I've been handed over a second hand Beckman Industrial Circuitmate 9020, but unfortunately it has a non-vertical slope when idle. Just by powering the scope on, the output on the cathode is as shown in the figure.
What can I do?
I've had the case of and checked, but since the squares are physically a part of the cathode there isn't much I can do in that respect?
I am not familiar with your particular scope, but genrally speaking there will be a
a control marked "Trace Rotate", find that contol and adjust it.
The trace rotate contol is usually located on the back panel.
That should sort out your problem.
JimB
On edit:
I found a copy of the manual for this scope on the internet, it is here https://www.eserviceinfo.com/downloadsm/33077/Beckman%20Industrial_Circuitmate%209020.html
the text is in French, which may or may not be a problem for you, but the trace rotate control is VR588 and is at the bottom right hand corner of the schematic on page 37 of the manual.
The adjustment procedure is on page 30 of the manual.
The control appears to be physically located at the right hand side of the case.