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Camarillo

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  1. Hi, just got back from the lab and I think i don´t understand this that well...... This is the actual 100uS signal that I want to measure. Please note that the amplitude is 20 mV/div. The signal should be around 55 or 57 mV. The frequency of such signal is 25 Hz (with a pulse width of 100uS). This is a closer look at the signal. Please note the change in the peak values. The normal signal hovers around 60 mV, and now the AD2 shows peaks of 100 mV. Still, the width is still around 100uS and the plateau is near that 60 mV value. If I try to measure the signal for a longer time, the voltage is not what is suppose to be. Please note the value drop to about 10 mV instead of the 60 mV. This is the same 100uS width at around 60 mV pulse as the first image. The actual signal that I want to measure is 10 seconds long (looks like the next one). Since I want to incorporate the AD2 in LabVIEW with another sensor, I first want to know if the AD2 can measure the actual voltaje. Maybe my measuring skills are wrong and I need to go back to school. Can you provide some insight @attilain this regard? Thanks a lot. PS: I found this post but still can´t get the grasp on the concept:
  2. Thanks @attila, will test this later at the lab. If I want to record the signal for 5 minutes, should I use the record option or the log option? I´m doing measurements with Labview and will incorporate the AD2 to measure this signal. Will post the result later this day. Thanks again.
  3. Hello. First some context: I´m doing a measurement of a signal that has a 10 second period. It is comprised of several 100 us signals, all in that period. Such signal has a maximum 50 mV amplitude. This might be a very basic question but I´ll ask it anyway: If I zoom in to the 100us signal, I can see the correct amplitude. If I zoom out such as to capture the 10 second period, the amplitude decreases drastically (about 75% of the original value). Is there something that I´m doing wrong? Thanks in advance.
  4. Two more things: I will now just measure +-40 volts. Can I use the differential measurement for that (Channel 1 and 2). Will try to revive the waveform generator in the near future. I think #1 is a given since here: and here: https://reference.digilentinc.com/test-and-measurement/analog-discovery-2/reference-manual?redirect=1#scope_input_divider_and_gain_selection states that the maximum input can be +-50 volts using differential measurement. Thanks in advance... and sorry for the super late reply.
  5. It appears I can´t post more pictures. I can´t delete the ones in the post above (don´t know how). Well, just to your point, it probably was that faulty switch that caused all of this.
  6. Hello again. Almost a year and a half later. After reparing the oscilloscope (with your help, of course), I did use it for some other low level measurements and the digital side as well. Had to do some other measurements and was surprised by something: One of my probes has a faulty switch for the x1 and x10 range. I started using a bench oscilloscope and that is where i found out. This is odd since they were bought with the BNC PCB for the AD2.
  7. Hi again...... I think I broke it for sure now. This image is with the wave generator #1 with its output at 5 volts with no offset. After resoldering the ADG612, Channel two was able to mirror the information in channel one. Here are both channels at the same time. It´s strange because Channel one was not failing. Maybe it´s because my soldering skills with SMD is not that good. I just soldered the IC. Maybe I broke it for sure now. Did a device calibration setup and the first two steps generate -5.05 volts. (it says demo mode but the measurements were made before disconnecting the device) Right now I don´t have access to my AD1. Next week I´ll have access to it and will use it as a reference to measure analog signals. Can you provide some insight? Thanks.
  8. At the time of your response, I was looking at this other of your responses: Was looking for those resistors IDs in the reference document to determine which one was Channel 2. Thanks, I´ll now proceed to operate ?
  9. Hello. Thanks for the info. Just one question, and this might be very transparent for everyone but me: Which of the two ADG612 is the channel 2? I have all the intention to do that repair in this week. Good thing I have the AD1 for testing.
  10. Thanks for the reply. Did the factory reset but the measurementes were the same. Although something happended that I did not notice: if I start channel 2 with the 500mV/Div, if i change it to 5V/Div, the signal from channel 2 goes to -3V and after a few seconds, it goes to +21 (with nothing conected to the probes). Did a calibration after loading the factory data. The waveform channel, both 1 and 2 passed. But the oscilloscope did not, and it showed the behaviour described above (-2.7 volts to +21 volts. Do you think it might be the MUX ADG612? Thanks.
  11. Oh.... sorry, did not understad that. Did the measurements. They are within range: VREF2V = 0V VOFF_SC2 with 0V offset = 1.94V, VOFF_SC2 with 2.5V offset = 2.99V VOFF_SC2 with -2.5V offset = 1.01V All measurementes respecto to the device´s ground and with 500mV/Div for channel 2.
  12. @JColvin Thanks. Mr Attila is helping me out with my issue in another thread.
  13. I´m sorry with all those uploads. Don´t know what I did but apparently I uploaded all the files again. The last two measurements: This one is the +2.5 Offset at VOFF. I had to modify the range from 0.5 to 1 volt/div. It measures 2 volts. This one is the NET409_1 with +2.5 volts offset. I left the same 1 volt/div as the other one. It measures 0.5959 volts. What do you think? Could the MUX be the problem? Thank you so very much.
  14. Hello Mr Attila. I think I did the measurements but not sure if I did them in the right manner. My setup: -OSC1 ----> GND +OSC1 ----> to test points Did all measurements with respect to GND of the AD2. In the last measurement I remembered that it also could have been differential measurements. Did all the differential measurements and the result is the same with the other two with respect to GND of the AD2. I had to modify the +2.5 offset with 0.5 scale because the measurement will not show it self (higher than 0 volts I guess). This was the VREF_SC2, with respect to GND it was close to 2 volts. This one is the NETC410_1 with respect to GND. It was 1.1947v This one is the diferential measurement, just took it after I´ve finished... This one is the VOFF with 0 volts offset. It was almost 2 volts (1.9969) This one is NET409_1 with 0 volts Offset respect to GND. It was 0.5855 volts. This one is VOFF with -2.5 volts offset and 0.5 volts/div. It measures 1.99 volts. This one is NETC409_1 with -2.5 volts offset with 0.5 volts/div. It measures 0.5786 volts.
  15. Sorry, forgot to add the MHz part. Edit: can´t upload the other picture. EDIT: I was able to upload the picture but as a PDF.
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