TNP #2 - Quick Repair of a Mechanically Damaged Agilent E3647A 60V Dual Channel DC Power Supply
12.1K views
November 22, 2020 1:04 AM
In this episode Shahriar looks at a defective Agilent E3647A 60V Dual Channel DC Power Supply. The unit has been damages due to a fall and has bent front-panel connectors. The teardown shows an EEPROM IC which has been dislodged from its socket. The front-panel connectors are re-shaped without any damage to the main PCB. The instrument functionality is verified using a DC Electronic Load.
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TSP #178 - Keysight MXR 8-Channel Real-Time Oscilloscope Review, Teardown & Experiments (Part 1)
31.4K views
November 1, 2020 9:47 PM
In this episode Shahriar reviews the long-awaited Keysight MXR-Series 8-Channel 6-GHz 16-GS/s Real-Time Oscilloscope:
https://www.keysight.com/en/pcx-3062392/infiniium-mxr-series-real-time-oscilloscopes
The Infiniium MXR-Series is the first oscilloscope to offer 6-GHz bandwidth and 16-GSa/s sample rate on every single one of its eight channels. It also offers excellent performance (ENOB up to 9.0, noise as low as 43 µVrms, dedicated ASICs) which exceeds that of the previous S-Series scopes. This review is organized as follows:
00:00 – Introductions
01:02 – Instrument overview, front-panel and rear interfaces
04:09 – Full acquisition board teardown and analysis including analog front-end
19:29 – First power-on and impressions
20:48 – Comparison and experiments with the Digital Sampling FFT, DDC and RTSA modes
34:04 – Time-base accuracy, frequency counter and DVM experiments
38:30 – Real-Time Eye, Jitter analysis and Equalization capabilities
50:00 – Concluding remarks
TSP #177 - Teardown, Repair & Experiments with an Agilent 86118A 70GHz Dual Remote Sampling Head
12.6K views
November 1, 2020 12:09 AM
In this episode Shahriar diagnoses a malfunctioning Agilent 86118A 70GHz Dual Remote Sampling Head. With 70GHz of analog bandwidth per channel, this module definitely deserves a repair. Unfortunately most failed remote-head modules aren’t repairable if the damage is in the sensitive proprietary III/V front-end IC. However, in this situation the module intermittently fails calibration which is more promising.
The teardown reveals the architecture of the module from the point of view of the analog and strobe paths. Measurements on the strobe path also show a potential failure on the power-amplifier/splitter network which feeds the two remote-heads. A pair of transistors are replaced on the strobe path which correct the problem. The unit passes calibration and is then used for various eye-diagram measurements to verify full functionality.
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TSP #176 - Teardown, Repair & Analysis of a Rohde & Schwarz AFQ100A I/Q (ARB) Modulation Generator
19.3K views
October 10, 2020 1:12 PM
In this episode Shahriar investigates a failed Rohde & Schwarz AFQ100A I/Q (ARB) Modulation Generator. This instrument provide differential I/Q outputs with exceptional SFDR which makes it ideal for various wireless system testing. The instrument shows a stand-by LED but does not power on.
The problem is tracked to the main power supply’s soft power-on circuit. After the repair of the power supply, it becomes clear that the main HDD is also defective. An identical donor drive is used to repair the broken HDD main controller board. A full teardown of the instrument is also presented. After the repair, the instrument is used to generate various arbitrary waveforms for performance verification.
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TSP #175 (II) - Teardown & Repair of a Fluke 744 Documenting Process Calibrator (Part 2)
15.6K views
September 20, 2020 9:09 PM
In this episode Shahriar return to the repair of the 744 Documenting Process Calibrator. A new firmware has been found and can be uploaded into the instrument. By forcing the processor into a bootloader mode, the firmware update can happen even if the original firmware is corrupted.
After the firmware fix, the instrument is tested for various functionality include DC/AC/I/Resistance calibration and measurement modes.
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