Well, I've gone on the Rigol-USA waiting list, hoping to nab a DSA815-TG in about two weeks when they expect a shipment to arrive from the factory. Right now everyone is sold out of the instrument!
Well, here's the response from Rigol on the DSA815:
See attached pdf from Rigol.
Looks pretty decent to me - what do the rest of you think?
Well, here's the response from Rigol on the DSA815:
See attached pdf from Rigol.
Looks pretty decent to me - what do the rest of you think?
The attached pdf shows the following (@ 750MHz)
RBW Noise
100Hz -94dBm
1K -82dBm
10K -73dBm
1M -54dBm
Allowing for the 10dBm input attenuation, these figures are around 10db lower than expected.
Stated specifications
0 dB RF Attenuation, RBW=VBW=100 Hz, Sample Detector, Trace Average ? 50
1MHz to 1.5GHz <-110 dBm+6 x (f/1GHz) dB, typical -115 dBm
Spec -110dBm + 6 x (.75/1.5 ) = -113dBm
Am I missing something?
Hi
Looking at PDF,Reference level is 0dBm
We have to consider,what if decreasing reference level?
I want to see the measurement result,like SSG -110dBm sinewave
reference level -60dBm
span 10kHz
other setting auto
Noise floor level is not flat anyway,so high frequency's DANL is getting worse,I think.
Soon somebody up the good info,but at the moment,only this site's measurement result 49.5MHz,-129.68dBm is predictable the performance a bit.
http://www.rigol.com/prodserv/DSA800/
Looking at this site,I decided to order DSA815-TG.
The setting of measuring 49.5MHz,-129.68dBm is
reference level -80dBm,average 3
span 5kHz
RBW 100Hz
VBW 1Hz
Sweep time 50s
Sweep time 50s is acceptable for me,merely to measure the small sinewave signal for me.
If VBW changes 10Hz,a bit noise floor raise,but it will be -130dBm like that.
Considering the price,I think it is not bad.
This example,Attn 0dB.
But,even if the internal attenuator is set up 10dB,almost noise floor is same,because the ordinary SA's IF amplifier automatically compensate it.
My R3361B can't set up 0dB attenuation actually.only from 10dB.
It is rather safe.
I don't know the difference of noise floor between peak-detector and sample detector,sorry.
I usually only use R3361B's normal detector,I think it is peak detector.
Even though R3361B is old one,but it has quasi-peak detector up to 3.6GHz,but
I am HAM,so I only use as my hobby experiment.
If DSA815-TG is no problem,I will release R3361B.It is too heavy.LOL
Now,I am waiting for DSA815-TG.
Everybody maybe notice that,TG level is only from -20dBm to 0dBm.
Usually TG level of SA is from-50dBm to 0dBm.
My concerns is rather Tracking generator's frequency accuracy,whether we can manually change TG's frequency to just center frequency,or TG's frequency is no problem,once calibrating.
Anyway,when I receive it,I will measure my homebrew 7MHz BPF(BW 100kHz,-6dB,insertion loss 5.5dB).
This BPF is already get the results,so I can check the performance of DSA815-TG.
Hi Dave - that's great news about getting (eventually) a DSA815 for review and teardown!
My DSA815-TG is supposed to ship today from Tequipment.net. They have stock and the item has been pulled from stock for shipping. Its ground - so I should have the unit by Tuesday or Wednesday next week!
Mine will take some time because they have to find a "spare" unit. I guess they can't just take one out of stock and ship it?
Anyway, they have promised that, and a DS4000 sig gen "mid to late May".
Then one of the new 2000 series scopes when they are available.
Dave.
Another nice thing I just wanted to point about about this thing which i hadn't realized at first, is that it includes a 1Hz resolution frequency counter functional up to its full bandwidth of 1.5GHz.
Lock the SA to a GPS reference using the 10MHz input and you have a very accurate frequency counter.
(The condition,when I checked the noise floor)
About demodulation function...
I tried to use it as FM radio with FM antenna,but I can't receive even the strongest signal station here.
Usually I can receive FM radio with R3361B,setting up RBW and VBW etc.
The sensitivity is quite bad,or my function is broken?LOL
Maybe some made-up FM strong modulated signals,like set up by DG4000 series something can be decoded,but as FM radio,it has problem,I think.
If anybody can receive FM station with FM ANT,plz let me know.
I don't know 3.0,but I am using VNWA2.6,and It can measure S21 etc,and of course,
connecting ANT,and it can calculate S11,and other directly put out VSWR etc info.
Now only complete one (not kit) is sold,so a bit expensive,but VNWA is also so educative.
it is worth to get it.
And maybe it is important for you and me...There is no PC software in the original CD.
I expected it has PC software...but no PC software.
I think,we can use Ultra Spectrum,but not sure.
(The condition,when I checked the noise floor)
frequency reference uncertainty = 1e-6 (it's brand new)
You can see the DSA815 is running 23.5 Hz (2.35 ppm) faster than the standard--very close to your observation, and slightly higher than the aging rate though no "factory calibration" specification is available, that I can find.