[Boatanchors] Hand held frequency counters?
Brian Clarke
brianclarke01 at optusnet.com.au
Thu Dec 31 23:06:34 EST 2009
I do recall when the Optoelectronics units first came out that they
'appeared' to be accurate. Crikey, with all those display digits, they must
be accurate. Err, mustn't they? This was an argument I had many times with
tech college students who had just acquired their 4.5 digit hand-held DMMs -
they had no idea what 'accuracy' meant. But really, all that Optoelectronics
counters had going for them was short-term reliability, ie, if you measured
the same thing within a few seconds, you would get the a similar answer.
Over the longer term, there was no such guarantee - which side had wandered
or jittered the most - the signal you were measuring, or the reference
inside the Optoelectronics device? 'Twere an interesting marketing exercise
to substitute apparent resolution for non-apparent non-accuracy.
Think about this for a wee moment. Why do you think that all the better
quality counters are fairly large, ie, not hand-held or pocketable? How do
you insulate a crystal from the variability of outside temperature? How do
you develop a front-end gate that presents a flat impedance and flat
sensitivity over several decades of frequency? How do you develop ... Oh, I
don't need to go on. If you don't know what I'm talking about, then don't
complain if I tell you that your carrier wanders or is not where you claim
it to be.
Marketing is not to be confused with truth. Is Optoelectronics still in
business? I could find no reference on the web.
Can I also suggest that cutting the long tails to email trains is to be
admired.
73 de Brian, VK2GCE.
More information about the Boatanchors
mailing list