Agilent Technologies 4284A Service Manual page 114

These troubleshooting aids provide a list of test points in Table 4-A4-2. T h e A4 high p o w e r
amplifier/DC bias board test point locations are shown in Figure 4-A4-1.
Test Point Signal Name
A4TP1
A4TP2
A4TP3
A4TP4
A4TP5
A4TP6
A4TP7
A4TP8
A4TP9
A4TP10
A4TP11
A4TP12
A4TP13
A4TP14
A4TP15
A4TP16
A4TP17
Table 4-A4-2. A4 Test Points List
AC Voltage signal from the A5 board
Y I N
+8 +8 V DC
GN D Ground Line
Output signal to Hcur Terminal
VOUT
Output signal from the high voltage amplifier
OVLD AC signal overload signal
GN D Ground Line
+50 V DC
+50
-50 V DC
-50
+5V +5 V DC
-8V -8 V DC
H F Buffer output signal (Hi-PW mode: ON)
Output signal from DAC
DAC
V RE F +I- 5 V (the sign depends o n the polarity o f the D C
bias setting)
AC output signal from preamplifier
V DC DC voltage signal (Full Scale: 5 V)
GND Ground Line
4-A4-2
Description