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Oscilloscope question...

Mika Salmi All Messages By This Member #491 Hi, I need some help from experts. I have possibility to have handheld oscilloscope from Velleman. There is two models: HPS10 and HPS40 The difference betveen these two is maximum sample rate ( 10MHz versus 40MHz ). And also HPS40 have adjustable trigger level ( in 8 steps ). My need is check encoder pulses ( TTL and Differential 5V ) and DC voltage riple. Any advise which one I should get? HPS40 is more expensive but is HPS10 enough for use I descripe above? Regards Mika
Peter Homann #493 If you can afford it get the HPS-40. The main limitation on any scope is the sample rate. Eventually you will want to debug a problem that requires a higher sample rate. The other reason is that although the frequency you are looking at can be handled by the 10MHz scope, you may say, have a glitch or noise whose duration is shorter than the sample rate of the 10MHz scope. Cheers, Peter Homann mailto:Peter.Homann@... Adacel Technologies Limited, 250 Bay St, BRIGHTON, 3186, AUSTRALIA <> Telephone +61 (3) 8530 7777, Facsimile +61 (3) 9596 2960 Mobile 0421-601 665 toggle quoted message Show quoted text -----Original Message----- From: Mika Salmi [mailto:mika.salmi@...] Sent: Saturday, 23 August 2003 5:32 PM To: mach1mach2cnc Subject: [mach1mach2cnc] Oscilloscope question... Hi, I need some help from experts. I have possibility to have handheld oscilloscope from Velleman. There is two models: HPS10 and HPS40 The difference betveen these two is maximum sample rate ( 10MHz versus 40MHz ). And also HPS40 have adjustable trigger level ( in 8 steps ). My need is check encoder pulses ( TTL and Differential 5V ) and DC voltage riple. Any advise which one I should get? HPS40 is more expensive but is HPS10 enough for use I descripe above? Regards Mika To unsubscribe from this group, send an email to: mach1mach2cnc-unsubscribe@... Your use of Yahoo! Groups is subject to
Luis Serrano All Messages By This Member #497 Hello Mika, No question, go with the higher sampling rate. I started with a 20Mhz and now I have a 100Mhz looking after a 200Mhz. The reason why is because the osciloscope is a tool to "see" what is happening as you know, but what if you don?t "see" the noise, for example in the step & dir lines. My personal oppinion is not to start with less than 60Mhz. About the triggering features the more the best you will find yourself playing with them to find the disturbing peak in the line. Luis.

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