My time of late has been taken up with some time consuming projects which should have been completed a while ago, buts that's life
Rigol RSA update time, a while back I stripped out the power supply on the MSO 8000 and introduced some quality components into the design, now that had a nice positive effect on the scope, more of that in an upcoming post.
That got me in the mood to, "don't use use it, liberate the casings' I believe is a well known phrase in these parts
So I proceeded to do the same to the RSA Tv84 enhanced unit, well struth Bruce if they aren't the same cheap arsed power supply
.
If you own any of the the following models they all have the same SMPS RSA3000/5000 and the MSO/DSO 7000/8000.
Tv84 has been slaving away with his necromancer like abilities with coding to try and get to the bottom of the 3.2Ghz floor limit even after his opening up spell has been cast.
I believe he now has the information he requires to demystify the current impasse that has plagued users on this forum from being able to use the full bandwidth on an opened up RSA 3000 upwards (not E models).
So without further ado please find below a series of base line noise floor screen images from a genuine fully used RSA5065 running the latest firmware, no options activated on this unit so just the basic 25Mhz real time BW
The second set of identical freqency readings are from the code fettled wondrous world of the Mage of deep SCPI extraction plus a little open frame surgery from this humble Metcal twirler.
Both Real time analysers had been running for a solid two hours and the temp in the lab yesterday was a very pleasant 24C.
First is a straight sweep at full BW of 6.5Ghz, then 100Khz, 10Khz and lastly 3Khz (and that took a wee while
) All the sweeps has the 'Accy' function selected, this is a posh button on the RSA that means I believe translates to 'averaging'
Then the same frequency sweeps conducted with the Pre Amp activated.
You will be able to see for yourselves the power supply improvements have paid off nicely a good -2 to -3dbm drop in noise floor generally, after 4Ghz in some places up to -7dBm resulting in a much more fluid and straighter trace line.
So around three hours of time, £48 worth of quality components has proved rather beneficial.
Have some more updates this time on a DG822 but that is for the other thread on Rigol function generators.
I believe next week an ester egg will be popping up for the RSA3000/5000 models (not sure about the E version yet) suffice to say it will be most pleasing.
The next post will have the pre amplifier enabled images