Voltage Divider (current not stable)
Voltage Divider (current not stable)
(OP)
Hello! I recently built a voltage divider, and tested out resistors before soldering, which were in good condition. However, when I connect my divider to the HV supply my current seems to be unstable.
The current should read 210microA, but it keeps fluctuating between 218-219 even after 10 minutes of voltage running through it. I have re-tested the resistors still connected to the board with the use of a multimeter and they all still give me their correct value. I even added extra solder support to the resistors thinking that one might be lose but I have had no luck in stabilizing it.
Any suggestions?
I would greatly appreciate it,
mavila2012
The current should read 210microA, but it keeps fluctuating between 218-219 even after 10 minutes of voltage running through it. I have re-tested the resistors still connected to the board with the use of a multimeter and they all still give me their correct value. I even added extra solder support to the resistors thinking that one might be lose but I have had no luck in stabilizing it.
Any suggestions?
I would greatly appreciate it,
mavila2012





RE: Voltage Divider (current not stable)
RE: Voltage Divider (current not stable)
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Voltage Divider (current not stable)
What kind of construction are the resistors? I.e. carbon, metal film? Metal film and similar resistors have a lower temperature coefficient, and would be less susceptible to thermal fluctuations - which begs the next question, are the resistors exposed to air currents?
RE: Voltage Divider (current not stable)
RE: Voltage Divider (current not stable)
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Voltage Divider (current not stable)
Based on some assumptions about the sort of DVOM that you're using, this is likely all perfectly normal.
The offset is probably within tolerance, including both source errors and instrument errors (both % and count).
Also, the "fluctuation" in the final digit can be as simple as the "count" (within the meter) being +/- 1 (or more).
One doesn't trust digital readouts to clearly communicate fluctuations. One switches to an oscilloscope.
RE: Voltage Divider (current not stable)
So don't worry , you're so close to the readins you need, and its the multimeter tolerance issue
I hope i helped you,regards
RE: Voltage Divider (current not stable)
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Voltage Divider (current not stable)