NF FRA51602, Instruction Manual

Page: 82 / 286

3.5 Operation screen reference
3
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44
FRA 51602
■ [10MHz REF]
– [IN] : Set the reference clock input.
This is used to obtain higher frequency accuracy and stability by using an external reference clock that is
more accurate than the internal reference clock of the instrument. This is also used to make frequency
accuracy common among multiple instruments.
○ Setting method
< List operations (confirming) >
• DISABLE
: Use the internal reference clock.
• ENABLE
: Use an external reference clock if an external reference clock is available.
Even if ENABLE is set, the internal reference clock of the instrument will be used if an external reference
clock is not detected or if the frequency differs from the specified frequency. The reference clock on
which the instrument is currently operating is indicated by the status display in the upper part of the LCD
screen.
■ [10 MHz REF]
– [OUT] : Set the reference clock output
This is set when the reference clock on which the instrument is operating is output from the 10 MHz
REF OUT connector on the rear panel. This is done so that this instrument and other devices can operate
with the same frequency accuracy.
○ Setting method
< List operations (confirming) >
• DISABLE
: The reference clock is not output.
• ENABLE
: The reference clock is output.
When the instrument is operating on an external reference clock, the output frequency is the same as that
reference clock.
■ [AMPLITUDE COMPRESSION]
: Set the amplitude compression function
This is used to automatically adjust the output amplitude of the oscillator to supply a constant amplitude
to the circuit being measured. For more information on the amplitude compression function, refer to "
5.7
Amplitude compression
".
INT : Operating on the internal reference clock
EXT : Operating on the external reference clock