One thing the 465 did really well was to show single events. I remember
using one to check a 100 nano second pulse that I triggered by hand. In
full room light, the 465 had plenty intensity to show that pulse and
burn it into my eyes while sweeping at 100 ns per cm. I bought the 475
after that and while it does have twice the bandwidth and 2.5 times the
sensitivity, its CRT can't do what the 465 did.
73, Jerry, K0CQ
On 7/11/2010 1:49 PM, Charles P. Steinmetz wrote:
Mike wrote:
What about the more uncommon brands? Outside of Tek, B&K, Sencore are a
number of more high end and less expensive scopes. I am sort of "Joe
average" ham - build some, design a little, and want to design more and be
able to troubleshoot deeper.
Outside of Tek and HP, there simply isn't much that passes as a
useful scope. Phillips and Hitachi both made some OK scopes, but
B&K, Leader, and Sencore never did IMO. The lesser scopes don't
trigger properly, drift, don't hold calibration, have nonlinear
sweeps, have peaky high-frequency responses, intermittent switch
contacts, etc., etc., and are often unreliable and
failure-prone. IME, the Tek 22xx "value" series shares some of these
attributes -- I'd stick with the 4xx or 24xx series if the price is> $75.
Can someone get by with less? Sure -- just like Isaac Stern will
sound good on any fiddle you hand him. But the casual user is even
more in need of decent equipment than the expert, because (s)he needs
to be able to count on it without having to work around and take into
account a host of irregularities. And since good HP and Tek scopes
are available for so little these days, there is just no need to
consider others unless the budget is truly miniscule (< $100).
I don't think I need a 200 MHz all-the-bells-and-whistles scope, but I'm not
sure a 50 MHz is the best choice either - at least based on the information
I received from some of the knowledgeable guys here.
There is a reason that the 100 MHz dual-trace delayed-sweep
"portable" bench scope is, and has been for 40+ years, the workhorse
of the industry. Since you can get a good one for $100 or less if
you shop carefully, why not, unless you're looking for something
cheaper than $100. As for the presence or absence of features, any
HP 17xx or Tek 4xx or 24xx comes with a set of features that you will
eventually be very glad you have, even if you do not yet know what they do.
Best regards,
Charles
Agreed, 73, Jerry, K0CQ
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