🚀 go-pugleaf

jeh@cmkrnl.com wrote:

> I'll second this, and LOUDLY, too.  

> It appalls me to see frequency counters (and instruments like DMMs that include
> counters) that have no trigger level control, no input coupling selector (AC or
> DC), no edge selector (rising or falling).  You wouldn't buy a triggered-sweep
> scope without such controls; of what possible use is a counter without them? 


> 	--- Jamie Hanrahan, Kernel Mode Consulting, San Diego CA
> Internet:  jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
> Uucp:  ...{crash,eisner,uunet}!cmkrnl!jeh

To be more specific, Fluke 87 has some choices for triggering:
on 400 mV ac range about 150 mV sensitivity, no offset,
on dc ranges the trigger level is about 10% of the range,
except for the 4 Vdc, which is meant for TTL with 1.7 V
threshold. One can even choose rising or falling edge.
It should also work on current measurement ranges.

I agree with the opinion that a counter cannot be used to
determine the waveform, one can measure the frequency of a
known waveform with much higher accuracy than a scope allows.
In case of slightest suspicion in the readings of a counter
you need an oscilliscope.

Ylo Mets.