Section Iii Operating Instructions; Turn-On Checkout Procedure - HP 6236A Operating And Service Manual

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SECTION III
OPERATING INSTRUCTIONS
3-1
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"If"
_ - - -........
1
Figure 3-1. Controls and Indicators
TURN-ON CHECKOUT PROCEDURE
a. Connect line cord to power source and turn LINE
switch
G)
on. LINE ON indicator
®
will light.
b. Set METER switch
®
to the +6V position and, with
no load connected, vary +6V VOLTAGE-control
@
over
its range and check that the voltmeter responds to the con-
trol setting and the ammeter indicates zero.
c. Set the +6V VO LT AG E control for a 6-volt meter
indication and short the +6V output terminal to COM
(common) terminal
®
with an insulated test lead. The
ammeter should indicate a short-circuit output current of
approximately 1.0A (1.1A in the 6237A). Remove the
short from the output terminals.
d. Set the METER switch to the +20V position and,
with no load connected, vary ±20V VOLTAGE control
®
over its range and check that the voltmeter responds to the
control setting and the ammeter indicates zero.
3-2
The following steps describe the use of the Model
6236A or 6237 A front panel controls and indicators illus-
trated in Figure 3-1 and serve as a brief check that the sup-
ply is operational. This checkout procedure or the more
detailed performance test of Paragraph 5-6 should be follow-
ed when the instrument is received and before it is connect-
ed to any load equipment. Proceed to the more detailed
procedures beginning in Paragraph 5-6 if any difficulties
are encountered.
- - CAUTION--
e. Set the ±20V VOLTAGE control for a 20-volt meter
indication and short the +20V output terminal to the com-
mon terminal with an insulated test lead. The ammeter
should indicate a short-circuit output current of O.55A
±5%. Remove the short from the output terminals.
f. Repeat steps (d) and (e), but substitute the -20V
position of the METER switch and the -20V output ter-
minal.
Figure 3-2. Line Voltage Selector (Set for 120 Vac)
Before applying power to the supply, make certain
that its line voltage selector switch
(53)
is set for
the line voltage to be used. This switch is mounted
on the circuit board behind the voltmeter and is
visible through the perforations in the top cover.
The positions of the two white marks on the switch
indicate the switch setting (see Figure
3-2).
If
the
switch setting does not correspond to the intended
power source, proceed to Paragraph
3-4
before
applying power.
.r--
240----,
( r-
220 ----,
0 _
0
L-,OO--.J
'---120 - - - J
t
FRONT
OF
SUPPLY
NOTE
For the Model 6237A, substitute. +18V
for +6V in the following steps.
3-1
3-3
If this brief checkout procedure or later use of the
supply reveals a possible malfunction, see Section V of this
manual for detailed test, troubleshooting, and adjustment
procedures.

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