Products > Test Equipment
DG4000 - a firmware investigation
ted572:
DG4000 Calibration Restoration:
I just finished calibrating my DG4000 for Channel 1 and 2, and the frequency response is flat up to 200 MHz and well within better than +/- 0.8 dB.
So what is calibration? I have concluded that it is removing the un-calibration that you end up with after you install the firmware patch to extend the frequency!
So to calibrate (or rather restore the previous calibration of) your DG4000: Press - Utility, Test/Cal, Secure Code, (put in PW) 2010, Enter, Secure OFF, (the result should be) Secure ON, Access gained.
Then for Cal. select HFLAT, Call Point (start at HFLAT 1-1), Measure Value, Input Value, press Save and wait for it to complete (about 3 seconds), select Cal Point for the next step. Repeat for all 60 steps. Then your done and you didn't have to connect anything up to your DG4000, except for AC power. Hi
Repeat for the remaining channel (only if you find it necessary, but I don't think that it will be).
Cheers, Ted
Rufus:
--- Quote from: ted572 on December 06, 2013, 05:47:35 pm ---Then for Cal. select HFLAT, Call Point (start at HFLAT 1-1), Measure Value, Input Value, press Save and wait for it to complete (about 3 seconds), select Cal Point for the next step. Repeat for all 60 steps. Then your done and you didn't have to connect anything up to your DG4000, except for AC power. Hi
--- End quote ---
That isn't making any sense to me. What does "Measure Value, Input Value" mean?
If you can calibrate without connecting anything but mains why can't the thing self calibrate with one button?
ted572:
--- Quote from: Rufus on December 06, 2013, 06:30:55 pm ---
--- Quote from: ted572 on December 06, 2013, 05:47:35 pm ---Then for Cal. select HFLAT, Call Point (start at HFLAT 1-1), Measure Value, Input Value, press Save and wait for it to complete (about 3 seconds), select Cal Point for the next step. Repeat for all 60 steps. Then your done and you didn't have to connect anything up to your DG4000, except for AC power. Hi
--- End quote ---
That isn't making any sense to me. What does "Measure Value, Input Value" mean?
If you can calibrate without connecting anything but mains why can't the thing self calibrate with one button?
--- End quote ---
Measure Value : Shows the current value (although apparently it may not be fully active) and outputs its frequency and level for you to measure.
Input Value: : Allows you can enter your new measurement value (from the Measure Value step above).
I don't how this fixes the issue with frequency response, just that it brings it all back to life, by Restoring the Original Calibration. Running the Factory Restore by itself won't do it.
Don't bother to measure or change anything. Its not required or necessary.
Just follow the steps I provided to activate the current values that were somehow unactivated from the GEL patch.
If you have already changed some values, then I would exit and restore the Factory Defaults and then repeat the procedure I provided. But, of course that's your option.
I'm of course starting to wonder if perhaps the same thing should possibly be done for AV, LFLAT, but certainly nothing else. Although I'm not going to go there at this time unless we spot a potential issue.
And by the way my frequency response up to 200 MHz looks to be +/- 0.5 dB or better so far.
Note: Do the guys here with DG4000 FW 00.01.07.00.03 and the 'ppulse and npulse' issues have this patch installed, if so, could they be getting another artifact that could be related? I don't know, but they may want to consider the possibility.
Ted
Rufus:
--- Quote from: ted572 on December 06, 2013, 07:40:11 pm ---I don't know why this fixes the issue with frequency response, just that it brings it all back to life. The Factory Restore by itself won't do it either.
--- End quote ---
Calling it calibration is what made it confusing since you are not calibrating, just going through some motions which appears to re-instate an existing calibration.
ted572:
--- Quote from: Rufus on December 06, 2013, 07:47:35 pm ---
--- Quote from: ted572 on December 06, 2013, 07:40:11 pm ---I don't know why this fixes the issue with frequency response, just that it brings it all back to life. The Factory Restore by itself won't do it either.
--- End quote ---
Calling it calibration is what made it confusing since you are not calibrating, just going through some motions which appears to re-instate an existing calibration.
--- End quote ---
Yes, we are Restoring the Original Calibration. And you are correct, the description was incorrect, but then this is a new revelation of what is going on in the DG4000.
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