Products > Test Equipment
Keysight Handheld LCR Can't Measure Resistance as well as my Flukes?
Reprobyte:
I have a Keysight U1731C LCR and a few Fluke 80 series 87 and 85, all my Flukes can measure resistors in circuit correctly, but my U1731C is unbelievably far off, like a thousandth of the value or even 1/40Kth of the value or something insane.
Example 39Kohm measuring 34.5Kohm on my Flukes and 1ohm on the Keysight. 680K measures exactly on the Fluke but its 460Ohm on the Keysight.
This is especially on higher wattage resistors 1W 7W 2W
I have some 1/4w resistors that I can test it on and these seem to test ok on both, and I have a 1W 0.33ohm that tests out of circuit.
I am not that well up with the LCR but the difference in behaviour I cant work out, is it the way it measures? AC vs DC and voltage, or is there an issue with the LCR? I would expect to see some what similar results? Anyone who knows what I have done wrong I would appreciate the advice, it just seems weird that the Flukes can all do it.
Thanks
Fungus:
The two meters will use different measurement techniques but the bottom line is that you can't measure resistors in circuit. There can be capacitors and all sorts of other things around.
Martin72:
Hi,
--- Quote ---I am not that well up with the LCR but the difference in behaviour I cant work out, is it the way it measures?
--- End quote ---
Probably yes (without knowing the circuit you´ve measured into), UC1731 measures impedance, only the U1733C have a DCR range, which means it could measure resistance the way your fluke do.
Have you check what the keysight shows when you separate the resistor from the circuit ?
wraper:
LCR meter most likely measures resistances with AC voltage, so capacitors in the circuit can impact measurements which may be fine when measured at DC.
Reprobyte:
Thank you for the knowledge sharing guys, that actually makes a ton of sense. Now I think of it the capacitors didn’t allow the DC test through, but the AC was being eaten up by those capacitors in circuit. I appreciate the help very much.
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