| ??? 06/17/09 15:36 Read: times |
#166191 - welec Responding to: ???'s previous message |
Kai Klaas said:
Hi Ap,
with nearly all scopes there can be contact problems due to dirt and oxids after some years, like mentioned here: http://www.fullnet.com/~tomg/tekclean.htm Avoid de-oxid chemicals, though, they make the situation even worse, usually. Use only isopropyl alcohol for the contacts. Another cause of noisy lines on the screen can be common mode noise on protective earth or common mode noise hitting the screen of probe. Give snap ferrites on the mains and probe cable a try, then. Another cure is to use differential probes. Once we had a problem with extreme jitter in the trigger delay of a Hitachi scope. Very nasty if you don't know that its the scope which brings the jitter... Kai Hi Kai , I actually would like to quote this too against noise issues, this one is from welec http://www.welec.de/english/0...W2012A.htm "Vertical Accuracy ±0.5% bei 5V/div, 500mV/div, 50mV/div ± 0.5% at 5V/div, 500mV/div, 50mV/div (keine Eigenstörung, kein Grundrauschen) (no self-interference, no noise) ±5% at 2V/div, 1V/div, 200mV/div ± 5% at 2V/div, 1V/div, 200mV/div 100mV/div (wenig Grundrauschen) 100mV/div (low noise) ±10% at 10mV/div and 20mV/div ± 10% at 10mV/div and 20mV/div (mit Grundrauschen) (with noise) " Its on their site and they declare it but tektronix doesnt . There is some discussion going on http://www.edaboard.com/ftopic81445.html . Regards -Ap PS: welec is transparent in their deal ,is 16K memory for DSO too low . Sorry I ask this as I only use CRO . |
