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Figure 5-2. Front Panel Terminal C'j"mectlons
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ment that Includes the resistance <lf the'leads be-'
tween the output terminals and the point of connec-
tion.'
5-lC When me;v;urlng the consta~tvoltage per-:
fonnance specifications, the current controls
should be ·set well above the maximum output cur-.
rent which the supp'ly will draw, since the·onset
of constant current action will cause a drop In out-,
put voltage, Increased ripple, and other perfom-
ance''changes not properly.ascrlbtid to the constant
. voltage ope_ratlon of the supply.' '
5-11 Output Voltage and Voltmeter Accuracy.
Proceed as follows:
·
a.. Connect load rest'stance across rear out-
put, terminals of suppi,y; (Figure' 5-3 shows values
of load resistor used throughout·the performance
tests.)
.
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b.'
Connect differential voltmeter across
+s:
and
-s
terminals of supply observing C!)rrect polar-
,lty.
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.. c. Tum on supply and adjust VOLTAGE con-
trols until front panel voltmeter Indicates exactly
the maximum rated output voltage.
· d. Differential voltmeter should 'read 600
±12Vdc.
, 5-12 Load Regulation. .
•
· Definition: The change LIEouT In the
, static value of DC output voltage re-
sulting from a change In load resist-
ance from open circuit to
a
value
which yields maximum rated output
current, (or v,lce versa). · ,
5-13
Uory,
5-3.
To check the Constant-Voltage load regula-
proceed as follows:
a. Connect test setup as shown In Figure
b. Tum CURRENT controls fully clockwise.
. c. Tum-on supply and adjust VOLTAGE con-
trols until front panel voltmeter Indicates exactly
the maximum rated output .voltage.
J
Figure 5-3. Coi;istant Voltage Test S~tup
ferentlal voltmeter •
e. Disconnect load resistors.
f. •Reading on differential voltmeter should.
,, /lot vary from reading 1ecorded In, step d by more
than 600mV.
5-14 Line Regulation.
Definition: The change, t.Eou'r In the
static value of DC output: voltage re-
sulting from
a
cliange In AC Input volt-
age over the' sp~clfled rang<i from low
line 10% less than nominal to high line
10% more than nomina( or from high line
to low line.
5-15 To test the Constant Voltage line regulation,
proceed as follows:
'
a. Connect variable iluto transformer-be-
tween Input power source and power, supply power
' Input.
b' Tum CURRENT controls fully clockwise.
c. Connect test setup shown In Figure' 5-3.
d. Adjust variable auto transformer for low
line (103.'5Vac).
·
·
·
e. Tum on •supply and adjust VOLTAGE con·
trols until front panel voltmeter Indicates exactly
the maximum rated output voltage. ·
f.
Read and record voltage Indicated on
differential voltmeter.
g. Adjust variable auto transformer for hlgh
line (126. 5Vac).
,
h. · Reading on differential voltmeter should
not vary from reading recorded in step g by more
than 600mV.
·
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d. Read and record vol.tage indicated on dlf-'.,
5-3
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,11
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