Agilent Technologies E8285A manual EXT REF Input, See Also Gpib Adrs field description, on

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

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