Hi,
can somebody help me calibrate my scope infiniium 54825A?
I have the following problem:
After builtin calibration is used everithing seems fine.
After power off on cycle It appears the calibration values are lost.
What could be my problem?
can somebody help me calibrate my scope infiniium 54825A?
I have the following problem:
After builtin calibration is used everithing seems fine.
After power off on cycle It appears the calibration values are lost.
What could be my problem?
thanks for the advice, but it is not that.
My conclusions are that since there are errors on one of the channels the calibration data are not hard written.
So maybe may question is how can I calibrate the other channels then. (And calibration stays).
Are you referring to the self calibration under the Utility calibration menu? That is what your description sounded like. You say that the self cal passes and all works fines. But when you cycle power on the scope, the self cal file is lost and the scope powers up saying calibration required. Is that true? If yes, then you probably have a HD issue. Most of the self cal uses DC levels. The AUX output connects to a 32bit DAC which is programmed to output specific dc voltages. The scope is only 8bits, so the 32bit DAC is more accurate. The scope measures the dc votlage values at each volt/div setting and impedance setting. The scope compares what dc voltage the DAC was programmed to and creates a software correction table. When you make measurements with the scope, the software correction table is used to correct for votlage errors in the scope system. The performace tests in the service manuals just use a dc power supply and voltmeter to make sure that the scope is measuring correctly. If the 32 bit DAC is bad, the performance tests will pick that up and fail. The self cal goes through all four channels and basically creates a software correction table for each channel and each volt/div setting. After the self cal is complete, the values are written to the HD on the cal folder (hidden fold). When the scope powers up it makes sure that the cal file is correct for the scope. It makes sure that the model number matches the cal file and compares the checksum to the cal file. If any of those do not match, the cal file is not used and you get the message saying scope needs calibrated. For some reason, the scope cannot read the cal file from the HD. There could be a corrupt sector where the file is being stored. Run disk check on the HD. Press Control Escapte on the keyboard which will bring up the Windowd start button. Run disk check to see if anything shows up as an error. The next step would be to reimage the HD. Did you try running the self tests in the Utility menu to make sure there are no errors on the acquisiton board. The self tests check more things than the self cal. The self cal just checks the DC measurement path and basic triggering. If the self cal is not your issue, then I totally misunderstood what cal you are thinking of.
You are right, it was an HD fault.
I have another question. Since I have reseted the NVRAM, the relays' counters are lost. Can you help me reset them.
Thanks.
http://www.home.agilent.com/agilent/edi ... 4:epsg:man
Page 6-29 had the procedure to reset the attenuator contacts. You can reset them to any value you wish. The value doe snot matter as long as it is not in the millions. You can use 0 or 1000, or any number you wish.
The procedure is clear, but I don't know how to enable the "AttenSet" in the self test menu. I think it has something to do with poin N3 in the procedure "Put Service Disk in the flopy..." Any idea what's on this disk?
WARNING! Before changing anything regarding the scope's software and OS, it may be very valuable, having a complete image containing the original hard disk content. I used Acronis TrueImage to create such an image from the scope's hard disk, which was connected to my PC via an IDE to USB adapter.
Back to enabling "AttenSet":
1. First you have to leave the running scope application:
If you see the scope application's main menu, you may use "ALT-F4" to terminate this application.
Or use the task manager (ALT-CTRL-DEL) to kill the scope's application task.
2. Start the loader with the option "service" - "c:\scope\hp548ldr.exe /service"
3. From the scope application main menu select "Utilities"-->"Self Test"
4. Select the now available "AttenSet" from the "Self Test" - combo box and click the "Start Test" button.
5. Now you may change the actuation counts.
Some other "discoveries" - more options of the loader:
The loader recognizes also the option "/internal". Run:
"c:\scope\hp548ldr.exe /internal"
and you will find the new menu item "Internal" at the end of the "Utilities" menu.
If you enhance the scope using a SSD oder FlashModule instead of the hard disk, the ramdrive (d:) is not longer needed. Following my experinence, the scope application will start faster from the SSD compared to the time needed for copying files to the ramdrive and starting them from this location.
To relinquish using the ramdrive, use the loader option "/noram":
"c:\scope\hp548ldr.exe /noram"
"c:\scope\hp548ldr.exe /noram /service"
"c:\scope\hp548ldr.exe /noram /internal"
To save some boot time and also about 16 MByte main memory for the not longer needed ramdrive, i deleted file "c:\config.sys". My "c:\config.sys" contained only two lines, one to load "himem.sys" and one to load "ramdrive.sys". If your "c:\config.sys" contains more lines, you should better remove only the "ramdrive.sys" entry from this file.
If you run the loader ("c:\scope\hp548ldr.exe") without the "/noram" option, the loader automatically rewrites the file "c:\config.sys" to create the "himem" and "ramdrive" entries and automatically restarts windows.
http://tech.groups.yahoo.com/group/hp_a ... sage/27635
If not, here's the re-post from the Yahoo group on some more easter eggs induced from different command line switches:
-----------------------------------BEGIN REPOST-------------------------------------------
A month or so ago I was looking (and offering a reward) for a 54845-68803 or sub
part 54810-68760 service disk for the Infiniium 548XX scopes. Since I was unable
to find one and Agilent no longer had them, I ended up paying a software
programmer to disassemble the source code of the executable located in the
\scope\bin folder (this folder may be hidden; you will need to use windows
explorer to show hidden and read-only files) The information he found allowed me
to not only reset the attenuator contacts, but to open up some service level
diagnostics only available to HP technicians. Don't know if these may help
anyone but here's the info:
Make a .bat file with the following in the C:\scope\bin folder with these
command line switches:
For scopes that use the hp5481X.exe executable:
hp5481X.exe scope /scope /hpib /service (for service mode)
hp5481X.exe scope /scope /hpib /internal (for some very interesting stuff
including some funny easter eggs!)
For scopes that use the hp5484x.exe executable:
hp5484X scope /scope /hpib /service
hp5484x scope /scope /hpib /internal
Other valid command switches (I have not tried these yet)
/two
/color_knobs
/plain_knobs
/windisp
/newfeatures
/olddisp
Have fun!
Jay
----------------------------------------END REPOST-------------------------------------------
Jay