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Found 5 results

  1. One USB-TC can be mounted 8 thermocouples. I had mounted 8 T-thermocouple on the MC USB-TC. We know that when we start to use the T-thermocouples and USB-TC to measure the temperature, we have to calibrate the system(thermocouples + USB-TC) firstly. During the calibration, we use calibration bath to calibrate thermocouple, which filled with water. Question 1: Can I calibrate the 8 thermocouples in one time? And the thermocouples could be put in water directly or thermocouples shall be put in a bag which avoid run current between the thermocouples in water(that can have impact on the measurement). Question 2: I put the 8 thermocouples and one standard PT100 in water. The calibration bath was set at 31℃ and the PT100 showed the temperature was 31.1℃. However the 8 channels of USB-TC showed different values. Showed as attached photos, compare the value measured by PT100 and thermocouples, the max different was about 0.52℃. It was quite big. Why some thermocouples looks quite different with correct value?
  2. Hello, I have an Analog Discovery 2 that has had an issue on Channel 2 of its oscilloscope for a few months now. Essentially, the channel measures around -25 V at all times, whether it is floating, grounded, shorted, connected to the BNC adapter board, etc. I have not used it in any high-voltage applications or scenarios. I have attempted to manually recalibrate the oscilloscope, but I get an error when I do so telling me the voltage on Channel 2 is between -2.7418 and -2.7412 V but it should be around 0 V. I've attached a screenshot of this error below. Note that I did calibrate the Wavegen 1 offset as suggested but that did not fix the issue. I've also tried loading the factory calibration, which seemed to load successfully but didn't resolve the issue. When I measure the DC voltage on 2+ pin on the AD2 I see it's around -4.8 V, whereas the 1+, 1- and 2- pins all read around 0 V. I'm happy to probe around more to help debug, but for now I'm not too sure where to start. Thanks, K
  3. I am a hobbyist, new to oscilloscopes. I recently purchased the Analog Discovery 2, the BNC Adapter and the BNC Oscilloscope 1X/10X Probe pair. I've read this post and this post, and followed this video on calibration, but, I'm not sure the AD2 and/or the probes are measuring properly or not. I cannot get square off the signals. The screenshots indicate the maximum I am able to deflect the signal when rotating the screw within the probes. From my understanding, rotating the screws in the probes should make the signals become square. Here's other information which may be indiscernible in the attachments, which may or may not be relevant (cuz I'm a noob). Both probes have the 1X/10X switch set to 10X The probes are both clipped to the W1 pin on the BNC Adapter board Both probes have their ground clip connected to one (and the same) of the flywire ground pins Both probes are set to DC Coupling on the adapter board JP4 and JP5 on the adapter board are set to 50 Ohm, though I don't think that matters because I'm not actually using the Waveform connectors on the adapter board In the screenshots, the channels are configured for "Attenuation: 1X" within the Waveforms software, but, a similar non-squareness occurs when set to "10 X" I'm using Waveforms 3.12.2 64-bit Qt5.6.3 on Ubuntu 18.04.4 The AD2 is connected to a USB3 port, directly attached to the computer (no USB hub) Any advice and/or guidance would be greatly appreciated, especially considering I may have missed something that would be obvious to an advanced user.
  4. Dear All, I am confused about the calibration process of PModIA module with Arduino board. I am using a program from Github, please check that. Also tell me the use of SEL pin in the board. Can you please tell me step by step procedure... ad5933-test.ino
  5. Documents for the DMM Shield states an accuracy of +-0.1% for voltage, current, and resistance except for specific ranges highlighted. Is this accuracy obtained with factory calibration only OR does the user need to also need to calibrate the equipment? If the user needs to calibrate, can the calibration factors be stored and used by Shield OR is a external program required to make adjustment in real time. At the moment, the Shield fails to produce comparable measurement with a Fluke 88V that has lower accuracy for current and resistance readings. For the voltage readings, the accuracies are comparable but the Shields gives a poor reading based on calculated values vs measured.
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