In message <[EMAIL PROTECTED]>, "Ulrich Bangert" writes: >There is however one annoying fact: If I use the instrument in >"frequency" or "period" mode, >[...] the frequency of the repetitive waveform will change and >drift by an amount of some 100 Hz up to a few kHz so that my counter may >read 996 kHz after a few minutes with the drift getting smaller over >time as the device warms up.
You need to remember that in period/frequency mode the 5953 acts like two independent one-shots biting each others tails, so the frequncy you get depends not only on the precision of the pulses they emit, but also on their trigger circuits getting it right. In addition there is an analogue ramp based vernier delay generator in each channel which in my experience is very temperature sensitive. So if you want precision: let it warm up, and be very careful about calibration. Poul-Henning PS: I'd love a manual copy in PDF, the manual I have is a mess of photocopies an wrong order etc. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
