Old 'scope adventures

[John Marsh]

Hi everyone,
I have an ancient Heathkit 10-12U oscilloscope,full of valves (tubes)
and great for airing laundry. It seems to be only AC coupled; i.e.
connecting a steady DC source produces a brief jump of the trace. If I
connect a source of pulsed DC which peaks at 9V, how do I interpret &
calibrate the trace? Pulse generator is a 555 timer as astable.
Viva valves,
John.

 

[Jamie]

look on the input line, or some where around it.
you should have a switch that saids DC/AC input.


John Marsh wrote:

Hi everyone,
I have an ancient Heathkit 10-12U oscilloscope,full of valves (tubes)
and great for airing laundry. It seems to be only AC coupled; i.e.
connecting a steady DC source produces a brief jump of the trace. If I
connect a source of pulsed DC which peaks at 9V, how do I interpret &
calibrate the trace? Pulse generator is a 555 timer as astable.
Viva valves,
John.