In this episode Shahriar repairs a Keysight AXIe Chassis (M9505A) with a broken power button. The power button (with built-in LED) are replaced with a functionality-similar setup. The teardown and architecture of the System Controller and Embedded Controller Module are also presented.
The star of the video is an M8190A Dual-Channel 12GS/s 12-bit (or 8GS/s 14-bit) Arbitrary Waveform Generator module. The instrument provides in excess of 90dBc SFDR, 2G-Samples of memory per-channel, digital up-converter, built-in secondary amplifier path and up to 5GHz of analog output bandwidth. The module is coupled with a Keysight S-Series Oscilloscope for experiments showing multi-tone performance as well as image-rejection and extraordinary EVM performance with modulated signals.
In this episode Shahriar reviews the long-awaited Keysight MXR-Series 8-Channel 6-GHz 16-GS/s Real-Time Oscilloscope. 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
4:09 – 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
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.
In this episode Shahriar attempts to repair a Fluke Documenting Process Calibrator. The device does not power on with neither a battery nor an external power supply. Although the schematic of this particular instrument is not available, an older model schematic shares many of the design aspects. After close examination of the circuit and various testing of power supply sub-circuit, real-time clock and main processor, it becomes clear that the problem is with a corrupt firmware. The repair is put on hold until a firmware upload method is determined.
After some help from the community, 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.
In this episode Shahriar reviews the top-of-the-line Tektronix 6-Series Oscilloscope. This 4-channel instrument offers 8-GHz of bandwidth at 25GS/s on all channel independently. Tektronix has made great strides in offering low-noise front-end custom ASICs combined with hardware digital down-conversion built into the core of the 6-Series. This enables advanced triggering across in both time and frequency domains as well as multi-domain correlated measurements.
This review is organized as follows:
00:06 – Introductions
01:42 – Instrument design, front and back panels
03:34 – Full acquisition board teardown, analysis and architecture
18:11 – PLL Experiment: Spectrum View, advanced triggering, PLL characterization and debugging
38:33 – Backplane Communication: Jitter analysis, eye diagrams, jitter composition, cross-talk
49:24 – 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.