Pulse width calibration
BROWNK@sask.usask.ca
Thu, 30 Mar 1995 16:13:18 -0600 (CST)
As you may be aware, we have had some problems with our BSV-7 unit on
our AM300 spectrometer during the past few days (many thanks again to those
who faxed schematics to us). We now have what appears to be a respectable
pulse again but when I did a pulse width calibration I decided to vary the
pulse width from 2 usec to 70 usec in 2usec increments and found that the
peak profile does not follow a sine curve. The curve peaks at about 14 usec
(presumably the 90 degree pulse width) and then drops off slowly to null at
about 50 usec. I'm fairly sure that there is no arcing in the probe since we
have a 6 dB attenuator on the output of the power amp, although ....
Any ideas what could be at the root of these observations? Is it possible
that there is some adjustment required on a board somewhere?
Keith Brown
University of Saskatchewan
Saskatoon, Saskatchewan
brownk@sask.usask.ca