Yeah, just see the blatant ripoff of the Agilent multimeter copied by Siglent
I had just opened up my new SDG2042X to see if it would be possible to give it isolated outputs (with a little add-on board containing the data isolators and a DC/DC converter).
I had just opened up my new SDG2042X to see if it would be possible to give it isolated outputs (with a little add-on board containing the data isolators and a DC/DC converter).
Any news? This seems like an interesting little project...
Are you aware the SDG5000 series offers isolated outputs as standard spec?
I had just opened up my new SDG2042X to see if it would be possible to give it isolated outputs (with a little add-on board containing the data isolators and a DC/DC converter).
Any news? This seems like an interesting little project...Are you aware the SDG5000 series offers isolated outputs as standard spec?
Reactance with 50Hz is around 1ohm
One thing i'm missing from the SDG2042 is the ability to add noise to the generated waveform, ie sine+noise, pulse+noise....
One thing i'm missing from the SDG2042 is the ability to add noise to the generated waveform, ie sine+noise, pulse+noise....
BTW heres the spectrum of the white noise coming out of the generator, 130mV stddev over 50ohms, 120Mhz bandwidth :
QuoteReactance with 50Hz is around 1ohmReally? How can that be with a 3 uF capacitance to ground? And where is the component that causes that?
I bet there's some capacitive coupling from the mains to the output in the power supply via the transformer and the EMI suppression cap. Or your TVS diode may be shot.
Just found a SW bug regarding the modulation with noise:
1) Set carrier, eg 40MHz
2) turn on AM modulation, 100% depth, sine wave, set AM frequency to x Mhz (I used x=1, but tested others too)
At this point the correct AM modulated waveform is generated
3) Change modulation "shape" to noise
instead of noise being modulated, an infinite number of sub-carriers spaced x Mhz apart are generated
@rf-loop: no offense meant, I just reacted to your post before you corrected your typo. 1k Ohms perfectly adds up with the 3 uF you mentioned. I hope we can agree that if the impedance to ground really were 1 Ohm, then something would be seriously knackered.
@everyone interested: The reason why Siglent chose the rather large capacitance between output ground and chassis for the SDG5000 lies in the EMI suppression scheme they chose for the power supply. There is a little 2.2 nF suppression cap next to the transformer, that is connected between the output common and the primary circuit's negative rail. This negative rail bounces up and down at roughly one half mains voltage (so in my case 325 V P-P), and if nothing is done to suppress that, that voltage will end up superimposed on the output voltage. Very high-Z though, but enough to give you a slight tingle and to damage electronics. When you draw that away with 3 uF to chassis it drops to some 80 mV RMS, low enough so that nobody will be bothered.
The SDG2000X power supply is almost identical to that of the SDG5000, and it has the same EMI suppression scheme. So I can choose to go for an isolation solution like the SDG5000 and accept 3 uF between output ground and chassis, or I can try to tackle the PSU as well, and aim for something in the 10 nF range, which a good bit more useful. But as rf-loop rightfully concluded, 3 uF output-to-ground capacity is still a lot better than no isolation. So I suppose this is one of the reasons why you pay top dollar for a Hagsight generator.
Just found a SW bug regarding the modulation with noise:
1) Set carrier, eg 40MHz
2) turn on AM modulation, 100% depth, sine wave, set AM frequency to x Mhz (I used x=1, but tested others too)
At this point the correct AM modulated waveform is generated
3) Change modulation "shape" to noise
instead of noise being modulated, an infinite number of sub-carriers spaced x Mhz apart are generatedCan I ask, which model? 40, 80 or 120 MHz unit.
Edit.
Got a PM from MasterTech and his is a improved SDG2042X. <wink>
We'll attempt to replicate this bug with a new unit and if proven will be notified to Siglent next week.
Just found a SW bug regarding the modulation with noise:
1) Set carrier, eg 40MHz
2) turn on AM modulation, 100% depth, sine wave, set AM frequency to x Mhz (I used x=1, but tested others too)
At this point the correct AM modulated waveform is generated
3) Change modulation "shape" to noise
instead of noise being modulated, an infinite number of sub-carriers spaced x Mhz apart are generatedCan I ask, which model? 40, 80 or 120 MHz unit.
Edit.
Got a PM from MasterTech and his is a improved SDG2042X. <wink>
We'll attempt to replicate this bug with a new unit and if proven will be notified to Siglent next week.Following on from the bug MasterTech revealed above....
Is a Noise type of modulation even required?
Why? Real use example please.
Do other AWG's provide Noise modulation of waveforms?
Makes? Models?
Just found a SW bug regarding the modulation with noise:
1) Set carrier, eg 40MHz
2) turn on AM modulation, 100% depth, sine wave, set AM frequency to x Mhz (I used x=1, but tested others too)
At this point the correct AM modulated waveform is generated
3) Change modulation "shape" to noise
instead of noise being modulated, an infinite number of sub-carriers spaced x Mhz apart are generatedCan I ask, which model? 40, 80 or 120 MHz unit.
Edit.
Got a PM from MasterTech and his is a improved SDG2042X. <wink>
We'll attempt to replicate this bug with a new unit and if proven will be notified to Siglent next week.Following on from the bug MasterTech revealed above....
Is a Noise type of modulation even required?
Why? Real use example please.
Do other AWG's provide Noise modulation of waveforms?
Makes? Models?
It actually doesn't make any sense, if I were Siglent I'd remove that option in the modulation menus. They are looking for trouble by doing it this way.
However, adding noise to other waveforms (ie sine+noise, pulse+noise, etc...) is very useful, as it lets you mimic real life conditions at the input of devices like logic gates, drivers, demodulators..... That feature should be added in my humble opinion.
Guide for Dummies
1. Plug in ethernet cable and turn on unit
2. Press Utility -> Page 1/2 -> Interface -> LAN Setup -> DHCP ON
3. On you computer telnet (Windows use Putty, OS X and Linux can just use telnet on the CLI) to the IP Address that's displayed. (If you need to manually specify the port it's 23)
4. mount -o remount,rw ubi2_0 /usr/bin/siglent/firmdata0
5. cp /usr/bin/siglent/firmdata0/NSP_system_info.xml /usr/bin/siglent/firmdata0/NSP_system_info.xml.orig
6. vi /usr/bin/siglent/firmdata0/NSP_system_info.xml
7. Use the down arrow to navigate to the line which has '<license><bandwidth_update_license>xxxx</bandwidth_update_license></license>'
8. Press dd to delete the line. Press ESC. Type :wq then hit enter (write quit)
9. Turn unit off and on again