as the most essential as well as the most vulnerable part of electrical scales low sales proper functioning has a lot to do with the accuracy of wayment in this video we'll be showing you a simple way to test your low cell quickly and easily before starting the test make sure to have the specific low cell calibration certificate of which you are going to pay attention to the wiring diagram with cable color codes the output impedance and input impedance and anything else that's necessary for your testing purposes after each test remember to compare the measurement values with the calibration certificate from the manufacturer to see if they closely match each other then let's get started with the test set up the multimetering arms and measure the resistance across the input and apple lace of the low cell to be more specific signal wires at the output and excitation wires are the input as shown in the schematic the digital multimeter is connected between the positive signal wire and the negative signal wire of the low cell in our case they're the green and white leads will have the red probe placed onto the green wire and black Pro placed onto the white wire if the low cells in good condition the output between them should be equal to the values specified in the spec sheet so the resistance should be close to 350 ohms and we get a reading of 353 ohms that's fairly close enough this is the test for low cell output resistance now check the input resistance between the positive excitation wire which is read for this model and the negative excitation wire which is black the measurement we've got should be equal to the specified value in the calibration certificate so it should read 435 ohms or so and the meter registers 439.7 which is quite close enough this is the test for input resistance similarly check the low cell for accuracy by measuring the millivolt signal from the input leads to test the lobster accuracy you'll need a multimeter and a voltage source in this case we'll use a low cell controller as the external power supply to provide excitation voltage to the low cell and this controller is driven by 220 volts ac source since the lowest I was working fine we're going to supply 10 volts DC excitation voltage across the input leads [Music] plug the controller into the AC source and now let's measure the millivolt signal across the signal wires namely the gray and white wires and we've got the Middleburg reading if you look at the calibration certificate with no Force applied to the low cell the value should be zero foreign [Music] apply a calibrated that weight as specified in calibration certificate and compare the values again if the output voltage match the specified value then the low sounds good that wraps it up for the video to learn more about low cell testing please visit our website if you're looking for budget-friendly low sales the purchase link has been posted in the description section below go ahead and do your shopping from there thanks for being here to next video take care and goodbye