Products > Test Equipment
DPO3000 Hacks
analogRF:
can options (not necessarily the BW) be enabled on DPO4000 using the SCPI commands?
VooDust:
--- Quote from: analogRF on August 28, 2020, 01:37:35 pm ---But w.r.t. calibration, did you check the bandwidth? is it in fact >=500MHz?
--- End quote ---
I probed a 433Mhz carrier signal earlier this week. It allowed me to build a clone of my garage door opener. Since I only own 200 MHz probes, I presume the signal was attenuated heavily.
However, at 100 MHz, or 150 MHz (which is the available low pass setting when running the 500 MHz model) the RF signal was virtually nonexistent! With 500 MHz however, I got 800mV peak-to-peak!
So yes the upgrade is the bomb! I'm not able to provide details like trigger sensitivity, rise time etc. since I lack the equipment (and knowledge).
Cheers.
VooDust:
If only I could upgrade from 2 to 4 channels... I would trade the 500 Mhz for this |O
smaultre:
Sure i make some research. It works, but there in the 4054 has no much dac's and demux chips on the board physically :-//
Its the perfect way upgrade 4034 to 4054 !
analogRF:
--- Quote from: VooDust on August 28, 2020, 08:38:04 am ---I upgraded my DPO3012 from 100MHz to 500Mhz. After my initial joy :scared: I noticed something very odd:
The "zero line" (i.e. measuring ground) is out of alignment - it's always minus half-a-div for vertical divs >= 50mV. So:
* 10mV - OK
* 20mV - OK
* 50mV - minus 1/2 div, AVG is -25mV
* 100mV - minus 1/2 div, AVG is -50mV
* 200mV - minus 1/2 div, AVG is -100mV
* and so on...
I ran some checks and this happens for either 500MHz and 300MHz settings, with 300MHz being off minus 1 div instead. Kind of a deal breaker...
Does anyone have a clue what's going on? It happens regardless of input termination, AC/DC coupling (!), trigger settings, or probe attenuation and bandwith settings. I tried adjusting the "Offset" parameter of the probe, but that just shifts the phosphor line, the wrong voltage values remain.
Luckily I was able to downgrade back to 100MHz and everything is back to normal :phew:
--- End quote ---
would you mind saying which of the commands/methods you used for BW upgrade? also was your S/N >C020xxxx or <C020xxxx?
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