HP 3468A Operator's Manual

Also see for 3468A: Operating manual

RANGING (Cont’d)AutorangeAutorangingonthe3468Aisdonebytakingreadingsinternallyinthe41/2digitmode.Measurementsaremadeonsuccessiverangesuntiloneisfoundwherethereadingisbetweenfullscale(301000counts)andapproximately9%offullscale{027000counts).Ay CommandRA Selects autorange modeAutorange HysteresisIntheautorange mode,themultimeterwillup range(gotoahigher range)ifthedisplayreadingexceeds(+)301000countsoritwilldownrange(gotothenextlowerrange)ifthedisplayreadingdecreases below(+)027000counts.Thisassumesa51/2digitmode. Thesenumericalautorangepointsareirrespectiveofdecimalpointplacement. ThedifferencebetweenthetwopointsiscalledtheautorangehysteresisandisillustratedinFigure2-2forDCVolts.Autoranginginotherfunctionsissimilar.3oov} i { LaatSON i je P50!RANGE 3v: : ow!S00mV beayep i i30mv } : ; i |ee a ne eeS&S = @ m 8 82eo 6 =m 38s= 8 25INPUT LEVEL= DOWRANGE POINT> 2 UpRANGE POINT sa7en-2-2Figure 2-2. Autorange Hysteresis[2] [2]The3468Aisputinthemanualrangemodeinoneofthreeways:pressingtheAUTO/MAN(Autorange/Manualrange) key,whichwillcausethemetertomaintainitspresentrange; theUP-ARROWkey,whichwillcausethemetertogotothenext higher range;ortheDOWN-ARROWkeytogotoalowerrange.Inany case,whenthe3468Ais inthemanualrangemode,theM RNGannunciatorisoninthe display.Pressing theAUTO/MANkey restores autoranging.HP_] |CommandManual RangingBe4£S=see Table 2-4.20