In this episode Shahriar repairs an Agilent 4338B milliohmmeter. This instrument is capable of measuring extremely small resistances down to 10uΩ while maintaining a DUT voltage of less than 20mV. The instrument powers on with the message ADC Failure. Investigation reveals that the instrument uses an obsolete ADC which must be removed from the board in order to reverse engineer its operation. While the ADC turns out to be functional, a PAL device which controls the ADC timing is faulty. A new device is salvaged from a donor board to complete the repair. The instrument is then used to measure several small known resistances.
Tag Archive for Digital
In this episode Shahriar presents an overview of a small portion of the vendors present on the exhibition floor at the International Microwave Symposium 2018.
The IEEE MTT International Microwave Symposium (IMS) is the premier annual international meeting for technologists involved in all aspects of microwave theory and practice. It consists of a full week of events, including technical paper presentations, workshops, and tutorials, as well as numerous social events and networking opportunities. The symposium also hosts a large commercial exhibition. Co-located with IMS are the IEEE RFIC, IMBioC and ARFTG conferences.
The video is organized as follows:
00:00:08 – Introductions
00:02:21 – Keysight Technologies (www.Keysight.com)
00:12:25 – Rohde & Schwarz (www.rohde-schwarz.com)
00:21:12 – X-Microwave (www.xmicrowave.com)
00:26:49 – MPI-Corporation (www.mpi-corporation.com)
00:33:34 – Siglent Technologies (www.siglentamerica.com)
00:36:56 – Signal Hound (www.signalhound.com)
00:40:34 – Mini-Circuits (www.minicircuits.com)
00:44:39 – Pico Technology (www.picotech.com)
00:48:11 – Virginia Diodes Inc. (www.vadiodes.com)
00:50:21 – SAF Tehnika (www.saftehnika.com)
00:52:28 – LPFK (www.lpkf.com)
00:55:45 – Teledyne Technologies (www.teledyne.com)
00:56:55 – Maury-Microwave (www.maurymw.com)
00:58:20 – Noisecom & Boonton (www.noisecom.com)
01:00:00 – Guzik Technical Enterprises (www.guzik.com)
01:03:00 – Connectronics Inc. (www.connectronicsinc.com)
01:03:43 – A.J. Tuck Company (ajtuckco.dyndns.org)
01:04:51 – HyperLabs Inc. (www.hyperlabsinc.com)
01:07:15 – Holzworth Instruments (www.holzworth.com)
In this episode Shahriar reviews the Rohde & Shwarz RTB2004 10-Bit oscilloscope. With its high-resolution touch-screen, intuitive and capable GUI as well as excellent analog/digital performance this scope competes very well against other 2000 series instruments from Tektronix and Keysight. This extensive review includes instrument teardown, overview and dedicated experiments as follows:
01:17 – Model comparison and R&S scope lineup.
02:20 – Front panel, rear panel and overview.
05:01 – Instrument teardown and analysis.
13:37 – Power on and basic functions including intensity grading, XY mode.
26:29 – Multi-tone behavior, FFT and ADC performance.
33:17 – Experiment with ambient light follower: Analog and RS232 digital serial capture, triggering and analysis.
48:03 – Experiment with external DAC: Analog and I2C data capture and search using remote web interface.
57:19 – Built-in arbitrary waveform generator behavior and performance.
In this short episode Shahriar demonstrates an overview of the new Tektronix MSO58 8-Channel 6.25GS/s 2GHz Mixed-Signal Oscilloscope with up to 64-Bits of digital channels. The scope features independent ADC, data acquisition and memory per channel as well as FlexChannel architecture which allows each channel to act as either a 2GHz analog channel or an 8-Bit digital channel. The scope also features a brand new GUI interface on an HD 15.6″ display with significant performance enhancement and touch interface optimizations. A full review of the instrument will be provided in the future.
In this episode Shahriar performs a full review on the Tektronix MDO4000C series mixed domain oscilloscope, particularly model MDO4104C-6. The MDO4000C combines up to six instruments including a function generator and a built-in spectrum analyzer. Unlike any other instrument, it can synchronize RF, analog and digital channels. These correlated measurements provide insight into difficult to find problems particularly intermittent events.
This review begins with a comparison between the MDO4000B and MDO4000C instruments. The full review of the MDO4000B can be viewed here. All experiments demonstrated in the MDO4000B review are also relevant to the MDO4000C instrument.
The teardown of the instrument reveals a multi-board construction where the ADCs, FPGAs, application processor and memory are on the main system board. A complete analysis of the entire system is presented including the operation of the RF module.
In order to demonstrate the instrument’s capabilities, an encrypted frequency hopping transmitter system is analyzed. The system exhibits various problems such as high BER, low SFDR, poor phase-noise and EVM. The MDO4000C is used to perform advanced measurements across analog, digital and RF domain to track and resolve these problem. The complete block diagram of the experiment can be found here.