HP 120A - Page 30

Sect. II Page 14
INTENSITY MODULATION OPERATION
INTENSITY
MODULATION
CAUTION - The deflection plates of the oscil 
loscope operate at a de potential above ground.
TURN THE INSTRUMENT OFF BEFORE RE 
MOVING THE COVER PLATE FROM THE DE 
FLECTION PLATE TERMINALS, TO AVOID
COMING IN CONTACT WITH HIGH VOLTAGES.
To intensity modulate with an external signal:
1. Remove the vertical jumper marked Z-axis.
2. Connect the external intensity modulation
signal to these terminals (a negative signal
will brighten the trace).
Figure 2-12