In this episode Shahriar continues his review of the Tektronix 5-Series 8-Channel MSO Oscilloscope following the original overview of the instrument. A full teardown of the instrument as well as a set of experiments showcasing the new Spectrum View capability are shown. This review is organized as follows:
00:09 – Introduction and outline
01:31 – Teardown and analysis of the acquisition board
13:38 – Experiment setup and description
16:59 – Measurement results and Spectrum View capabilities
33:12 – Concluding remarks
In this episode Shahriar takes a close look at an EG&G DSP-Based Lock-In Amplifier. This instrument provides excellent sensitivity for both voltage and current inputs and is based on a fully digital architecture. The instrument’s LCD screen is dim and unreadable. Furthermore, a few lines are missing from the LCD pointing to a failed zebra strip.
The instrument’s block diagram is examined and explained. The teardown reveals the structure of the LCD screen, front-end blocks and internal PLL. The CCFL back-light inverter is located and replaced with a low-voltage DC-DC converter for use with an LED strip. The instrument’s functionality is verified through a few experiments including measuring the 3dB bandwidth of an RC filter as well as measuring the photo-current induced in an LED using a synchronized infrared light source.
In this episode Shahriar investigates a malfunctioning E3646A Dual Channel Programmable Power Supply. The power supply provides the correct output voltage on one channel. However, the second channel produces no output and continuously reads 0V and 0A.
Applying an external voltage to the malfunctioning channel produces the correct readout from the instrument display suggesting that most of the channel circuitry is functional. After a close examination of the power supply schematics, the problem is traced to a failed solder joint. The DAC output amplifier is disconnected from the output transistor and after repairing the colder joint, the power supply is fully functional.
In this episode Shahriar reviews his new 3D Printer Sindoh 3DWOX 1. This printer offers several attractive features. The fully enclosed design is quiet and equipped with a HEPA filter. The unit is also equipped with a webcam and internal lighting. The printer has several automatic capabilities such as auto filament load from a cartridge, bed-leveling and print parameter optimization. The printer is also completely compatible with off-the-shelf filaments.
This comprehensive review is organized as follows:
01:57 – Model comparison and Sindoh website
02:26 – Printer design and overview
04:16 – Internal construction and features
07:03 – Cartridge design and filament auto-load
09:31 – Printing bed auto-leveling procedure
11:53 – 3DWOX desktop software overview and features
16:32 – First print example and procedure
17:53 – Mobile app and remote camera monitoring capability
18:51 – Print example: Objects with extreme aspect ratios
22:03 – Print example: Objects with moving parts and joints
25:27 – Print example: Objects with many holes and thin features
28:24 – Print example: Large objects with >24 hour print time
30:12 – Analyzing internal print features using an X-ray machine
32:46 – Printing microwave and mm-wave components and filters
38:27 – Concluding remarks
In this episode Shahriar reviews the very unique SAF Spectrum Compact V-Band portable spectrum analyzer. These battery powered devices do not require external down-converters, and a particularly useful tool for any field engineer performing microwave equipment installation, link troubleshooting, site planning and maintenance. The analyzers utilize a resistive touch screen, allowing the engineer to wear gloves when using the device. The Spectrum Compact can be used for high precision detection of existing interference on installed paths or available radio channels. Data logging of all spectrum scans is available with the Spectrum Compact device, and enhanced data processing and analysis are provided by SAF Tehnika designed PC software for your laptop.
The instrument teardown reveals a multi-board design and each module’s functionality and design is presented. The unit is then used in several experiments to track and analyze various V-Band RF signals. The review is organized as follows:
01:00 – Overview and model comparison
03:16 – Instrument design, overview power-on benefits
05:23 – Instrument GUI overview
09:56 – Full teardown and analysis of all modules
19:22 – Experiments with various unknown V-Band RF signals
29:43 – PC software overview and capabilities
31:30 – 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.