Products > Test Equipment
Fluke 189 fails capacitance auto range, other
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Finderbinder:
Actually here are few problems.
1. When I turn wheel to capacity, it shows 66pF (without leads). It is offset, but stable. Is it possible to correct offset?
2. When I measure say 470uF (on auto range), it shows ok. Then I disconnect this cap and... device starts to jump in different ranges, shows different values, include negative; and this may last infinitely or sometimes it returns to 66pF. If I connect say 40nF while it is jumping it shows 40nF correctly and upon disconnecting it returns to 66pF (always). Or I can turn wheel forth and back to capacity to return it to 66pF.
3. DC mV sometimes shows tens of uV with probes shorted, sometimes few uV, and sometimes 0 or negative values (unstable).
4. AC mV shows ~150 uV with probes shorted (stable?). Reduces few times if I keep my hand nearby multimeter (even not touching it).
5. AC V shows ~3mV with probes shorted (stable?).

Device is very clean inside, also outside.

Any suggestions?  :-//
Fgrir:
Sounds to me like everything you describe is normal.

1) I see 64pf without leads on my 189, Fluke specs 2% + 5pF accuracy in the lowest cap range, but with the following note:

--- Quote ---using Relative mode (REL ∆) to zero residual on 1.000 nF and 10.00 nF ranges
--- End quote ---
2) I see similar behavior from cap autoranging on mine, seems to be noise pickup preventing it from ranging down.
3) Specified accuracy in the lowest mV ranges is 20uV, so might not be out of spec. Are you sure your shorting connection is stable?
4) and 5) All AC ranges have the following note:

--- Quote ---A residual reading of 8 to 180 digits with leads shorted, will not affect stated accuracy above 5 % of range
--- End quote ---

mwb1100:
And just to help confirm what @Fgrir said, my 189 behaves pretty much the same except:

  - for #2 when I have leads in the meter it settles to about 87nF instead of 66nF
  - for #4 my 189 shows about 70uV
bdunham7:

--- Quote from: Finderbinder on March 18, 2023, 09:12:56 pm ---Any suggestions?  :-//

--- End quote ---

Read the specifications section of the manual?

Just now I pulled my 189 off the shelf, turned it on to capacitance and it read "0.066 nF".   :)
coromonadalix:
same for capacitor 0.065 nF   push REL  all goes to zero

0.0028 V    ac  shorted probes
0.050 mV  ac  shorted probes
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