| Products > Test Equipment |
| REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol |
| << < (526/566) > >> |
| Teneyes:
--- Quote from: NikWing on December 02, 2014, 07:59:21 pm ---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 --- End quote --- @Nikwing Please show your display. Here are some displays of multiply 2 signals 1,2 Multiply using Ax B math 3,4 multiply using Advanced math CH1 x Ch2 5 Shows the Math does not change with different V/div Scale (green is reference before change) Note: The Math uses the instantaneous values , to get RMS add the calculation in the equation What FW version is your DSO? |
| NikWing:
Teneyes, thanks for your reply! I have to take the screenshots tomorrow, DSO is at work firmware is 03_00_01_03 I think, that's the file I currently have on my HDD, I think I've seen a newer firmware while browsing this thread yesterday, but had no time to update yet so I have to go to advanced math and enter some formula? I'm not sure about the settings on the yokogawa (it displays Vrms, Irms and W/math(1x2)rms on screen), but the on the philips I just went to the math menu, enabled it and selected ch1xch2, both show the same result, just the Rigol shows something else but well, more details tomorrow :) |
| Teneyes:
RMS of [ Sin (ch1) x sin(Ch2 - pi/2) ] Note , using HiRes Same for FW 00.02.00.01.03, Fw 00.03.00.01.03, and FW 00.03.01.00.04 |
| Teneyes:
Just multiplying positive and negative values |
| NikWing:
ok, so here it is: 2 screenshots, one from the Yokogawa and the other is from the Rigol. What I've noticed: if I set math to Ch1xCh2, the displayed value (shows 604W) is a little higher than the value it shows when I set advanced math and enter Ch1 * Ch2 (shows around 596W) The Yokogawa and Philips both show around 550W Looks like I can't set something like RMS(CH1) * RMS(CH2) in advanced math. My problem is, I have to adjust and measure the power of a ballast and I want to achieve the same "accuracy" I have with my workplace DSO (the value is important for a customer) edit: btw, setting para.save, footer/header on or off has no effect here :o |
| Navigation |
| Message Index |
| Next page |
| Previous page |