Title: Aplitude and clock sync issue [Print this page] Author: ewaldo Time: 2019-1-18 08:44 Title: Aplitude and clock sync issue I recently purchased an HDG2002b and have two significant problems. The first thing I did is upgrade to the latest firmware.
First, the amplitude and offset voltages are off by 2. If I set the amplitude from +1V/-1V, it's actually .5V/-.5V, likewise 6V/-6V gives me 3V/-3V. The offset is the same. If I give a +1V offset it's offset by .5V, +2V offset measures +1V offset. I would guess that this is a software bug in the firmware.
Second I am attempting to synchronize to a highly stable Trimble Thunderbolt 10Mhz GPSDO external clock source and there is a significant difference in frequency deviation and phase. The sync is so bad that the internal clock source provides a much better match to my other synchronized equipment than when I attempt to use the external clock source. Once thing I noticed is that the 10 Mhz external clock outputs a 10 Mhz square clock. The Trimble Thunderbolt produces a 10 Mhz sine wave. Should I able to use a 10 Mhz sine wave external clock or does it require a square wave clock?
Thank you for any information you can provide. If it sounds like my hardware is acting abnormal,
Author: amy Time: 2019-1-18 10:52
Sir, please give me the firmware version of your unit.
And about your problem, please take a video and send to me to study. Author: ewaldo Time: 2019-1-21 03:22
I found a calibration procedure and everything looks a lot better from a voltage perspective. The external clock sync still isn't working. I read somewhere that it might require a signal larger than +20dBm. Can you confirm whether or not this will take a regular sine wave clock input and how large the signal needs to be? Author: amy Time: 2019-1-21 14:42
ewaldo replied at 2019-1-21 03:22
I found a calibration procedure and everything looks a lot better from a voltage perspective. The e ...
You need to input a square with frequency 10MHz and voltage 0~3.3V to 10MHz In/Out connector. Author: ewaldo Time: 2019-1-21 22:36
Thank you very much. This would be very useful information to add to the manual. Author: ewaldo Time: 2019-1-28 02:30
I completely forgot to ask. What should be the impedance level of the external 10 Mhz clock in? 50Ohm?
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