Category Archives: The Signal Path

Teardown, Repair & Upgrade of an Agilent 3458A 8.5 Digit Digital Multimeter

In this episode Shahriar repairs and upgrades an Agilent 3458A 8.5 Digit Multimeter. The instrument has been kindly donated by AllTest Instruments Inc. You can access their website here (http://www.alltest.net) , as well as their eBay store (
stores.ebay.com/expresstestservices) , Bonanza store (http://www.bonanza.com/booths/Alltest_Instruments) and TestUnlimited Continue reading Teardown, Repair & Upgrade of an Agilent 3458A 8.5 Digit Digital Multimeter

TSP #121 – Rohde & Schwarz FPC1500 5kHz – 3GHz Spectrum Analyzer Review, Teardown & Experiments

In this episode Shahriar reviews the newly released FPC1500 Spectrum Analyzer from Rohde & Schwarz. With this addition Rohde & Schwarz continues to aggressively target the entry level market across a wide range of instruments. These units are packed with competitive features some of which are not found in other instruments in Continue reading TSP #121 – Rohde & Schwarz FPC1500 5kHz – 3GHz Spectrum Analyzer Review, Teardown & Experiments

TSP #119 – R&S RTB2004 Giveaway, Q/A, Patreon & Other Discussions (December 2017)

In this episode Shahriar reveals the winner of the R&S scope giveaway. Congratulations Samuel Edmunds for winning the R&S RTB2004 oscilloscope! Other topics such as broken equipment purchases, Patreon goals and rewards are also discussed.

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TSP #96 – Dino-Lite USB Digital Microscopes Review and Experiments (2017 Edition)

In this episode Shahriar demonstrates a series of new Dino-Lite USB Digital Microscopes released in 2017. Several models are shown:

AM7515MT8A – This unit offers 700X-950X magnification with built in coaxial lighting as we as switchable bright-field and dark-field lighting options.

AM73915MZT – USB 3.0 interface with one touch auto-focus, EDOF & AMR. The Continue reading TSP #96 – Dino-Lite USB Digital Microscopes Review and Experiments (2017 Edition)

TSP #95 – Teardown, Repair & Analysis of an Agilent E4443A 3Hz – 6.7GHz PSA Series Spectrum Analyzer

In this episode Shahriar repairs an Agilent PSA Series Spectrum Analyzer. The instrument generates many errors during self-alignment and produces no measurements below 3.2GHz. The block diagram of the unit is thoroughly presented and various possible failure points are considered. Based on the observation of the noise floor, the most Continue reading TSP #95 – Teardown, Repair & Analysis of an Agilent E4443A 3Hz – 6.7GHz PSA Series Spectrum Analyzer