HP 54600B User's And Service Manual page 160

External trigger (HP 54600B and HP 54603B only)
Range
Sensitivity
Coupling dc, HF reject, and noise reject
Input resistance 1 M
Input capacitance
Maximum input voltage 400 V (dc peak ac)
1
Tested, see "To verify trigger sensitivity," on page 4–18.
18 V
1
HP 54600B dc to 25 MHz
dc to 100 MHz 100 mV
HP 54603B dc to 25 MHz
dc to 60 MHz
13 pf
Performance Characteristics
50 mV
50 mV
100 mV
Trigger System
5–7