I use the same cables and terminations with my 7A16 and 7A19 with no problems. I've checked and tried different feed-thru terminations and cables, with no difference.
The same cable and termination (they are labeled and distinguishable) I used to calbrate this 7A16 about one year ago.
The problem had probably been dormant for some time. I realized it a cople of weeks ago while I was making measurements on an RF oscillator output using the offending 7A16A.
As the frequency changed between 100MHz and 200 MHz, there was a point where the amplitude of the generated sinewave decreased and then rose again, something that did not happen to me with the 7A19.
Suspecting something anomalous in the bandwidth in the 7A16A, a quick check with the PG506 revealed (to my regret) the problem I am now trying to solve.
The slow start of PG506 is due to the fact that, when i took that photo, its output signal was very low. For very low signals my PG506 always has a slow start, that decresases with increasing amplitude. In fact I usually use a x10 attenuator to circumvent this idiosyncrasy when calibrating the 5/10 mV range. Which I didn't when I took the photos with the 3340.
I remember that it was talked about in other topics a long time ago.
Anyway, this evening I will try some other experiments.
Max
