Dc Output Voltages - HP 3000 III Series Manual

HP 32421A Series III Power Supplies
I
CAUTION
I
When cables are connected to or disconnected
from the power supply, the corresponding
UPPER or LOWER MEMORY DC POWER switch on the
System Dc Control Panel must be placed in
STANDBY and the corresponding HP 30311A pow-
er switch must be in the off (down) position
to pre vent equipment damage.
9-21. Preventive Maintenance
Preventive maintenance is performed at monthly or bi-monthly in-
tervals depending on the physical environment prevailing at the
site. Preventive maintenance consists of measuring the dc volt-
ages at the test jacks on the power supply front panel and per-
forming the battery test procedure.
9-22. VOLTAGE CHECKS. Measure the five vol tages listed in table
9-3 using a digital voltmeter. Allow the recommended warm-up
period for the voltmeter before taking any measurements. If any
voltage is out of tolerance, make the necessary adjustments as
described in paragraphs 9-24 through 9-27.
Table 9-3. Dc Output Voltages
If all voltages are out of tolerance,
perform the +5.00-volt internal ref-
erence adj us tment first. (Refer to
paragraph 9-27.) Also, the +12.7 test
jack vol tage is equal to wha te ve r
voltge is measured at the +12 test
jack plus 0.7 +/- 0.2 volts.
+5.1 +/- O.lV
+12B + 0.7(+/-0.2)V
+12.0 +/- O.lV
-3.0 +/- 0.25V
-5.0 +/ - O. 2V
Note
+12B
-5B
-3B
+12.7B
+5B
I-'-~-----'-~---'---'--------'-<
I
Voltage
I
I
Test Jac k
I
Indica tion
1_ _- .. 1 .__._._. _
I
I
1
I
I
I
I
I
I
I
I
1------_·_·_--
I
1
I
I
I
I
I
1
I
1
9-15