30 May
2008
30 May
'08
10:23 a.m.
David,
I agree with whomever wrote about sticking with Tek analog scopes. If you
want your squarewaves to look square though you need a bandwidth 10 times
the signal of interest ( i.e. 20 MHz squarewave 200 MHz scope ). The more
Actually, you can get away with less (3 times is the absolute minimum,
for obvious reasons) if you know how your 'scope is going to behave on
that sort (and frequency) of signal. You'll not get the textbook traces,
but if you know what to expect, you'll know when it's not right...
odd harmonics you can push through the more "
square " it will be, and you
would like to pass the 3rd, 5th, 7th and 9th harmonics if possible. I still
like my OLD Tek ( 5000 BTU, Ethan could use this in the South Pole ) 535A
with CA plug-in for most old vintage stuff. The display is still as crisp
And my 555 is alongside me right now :-)
and bright as the day I bought it ( used at a salvage
sale ). I have a high
About 15 years ago, we got a new Tek CRT 'scope where I was working. I
tried it out, and to me the trace wasn't sharp. I complained to Tek, who
claimed it was within spec, and asked what I was comparing it against. I
said 'My old 555 at home'. Their comment was that the old 500 series had
wonderfully sharp traces (if correctly set up), and nothing afterwards
comes close...
dollar Tek digital LCD scope but was very disappointed
to find out the 2 GS
/ second front end is only 8 bits wide !! I only use it if I need a
hardcopy for a customer of some signal or to capture a signal that only
happens once. The signal displayed is only as " crisp " as the dots in the
LCD are small. Good luck in your search. Now, if you could find an HP
LogicDart cheap somewhere ......?
Good luck :-). That's a wonderful instrument that was totally
mis-marketed by HP, so nobody tired to buy them until it was too late :-(
-tony