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Chapter 2, Description of Connectors
Connectors
EXT REF INPUT
This input provides a frequency reference for the Test Set’s internal phase-locked-
loops.
Operating Considerations
•BNC
• This Test Set does not require a jumper between the 10 MHz OUTPUT and the EXT
REF INPUT.
• When the TimeBase field is set to Auto
, the Test Set will lock to a 1, 2, 5, or 10 MHz
reference signal once it has been detected on the rear-panel EXT REF INPUT
connector. Below the TimeBase field the Test Set will display External if an
external reference signal is detected. If not, the Test Set will display Internal,
indicating that the Test Set is using its internal high-stability 10 MHz timebase as a
reference.
• When the TimeBase field is set to Int
, the TimeBase field will display
Internal, and the Test Set will use its internal high-stability 10 MHz timebase as a
reference.
• Input level must be >0.15 Vrms
• Input impedance = 50 ohms
• Duty cycle must be 90%
GPIB
The main GPIB port allows communication between the Test Set and other
instruments or computers using the General Purpose Interface Bus (GPIB).
Operating Considerations
• 36-pin GPIB
See Also
GPIB Adrs
field description, on page 272