TSP #225 - Agilent E5052A 7GHz Signal Source Analyzer Teardown, Repair & Experiments
19.7K views
April 22, 2023 10:51 PM
In this episode Shahriar takes a look at a faulty E5052A signal source analyzer. Despite their age, these signal-source analyzers are highly sought after and very valuable. Although the analyzer can measure phase noise, it reports the incorrect input signal power across frequency. Initial assessments shows that the reported measured power varies wildly across the band.
The system block diagram is shown and principle operation of the instrument is described. From there, a few measurements are devised to verify the operation of the detectors, power splitter, etc. The problem is traced down to a broken connector on a custom resistive power divider. After the repair, the instrument reports the correct power. The overall performance is verified by measuring the phase noise of a Signal House PNCS-1 using cross correlation techniques.
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TNP #32 - Fluke 732A DC (10V, 1.018V, 1V) Reference Standard Quick Repair
11.6K views
April 22, 2023 5:15 PM
In this episode Shahriar quickly repairs a faulty Fluke 732A DC Reference Standard. Although the unit does produce a good 10V and 1.018V output, the 1V output shows no voltage at all. A close examination of the schematic shows that the 1V output is derived through a resistor divider from the 10V source.
Since no resistance can be measured from the 1V to any of the other ports, it is suspected that the failure is caused by a broken connection behind the front panel. The connection is corrected and the unit produces all desired output signals.
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TNP #31 - HP 87421 & 83017A 26.5GHz Microwave System Amplifier Teardown, Repair & Experiments
15.2K views
April 9, 2023 10:58 PM
In this episode Shahriar repairs an HP 87421 power supply in order to revive a HP 83017A 0.5-26.6GHz Microwave System Amplifier. The power supply has multiple bad capacitors which can be readily exchanged. An X-ray of a bad versus good capacitor is also shown. A custom cable must be made and the pinouts of each module should be revers engineered.
The amplifier successful powers on and various performance metrics are measured. S-parameters, noise figure, PSAT, OIP3 and detector are all measured and verified. The instrument used are the Keysight FieldFox, Junkosha RF cables, R&S NRP power sensor, R&S SMB RF Vector Generator and R&S ZNL20 real-time spectrum analyzer / network analyzer hybrid.
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TNP #30 - Agilent 4349B 4-Channel High Resistance Meter Teardown, Repair & Experiments
16.9K views
April 2, 2023 10:28 AM
In this episode Shahriar “repairs” an HP/Agilent 4349B 4-channel high-resistance meter capable of measuring up to 10^15 Ohms! The instrument has four independent channels and requires an external power supply for measurements.
The instrument does not boot, but unplugging and re-plugging the cables fixes this issue. After some analysis of the theory of operation, a 1G-Ohm resistor is used for performance verification. The resistor is also measured against the Keysight & Keithley 8.5-digit/7.5-digit multimeters as well as the Keithley 2470 1000V SMU.
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TNP #29 - How many LEDs can you light up with a hot dog?
16.7K views
March 31, 2023 9:26 PM
In this Episode Shahriar attempts to answer a fundamental scientific question, within the budget of The Signal Path. In this case, the question that has confounded scientists since the invention of LEDs: How many LEDs can you light up using a hot dog?!
http://www.TheSignalPath.com
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