TSP #223 - Tektronix THDP0100 ±6kV High Voltage Differential Probe Teardown, Repair & Analysis
18.3K views
March 6, 2023 1:20 AM
In this episode Shahriar repairs another high-voltage Tektronix probe, this time a THDP0100 which is capable of measuring 6kV signals up to 100MHz. The probe does not get detected by the scope. However, it soon becomes clear that the problem with this probe is much more involved than the previous repair.
The probe has a short-circuit inside the probe body as well as several damaged components. Each is replaced one step at a time until a final fault is also detected in the probe head. After the repair, the probe is zeroed, calibrated and used to measure a signal at 6kVpp using an Associated Research HYPOT tester.
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TSP #222 - Fluke 5450A Precision Resistance Calibrator (1-Ohm - 100-MOhm) Teardown & Repair
26.8K views
February 12, 2023 12:33 AM
In this episode Shahriar takes a look at a non-functional Fluke 5450A resistance calibrator box. The unit is equipped with a wide range of resistors ranging from 1-Ohm to 100-MOhm some of which are 0.005% tolerance. The instrument powers on and shows a single LED on the front panel without any other activity.
Upon further inspection it becomes clear that there are no other activities from the main CPU despite the clock signal being present. A replacement CPU returns the unit to normal front-panel operation. The analog board also has two blown fuses which may be the result of a in-rush event. After fuse replacement the analog relay arrays also function. The unit is measured against a Keysight 3458A 8.5-digit multimeter and shows remarkable accuracy despite its age.
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TSP #221 - Anritsu MS46121A 6GHz USB Vector Network Analyzer Teardown & Reverse Engineering
26K views
February 5, 2023 3:45 PM
In this episode Shahriar presents an in-depth analysis of the an Anritsu single-port USB VNA which operates from 150kHz – 6GHz. The instrument has a corrupted firmware which prevents it from being useable.
The instrument’s internal dual-board design is presented alongside detailed analysis of the digital and RF boards. Various components are identified as well as the ferrite directional coupler at the heart of the RF path. A simple version of such a coupler is used to demonstrate the impact of the ferrite material on the low-frequency coupling factor.
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TNP #28 - CZUR E24 Pro Vertical Scanner with Live HDMI Output Review & Use-case Demos
7K views
February 2, 2023 11:33 PM
In this episode Shahriar takes a look at a mailbag item from CZUR. The ET series digital document scanners are intended for a wide range of document & book scanning situations. The free software accompanying the unit is capable various editing, stitching, batch job processing as well as OCR (optical character recognition) tasks.
You can also purchase the unit from here:
https://bit.ly/TheSignalPath-CZUR-ET24PRO;
Please note that I do NOT collect any commission from the sales. The tracked link is intended for the seller to see how the video performs for their internal evaluation.
The live 1080p 6FPS HDMI output is used along some schematic analysis to judge the suitability for future tutorial videos. The Windows application is used for several scanning examples to produce searchable PDFs using the OCR capability. The book scanning (using flattering capabilities) is also demonstrated.
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TSP #220 - Infineon 24GHz Doppler Radar Module Detailed Reverse Engineering & ASIC Analysis
66.2K views
January 15, 2023 3:47 PM
In this episode Shahriar takes a close look at the Infineon 24GHz doppler radar module in the spirit of the upcoming IEEE ISSCC 2023 Conference:
https://www.isscc.org/
The 24GHz radar module block diagram and its principle of operation is presented in details as well as the X-Ray of the PCB. Various design techniques and architectures are also explained. The RFIC ASIC is then extracted from the QFN package and examined under the microscope. The internal ASIC elements are correlated to the block diagram with discussions about various mm-wave layout techniques & high-frequency circuit design.
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