Hi all,
Firstly, thanks to cybernet, zombie28, marmad and all who have contributed to developing the contents of this thread.
I can confirm the following:
DSA815-TG: Preamp, 10Hz RBW & ADV Measurement unlocks work.
cybernets modified DS4k firmware (DS405xUpdate) has upgraded my DS4014 to 500MHz with 1ns timebase. No observed crashes or negative effects.
DS4k all options unlocked works fine.
I used my DSA815-TG to test the 500MHz BW upgrade on the DS4014.
I used a modified setup as described by Dave in
I set my tracking gen to -20dBm, swept from 0Hz to 1.4GHz with a sweep time of 14 seconds. This corresponds to 100MHz/s.
I set the DS4014 to 1sec timebase, 10mv/dev scale. This represented 100MHz/div over the 14 divisions on the DS4014. Additionally, the horizontal reference for the DS4014 was set to 'Trig Pos', and moved to the extreme left
Both instruments were set to external trigger (negative edge on DSA, pulse mode with pulse width > 1.5sec on DS4k). The trigger was a 5V square wave with 15 second period, generated from my DG4062. (at this speed an arduino could produce the trigger)
The results for different BW limits are attached. An envelope detector on the DS4k would have come in useful (If it exists, its bloody hard to find and I've not checked the manual yet). I measured the TG output with the SA side of the DSA815. An excel plot of the extracted CSV data is attached also. For some reason I cant get the DSA to print screen to a USB.
Also, I was not able to figure out how to save CSV data at controlled time intervals on the DS4k or DSA. The two units seem to default to 600 samples (DSA) and 1400 samples (DS4k). This made it difficult for me to align the two data sets in order to subtract the TG output from the frequency response of the DS4k.
You can visually see that at 500MHz, the weird response is linked to the TG output.
Note the black vertical line is just the oscilloscope trace sweeping accross.
SMA cables were used + SMA to BNC adapters. Cables and connectors are good for 12GHz and result in a 1db (tbc) loss at 1G
Regards
Tabs
Edit: I ended up using advanced math> abs(CH1) for envelope detection.