Mr Ted572, Thank you for your great great fix ... And Thanks to all the people who worked on this project.
I am sure it took many hard hours of work!!!
Well that is great news, congratulations. I will be going ahead also of course, but I have to wait a few days due to a family medical issue. In the meantime it would be nice to see your before/after spreadsheet data. It is encouraging to hear that you were able to successfully complete the process. Thank you for describing your method and offering to share your data with us.
...see the values that an Owner with a DG4162 can help as a base line values...
Well that is great news, congratulations. I will be going ahead also of course, but I have to wait a few days due to a family medical issue. In the meantime it would be nice to see your before/after spreadsheet data. It is encouraging to hear that you were able to successfully complete the process. Thank you for describing your method and offering to share your data with us.
Ted,
As promised, here's a plot of my pre-cal / post-cal (for Channel 1, Channel 2 is similar) after I hacked my DG4102 to a DG4202. As you can see, it looks DANG good after the cal.
Here's a little more description of the steps I did (I didn't do things in the cleanest way, but it gave good results, so...)
1) Set cal item to AC amplitude (all measurements here are at 1kHz if I recall correctly.)
2) Go through and record each voltage value (RMS) using DM3068 and DS2202 ("DS2302"). I set each value in the DG using the DM3068 measurement.
3) Fit a line through DS2302 vs DM3068 measurements (needed to do this so that I could correct my scope measurements since it had a small offset)
4) Save and set cal item to LF flat.
5) Set each point value to the measured value on the DM3068.
6) Save and set cal item to HF flat. (DG will automatically set output to 50-ohm for this cal item.)
7) Connect a 50-ohm through terminator to the scope.
Use the corrected RMS value from the DS2302 (using the relationship in step 3) and calculate dBm. dBm=10*LOG10(Vrms^2/(50*0.001)) Record this value into the DG for each point.
9) Save and enjoy flat response from DG.
The only problem I have is that I have quite a bit of drop off when I get to low frequencies, say at 1Hz and below. (Is this normal? - Probably not. I'm redoing my channel 2 to see if this problem exists on channel 2.)
EDIT: Added channel 2 plot. Again, below 10 Hz, I'm seeing rapid fall-off (maybe something wrong with my cal method.) At 1 Hz, I've got around -4 dB (the plots start at 10 Hz, so this isn't shown.) 10 Hz and above is very flat, though.
Thanks,
Clayton
...see the values that an Owner with a DG4162 can help as a base line values...I took the time to record the cal values in my DG4162 for the community effort and stuck them in an Excel 97 xls file. I recorded the values for CH1 first then started to do CH2 and realized they were all identical. I then did some spot checking of random values and couldn't find any differences between the 2 channels so I didn't spend the time to finish going thru all of CH2.
I also had a problem reading all the values for LOAD except the first (1-1). I kept getting a dialog box stating that I needed to remove the 50ohm load. Both channels were set internally to HI-Z and there were no loads connected to the generator. I was unable to select any other item under load apart from 1-1.
I also encountered odd behavior under HFLAT. When I initially started recording values, the units were in dBm. At some point I accidentally exited the cal procedure. When I re-entered it I got a warning dialog that the units were in mVrms . I power cycled the generator and re-entered the HFLAT cal table and it was back to dBm. I finished recording the dBm values, I jumped out and back in to trigger the mVrms values to record those. It turns out that they are identical to the dBm values ?? ?? ??
I hope this helps. If there is anything else I can do to help, feel free to ask.
Marc -
In the meantime it would be nice to see your before/after spreadsheet data. It is encouraging to hear that you were able to successfully complete the process. Thank you for describing your method and offering to share your data with us.
In the meantime it would be nice to see your before/after spreadsheet data. It is encouraging to hear that you were able to successfully complete the process. Thank you for describing your method and offering to share your data with us.
I'll clean up my spreadsheet sometime and upload it in the next day or so. You CAN calibrate the HF flat curve without having going through the AC amplitude and LF flat curve. You might want to start with HF flat and see if that flattens everything up on the high end while keeping your low end in tact. I may even restore my preset values and do the same.
I re-calibrated my LF flat curve very carefully and also did a calibration of the DC offset (very easy to do that one.) However, this didn't fix my drop-off below 10 Hz. The fact that I have the same thing for both channel 1 and 2 suggests that it wasn't just a silly error of entering a number incorrectly.
-Clayton
Clayton: How are you measuring below 10 Hz? Isn't that a little tricky, as in, don't you have to use DC coupling in your O'Scope to see it. And I don't think most DMM's will do very well at this low of a frequency. Excuse me, I'm sure you know all this, but just in case you forgot it. Ted
1ns TB, 200M BW Limit, and correct DS2302 Model type *yeah* ;-)
Orange noticed that the trigger is off by 3divs (lags behind) if u enable the 2nd channel - same happening, but only in 1ns mode.
maybe that is the reason why there is no official DS2302 version - anyhow i can live with that small limitation as it vanishes above 1ns TB
here is the version that will take care of model type string
http://www.filedropper.com/ds2302rilol
the "recalc" of the string is triggered by option un/install - so flush keys, and reapply them and it will become active.
did a selfcal on top of that - everything good.
In the meantime it would be nice to see your before/after spreadsheet data. It is encouraging to hear that you were able to successfully complete the process. Thank you for describing your method and offering to share your data with us.
I'll clean up my spreadsheet sometime and upload it in the next day or so. You CAN calibrate the HF flat curve without having going through the AC amplitude and LF flat curve. You might want to start with HF flat and see if that flattens everything up on the high end while keeping your low end in tact. I may even restore my preset values and do the same.
I re-calibrated my LF flat curve very carefully and also did a calibration of the DC offset (very easy to do that one.) However, this didn't fix my drop-off below 10 Hz. The fact that I have the same thing for both channel 1 and 2 suggests that it wasn't just a silly error of entering a number incorrectly.
-Clayton
I'll do the HFLAT cal. and post the results. Thank you for suggesting going ahead without doing AC and LFLAT.
Do you think there is anything to be gained by doing the AC and LFLAT calibrations, or do you think we can skip them without loosing something? Or is it too soon to know?
Ted
Well, the firmware also shows these strings:
CAN
LIN
USB
So, how can somebody enable CAN / LIN / USB protocol analyzer at a DS2072??
So DS2000 and DS2000A series are the same then, almost?, signature in the top are similar/same? DS2202
00.02.01.00.03...
from the file:
DS2072A
DS2102A
DS2202A
DS2302A
MSO2072A
MSO2102A
MSO2202A
MSO2302A
MSO2072
MSO2102
MSO2202
MSO2302
...
So maybe the DS2000 series can also be updated with the DS2000A firmware.
So maybe the DS2000 series can also be updated with the DS2000A firmware.
Is anyone going to risk the upgrade firmware on your DS2000 from DS2000A?
Is anyone going to risk the upgrade firmware on your DS2000 from DS2000A?
I'd give it a try - but am in the middle of a job and can't run even the small risk of down time on the DSO right now. Perhaps in another week or so.
Since even their dealers/service personnel might mistakenly use the wrong FW file at some point...
Is anyone going to risk the upgrade firmware on your DS2000 from DS2000A?
Someone had to try running the firmware Runs fine on my DS2202, but no CAN decoding showing in the options list unfortunately.
Someone had to try running the firmware Runs fine on my DS2202, but no CAN decoding showing in the options list unfortunately.