HP 8568B, Performance Tests And Adjustments Manual, Page: 141 / 313

1. Low-Voltage Power Supply Adjustments
7. Verify that the + 120 V indicator (yellow LED) is lit.
Note
On IF-Display Sections serial prefixed and below, indicator
is a + 100 V indicator.
8. Connect the DVM to DVM indication should be + 120.0
V dc. The + 120 V supply is referenced to the + 15 V supply;
therefore, if the + 120 V supply is out of tolerance, a circuit
malfunction is indicated.
Note
On IF-Display Sections serial prefixed and below, the DVM
indication should be + 100.0 V
9. Verify that the V indicator (yellow LED) is lit.
10. Connect the DVM to DVM indication should be
V dc. The V supply is referenced to the + 15 V
supply; therefore, if
the
V supply is out of tolerance, a
circuit malfunction is indicated.
RF Section
11. The indicator (yellow LED) should be lit. See
Figure 3-4.
V O L T A G E
R E G U L A T O R
A D J
\
A D J
Figure 3-4. Location of RF Section Low-Voltage Adjustments
12. Connect the DVM to with the ground lead to
Adjust ADJ for a DVM indication of
V dc.
13. The + indicator (yellow LED) should be lit.
14. Connect the DVM to The DVM indication should be
+ 15.000 V dc. The + supply is referenced to the
supply, therefore, if the + supply is out of tolerance, a
circuit malfunction is indicated.
15. The indicator (yellow LED) should be lit.
16. Connect the DVM to The DVM indication should be
V dc. The supply is referenced to the
Adjustments