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Aug 2018 in progress
It is necessary an ultra
low distortion sine generator like the
board with an harmonics typically about -150dB.
MEASURE OF DISTORTION
Measure the distortion with
very good resolution is not possible with normal audio card so the my choice is
the Olivine 2 an USB Analog To Digital Converter by
In order to purchase this USB ADC contact Alexander Torres by contact page.
Follows the measurement of the Victor ultra low distortion sine generator with Olivine 2 unsing Arta software, the result is very good 0.0003%.
To power the Victor 1kHz board I have used a LM317-LM337 module and a 18V-0-18V r-core transformer.
MEASURE OF FREQUENCY RESPONSE
To measure frequency spectrum I suggest an USB oscilloscope with minimun 12bit ADC and at least 1MHz band.
It s a portable lab with 12bit ADC and 12bit DAC designed for university students
Two general-purpose analog inputs:
Differential, ±25 V, 1 MΩ || 30 pF, 12-bit, 100 MSPS ADC with 25 MHz bandwid
Two general-purpose analog outputs:•Single-ended, ±5 V, 50 Ω, 12-bit, 150 MSPS DAC with 30 MHz bandwidth
Two variable power supplies•0 V to 5 V, –5 V to 0 V, 50 mA
16 digital input or output pins•3.3 V, 1.8 V, 100 MSPS, 5 V tolerant
Two digital triggers•3.3 V or 1.8 V, 100 MSPS, 5 V tolerant
The BNC adapter module for Analog Discovery could be used also for the ADALM2000 but I don't suggest to use it because it does not have differential analog (scope) inputs.
One input channel (1+) will be used as reference
and output is measured on the second channel (2+).
There are 2 software to use with this product:
In the webpage https://wiki.analog.com/university/tools/m2k/common/firmware you can find the procedure to upgrade the firmware to the last release.
In the webpage
https://wiki.analog.com/university/tools/m2k/scopy you will find 3 download
links for Scopy, one for the latest release, and two for the latest nightly
builds (one for 32-bit systems and one for 64-bit systems)
Select the second or third installer depending on your system, you should use the Scopy v1.1.1.
Here the frequency response of a pair of RC filter.
Here the frequency of the Gainclone amplifier using LM3875 chip using Scopy Network Analyzer with automatic voltage gain.
Here the frequency of the my PF2019 amplifier high voltage gain on 8ohm, output cap. 4700uF and driven by 6072 pre-ampl.
All tools can be detached by dragging them out of the left Tool Launcher onto the application or by double clicking the instruments if that setting is set in Preferences - https://wiki.analog.com/university/tools/m2k/scopy?s=detach#user_guides
VRMS is available in measurements -https://wiki.analog.com/university/tools/m2k/scopy/oscilloscope?s=measurements&s=scopy#using_built-in_signal_measurement_features
In order to create a final product to use I have put the ADALM2000 inside a chassie with standard connectors.
This is miniDSP UMIK-1 Omni-Directional USB Measurement Calibrated Microphone
Special features such as calibrated SPL measurement enabled under free Room EQ Wizard (REW) software
Frequency response: 20 Hz - 20kHz +/-1dB with calibration loaded
Resolution & Sample rate 24bit ADC @ 48kHz
Max SPL for 1% THD @ 1kHz 133dB SPL @ 0dB analog gain setting
USB Audio: USB Audio class 1.0 Driverless interface for Windows, Mac & Linux
Power USB Powered (5V) -Blue LED indicates unit under Power
All UMIK-1 are calibrated with a unique calibration
To have a fast integration with the calibration file I suggest to use the
REW is free room acoustics analysis software for measuring and analysing room and loudspeaker responses working on Windows, MacOS and Linux.
REW uses a logarithmically swept sine signal for its measurements instead of MLS so the room affects the measurement result if it is not produced in the near field.
Here follows the frequency responce of the Pioneer
PM16A1 with the 2nd and 3rd harmonic.