26 May
2008
26 May
'08
11:05 a.m.
Hi
first of all, I have one, you can get it, please let me know. Its a
100MHz, two channel scope with second timebase for magnifications,
but?its analog not digital.
For slow signals usually present in classical hardware, thats no problem.
And you also could look at www.testequipmentcollection.com[1]
I bought my 'new' one there. (350Mhz, Hybrid scope, 2 channels + 16
digital logic analyzer).
I also collecting classic computers, take a look at www.tuko.at[2]
--> Computermuseum.
With best regards
Gerhard
Links:
------
[1] http://www.testequipmentcollection.com
[2] http://www.tuko.at
26 May
26 May
7:57 p.m.
In article <20080526200516.8z3m296ds8s0og8c at webmail.izone.at>,
DI Gerhard Kreuzer <gerhard.kreuzer at liftoff.at> writes:
And you also could look at
www.testequipmentcollection.com[1]
I think you mean <http://www.testequipmentconnection.com/>
--
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9:07 p.m.
Gerhard wrote about a 100 MHz oscilliscope:
For slow signals usually present in classical
hardware, thats no
problem.
That's true.
Many people have the mistaken belief that a 'scope with 20 MHz bandwidth
is adequate for looking at 20 MHz digital signals, but that is not true.
For digital signals you usually want bandwidth of at least five times the
peak frequency of the system, and preferably more. It's hard to
diagnose problems when fairly square edges on signals look like
sine waves on the 'scope.
Eric
29 May
29 May
2:47 p.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
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 bright as the day I bought it ( used at a salvage sale ). I have a high
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 ......?
Best regards, Steven
Gerhard wrote about a 100 MHz oscilliscope:
For slow signals usually present in classical
hardware, thats no
problem.
That's true.
Many people have the mistaken belief that a 'scope with 20 MHz bandwidth
is adequate for looking at 20 MHz digital signals, but that is not true.
For digital signals you usually want bandwidth of at least five times the
peak frequency of the system, and preferably more. It's hard to
diagnose problems when fairly square edges on signals look like
sine waves on the 'scope.
Eric 
30 May
30 May
7:23 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
3:30 p.m.
Tony Duell wrote:
I agree. They fetch serious money on eBay. HP has a history of
discontinuing products when there's still significant demand. Dumb,
dumb, dumb.
-Dave
--
Dave McGuire
Port Charlotte, FL
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.
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...
The only one I've seen that does (my first was a 545A) is the 453.
NOT the -A variant, but the original 453. Fantastic trace quality.
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 :-(
8:33 p.m.
Ah Tony,
I like my squarewaves to be really SQUARE. Sometimes when they aren't,
that's the real problem ( like a sloppy risetime / falltime ? ) when you are
troubleshooting. Therefore I will stick by my 10 times BW statement. I like
my woman round and curvy, but not my squarewaves. At the risk of being
hated by all on the list, I STOLE an HP LogicDart off of E-pay for $140 from
someone who didn't know what it was ( with probes and the whole enchilada,
even a carrying case ) . I guess the gods of technology were shining upon me
that day. Hasn't happened since though, so I guess I used up my favors. You
can troubleshoot with a logic probe and a DMM but I prefer not too if I have
the option. With a LogicDart though you can conquer the world.
Best regards, Steven
>
> 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
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This message was checked by NOD32 antivirus system.
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2:33 p.m.
Scanning wrote:
LCD are small. Good luck in your search. Now, if you
could find an HP
LogicDart cheap somewhere ......?
I'm pleased to report that I was given an HP LogicDart the other day.
Now, I'm looking for the HP 82240B infra-red printer for it...
--
John Honniball
coredump at gifford.co.uk
6:38 p.m.
Scanning wrote:
The phrase 'you lucky beggasr' springs to mind :-)
LCD are small. Good luck in your search. Now, if
you could find an HP
LogicDart cheap somewhere ......?
I'm pleased to report that I was given an HP LogicDart the other day.
Now, I'm looking for the HP 82240B infra-red printer for it...
It's the same printer as is used with the HP48S/SX/G/GX, the HP41 (with
the IR module), etc. It's a lot easier to find that the LogicDart. I
picked one up from a frined at HPCC along with a lot of other old HP stuff...
Be warend that the IR transmission to the printer is one-way only (no
handshake, even) and is none-too-reliable. I find that perhaps one dump
in 5 is mangled and has to be done again. You also have to position the
LogicDart and printer just right (not easy when you've got the former
balanced on top of a PDP11). The thermal printing doesn't last that long
either (it fases with time), but that's easy to get round by photocopying
(or I guess scanning) the printouts.
-tony
6053
days inactive
6058
days old
8 comments
7 participants
participants (7)
-
ard＠p850ug1.demon.co.uk -
coredump＠gifford.co.uk -
eric＠brouhaha.com -
gerhard.kreuzer＠liftoff.at -
legalize＠xmission.com -
mcguire＠neurotica.com -
steven.alan.canning＠verizon.net