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Philips PM5715 Pulse Generator
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No more display output on the Hameg hm1005
Unfortunately, the output has disappeared from the Hameg hm1005. This is most likely caused by the previous repair to the final vertical amplifier. The problem seems to manifest slightly differently as the under and over scan indicators do not seems to suggest the trace is off screen. Hopefully none of the transistors are damaged as the vertical amplifier is carefully balanced using complementary pairs of transistors for all its half a dozen stages.
We should investigate the cause at some point. Starting with blanking circuits and afterwards following the signal paths from were both inputs are combined into the amplifier.
It should be noted that there is also no horizontal output or deflection so perhaps the HV power supply has issues.
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Philips PM6654 timer final cleaning and installation
The exterior of the Philips PM6654 is cleaned using wet wipes, paper towels and some light detergent. Primarily the top cover had several stains. Afterwards the device was fully reassembled and placed in a more permanent position next to the Hameg HM1005.
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Philips PM6654 intake and display repair
The initial intake of the Philips PM6654 went pretty smoothly. Most features are tested including frequency, pulse width, rise and fall time and phase. Particularly rise and fall time as well as phase measurements seem quite sensitive and it is difficult to produce good readings. This aligns with the user and service manuals were these measurements are averaged and require substantial dead time between measurements.
All operations do seem within specification so no adjustments are needed. However, the display does show weaknesses. This included the first 3/4 decimals not lighting up, the second function column not lighting up and the display of Hz / Seconds / Volts being intermittent.
Upon investigation the cause was found to be a tiny piece of metal that was hanging from a spider web. This spider web was in close proximity to pins on the rear shorting them together intermittently. Removing this piece of metal as well as some general debris removal resolved the issue entirely.
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Philips PM6654 timer / counter exterior and interior components
High resolution photos showing the outsides of the PM6654 timer / counter from Philips as well as the internal circuit boards.
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PM6654 programmable timer / counter
This programmable counter / timer from Philips is a very versatile unit capable of many computations including pulse width, rise and fall time and duty cycle across. The device has two inputs and is able to compute differences between the two including phase. Custom computations between the two inputs can be defined and enabled using the 9 digit keyboard.
Several limitations apply to more complex computations such as those of phase and rise and fall time. These typically manifest in a mandatory dead time of several 10s to 100s of nanoseconds which severely reduces the maximum frequency (2 MHz for phase & 10 MHz for rise and fall).
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HP 16500B/16501A Logic Analysis System User's Reference
User manual for the HP 16500B and 16501A logic analyzers often called Logic Analysis System (LSA) by HP. Includes general usage, system options and logic module operations.
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HP 16500B/16501A Logic Analysis System User's Reference, Volume 1
Binder for HP 16500B/16501A Logic Analysis System User's Reference. Contains first volume with system floppy discs (4 in total), HP16500B/16051A mainframe user reference, system options chapter and common module operations chapter.
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Philips PM 5771 internal components and construction
Internal construction, components and wiring of the Philips PM 5771 pulse generator
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PM5771
The Philips PM 5771 is a pulse generator operating from 1 hz to 100 Mhz with fine grained pulse shaping controls.
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Philips dual trace storage oscilloscope PM 3251 user manual
The user manual for the analog storage functionality of the Philips PM3251 analog storage oscilloscope.
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Philips HF Multiplikator Oszillograf PM 3252 anleitung
Introduction to the X times Y multiplication feature in the Philips PM3252 analog oscilloscope.
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Philips HF Multiplikator und Speicheroszillograf PM 3253 anleitung
Introduction about the X times Y and analog storage functionality of the Philips PM 3253 analog storage oscilloscope.
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Introduction manual
Separate section often found in a manual binder for specific devices
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Philips PM 3250 (X) gebrauschsanleitung
German user manual for the Philips PM 3250 (X) focusing in particular on the base functionality included with the device.
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User manual
Manuals used to instruct about using a particular device
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Philips PM 3250 manual binder
Binder for the Philips PM 3250 and PM 3253 containing instruction and service manuals.
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Philips PM 3250 (X) dual-trace oscilloscope service manual
Service manual for the Philips PM3250(X) dual trace analog oscilloscope. Contains a circuit description, introduction, Dismantling guide, Adjustment and calibration section, general fault finding guide and a parts list. Contains roughly 40 individual figures.
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Service Manual
A type of manual used to service a device or sub-assembly. Typically these contain calibration instructions, schematics, board overlays, exploded views and parts lists among others.
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HP 54501A
The 54501A is a digital oscilloscope with 100Mhz bandwidth and 4 channels. The device is quite feature rich for its era have dedicated measurement functionality for frequency and amplitude analysis. Up to three measurements can be active at any given time. Other notable features include the ability to store four waveforms in nonvolatile memory, autoscaling and averaging using up to 2038 samples
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Broken B input
The B input of the PM3206 has stopped working from 50mv/div and above. Does not appear to be a loose connection. Needs further investigation
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Hameg HM 1005 oscilloscope repair
The vertical deflection driver for the CRT had been known bad for quite some time. Upon investigation a damaged trace was found (image 1) on one side of the totem pole drivers and it was bridged (image 2).
After this the unit appeared fully functional if not for several intermittent potentiometers. After identifying several of these potentiometers including, brightness, focus and timebase further ailments where discovered. These include the misalignment of the delay and regular timebase.
The timebases where promptly realigned by adjusting the belt (image 3).
Finally, the front panel was cleaned (image 4 and 5). The final steps remain to clean or replace misbehaving potentiometers.
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Hameg HM 1005
The Hameg HM1005 is a dual channel analog oscilloscope with 50Mhz bandwidth. Notable features include a delay timebase and 10x horizontal zoom. Notably, the delay timebase offset is configured using a digital circuit with LED bubble display.
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Hameg
HAMEG Instruments was founded in 1957 in Germany. It made electronic measurement equipment such as oscilloscopes and spectrum analyzers until it became part of Rohde & Schwarz in 2016. It is now defunct.
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HP 16500B exterior and internal cards
The outside exterior of the HP 16500B logic analyzer as well as internal cards and components