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 Analog
In this episode Shahriar investigates an Agilent E4981A high-speed capacitance meter which fails self-test during startup. The instrument reports a series of errors associated with the CPU board. The teardown reveals a multi-board construction where the main analog assembly employs an FPGA for control and interface to the main CPU board. The unit has a disconnected ribbon cable between the analog board and the main CPU assembly. After correcting the problem the instrument completes self-test without errors.
After the repair the unit is used to measure several known capacitors for functionality verification. Finally the instrument is used to measure a hand-made parallel plate capacitor. The capacitor can accept various types of dielectric material whose impact is studied.
In this episode Shahriar presents 5 interesting things from around the lab! The topics range from optics to microwave components. The video is organized at follows:
00:38 – Pasternak 12GHz-14GHz continuously tuneable 20dB attenuator. How does it work?
11:02 – Ultra-high efficiency triple jacket glass distillation dewar.
14:59 – AWG PLC 8-way WDM splitter on 50GHz channels.
24:15 – PCB embedded D-Band waveguide with Vivaldi launch end-points.
28:45 – Hidden security features of the Canadian currency.
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 takes a close look at the newly released Siglent SDG6000X Series Pulse / Arbitrary Waveform Generator. SDG6000X is a series of dual-channel Pulse/ Arbitrary Waveform Generators that feature up to 500MHz output frequency, a maximum sample rate of 2.4GSa/s and 16-bit vertical resolution when used as a function generator. The particular reviewed model is the SDG6052X which is the top-end model.
The full teardown of the unit reveals the internal architecture of the instrument, DAC / FPGA interconnect as well as the output amplifier structure. Although the limitations of the FPGA prevents the instrument to operate at full 2.5GSa/s in arb-mode, the instrument is capable of providing complex modulation up to the full 500MHz signal bandwidth.
This comprehensive review is organized as follows:
00:01:11 – Siglent SDG model overview and comparison
00:03:10 – Front and back panel overview
00:06:24 – Full teardown and analysis of the instrument archietecture
00:18:19 – GUI overview, menu structures and built-in functions
00:22:31 – Waveform phase and amplitude accuracy, characterizing a 180-degree hybrid
00:30:42 – Large-signal generation, ultra-sound experiment and range measurements
00:36:38 – Pulse generation performance, spectral content and low-pass filter measurements
00:44:07 – THD measurements, harmonic generation, Two-tone TOI measurements using waveform combine function
00:50:30 – PRBS pattern generator, ISI measurements and eye-diagram impairments using waveform combine functions
01:01:57 – I/Q modulation and waveform creation using EasyIQ as well as superheterodyne up-converter measurements
01:10:44 – Concluding remarks