Agilent Technologies 7000B Series User Manual page 390

18 Oscilloscope Utility Settings
If the externally supplied sample clock varies greater than 0.5% from
10 MHz a soft unlock will occur. The oscilloscope will continue to acquire
data but the lock symbol in the upper right part of the display will
become a red unlocked padlock icon.
If the externally supplied sample clock signal is lost, a hard unlock will
occur. The lock symbol in the upper right part of the display will become
a red unlocked padlock icon and the oscilloscope will stop acquiring data.
The oscilloscope will resume sampling when the externally supplied
sample clock becomes stable again.
To synchronize the timebase of two or more instruments
The oscilloscope can output it's 10 MHz system clock for the purpose of
synchronization with other instruments.
1 Connect a BNC cable to the BNC connector labeled 10 MHz REF on the
2 Connect the other end of the BNC cable to the instrument(s) that will
3 Press [Utility] > Options > Rear Panel > Ref Signal.
4 Use the Entry Knob and the Ref Signal softkey to select 10 MHz output.
The oscilloscope will output it's 10 MHz reference signal at TTL levels.
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rear panel of the oscilloscope.
accept the 10 MHz reference signal. Put a 50  termination at the input
to the other instrument to terminate the signal.
10 MHz unlock icon
10 MHz unlock icon and system stopped
InfiniiVision 7000B Series Oscilloscopes User's Guide