ST4073
ScientechTechnologies Pvt.Ltd.10
FunctionalChecks
The 30V-2APower Supply shouldregularlybetestedtoassureproperfunctioning.
Thefollowingtestchecksoutthepowersuppliesperformance andsuggestionsfor
adjustingspecificvalues.Theadjustmentwill onlybemeaningfulifthebelow
indicatedorequivalentinstrumentsareused.Priortothefunctionaltestoradjustment,
theinstrumentshouldbeonforatleast30minutes.
MeasuringInstrumentsrequired:
1. 4½DigitDMM;4011 Handheldorequivalent
2. 20MHzOscilloscope;Caddo802orequivalent
3. Rheostat:100 Ω-2A; 17 Ω-5.5A
TestProcedure:
0-30VDCoutput
1. CheckofmaximumDCoutputvoltage: SettheCoarseandFineknobsto
maximum,themaximumDCoutputreadingshouldbebetween31Vand33 V.
ThisalsocanbeverifiedonDMM.
2. Checkofminimum DCoutputvoltage: SettheCoarseandFineknobsto
minimum,theminimumDCoutputreading shouldbe00.0Volts,whichwhen
measuredonDMMwill beapproximately25mVforloadresistorof<5KΩ.
3. Checkofminimum currentlimitsetting: SetDCoutputto10V&shortcircuit
theoutputterminals.Adjustcurrentlimitknob Imaxtominimumthereadingon
thedisplayshouldbe<100mA.
4. Checkofmaximum.Outputcurrent: SettheDCoutputvoltageto10V.Short-
circuittheoutputterminals.AdjusttheImaxcurrentlimit knobtomaximum,the
reading onthedisplay,shouldbebetween2.02Aand2.2A.
5. Checkofover loadIndicators: Settheinstrumentasin3.Whentheoutput
terminalsareshortcircuited,CC LEDshouldlightup.
6. Checkofresidualrippleand noise: ConnectanyloadonDCoutputandadjust
theImax,tomaximum(maximumto2000mA), andchecktherippleandnoiseon
oscilloscope,therippleandnoiseshouldnotbemorethan1mVrms.
