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Please check which the limiting frequency in practice gives industrial device (MM).
Need: ostsillogaf and a semiconductor transistor in the metal case
Test procedure.
1. Any working transistor in a metal housing with a file and pliers to dramati hat. Get a solar cell produces electricity when exposed to light.
2. Connect it to the oscilloscope and put close to the blinking LEDs. Turn off the lights is optional. On the oscilloscope will appear to blink rate.
3. Someone has forgotten or doesn't know how to calculate the frequency from the oscilloscope screen (itself for a long time did not know, although often used appliance) prompt. Let's measure the length of the period for horizontal (up-wave and down-wave) or a single half-wave, and then multiply the length of half-wave two. Translate miles 10 to 3 or 10 micro seconds per 6 seconds. Now divide 1 by the resulting number. The result is the frequency generated by your MM.

Why is it so difficult then?
In the passport it is written - 42Гц (this is the table tightly sewn).
And to know the limit value (possible in principle) should again see the passport, but only on CD.

also written on the fence ...
For me, practice and own experience, even by proxy, more important than the accompanying document.

"practice" we have a periodicity of one to two months,a pattern?

NAIL !

What do you have suspicions arose in the electronics ?

I experience about 20 years ago, held wrote. Don't believe it. He began to solovetsy

Wash it all easier
Insert the exit mindmachine into the slot
computer microphone
Run any audio editor
Write-signal
Watch it
To find out the frequency is not too delving into the documentation
Just select one or more selection
wave periods and look at the time which corresponds to
selected area
Next, the frequency count is not difficult
I have done this for the sound
The result coincided with one of the values is pleased frequencies
(Editor for innerpulse) to 0.1 Hznext error
measurements - you need more periods to allocate, and I did not put such purpose
The goal was to see how made breathing session
I assume that this can be done for output
for points - the connectors match