I am hoping to use my PNAX to determine turn on/off response times of a MMIC amplifier. I have a CW sweep setup with the sweep externally triggered by the enable line of the MMIC and measure the output power when driven from Port 1 (B,1). The IFBW is set to 15 MHz. The best sample period I can achieve is ~50 ns. Are there any settings I can change to improve this sampling rate - 50 ns is a little coarse for my application, if I can achieve 20-25 ns, this would really help me.
If you use the narrow-band pulsed application, you can do CW pulse-response time (same as turn on time) measurements down to 10 nSec resolution, or even smaller (I'm not sure what the lower limit is for narrow-band pulse resolution but it should be arbitrarily small).
The trick is this requires a repetitive measurement, but as long as your dut response is consistent, it should be no problem. You can always make a very long pulse-repitition and so not have any pulse-to-pulse effects. Otherwise, 50nsec is the limit in a wide-band measurement mode.
For the narrow-band mode, you need option 008; if you don't have it, you can probably convince jvall to shoot you a temporary license to test it out.
Good to know I can't squeeze any more gas out of the thing in wideband mode... Thanks for the thought on -008 - I just checked the pricing and I probably would struggle to justify for this application. I can probably get quite far with detector diodes and a digitizer....