If you are feeding 3V into a 10M resistor, where are the other 380 mV being dropped? Is that voltage lost in the wires from the power supply to the PCB? That seems like a lot of voltage drop if there is just a 10M ohm resistor on the PCB
If it was a short from Vcc to ground, then voltage on the PCB should be very close to 0.0 volts.
Often you need to physically cut DC supply lines to isolate circuits
If it was a short from Vcc to ground, then voltage on the PCB should be very close to 0.0 volts
low resistance where you expect to find high resistance
If i put my DVM meter across a resistor lets say 100K or 1meg, it's going to measure 100K or 1meg , why would it read a lower resistance if there is a short?
If you measure a resistor in circuit you will generally read a lower value than the resistor because not all the current from the probes goes through the resistor. Some part (maybe almost all of it if there's a short) will take another path,
If i put my DVM meter across a resistor lets say 100K or 1meg, it's going to measure 100K or 1meg , why would it read a lower resistance if there is a short?
The way the electronic tech. at my work finds shorts is putting the DVM meter across a Resistor and measuring the voltage across the resistor, then you convert the voltage drop to current. Then you measure another resistors voltage drop that's in the signal path and you keep measuring the voltage drops and convert it to current until you find a high current?
I just don't know, how a tech would know which resistors voltage drop and converting it to current would tell you there is a short? because it would depend on the resistors value, so a 1meg would give you a big voltage drop so the current would be high but that doesn't mean there is a short there cause that is normal
I'm just confused on how you would know which voltage drop in relationship with the resistors value a tech would know that the current is a short?
some voltages are too low, current is zero through some resistors.
The Tech at my work showed me kinda of something to find shorts, If there is a short in a circuit somewhere, You use the ohm meter can what ever component has a resistance that measures a SHORT on the meter then you have located your shorted network??
Cause he was using the Ohm meter measuring the resistance component to component either if its a capacitor or transistor or resistor still using the ohm meter to measure the "resistance of the component" from stage to stage and then he found a stage that made he meter SHORT, so he isolated the network
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