Agilent Technologies 4284A Service Manual page 85

Softkey
f1 :
'Auto' Used to check all groups, and to isolate the faulty board. The checking
order is shown in Figure 3- 1 3 .
f2: Used to check the power supply group, and to isolate the faulty board in
'Power'
the power supply g roup. The items checked in the power supply group
are as follows:
f3:
' Digital' Used to check the digital g roup (A7 , A20 to A50), and to isolate the faulty
board in the digital group. The items checked in the digital g roup are as
follows:
f4: 'Source' Used to check the source group (A4, A5), and to isolate the faulty board i n
the source g roup. The items checked in the source g roup are a s follows:
f5: Used to check the A6 Vector Ratio Detector (VR D) . The items checked in
'VRD'
the VRD are as follows:
f6: 'TRD' Used to check the transducer (TRD), and isolate the faulty board in the
TRD (A2, A3). The items checked in the TRD are as fol lows:
f8:
'Exit' Used to exit this program.
Table 3-1 4. Main Menu Softkeys
Description
•
Cooling fan
•
Output dc voltages on the A 1 board
•
Neon lump on the A 1 3 board
•
Fuses on the A 1 board
•
VOLTAGE SE LECTOR switch and Fuse on the rear panel
•
Power-on self test
•
Each performance test for each d igital interface
•
Test frequency test
•
Signal level/Level mon itor test
•
DC bias level test
•
H pot Buffer (A3)
•
A-D Converter
•
Prosess amp lifier and phase sensitive detector
•
90 0 phase shifter on A2
•
U N BAL detector on A2
•
H pot buffer on A3
•
MODE M/Normalizer on A2
•
Lcur gain amplifier on A3
•
Range resistor/I sense amplifier on A3
•
I-V converter on A3
•
Bias Current Isolation (Active Indactor) on A3
3-42