HP 8340B Manual page 289

5-15.
ALC ADJUSTMENTS (Cont'd)
Equipment
Power Supply
.......
Digital Voltmeter (DVM)
1
Megohm
Resistor
...
0.1
UF Capacitor
....
Extender Board
.....
.........
HP 6294A
.........
HP 3456A
. .
HP P/N 0757-0059
...
HP P/N 0160-0168
HP P/N 08350-60031
Procedure
1.
Disconnect AC
power cable from the
DUT
and allow
it
to coot for at least two hours.
2.
Disconnect cables W26 and W27 from A25J2 and A25J1
respectively (Figure 5-46), and remove
the
A25 PC board
from the instrument.
A25
inmminiimnmif
Figure S-46.
ALC Detector A25 Temperature Compensation Adjustments Location
3.
Install an Extender Board
in place
of A25.
4.
Set the DVM for Ohms measurement
and connect the input
between
pins
4
and
26
of the
extender
board. Note the resistance
measured.
This
value
is thermistor resistance,
R-r,
and will be used for
calculations
in
later steps.
5.
Connect the test equipment as shown
in Figure
5-45 with
cable W27 connector connected to an
SMB-to-BNC adapter.
6.
Connect the DVM across
the output terminals of the Power Supply and adjust the power supply
output for 5.00 ±0.01
Vdc. Move
the DVM connections back to the
SMB-to-BNC adapter
as
shown
in
Figure
5-45.
Adjustments
HP 8340B/41B