First, I'm having difficulty finding a method to compress images that have useful data in them to below about 1Mb each. I'm happy to put pictures here so others may be able to find them in the future, but I will have to continue the hunt for a compression method. Suggestions are welcome, but I don't run Windows.
I see I need a notebook to keep a record of acronyms. They're the steepest part of the curve for me. That was quite an avalanche of information. I spent some time last night reading. Mainly Wikipaedia pages. I didn't know about electrostatic deflection, my knowledge was limited to the basics of picture tubes and magnetic beam steering. There's quite a wealth of information there, but the pages, and especially the one on C.R.O's are a bit terse, and want a few readings.
Between your posts and other reading, I think I've got a reasonable picture of the goings on inside an oscilloscope.
Conventions. I'm seeing both high voltage and high tension used. Is the distinction the same as for cars? That is, high voltage carries current, whereas high tension is like an ignition spark, lots of volts but only a few milliamps or so?
SMPS. I see PS, so probably a power supply, but what are the SM for?
For now I've added three new pictures to the google folder. They are both sides- full shots, and one from the top.
https://drive.google.com/drive/folders/0B3JcpACaWCPlRVEyTzZiR2xxb2c?usp=sharingMy meter is an inherited Dick Smith rebranded Fluke DMM of about 25 years age. It's upper voltage is 500.
The CRT is a Toshiba 5UP1(F) so rf+tech's guesstimate was on the money there. Pin 1 is at the very top of the socket.
So, let me say how I'm seeing things, so you can see if I'm understanding this all correctly.
There are four major blocks, for want of a better word, making up a basic CRO.
There is power conditioning. This can include filtering, transformation and rectification.
There is a circuit that powers the CRT to produce a beam of electrons. There are sub-circuits to control intensity and focus. There is an amplifier associated with this circuit.
There is a circuit that can generate a pulse. The circuit can be made to repeatedly produce pulses, thus making what can be expressed as a sawtooth waveform. This circuit varies an electrostatic charge on two vertical deflector plates in the neck of the CRT. There are sub circuits that control the period of the sawtooth wave, and triggering controls that can determine events that cause one or more sweeps of the electron beam. This circuit controls the CRT's ability to block, or blank off, the electron beam. There is an amplifier associated with this circuit.
There is a circuit that is an amplifier/filter that generates a signal to control the electrostatic charge on the two horizontal deflector plates. The signal is an analogue of variations in voltage detected by the scope probe. There is provision for varying the ratio of input to output in orders of ten.
There is high voltage at the output of every CRT control circuit.
A high -ve charge is put on the cathode and grid, because if you want a stream of electrons, they've got to come from somewhere. Electrons find each other repulsive, so the high -ve grid voltage squeezes the flow into a beam. This charge is likely to be in the low thousands of volts. It is this voltage that tautech refers to as possibly being not present.
High voltage is applied to all the deflector plates. The voltage difference between opposed plates causes electrons in the beam to change direction, the beam tending towards the more +ve plate. One can expect this voltage to be in the low hundreds.
A strong +ve field may then be applied to the beam to give it a little push along. This accelerator voltage is usually more than enough to burn your toast.
Some voltages required by a given circuit may be obtained by modifying part of the output of another circuit.
So gentlemen, does that seem to be about what's involved in making Lissajous curves?