I have ordered a 1104X-E, hoping to get it next week. However, I have a question: This model has no real on/off switch, which I'm not a huge fan of. I guess it's because they want it to properly shut down every time (hence only a soft button), but an additional physical switch to remove power could still have been there. Just like the switch on a computer power supply.
So, what do you guys do? Leave it plugged in, or do you unplug it after use? Or do you add some external switch to cut power?
I have ordered a 1104X-E, hoping to get it next week. However, I have a question: This model has no real on/off switch, which I'm not a huge fan of. I guess it's because they want it to properly shut down every time (hence only a soft button), but an additional physical switch to remove power could still have been there. Just like the switch on a computer power supply.
So, what do you guys do? Leave it plugged in, or do you unplug it after use? Or do you add some external switch to cut power?Welcome to the forum.
You certainly can add an external switch but use scopes soft button to turn it OFF first.....it needs a second or two to shut down its OS correctly.
If I'm not at my bench using test equipment it's OFF at the wall.
And thanks for the welcome as well! I'm an electronics engineer that hasn't really done any electronics in a great many years, but suddenly I got the urge to order a new oscilloscope. My TDS210 still works, but the data record length is laughable by today's standards. And only 2 channels as well.
Follow up on the SAG1021
Also there is a 16 bit 1MHz Texas Instruments on the board that I cannot understand the purpose of, just generates a 7.5KHz square wave that drops off in amplitude when set to DC output.
Adding that to the frmware would clearly be possible, but Siglent probably doesn't care.
@Martin72: I've posted the question to the thread that Siglent support supposedly monitors.
But now I have a different question: On my brand new scope (SDS1104X-E) , if I short the probes and look at the measured DC voltage, it appears that especially on the 2V/div range there is a DC offset that is higher than I'd expect. On channel 1 for instance, it is around -125 mV, which I think is a bit too much. It is enough that you can clearly see that the trace is offset from the vertical position markers. The other channels are a little better, but all have a negative offset of more than 80 mV.
The other ranges seems to be a lot better, so why is the 2V/div range so "bad"? On my old Tek TDS210 I'm seeing around 15-20 mV (in this range), which is more in line with what I'd expect.
I've also tried running a self calibration, (which actually did improve the situation, because before doing that it was even worse). Am I just expecting too much here?
/ # uptime
01:12:12 up 1:12, 0 users, load average: 2.13, 1.53, 1.41
I've had it running for more than an hour now:Code: [Select]/ # uptime
01:12:12 up 1:12, 0 users, load average: 2.13, 1.53, 1.41
And I've ran the self calibration twice in the last 10 minutes. Seems to change a little between each run, but still quite a bit more offset than I'm happy with. The "Quick Cal" is on by default, and the scope came with the latest firmware (and it's hardware version 04). It was calibrated at the factory in December 2018.
After the last self calibration, it still shows an offset of around -120 mV, as can be seen here:
I'm using averaging (in the Acquire menu) to more cleanly show the offset here.
@tautech: My lab has a few cellular units running that can cause some EMI, but if that was it, shouldn't the other ranges be affected as well?
It seems only the 2V/div range has serious issues. I will however rerun the self cal in a different room and report back, as you requested.
And I've also re-run the self cal in a different room now, but nothing changed.
I guess that means the self calibration routine might not do a good enough job?