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Is there an inexpensive DMM with FAST MIN/MAX (NOT just MAX) function?
Adam Baum:
--- Quote from: myf on February 05, 2024, 04:38:35 pm ---Hello,
The (old) ut-61e has min and max values.
The value read is a very fast transient, not the average over a period (0.5s). I read about 20A or 30A when charging a 4700 µF capacitor with a laptop-type power supply (36V - 4A).
--- End quote ---
I own a Fluke 77 and a Fluke 17B and, of course, the 17B+ has min/max and not the 17B. Rather than spending $188 for a 17B+ just to get that function, I'd like to spend as little as possible.
Your UT61E lead got me there, so thanks. It looks like the UT61B+ (with min/max) or UT61D+ (with min/max and peak min/max) are the ones to go with. The 250us capture time is the same as with the much more expensive Flukes with min/max.
mwb1100:
--- Quote from: Adam Baum on February 06, 2024, 11:46:42 pm ---The 250us capture time is the same as with the much more expensive Flukes with min/max.
--- End quote ---
Where did you find this spec? I can't find it in the Uni-T UT61+ data sheet or user manual.
jfiresto:
If the meter uses a DMM chip, have you checked its datasheet?
The datasheet for the Cyrustek ES51962 in my B&K 390A quotes a worst case error for a 10µs pulse of +/-2% + 25 counts.
Adam Baum:
--- Quote from: mwb1100 on February 07, 2024, 05:28:29 am ---
--- Quote from: Adam Baum on February 06, 2024, 11:46:42 pm ---The 250us capture time is the same as with the much more expensive Flukes with min/max.
--- End quote ---
Where did you find this spec? I can't find it in the Uni-T UT61+ data sheet or user manual.
--- End quote ---
Somewhere in this section on their slow as snot web page :
https://meters.uni-trend.com/services-support/faqs/
"For peak measurement: Maintain the MAX/MIN value of pulse signal automatically, the response time of logging MAX/MIN peak value is short (about 250us), a transient value can be measured accurately through this function."
The Fluke figure came from here:
https://www.fluke-direct.com/pdfs/resources/fluke/How-to-use-Fast-Peak-Min-Max-on-your-DMM-usd.pdf
The FAST MN/MX (187, 189) or Peak Min/Max (87V) function is restricted to the voltage and current measurement. FAST MN/MX or Peak Min/Max can be used to capture intermittent or transient events that occur on a monitored signal over time. Events as short as 250 μs (or longer) can be captured...
rsjsouza:
In my tests with peak mode at a low level (5V), the UT61E (non plus) was the champ (1us) when compared to all others.
I did a video comparing several meters (in portuguese, sorry), Skip to 13:58 for the UT61E.
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