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January 28, 2008
about a year ago
By far the best scope I have found for the clock is a Bell and Howell (Heath) model 10D-203-31 student model oscilloscope. With this particular scope it MUST have all the electrolytic capacitors replaced, the paper caps in the CRT power supply replaced and also the internal adjustment pots replaced in order to have any kind of reliability and stability of the adjustments. Also removing the green filter allows the full CRT face to be used.
This clock board will work quite nicely with some of the student model kit oscilloscopes which otherwise would not be usable given their limitations.
I built mine into a Bell & Howell (Heath) solid state student model scope and it works quite well after about a 30 minute warmup period. One thing though. Had to remove the green filter in order to use the whole CRT face.
about 3 years ago
I have an older engine analyzer with a CRT that from what I found online was used in vector monitors. I already know where to input the signal to the vertical and horizontal deflection amp cards.
Will the slower drawing rate version of the firmware work on that display? If so how can I get a copy of it?
I’ve used this on several different older scopes (mostly vacuum tube operated) and it works well EXCEPT on scopes that use single ended deflection amps such as a scope that uses a 3AP1 CRT. That said even though those scopes do not go to 2 MHz I don’t know how high in frequency the deflection amps can handle.
I use a Tektronix 606A X/Y monitor and had a similar problem. You will need to attenuate the ZINV output. Best way to do that is use a variable resistor of 10K or higher or lower (depending on the input impedance of the Z axis circuit) and set it until the picture looks proper. You can then measure the variable resistor and install a couple fixed resistors.
about 5 years ago
I got a question. I want to add a series resistor to the X/Y outputs to protect them from accidental shorts. What is the smallest value resistor that I can use without affecting the display and that will not allow too much current through the chip if the output gets shorted to ground? I connected the clock to a scope and somehow shorted one output. Now the clock don’t work right.
I have noticed a problem. On my clock whenever it is in PPS 1Hz mode the clock jumps from 0 to 1 seconds in less than a second which makes the clock gain a few seconds in under an hour. Now if I use PPS 4096 mode it don’t do that. Is there a way to fix it as I don’t want to have to select PPS 4096 mode each time I power up the clock. I have the latest firmware installed as well.
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