I've got a question: how good is the math function of the DS2xxx?
I try to measure current, voltage and multiply both to see the power
on all 3 DSOs all channels and math are set to RMS.
But only the Rigol shows a 10-20W different calculated value
the math also changes with V/div resolution on the Rigol, that doesn't happen on the other 2 DSOs
The Yokogawa and Philips both show around 550W
Looks like I can't set something like RMS(CH1) * RMS(CH2) in advanced math.
is it normal that my Rigol measures a higher value than my other DSOs? and is there a way to calibrate it to show the correct value instead of using corrections in math?
if I may ask that: saving s png screenshot with header, footer and (I currently don't remember the word) the text file enabled doesn't work here. the png looks the same all the time and no txt file is being created. Is that a bug?
is it normal that my Rigol measures a higher value than my other DSOs? and is there a way to calibrate it to show the correct value instead of using corrections in math?I am not sure.
Have you preformed the Rigol 'Selfcal" recently
and I push the stop button, I see multiple lines on screen until I change the time base (and back to where it was)
is that a bug?
and I add another question about triggering:
I've attached a random picture. Usually I would trigger at A
is it possible to trigger at B although there's a higher peak in the signal? Is it possible to tell the scope to always trigger at a desirered point on the curve?
Would I set the trigger level to let's say B and then use delay/offset or nth recurrence, or is there another way?
And, would it be possible to analyze just the part I marked with C, as in pretending that this is the real signal (which kinda "repeats" between B and A)?
I don't know how to phrase that D:
I have found a bug related to switching between roll and YT mode in the newest firmware. Here is the description:NOT a Bug, but you found the Limits of the Specifications
the 1st two displays show no error at 18mv, Roll to YT ( noise)
As you can see there is No error in the Scale
Now read the Specification in next Pix
because you are using 10x your input is 1.8mV, which is below Spec.
Pix 5 & 6 confirm your displays with 10X
( I think I saw this and reported it to Rigol as the DSO is still triggering , but they responded that the input is out of Spec)
I hope that Helps
Teneyes: This also looks like a Bug to me. Please, why would Trigger level effect the vertical display/measurement when switching from 'ROLL' to 'Y-T' Mode?
I find the very osbcure small bug of 1/2 scaling occurs
Teneyes: This also looks like a Bug to me. Please, why would Trigger level effect the vertical display/measurement when switching from 'ROLL' to 'Y-T' Mode?
CORRECTION , Yes a rare bug
Thanks Ted, I removed any Trigger level causes by using External Trigger (5 V sync pulse)
Also set the input Scaling to 1x
Used a 2 cycle burst to set roll and trigger time
I find the bug of 1/2 scaling occurs for this Setup
1. Lowest V/Div scale (500uV/div @ 1X, 5mV/div @ 10X..... )
2. After Switching from Roll to Y-T
The scale is corrected after:
1 The scale is clicked lower (still the Same 500uV/div)
2 The vertical position is changed
3. The vertical position is Zeroed
4. The trigger position is Changed or Zeroed
5. Chan 2 ( even Off) position is Zeroed
I hope that would help Rigol narrow the code that needs to be called when switching to Y-T mode
The 3 Displays with 3.6mV,
Roll mode
Y-T mode
Y-T mode after a knob click
Edit: I have reported this to Rigol , anyone with D2000A , wish to confirm This bug
Edit: Occurs when Chan 1 only is on
Frequency counter?
(Latest jitter fix firmware. Im not sure if it behaved the same way with the "older")