Hp 303L0A Dc Output Voltages - HP 3000 III Series Manual

HP 32421A Series III Power Supplies
the voltage checks as follows:
a. Stop the computer program.
b. Measure the six dc voltages listed in table 9-1. These volt-
ages are available for cursory measurement only at test jacks
mounted on the power supply front panel. (See figure 9-1.)
c. Set the oscilloscope for checking ac voltage. On the PCA
cage backplane, check each of the six voltages listed in ta-
ble 9-1 for ripple. For each voltage, the indicated ripple
should be less than that listed. If any voltage is not with-
in specified limits, make the necessary adjustments as de-
scr ibed in paragraphs 9-14 through 9-17.
Table 9-1. HP 303l0A Dc Output Voltages
I--------------'-----I-~----l----,------
1
Voltage
1
Minimum
I
Maximum
I
Ripple Voltage
I Test Point
I
Reading
1
Reading
I
Tolerance
I I I I
I---------I------~
--------...,..---
1-------------------------
1
+20
I
Refer to para 9-16.
1
1 I 1
1----------1----------1-------1----------------
I
+15
1
+14.7
1
+16.5
1
0.4 volt peak-to-peak
I .__-.
-~
I 1_- 1_- - _
1 1 1
I
+5
1
Se t a t +5 • 1 7
1
0 • 3 vol t pea k-t
0-
P ea k
1 I 1
I-~----------I-----I-----I--------------------
I
-5
I
-4.5
I
-5.3
I
0.3 volt peak-to-peak
1 I 1 I
1------
·I_·_-_h__-
-_-I---~----I---_-----~-_----·--_--·-
1
-15
I
-14.7
I
-16.5
1
0.4 volt peak-to-peak
I I I 1
1------_·------1------· -.------.----
1---------------------
1 -20 IRefer to para 9-16.1
I ~ I . . _-- I_~~ -------_.
9-14. HP 30310A Adjustments
Three adjustments should be made to the power supply after it is
installed in the computer. 'l'hese adjustments are accessible
through the top cover of the power supply.
9-15. PREREGULATOR ADJUSTMENT. The +15, +5, -15 volt supply
outputs are controlled by preregulator adjustment resistor AlRl
(+5, +l5V ADJ) on the preregulator control PCA. If one or more
of these voltages are not within tolerance when the voltage check
is made, the preregulator should be adjusted as follows:
9-9