Products > Test Equipment
EIP 545B Frenquency counter
Guile:
--- Quote from: HighPrecision on May 13, 2018, 10:01:37 am ---
--- Quote from: Guile on May 12, 2018, 10:27:00 pm ---I've had a look at EIP 575 Service Manual and found Error 40 code means DAC table Error.
--- End quote ---
"DAC Table Error" is apparently an access problem to calibration data stored in A105 EEPROM, Error 32 is also suspicious related. Check all power supply voltages on main board, not directly on power supply board, often there are problem on connectors contacts to board edges.
Also check for possible data/address BUS overloads from PIA chips (68B21).
--- Quote ---Thus, if this Service Manual can be used for my 545B I'll be able to repair it. At least I have to dig a bit more onto A107 board now.
--- End quote ---
Yes, this manual is usable.
--- End quote ---
Hi HighPrecision,
I've not been able to find anything wrong so far. Thus I did like Douardda and I've made a Dump of the EEPROM (from address 0x0800 to 0x0FFF) which took me around 20 minutes to download all the 2048 words thanks to his idea. Then I've had a look at data from 0x0C00 and they don't look right. At least up to 1Ghz (0x01F4) the data look ok but above I'm not sure:
0x0C00, 0x00
0x0C01, 0x08
0x0C02, 0x00
0x0C03, 0x00
0x0C04, 0x01
0x0C05, 0x2C
0x0C06, 0x01
0x0C07, 0x28
0x0C08, 0x01
0x0C09, 0xF4
0x0C0A, 0x01
0x0C0B, 0xF3
0x0C0C, 0x0C
0x0C0D, 0xB2
0x0C0E, 0x0C
0x0C0F, 0xD5
0x0C10, 0xFF
0x0C11, 0xFF
0x0C12, 0xFF
0x0C13, 0xFF
Indeed, if I've understood correctly the data I've dumped, the DAC is tuned at 600Mhz, 1Ghz, and 6.5Ghz, which looks weird and not in line with the Service Manual which is asking for 1Ghz, 1.3Ghz, 10Ghz and 20Ghz. Still it doesn't explain why my counter is not able to count above 1Ghz anymore as it should have done interpolation at least up to 6.5Ghz...
Any thoughts?
Thanks a lot!
HighPrecision:
Hi Guile,
DAC Table is clearly incomplete, looks as a aborted TEST 90 calibration process, missing the DEF-2 bytes before 'Table End'.
If you have the required generator do a complete recalibration via TEST 90 as described on 575B manual, at 20 GHz point there is an error, with generator @ 20GHz the frequency inserted is 18 GHz, that is wrong, must be the same frequency of the generator.
If you are unable to do the complete calibration, try to modify EEPROM locations from 0x0C10 as:
3F FF 3F FF FF FF FF FF
Also the 600MHz is not a standard cal point for plain 545B without special options.
Ash:
Sorry, I'm a bit late to this party.
I've got an EIP 575 which I'm planning to implement the power meter on, I've all the parts, just no time.. sigh.. :palm:
I thought for future reference I'd add a link to the python script I wrote to use the TEST 10 process over GPIB to read out EPROMs. I was verifying my images matches the "Rev D" set available online. This can be adapted to read out what ever memory range you want.
https://github.com/AshleyRoll/GBIPLogger/blob/master/eip575_memory_reader.py
Note that I'm using a Prologix Etherent GPIB device, but you can modify the code or add drivers as needed to my hacked up code :) DM me if you need help.
Hope it helps someone.
Ash.
Guile:
--- Quote from: HighPrecision on May 17, 2018, 08:29:29 am ---Hi Guile,
DAC Table is clearly incomplete, looks as a aborted TEST 90 calibration process, missing the DEF-2 bytes before 'Table End'.
If you have the required generator do a complete recalibration via TEST 90 as described on 575B manual, at 20 GHz point there is an error, with generator @ 20GHz the frequency inserted is 18 GHz, that is wrong, must be the same frequency of the generator.
If you are unable to do the complete calibration, try to modify EEPROM locations from 0x0C10 as:
3F FF 3F FF FF FF FF FF
Also the 600MHz is not a standard cal point for plain 545B without special options.
--- End quote ---
Thanks a lot HighPrecision, your tricks worked!! Error 40 is gone and I can hear the tick tick tick of the Band 3 assembly again!! Unfortunately the only source I have goes up to 8Ghz (which is ironic as I've retuned its YTO thanks to my EIP...).
I don't know what has gone wrong as the protection switch was in the protected position (it tooks me a while to understand why I had Error 20 when trying to access to Test 10). Thus I'm affraid that something went wrong and that the whole EEPROM, or a big chunk of it has been erased... I'll try to recalibrate it up to 8Ghz and I'll see if I can rent a 20Ghz source later.
Also I've never tried to run Test 90, but now I know how to proceed.
Thanks again :-+
Guile:
--- Quote from: Ash on May 17, 2018, 11:36:25 am ---Sorry, I'm a bit late to this party.
I've got an EIP 575 which I'm planning to implement the power meter on, I've all the parts, just no time.. sigh.. :palm:
I thought for future reference I'd add a link to the python script I wrote to use the TEST 10 process over GPIB to read out EPROMs. I was verifying my images matches the "Rev D" set available online. This can be adapted to read out what ever memory range you want.
https://github.com/AshleyRoll/GBIPLogger/blob/master/eip575_memory_reader.py
Note that I'm using a Prologix Etherent GPIB device, but you can modify the code or add drivers as needed to my hacked up code :) DM me if you need help.
Hope it helps someone.
Ash.
--- End quote ---
Thanks for proposing your help Ash, but I've also developed similar script to dump my EEPROM. However if you can share with me your EEPROM content (from 0x0800 to 0x0FFF) I'll be very grateful!!
Now I need to recalibrate my counter again but I'm still interested with activating the Power Meter. Let's try together if you agree :)
Cheers
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