Hello Yves,
I was thinking the same that something is not right in the firmware.
I found the same thread on EEVblog late last night. For me it is more
work to be done since my 53181A and 53132A both have no option so I need
to maybe install the zero ohm R334 resistor and also the U14 socket.
When I will have time I will open my counters and check the motherboards
first.
Would be great news if you can confirm this info and the cloned 12.4GHz
work by default without any scale adjustment.
There is also an 18GHz version from the same seller on eBay and I wonder
that one how it would work since HP never had 18GHz version released.
They say you need the 3GHz option already installed and working and
after that you need to set scale to 4.0 to have the 18GHz option working
correctly. Maybe the hex values modification in firmware tells it what
divider or IF to use so maybe other values (or the same values as 12GHz)
will make it working fine without scale adjustment.
Thanks,
Razvan
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On 05/05/2024 23:32, Yves Tardif via groups.io wrote:
Hi Razvan,
I have option 124 on my hp53132A and it's a clone bought on eBay.
The scale used is 4, because by default, the internal divider is positioned
for a 030 or 3GHz option.
But I found on the EEVblog site, it seems to me, the following file
concerning the activation of the correct divider depending on the option.
I'll try this approach when I have some free time.
Yves
-----Message d'origine-----
De?: [email protected]
<[email protected]> De la part de Razvan Popescu via
groups.io
Envoyé?: 5 mai 2024 16:58
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] Another 3GHz 53132-68003 Chanel
3 option design for the 53131A and 53132A
Hello Ed,
I saw how the 3GHz board works regarding the divider but I didn't see any
original board more than 3GHz.
I didn't buy any cloned boards because I saw you need to use the math
function scale set to 4.0. I think they do divide by 128 also for the 12GHz
board but they should do probably divide by 512.
How is the original 12Ghz prescaler board working in regards to the divider?
I got the PCBs for the 3GHz version but I didn't order the parts to build
them. I will install the 3GHz prescaler first until I find a prescaler that
doesn't need the scale set to 4.
Razvan
On 04/05/2024 13:22, Ed (scskits) via groups.io wrote:
Razvan:
The 3GHz board is a divide by 128, with a max output of 23.4375MHz at
3GHz.
That has to get to the main board through the ribbon cable, not the
best way to connect.
At 12GHz the output would be almost 100MHz so I think that the higher
frequency option boards likely have an additional divider to keep the
output at a reasonable frequency.
There are two pins (CH3CODE0 and CH3CODE1) on the connector that are
used to tell the main board that one of the options is installed.
I would think that a combination of those pins would select one of the
three options or no option.
I will try to see what effect they have later this weekend.
ed
