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Jan 8th 2019
EDIT : Just for clarity of my posts and further down in relation to the problem found with the capacitance measurement.
Below was in response to a previous members post relating to a bug (as noted above, and yes this is not the correct thread for this stuff but anyway..).
A number of posts by another member were removed by them which generally makes the thread seem disjointed with my responses.
But as the detail of my posts are still of interest I will leave them here.
I did ask in the other thread when the discussion moved there to move the posts from here but that did not happen and that time window has long passed.
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Okay I updated my kickstarter meter (1st batch) to firmware 1.57. And tested some lowish value capacitors. All connected to the meter via short leads and croc. clips.
The Meter was in Auto ranging mode and gave quick measurements on the three capacitor values when connected.
first value
100pF silver mica.
Initial connection showed 0.100 nF +/- 1pF -2 pF. With no capacitor connected the meter reads 0.000 nF
Repeated disconnect and reconnect gave same result. Leaving the cap connected and then turning meter OFF then ON from the RH OFF position did not affect the measurement.
Now using the LH OFF position introduced errors into the measurement, which then also persisted when also using the RH OFF then back to ON. A 100 pF with a variable reading
around 30 pF (not consistent).
Also cycling through the modes on that switch position did not restore correct measurement.
1 nF polystyrene
Initial connection showed 0.990 nF
Repeated connection gave the same result. Leaving the cap connected and then turning meter OFF then ON from the RH and the LH OFF position did not affect the measurement.
10 nF silver mica (a L&N standard cap !)
Initial connection showed 10.110 nF. Cycling through the modes back to capacitance again now gave a reading of 10.040 nF. (This value corresponded to my Fluke 87V after I REL the 0.26 nf Offset out
.)
Repeated connection gave the same result. Leaving the cap connected and then turning meter OFF then ON from the RH and the LH OFF position did not affect the measurement.
Last test was to 'pad' the input capacitance with the 1 nF and REL it out then connect the 100 pF and repeat that a number of times.
The measured value was 0.100 nF and was the same each time it was re connected.
No drift measurement done
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NOTE :When I went to the firmware download page I noted a message above the firmware list saying quote:
"NOTE: This version has a change that will not function correctly with the app in capacitance range. An update to the app will be released soon."
Its not clear if this refers to the current firmware on the list with the DMM and the logging app or just the capacitance mode on the meter itself
.
Or this message has been there for many firmware revisions !, as I only just updated from 1.17 its been a while since I looked at the firmware page.