Thank you 1audio for indicating the place of documentation. However, I am still looking for a complete schemes. Partly on the forum I found schemes and downloaded them. You never know when they will be useful ;-)
Has anyone performed the full calibration of the meter after repair? Is this possible without having patterns, calibrators and all this expensive equipment or immediately send to the company to carry it out?
Has anyone performed the full calibration of the meter after repair? Is this possible without having patterns, calibrators and all this expensive equipment or immediately send to the company to carry it out?
I'm confused by your description, The instrument is strictly mono- it can only test one channel at a time. The outputs on the back are differential- so they can drive a differential input but are not separate left and right. Further if you try you may end up with cancellation of the output.
You cannot calibrate a 6 1/2 digit instrument without the necessary exotic calibration equipment. However those instruments hold calibration quite well. If you do not see any obvious issues with bad readings I would just leave it as is and just use it.
You cannot calibrate a 6 1/2 digit instrument without the necessary exotic calibration equipment. However those instruments hold calibration quite well. If you do not see any obvious issues with bad readings I would just leave it as is and just use it.
Maybe I did not write about this in the previous message, but as you can see in the diagram I use two Keithley devices. One to the left channel and the other to the right channel. Thanks to this, I can constantly compare harmonic distortions in two channels. I can also change the amplitude and read the level of harmonic inspections for set voltage levels. Having a connected oscilloscope I see two channels of their amplitude, I can measure it in RMS. On the oscilloscope I also see whether the channels work symmetrically and linearly and whether there are harmonic distortions of the signal that the Keithley devices measure. In an oscilloscope I can also use FFT measurement to verify the results of Keithley measurements.
As for the calibration of instruments, I asked purely theoretically. I asked about your experience in this topic. Has anyone ordered it and what is the cost of it. I myself have no objections to Keithley measures because they indicate correctly (maintaining the correct connections and control).
I verify the Keithley devices by their mutual switch (channel replace) and data comparison on the display. In addition, I can conduct a FFT analysis on an oscilloscope for each channel. I also use an external sound card (Roland-EDIROL) and software Right Mark Audio Analyzer and Spectra Plus for measuring harmonic, non-linear and noise (and much more).
This is how it looks. So more or less like in the diagram ;-)
As for the calibration of instruments, I asked purely theoretically. I asked about your experience in this topic. Has anyone ordered it and what is the cost of it. I myself have no objections to Keithley measures because they indicate correctly (maintaining the correct connections and control).
I verify the Keithley devices by their mutual switch (channel replace) and data comparison on the display. In addition, I can conduct a FFT analysis on an oscilloscope for each channel. I also use an external sound card (Roland-EDIROL) and software Right Mark Audio Analyzer and Spectra Plus for measuring harmonic, non-linear and noise (and much more).
This is how it looks. So more or less like in the diagram ;-)