The 81150A / 81160A will accept modulation from an internal or external
modulation source. In case of internal modulation, the modulation signal can
be the ‘other channel’ (2 channel instrument only) or the internal modulation
source of the modulated channel.
Modulating frequency (internal source):
81150A: 1 mHz to 10 MHz
81160A: 1 mHz to 50 MHz
The default is 10 Hz.
After enabling PM, press the PM Frequency softkey. Then use the knob or
numeric keypad to enter the desired PM Frequency.