Agilent Technologies 4284A Service Manual page 114

These troubleshooting aids provide a list of test pOints in Table 4-A4-2. The A4 high power
amplifier/DC bias board test point locations are shown in Fig u re 4-A4-1 .
Test Point
A4TP1
A4TP2
A4TP3
A4TP4
A4TP5
A4TP6
A4TP7
A4TP8
A4TP9
A4TP1 0
A4TP1 1
A4TP1 2
A4TP1 3
A4TP1 4
A4TP1 5
A4TP1 6
A4TP1 7
Table 4-A4-2 . A4 Test Points List
Signal Name
AC Voltage sig nal from the A5 board
VIN
+8
+8 V DC
Ground Line
CN !)
Output signal to Hcur Terminal
VOUT
Output signal from the high voltage amplifier
AC signal overload signal
O VLD
Ground Line
CN !)
+50 V DC
+50
- 5 U
-50 V DC
+5 V DC
+5 V
-8V
-8 V DC
HF
Buffer output signal (Hi-PW mode: O N)
DA C
Output signal from DAC
+/- 5 V (the sign depends o n the polarity of the DC
VREF
bias setting)
AC output sig nal from preamplifier
VJ)C
DC voltage signal (Fu ll Scale: 5 V)
Ground Line
CN!)
Description
4-A4-2
�