Products > Test Equipment
UNI-T UT61E Multimeter teardown photos.
hgg:
In series? In Parallel?
Can you suggest a combination that will suit the UT61E?
Thanks.
SeanB:
Slap the 3 low capacitance MOV units in, and be done with it. The limiting factor will be the PTC in any case, 1kV and it will fry itself apart in a second or so. Choose the voltage to suit your normal use, and as they mostly come from RS in packs of 10 you will have some spares. If you do blow them up the meter will not survive in any case.
In my case I just used 2 275V MOV units ( 7mm) in series, as I did have the remains of a 10 pack around, so using the 6 was easier than either placing an order and wait till I had the minimum order price in other parts, or paying the $20 courier charge RS puts on here for small orders. Still have 1 left, after replacing 3 MOV units on other equipment.
hgg:
Hello SeanB,
Do you know if the varistors will affect the Capacitance measurements?
Did you check it on yours?
What about these GDPs?
http://www.ebay.com/itm/2PCS-2RM470L-8-470V-2R470-10KA-Ceramic-gas-discharge-tube-Mine-management-/261991644243
SeanB:
RS ones will add 300pF to the capacitance, but as you pretty much always use REL mode in capacitance from new it does not make a difference except on the lowest values. Might slightly drop frequency response, but as it is only specced to 1MHz in any case the slight drop off will not worry much. If you want frequency you are pretty much only measuring mains or up to 20kHz VFD values in any case, higher you want a real frequency counter, and AC will not worry at all, the RMS converter is the limiting device.
hgg:
What about this comment from a different thread ?
https://www.eevblog.com/forum/testgear/ut61e-drift-and-recalibration/75/
"I think that MOV-s are inadequate for UT61E, because you lost the hight impedance input on mV range.
You can find GDT down to 70-100V."
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version