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Chapter 7 243
Configuration - Screens and Control Fields
Control Fields on the Configuration Screens
Ref Select
This field selects the timebase reference signal to use for generating
and analyzing signals.
• Auto automatically selects an external reference if a signal of
sufficient level is detected at the EXT REF IN.
• Internal uses the Test Set’s internal timebase and ignores signals
connected to the EXT REF IN connector.
• External requires a valid reference signal to be connected to the
EXT REF IN connector.
Operating Considerations
The front-panel REFERNCE indicators show which source is selected
and whether or not the timebase is phase locked. The Test Set will not
operate correctly if it is unlocked.
Locking to an external reference may take several seconds. The lower
the frequency the longer it may take to lock to the signal.
Screen(s) Where Field is Present
INSTRUMENT CONFIGURE
Remote Mode
This field is reserved for use with special software that enables remote
operation through a PC.
Operating Considerations
When remote mode is enabled, the information displayed on the CRT
will be mirrored and sent out over the SERIAL 11 port. The incoming
serial stream will be interpreted as escape-key sequences. Access to the
configuration fields for serial port 11 will be limited, but serial ports 9
and 10 will not be affected.
This setting is retained when the instrument is turned off.
Screen(s) Where Field is Present
I/O CONFIGURE