Hello,
today my Rohde & Schwarz ADS Dual Arbitrary Function Generator arrived. Packaging was so lala, the generator was fully wrapped with 3 layers of thin bubble wrap. This was putted in a huge sturdy box with lots of this paper wool all around so it couldn't move.
I powered it on first, because I was curious about its functionality.
This is it in action:
All the knobs and the wheel are working well, the BNC connectors are looking good. Nice detail: there is a very fine mesh over the VFD's to prevent any RF leakage.
I did some testing. First, I was interested in how the sine is looking in the frequency area (FFT). The ADS can do a max. sine frequency of 5 MHz. I set the output to 1V
p-p and then I found out, that I don't have any decent 50 Ohms BNC terminators.
(The plan was to visit this year the HAM Radio in Friedrichshafen to get some, but ...) Will try to find some in the bay, together with some T-adapters.
This is the result for 5MHz, on the left is Ch1, on the right Ch2:
I had the impression that Ch2 is slightly better than Ch1.
The second test was feeding Ch1 and Ch2 into the scope and run it in XY mode to check the phase coupling between both channels.
This is the result for a sine wave, 1.6V
p-p at 500kHz and +90° for Ch2. Looking good. Amplitudes are okay, too.
Then I increased the frequency to 5MHz and now we can see a little divergence in the phase. The generator is still saying +90° but the XY plot disagrees. I've reduced then the phase to 87° and voilà, a perfect circle. I have to check the data sheet if this is okay or not. I think it is not.
On the left it is set to 90°, on the right to 87°.
And here just for fun I did a XY plot with the triangle function. Not really convinced about the linearity.
Settings: 500kHz, 1.6V
p-p, Ch2 +90°
Teardown will follow, stay tuned.
Edit: typos