In this episode Shahriar repairs an Agilent E5071C ENA Vector Network Analyzer generously loaned by AllTest. Please visit their website for all your measurement, calibration and service needs: sales@alltest.net https://alltestchambers.net https://alltest.net The network analyzer is missing the main HDD which initially prevents it from being tested. An image from a donor E5701C instrument is used to boot the unit and gain access to the instrument firmware. The unit shows an inaccurate S11 with an open Port 1 while S22 shows a perfect reflection. This indicates a potential problem with the Port 1 T/R module. Teardown of the module reveals catastrophic damage to the resistive front-end coupler which has been mostly likely caused by a large RF input power incident. After cleaning the PCB area, a replacement coupler is constructed. The repaired unit is checked for full self-test and used to measure a YIG tuneable filter. You can may check the Andostar microscope lineup here: (Direct Link / Not-tracked) https://www.aliexpress.com/store/900802?spm=a2g0o.detail.100005.2.4d4f407ekYxi5H More information about Wheatstone Bridge: https://www.mwrf.com/technologies/test-measurement/article/21849280/the-wheatstone-bridge-how-does-it-impact-vna-measurements www.TheSignalPath.com www.YouTube.com/TheSignalPath www.Patreon.com/TheSignalPath ... https://www.youtube.com/watch?v=sWoVjxtQ54s

In this episode Shahriar reviews the Analog Discovery Pro 3000 Series, particular the ADP3450 model. The instrument offers a combination of mixed signal oscilloscope and dual-channel arbitrary waveform generator. The WaveForms free software can be used to perform a wide range of measurements. You can find more information about this product at: https://digilent.com/shop/analog-discovery-pro-3000-series-portable-high-resolution-mixed-signal-oscilloscopes/ The review is organized at follows: 00:00 - Introductions 00:35 - Instrument overview, functions, specifications and design 04:53 - Detailed teardown and architecture overview 11:17 - WaveForms software, oscilloscope capabilities, catching glitches, trigger functions 19:18 - Mixed-Signal measurements, logic analyzer, cross-domain triggering 22:19 - Serial decode, digital trigger, correlated measurements 24:03 - Waveform generation, synchronized signals, modulations, sweeps, FFT, 3D spectrogram 28:46 - Network analyzer functionality, measuring linearity and frequency response of DUT 33:42 - Impedance analyzer functionality, measuring complex impedance across frequency 36:29 - Additional capabilities, tracer, scripting, etc. 37:39 - Concluding remarks ... https://www.youtube.com/watch?v=ryxxYGmRCpQ

In this episode Shahriar returns to the microscope LED upgrade challenge. The highest light density LED is used as a point source to improve Kohler illumination. Both transmission & reflected light sources are upgraded while maintaining the control purely through the microscope controls. The LED used can be found here: https://www.digikey.com/en/products/detail/new-energy/XHP70B-00-0000-0D0BP250E-SB01/7428211 Several images are also presented using bright field, dark field as well as polarization manipulation. www.TheSignalPath.com www.YouTube.com/TheSignalPath​​​ www.Patreon.com/TheSignalPath ... https://www.youtube.com/watch?v=IflO2RB-TKM

In this episode Shahriar reviews the Rohde & Shwarz RTB2004 10-Bit oscilloscope. With its high-resolution touch-screen, intuitive and capable GUI as well as excellent analog/digital performance this scope competes very well against other 2000 series instruments from Tektronix and Keysight. This extensive review includes instrument teardown, overview and dedicated experiments as follows: 01:17 – Model comparison and R&S scope lineup. 02:20 – Front panel, rear panel and overview. 05:01 – Instrument teardown and analysis. 13:37 – Power on and basic functions including intensity grading, XY mode. 26:29 – Multi-tone behavior, FFT and ADC performance. 33:17 – Experiment with ambient light follower: Analog and RS232 digital serial capture, triggering and analysis. 48:03 – Experiment with external DAC: Analog and I2C data capture and search using remote web interface. 57:19 – Built-in arbitrary waveform generator behavior and performance. The Signal Path www.TheSignalPath.com www.YouTube.com/TheSignalPath www.Patreon.com/TheSignalPath ... https://www.youtube.com/watch?v=YokF2_EbfIk