Hello,
Also I expect that the range would be somewhat limited by the unit
software, since the control word is 32-bit, same as the DDS program word
with, and I don't think that the little thing would enable to program
the DDS from zero to 32-bit. In any case, my idea was first to only
monitor the DDS word (at serial port) and serial port offset message
limits, and also to test in that way the lock range of the 5680A - this
can be a bit tedious since when I programmed a 10Hz offset, the unit
unlocked ant took several seconds to lock again.
Regards,
Javier
El 29/01/2012 21:41, Bob Camp escribió:
Hi
If you try to do full scale, check the range of your VCXO first. The digital
test is much easier if you already know where your VCXO stops tuning.
Bob
On Jan 29, 2012, at 1:45 PM, Javier Herrero<jherr...@hvsistemas.es> wrote:
I'm now gathering the unit self-updating of DDS data, that will take somewhat
long... so I will try later or tomorrow. Since we have seen that the DDS values
are reported back in a response to a command, it is easy to do without the need
to have anything hooked to the SPI bus :)
Regards,
Javier
El 29/01/2012 19:37, Scott Newell escribió:
At 05:45 AM 1/29/2012, Javier Herrero wrote:
For example, the following data has been gathered:
Serial offset 00 00 00 00
DDS A word: 44 02 62 F6 = 1141007094 = 5 313 228.32219 Hz
DDS B word: 43 FD CC 8E = 1140706446 = 5 311 828.32085 Hz
Can you do a test at +/- fullscale offset as well?
This is a very exciting discovery. Nice work!
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Javier Herrero
Chief Technology Officer EMAIL: jherr...@hvsistemas.com
HV Sistemas S.L. PHONE: +34 949 336 806
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19170 El Casar - Guadalajara - Spain WEB: http://www.hvsistemas.com
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