Is there an inexpensive DMM with FAST MIN/MAX (NOT just MAX) function?

[Adam Baum]

Question in thread title.

[bdunham7]

Sure.  How fast and how inexpensive?  You'd need to quantify those attributes to get a meaningful answer.

[myf]

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).

[Fungus]

What bdunham said, and:

What sort of signal are you looking at? What time frame?

You can get pocket oscilloscopes for about $30. They have very fast min/max over short periods of time. 

[RtBNL]

Both the Brymen 869 en 789 have a very fast min/max (crest function) they both measure the peaks op(~+ & - 325v] on the wall outlets that give ~230 volts.

[Adam Baum]

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).

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]

The 250us capture time is the same as with the much more expensive Flukes with min/max.

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]

The 250us capture time is the same as with the much more expensive Flukes with min/max.

Where did you find this spec?  I can't find it in the Uni-T UT61+ data sheet or user manual.

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.