Tektronix 2101 Pulse Generator, serial number B040xxx, restricted
pulse width adjustment range
I purchased this pulse generator used in 1994 from Dumont Electronics
here in Montreal Quebec. It worked fine until last year. I could not
get any pulse with a larger width than 60 ns or so. Pulse duration
range switch did almost nothing, pulse duration variable control did
allow the pulse width to vary from 10 ns to about 60 ns.
Troubleshooting section in manual 070-1029-00, dated 1970 April, is
not very useful. Found CR182 to be defective, it conducted in both
directions in the diode test function of my multimeter. Removed from
circuit is measured about 300 ohms in both directions. Diode is
152-0322-00 a silicon Tektronix special, manufactured by or for them
or reworked or checked. So I looked at the parts list and found
another diode, CR335, with the same Tek part number that was changed
after serial number B040000 to a 152-0141-02 a 1N4152. And old
General Electric data book shows this diode to be similar to the
widely used 1N914. Replaced the diode with a 1N914 and the generator
works fine. Touched up the calibration, last cal in 1986, an the unit
is within specifications.
Daniel from Ville Saint-Laurent, QC, Canada.
