Hi guys. This is my first post, so I'll try to give as much info as possible, but apologies if I miss something.
I have a question about why resistance may vary on battery negatives (the positive voltage is 120Vdc). All of these negatives are directly electrically connected (jumper wire between terminal terminal strips, as there are a LOT of components involved), but when I test their resistance with all circuits live, I get some rogue resistances.
There are 4 terminal strips that all have negatives connected to them:
I- 1
I- 2
I- 3
I- 4
If I test between 1 and 2, I get about 5 ohms. 1 and 3, about 10. Between 1 and 4, about 15... so you can see the pattern emerging of about 5 ohms per terminal (although I feel that figure in itself may be inconsequential).
HOWEVER, if I electrically isolate all equipment, I get readings of about .2 ohms regardless of which terminals I test between (which is what you would expect).
Could this be my meter (fluke 115) getting thrown by some transient signal when the equipment is live? I tried the meter on both OHMs and 'bell' function, with the same results either way.
Any help would be greatly appreciated.
Thanks
I have a question about why resistance may vary on battery negatives (the positive voltage is 120Vdc). All of these negatives are directly electrically connected (jumper wire between terminal terminal strips, as there are a LOT of components involved), but when I test their resistance with all circuits live, I get some rogue resistances.
There are 4 terminal strips that all have negatives connected to them:
I- 1
I- 2
I- 3
I- 4
If I test between 1 and 2, I get about 5 ohms. 1 and 3, about 10. Between 1 and 4, about 15... so you can see the pattern emerging of about 5 ohms per terminal (although I feel that figure in itself may be inconsequential).
HOWEVER, if I electrically isolate all equipment, I get readings of about .2 ohms regardless of which terminals I test between (which is what you would expect).
Could this be my meter (fluke 115) getting thrown by some transient signal when the equipment is live? I tried the meter on both OHMs and 'bell' function, with the same results either way.
Any help would be greatly appreciated.
Thanks