I just purchased a U1733C LCR meter and for the most part. it works fine. However, I'm questioning the accuracy. It reads OK with electrolytic capacitors up to 1uF but with values higher than that, the accuracy degrades. A 470uF capacitor, for example, will read 445uF. I tested 10 samples and the all read less .5% tolerance of each other. The meter settings are 100Hz, series capacitance and before I make the measurement, I calibrate the meter.
When I measured the same samples with a fluke 189, they all read within 475uF. Even my Fluke 16 and a Korean made CM-108 Protek Capacitance meter measured the samples within 1% of 475uF. According to Keysight's specifications the meter accuracy is .5%.
Do I trust the Fluke measurements or Keysight?
When I measured the same samples with a fluke 189, they all read within 475uF. Even my Fluke 16 and a Korean made CM-108 Protek Capacitance meter measured the samples within 1% of 475uF. According to Keysight's specifications the meter accuracy is .5%.
Do I trust the Fluke measurements or Keysight?
When I measured the same samples with a fluke 189, they all read within 475uF. Even my Fluke 16 and a Korean made CM-108 Protek Capacitance meter measured the samples within 1% of 475uF. According to Keysight's specifications the meter accuracy is .5%.
Not knowing where to post this thread, it was also posted here;
Keysight Technologies Support Forums » Instrument Forums » RF & Microwave Network Analyzer Forums » Handheld RF and Microwave Analyzers.
There were a few replies but not from a Keysight person.
Contact the shop which you got this product from, so THEM to test and verify the problem if there is one.
Regards.
I get the impression Keysight sees these forums more like Apple's groups of user to user. It is not uncommon to see a Keysight reply, but for sure if you call the tech support engineers, you will get a Keysight answer.
I did a quick random check of a nichicon 470 uF, 100V, VX(M) series electrolytic:
100 Hz 461.3 uF; 120 Hz 459.9 uF; 1kHz 448.6 uF.
Then, unfortunately with a number of vintage LCR meters (two hp, and an ESI), and the C scales of several Agilent DMMs, I realized that I have do not have any other C meters above 100 uF. The Agilent 34461A (which lists 100 uF as Max) does read 441 uF, however it is beyond the rated scale.
No time today to try fundamental measurements by RC time constant, RLC dividers/resonance, etc. Also, as Dr. Kirby noted, some other methods might give a "correct" but different value for different measurement techniques.
Also, note that the error is not 0.5%, but 0.5% plus 5 counts. Still more than you observe, but larger than 0.5%.
There is a webpage about out of scale U1733C measurements here: http://www.gellerlabs.com/Agilent_U1733C.htm
but, you are definitely in scale for 470 uF at 100 Hz.
Tell us what you learn later.
What a pointless link.
Cap measurements them should be made according the cap manufacturer instructions = datasheet -> capacitor model -> capacitor size -> specified frequency.
If you like to blast Keysight you can do that freely because their LCR accuracy this is calculated by the assumption that the end user he should add in the measurement 3~10 counts.
How in earth you will remember that?
Many of us are very pleased with this instrument for what it is. Some are not, so be it, that is life.
Not sure what the point is of the endless posts attacking this relatively minor instrument in the Keysight line? And, now attacking other members and what they find interesting and important?