I can't find any release notes so I have no idea whether there's a significant difference between the versions. I looked through all the photos I could find as well as ebay listings. On ebay there were a couple of units that had V1.04, but most didn't have a photo of that info.
I'm working through a couple of minor quirks with my unit and wondered whether they're fixed in a newer version. I have the probably unreasonable expectation that a synthesized function generator should be able to output the frequency that you key in with a tolerance comparable to the unit's resolution. I realize that where DDS is involved, things can get 'interesting'.
First, I set the output for 1 Hz and sync both my counter (Fluke PM6681) and the DS345 from my Rubidium house standard (HP 5065A). Then, I measure the period of the sync output and get a standard deviation in the range of 100 us. (which is also 100 uHz). But, the DS345 claims to have a resolution of 1 uHz. Seems a little silly to claim a resolution that's buried under noise that's 100 times larger! I'm still exploring that to see if there are some bad components that need replacing.
But I figured out how to use the arb capability to bypass the analog processing on both the main and sync outputs and access the digital core. Now, when I look at the sync output, the standard deviation of the period is a more reasonable 37 ps., an improvement of about 2.5e6 times (!!) and is stable from test to test. Unfortunately, there's a tiny period error in the range of 50 ns.
Yes, it's tiny. No, it won't bother 99.999% of the users. I'm a time-nut and we love to obsess over these things!
This is the kind of thing that a firmware upgrade might affect.
Lowimpedance: That's the same fan as mine. The closest datasheet I could find is for a 109P0624H602 which is 24V@0.07A, 14.8 cfm, 31 dBA, 4200 RPM.
Ed
P.S. Don't forget to go to their web site (
www.thinksrs.com ) and get their AWC software to create arbitrary waveforms.