Products > Test Equipment
UT61E drift and recalibration
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Nuno_pt:
Franky,

Thanks for the offer, I just need to know the sizes, I'll be ordering a batch of components from Farnell and from Mouser, for other projects, so I'll include this on the batch. 
iloveelectronics:

--- Quote from: iloveelectronics on February 07, 2014, 12:37:30 am ---
--- Quote from: Nuno_pt on February 06, 2014, 05:01:43 pm ---I need the cap for C50, and resistors for R52, R53, can't find them here local.

--- End quote ---

I have some of those I can send you if you don't mind the small postage fee and the wait.

--- End quote ---

don.r is correct. The cap is 0805 and the resistors are 0603.
Nuno_pt:
Hi ali,

Just received my UT61e today from Franky, it brings one fuse of 10A and another of 1A (bs1362), still brings ply 2 PTC's, and still miss the Ext Vref from factory.

 I'll only upload 3 pictures so you can see this board.
Wytnucls:

--- Quote from: 3roomlab on April 10, 2014, 03:10:52 pm ---and in the midst of calibrating, i find that the UT61E seems to take some time to settle to a stable reading in AC, does that happen to all of you 61E users? i have other meters and it seems this settling time is too long for UT61E.

--- End quote ---

It is normal. It is a quirk of the AD737. The true RMS to DC converter has a long settling time for small input levels. The settling time is also influenced by the value of the external averaging capacitor (33uF on the 61E).
Wytnucls:
Well I think 1 volt or 200mV is the maximum input for the converter, so depending on the scaling, 5s for 5Vrms may be ok. Mine is settling after about 4s. The 71D in 8s (AD636 CAV 10uF) and the Gossen 26S in about 5s also.
No much to worry about.
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