TSP #81 - Teardown & Repair of an Agilent 54845A 1.5GHz 8GS/s Infinium Oscilloscope
33.4K views
April 23, 2016 9:54 PM
In this episode Shahriar repairs an Agilent 54845A oscilloscope with an intermittent failure. The instrument occasionally fails self-calibration and the displayed waveform shows undesired spurious activities. The teardown of the instrument reveals customized front-end section coupled into a ceramic-substrate ADC ASIC designed by Agilent. The packaged ADCs are placed in sockets. The ICs are removed and the ceramic carrier is cleaned; this resolves the intermittent problem with the channels. The architecture of the scope is also presented. The functionality of the scope is verified through self-calibration, self-test and measurement of various waveform.
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TSP #80 - Teardown, Repair & Experiments of an Agilent E7495B 2.7GHz Base Station Test Set
15K views
April 18, 2016 11:48 PM
In this episode Shahriar repairs an Agilent E7495B 2.7GHz base-station test set capable of VSWR measurements as well as spectrum analysis. This particular unit is well equipped with many options however does not power on. A full teardown of the instrument reveals a faulty DC power conditioning module. The input filtering capacitor has failed. After component replacement, the unit is re-assembled. The functionality of the instrument is verified as well as a few quick experiments demonstrating various options.
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TSP #79 - Fluke PM6680B Frequency Counter 10MHz OCXO Reference Upgrade Module
14.3K views
April 15, 2016 11:50 PM
In this short episode Shahriar upgrades the recently repaired Fluke PM6680B with a new OCXO design by Dan Watson. The design of the module is examined as well various considerations for providing ultra clean 10MHz reference for instrumentation. After module installation the unit functionality is verified. More information about the module is available here:
http://syncchannel.blogspot.com/2016/02/10mhz-ocxo-teardown-cts-1960017.html
http://syncchannel.blogspot.com/2016/03/schematic-of-cts-1960017-10mhz-ocxo.html
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TSP #78 - LCD Screen Backlight CCFL to LED Replacement
228.8K views
April 2, 2016 7:19 PM
In this short episode Shahriar demonstrated how to convert a CCFL backlight to an LED backlight on an Anritsu Network Analyzer. The construction of the existing LCD screen along with the new LED driver board are presented. The LED board provides an analog pin for brightness control. The final result is very impressive!
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TSP #77 - Teardown, Repair & Experiments with the Anritsu 37347A 20GHz Vector Network Analyzer
33.2K views
March 11, 2016 1:23 AM
In this episode Shahriar repairs an Anritsu 37347A 20GHz Two-Port Network Analyzer. The unit does not boot up and as a result its internal state is unknown. The boot fault is traced to a bad RTC module which has a built-in integrated battery. A replacement unit is located which allows the unit to fully boot.
The instrument initially displays an unlock condition on the internal PLL. This problem is resolved by loading the PLL calibration files from the HDD. The complete block diagram of the unit is examined in detail and an unusual PLL intermittent locking problems is demonstrated. Various measurements on several of the internal PLLs confirm their functionality. As a final experiments, the instrument is calibrated and the S-parameters of a tune-able band-pass filter is measured.
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