset Adjustments
A2J202
Jumpers
A2J203
A2J301
A2J302
A2J303
Test Point Signal Name
A2TP1
A2TP2
A2T P3
A2TP4
A2TP5
A2TP6
A2TP7
A2TP8
A2TP9
A2TP10
A2TP11
A2TP12
A2TP13
A2TP14 NULLOUT
Table 4-A2-2. Jumper List
Table 4-A2-3. A2 Test Points
GND
UN BA L
X30
GND
NULL
-8
+8
ODEG
90DEG
-12
GND
MOD
GND
4-A2-2
Use
Normal Position:
Connects t h e 0 ° integrator o u t p u t
signal to the modulator.
Test Position:
Connects -8 V DC to the modulator.
Normal Position:
Connects t h e 9 0 ° integrator output
signal to the modulator.
Test Position:
Connects -8 V DC to the modulator.
These jumpers are used for
Adjustments.
(Refer to SECTION 2.)
Description
Ground Line
UNBALANCE Detector Signal
Signal multiplied I -V converter o u t p u t
signal by 30
Ground Line
Null Detector Signal
-8 V DC
+8 V DC
0° reference signal
90° reference signal
-12 V DC
Ground Line
Modulator Output Signal
Ground Line
Normalized Output Signal from the sum-
ming amplifier