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Old 09-24-2012, 09:24 PM   #1
Amarbir
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Default Help - Calibrating a Sears Analog VOM [ 9 460.5205 ]

Hello All ,
I Am Restoring And Trying to calibrate This Multimeter Today ,Have 2 Units Hence Made My work a little easy + the schematics were there too .Please Have a look At this VOM

The Sears 460.5205 41 Ranges VOM






The Inside Of This VOM




The Calibration Pots Inside





The Schematic Of The Same



Link To Larger Image - > http://i49.tinypic.com/rwt109.jpg


What i Would Like To Do is that i would like to calibrate the same ,But i am very confused ,For DC Volts I Have No Idea if VR2 is required to be tweaked or VR3 .For DC Amperes i Think Its The Calibration Resistor R9 Currently At 33.16 .VR5 is the Resistance Zeroing .Would Like To Know What Pot To Touch If i Need To Calibrate The Same .No Idea What VR1 And VR4 Would Be Doing .I Will Also Upload A Chart Of Identifying Components So That Future People Could Refer To This Thread .Meter is 18 Micro Amperes FSD .

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