| Electronics > Repair |
| UT61E DC voltage measurements problem |
| (1/1) |
| Buhefade:
Hello I tried to dig through Ut61e posts but I wasn't able to find similar problem -On DC voltage (both auto/manual) display can't be zeroed even when probes shorted (shows small negative voltage) -gives different results when probes switched. Example: read out +4.5V - > switch probes and same potential read out - 2.4v. -measurements are not sonsistent in overall. Tried: Board nad main switch cleaned VR1 replaced Corrected soldering around main IC |
| Mickle T.:
If there is no contamination on the printed circuit board and on the switch lamellas, then I see only two reasons for the zero shift of the multimeter: failure of the auto-zero correction capacitor C6 470nF (pin 14) or breakdown of the input circuits of the ADC U1 ES51922. |
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