Hi Group, can someone help please.? my craftsman digital multimeter 82344 n ot reading correctly, when i select the ohms or diode position to test com ponents the display reads .844 on the ohms position and .556 on the diode p osition, it is stuck on those values, does not change. i did change the fus e, still the same.. it does read voltage and continuity.
DMM stuck on .844 ohms
Apr 29, 2021
5 Replies
Can you get to the switch? Something may have fouled the Ohms Setting.
Peter Wieck Melrose Park, PA
yes, the switch/selector isn't stuck. the ohms display is , i might have accidently tested a high voltage in the ohms setting, i don't remember. just wanted to know if it's fixable. i google it, and found zilch...
How is it reading in the Volts ranges? These things have only one A/D converter and display. Everything else is input conditioning, range selection and (for ohms) a current source.
Paul Hovnanian mailto:Paul@Hovnanian.com
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I live the way I type; fast, with a lot of mistakes.
Paul Hovnanian P.E. wrote: ====================
** Hand held DMMs do not use current sources for resistance measurement.Rather, they read the *ratio* of two voltages, one across the unknown part and the other across an accurate reference resistor. This is both simpler & far more accurate.
Also, they do not use normal A-D converters.
An analogue technique called " dual slope integration" converts the DC input voltage to a precise time interval. This interval is used to pass clock cycles from a time base which counted and displayed in decimal form.
The "digital " bit is only the display.
..... Phil
no problems in the volts range.
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