Section Iii Operating Instructions; Turn-On Checkout Procedure; Line Voltage Option Conversion - HP 6236B Operating And Service Manual

Figure 3-1. Controls and Indicators
3-1

TURN-ON CHECKOUT PROCEDURE

3-2 The following steps describe the use of the Model
6236B or 6237B front panel controls and indicators illus-
trated in Figure 3-1 and serve as a brief check that the sup-
ply is operational. Follow this checkout procedure or the
more detailed performance test of paragraph 5-6 when the
instrument is received and before it is connected to any
load equipment. Proceed to the more detailed procedures
beginning in paragraph 5-6 if any difficulties are
encountered.
———
Before applying power to the supply, make certain
that its line voltage selector switch (S3) 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.
For the Model 6237B, substitute+18V
for +6V in the following steps.
OPERATING INSTRUCTIONS
CAUTION ———
NOTE
SECTION III
a. Connect line cord to power source and turn LINE
switch
b. Set METER switch
no load connected, vary +6V VOLTAGE control
its range and check that the voltmeter responds to the
control setting and the ammeter indicates zero.
c. Set the +6V VOLTAGE control for a 6-volt meter
indication and short the +6V output terminal to COM
(common) terminal
ammeter should indicate a short-circuit output current of
approximately 1.0A (1.1 A in the 6237B). Remove the
short from the output terminals.
d. Set the METER switch to the +20V position and
turn TRACKING RATIO control
FIXED position. With no load connected, vary ±20V VOL-
TAGE control
meter responds to the control setting and the ammeter
indicates zero.
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 0.55A
±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.
g. Adjust the +20V output for a 20V meter indication.
Then set the METER switch to the -20V position and
check the effect of the TRACKING RATIO control on the
voltage of the -20V output. The -20V output should be
adjustable from less than 0.5 volts to a maximum of 18 to
22 volts.
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.
3-4

LINE VOLTAGE OPTION CONVERSION

3-5 To convert the supply from one line voltage option
to another, the following three steps are necessary:
3-1
on. LINE ON indicator
to the +6V position and, with
with an insulated test lead. The
fully clockwise to the
over its range and check that the volt-
will light.
over