I guess we're still using this thread to comment on and possibly offer feedback to the functionality of the FY6600 and FY6800 units?
I've been playing around with my new FY6800 (thanks to precaud!) and it seems to be able to be coerced into doing everything the manual says; bottom line, it's a great value and will get a lot of use on my bench. But the frequency units display is rather tedious to decode while trying to quickly enter values. I was trying to generate an AM modulated signal and it took a couple of tries to get carrier and modulation frequencies which were appropriate to generate the display I was looking for because I was trying to parse uHz on one channel and MHz on the other during the setting procedure.
It seems that the units suffix (Hz, MHz, etc.) is usually updated to a more sensible value after you complete entering the frequency and hit OK. That's good, and desirable; although I've been able to trick it into displaying 100 KHz as either 0.1 MHz or 100000000 uHz depending on the order in which I entered the data and hit OK. That's not so good, and could be improved if FeelTech is interested.
What would make sense to me would be if, as you selected the appropriate frequency digit to change, the unit suffix were to change color, or blink, or something, and indicate the range of the decade you were manipulating. Ex: as you moved into the digit group setting kHz it could blink "kHz", and if you moved past that into the group covering Hz it could blink "Hz" and then return to a steady indication of the appropriate units after you hit OK and the software was able to determine the value of the highest digit. As it stands, you could be looking at something silly like "uHz" even while you're in the process of setting 10 MHz, or "MHz" while you're trying to set a frequency of 10 Hz. More mental effort required on what should be a simple setting.
It's kind of like my soldering stations - I have one which is fixed to display in F and another which is only in C. I can do the math in my head while setting values, but it's something which could be made a little easier for the user. It would be easier still for the FY6800 user if the software dynamically shifted the frequency display left or right and calculated units as you set the digits, but that would take considerably more effort for the coder to implement - I've done such in the past, so I have a hint of the effort.
I don't know if FeelTech would consider a similar change for future revisions, but I think it would substantially improve the usability of what is already a superb value in test equipment.