In this short episode Shahriar takes a close look at an HP 83475B Lightwave Communication Analyzer / Oscilloscope which offers a 500MHz bandwidth on both the electrical and optical inputs. The sub-sampling scope has a minor issue where the CRT brightness knob has been disconnected internally.
The teardown of the scope reveals the sub-sampling ADCs, O/E front-end as well as CRT driver circuitry. The operation of the scope is demonstrated using various electrical and optical NRZ and multi-level signals.
In this episode Shahriar reviews the Rohde & Schwarz 4.0GHz Spectrum Rider FPH. The new design of the FPH series is aimed for ease of use in outdoor situations as well as offering several software features for data collection, analysis and debugging of standard wireless communication protocols. The review is organized as follows:
1:10 – Model comparison of R&S portable spectrum analyzers.
5:44 – Instrument hardware overview and GUI characteristics.
22:24 – Using the FPH Spectrum Rider to analyze unknown wireless signals including a multi-tone, QPSK modulated signal, AM/FM demodulation analysis and frequency hopping.
46:46 – FPH teardown and analysis.
55:33 – Overview of the Instrument View remote connection software.
57:42 – Concluding remarks.
In this short episode Shahriar shows a few items to give away! Please leave a comment and a person at random will be chosen. There will also be a Q/A session sometime in the future, please also leave your questions in the comment section.
The winners of the draw will be notified at a later date.
In this short episode Shahriar investigates the failure cause of a Keithley 2400 SMU. The unit powers on and responds to controls however produces no output signal. Further examination reveals that the VFD display shows no activity when the output is enabled; normally the measured output voltage and current are displayed. This failure points to a digital problem, potentially a failure in the analog board FPGA.
Upon close inspection the FPGA clocking circuitry appears to have a failed solder-joint. A quick re-flow of the affected part corrects the problem and the unit reports the appropriate readings. The unit is then upgraded to the latest firmware and calibrated using a Keithley 7510 DMM.
In this episode Shahriar reviews the long awaited Keysight MXA Signal Analyzer (N9020B). The new X-Series Spectrum Analyzers from Keysight offer an entirely re-designed GUI interface which supports multiple tabs as well as multi-touch interaction. The review is organized as follows:
1:07 – Model comparison and overview of x-series spectrum analyzers.
7:08 – Instrument physical overview.
11:49 – New GUI overview and demonstrations.
22:44 – Instrument block diagrams and analysis.
28:46 – Brief look inside the MXA spectrum analyzer.
32:53 – Back-scattering communication experiment block diagram and description.
37:16 – Phase noise characterization of doubler and amplifier.
51:54 – Complete back-scattering experiment measurements and analysis.
1:04:45 – Analysis of broadband modulated signals by using the S-Series scope and MXA Signal analyzer at the same time.
1:13:56 – Concluding remarks.
The Signal Path (TSP) is an electrical engineering video blog for industry professionals, students and hobbyists. TSP is a non-for-profit website dedicated to provide free education spanning a wide range of electrical engineering topics. Equipment reviews, tutorials and repair videos are posted regularly.