Sometimes, in the course of repairing small portable radios, etc, I perform voltage checks and compare to the values specified in service manuals.
On more than 1 occassion, I observed negative values. Typically, this is seen on transistors. Since ground probe is at ground (-), and these are DC powered devices, I don't understand how the readings can be negative.
For example, specs say voltages for B of Q1 should be 0.00. However, I might read -0.6v.
So asking if someone can explain to me the reason for this. Meter is good, its' a fluke 177 and I have obtained the same readings using my fluke 189-II as well so it's not something to do with the meter.
Thanks for any response or advice.
On more than 1 occassion, I observed negative values. Typically, this is seen on transistors. Since ground probe is at ground (-), and these are DC powered devices, I don't understand how the readings can be negative.
For example, specs say voltages for B of Q1 should be 0.00. However, I might read -0.6v.
So asking if someone can explain to me the reason for this. Meter is good, its' a fluke 177 and I have obtained the same readings using my fluke 189-II as well so it's not something to do with the meter.
Thanks for any response or advice.