HP 54620A - To Adjust the Power Supply; Table 9. Equipment Required (Adjusting Power Supply)

To adjust the power supply
WARNING
The maintenance described in this section is performed with power supplied
to the logic analyzer and with the protective covers removed. Only trained
service personnel who are aware of the hazards involved should perform the
maintenance. Whenever possible, perform the procedures with the power
cord removed from the logic analyzer. Read the safety summary at the back
of this book before proceeding.
On the power supply there is only one adjustment, which is for the
+
5.1 V
supply. The other voltages are based on the
+
5.1 V adjustment. In this
procedure you use a multimeter to measure the
+
5.1 V, and, if necessary,
adjust the supply to within tolerance.
Table 9
Equipment Required
Equipment Critical specifications Recommended Model/Part
Digital multimeter 0.1 mV resolution, accuracy
±
0.05%
HP 34401A
1
Set up the logic analyzer for the voltage adjustment.
a
Turn off the logic analyzer.
b
Remove the cover from the logic analyzer.
See chapter 6, “Replaceable Parts,” for disassembly procedures.
c
Place the logic analyzer on its side.
d
Connect the negative lead of the digital multimeter to a ground point
on the logic analyzer.
e
Turn on the logic analyzer.
Testing, Adjusting, and Troubleshooting the Analyzer
To adjust the power supply
160