In this episode Shahriar reviews the Keysight FieldFox Microwave Analyzer which is capable of both 2-port network analysis as well as spectrum analyzer with real-time capabilities. Keysight's FieldFox portable analyzers are equipped to handle tough working environments during routine maintenance, in-depth troubleshooting, and anything in between:

https://www.keysight.com/us/en/products/network-analyzers/fieldfox-handheld-rf-microwave-analyzers.html

This review is organized as follows:

00:00 – Introductions.
01:22 – Instrument overview, design, interfaces, built quality.
04:38 – LCD screen, remote interface, GUI usage.
05:04 – S-Parameter personality, calibration, tuner experiment, reflection phase shifter measurements, etc.
15:35 – Power Sensor personality, PA load-pull experiment, reflection power measurements.
21:12 – Spectrum analyzer personality overview, built-in synthesizer, output spectrum quality.
24:42 – mm-Wave transmitter measurement, detecting impairments, spectrum analyzer capabilities.
29:00 – I/Q analyzer personality, RF envelope versus time capabilities.
31:33 – Real-time spectrum analyzer personality, 100% POI performance.
33:23 – PathWave VSA compatibility, mm-wave constellation demodulation example.
36:32 – Noise Figure personality, Friis equation demonstration, NF uncertainty calculator.
46:50 – Concluding remarks.

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In this episode Shahriar takes a look at the a battery-based spot welder which have become fairly popular recently. Due to being mass-produced, some poor corner-cutting schemes can render these devices dangerous. The teardown of a random unit is presented. After improving the safety of the unit, a sample weld is done. The maximum deliverable energy of the unit is also measured.

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In this episode Shahriar repairs an OPTOELECTRONICS APS-104 tunable band-pass filter. The instrument provides continuous tuning from 20MHz to 1GHz with a constant 4-MHz band pass response. Since the repair proves to be fairly easy, the video focuses on comparison between various band-pass filter architectures. This includes microwave cavity filters, PCB-based filters with varactor tuning, YIG filters and frequency-translation filters. A range of measurements highlight the differences and pros/cons of the aforementioned filters. The APS-104 unit is fully reverse engineered and characterized as well.

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In this episode Shahriar repairs a Keithley 2001 7.5 Digit multimeter. This is a very high performance unit and worth repairing. However, the early 90's revision of these units were subject to electrolytic capacitor failure all overt the analog and digital boards. The failed capacitors destroy the nearby traces including the inner layer connections. The teardown of the unit reveals this problem. By using x-ray imaging the missing and damaged traces are identified and meticulously repaired. Several of the power supply diodes were also destroyed. The repaired unit passes all self-tests as well as measured V/I/R in both DC and AC correctly. The unit is compared with measurements reported by a Keithley DMM7510.

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In this episode Shahriar repairs a Fluke 345 Digital Power Quality Clamp Meter. The Fluke 345 is more than an electric power meter. Combining the functions of a clamp meter, oscilloscope, data logger and digital power meter into one handy device, the Fluke 345 is ideal for working with variable frequency motor drives, high efficiency lighting and other loads using switching electronics.

Although the repair ends up being fairly simple, we get some insight into some of the user interface circuitry as well as some experiments showing the capabilities of the unit.

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