I'm simply trying to characterize a MPF102 JFET. I attached my HP6625A Power supply as follows:
CH1 : 0 - 12VDC with the + on Drain and the - on source CH2 : 0 to 1V (actually 0 to -1 because I place the + on the source and the - on the gate).
While I step up the Drain to Source voltage (CH1) while holding the Gate to Source voltage at 0 (ch2).... I start to get some pretty serious oscillations on both channels (3.62 MHZ).
Any idea why? Shouldn't the HP power supply be able to hold these values steady?
I know that my two probes (for my Tek 3032 scope) have 8pf of capacitance. I am also using about 4 ft 16 gauge twisted pair leads coming from the power supply.
I just purchased the HP power supply off of Ebay and everything up to this appeared fine. Could this be an equipment issue?
Thanks to anyone who might suggest a reason.
Stephen