Well,
My TEAS (Test Equipment Acquisition Syndrome) condition seems to worsen; I have acquired another Nixie frequency counter from that great auction site.
I've fiddled around with it considerably to get the internal clock to stabilise - some bright spark, maybe even the designer, has stuck a block of polystyrene (Styrofoam) over the crystal to try and maintain some temperature stability - but alas its all over the shop.
So, I've basically hacked two holes into the back of the unit and added an external reference clock input - this can be supplied by my ever faithful shack frequency reference.
So this is the unit; albeit on its side:
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And here the small modification I've made:
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The circuit forces whatever signal is on the input to be +ve DC - I've built it dead bug style on the back of the input BNC socket:
![]()
This is where I was poking about to find the clock output:
![]()
Using some of my other ancient test gear acquired through my TEAS condition:
![]()
Here's the result:
Lovely Jubbly.
My TEAS (Test Equipment Acquisition Syndrome) condition seems to worsen; I have acquired another Nixie frequency counter from that great auction site.
I've fiddled around with it considerably to get the internal clock to stabilise - some bright spark, maybe even the designer, has stuck a block of polystyrene (Styrofoam) over the crystal to try and maintain some temperature stability - but alas its all over the shop.
So, I've basically hacked two holes into the back of the unit and added an external reference clock input - this can be supplied by my ever faithful shack frequency reference.
So this is the unit; albeit on its side:
And here the small modification I've made:
The circuit forces whatever signal is on the input to be +ve DC - I've built it dead bug style on the back of the input BNC socket:
This is where I was poking about to find the clock output:
Using some of my other ancient test gear acquired through my TEAS condition:
Here's the result:
Lovely Jubbly.