6-15
IM 704510-01E
Setting Measurement Conditions
3
2
1
4
5
6
7
8
9
10
11
12
13
14
15
6.8
Settings When Applying an External Reference
Clock Signal
For a functional description, see 2.5.
Procedure
1.
Press the SAMPLE key to display the Sample menu.
2.
Press the Ref.Clock soft key to select Ext.
Explanation
Selecting the Reference Clock
Select Ext when applying a reference clock signal externally. To set the reference clock
back to the internal signal, select Int.
• Int: Uses the internal reference clock signal for operation.
• Ext: Uses the external reference clock signal for operation.
Input Method of the External Reference Clock Signal
Apply a reference clock signal to the reference input terminal marked REF IN on the rear
panel according to the following specifications.
• Input frequency range:
10 MHz
±
10 Hz
• Input impedance:
1 k
Ω
or more
• Input coupling:
AC
• Input level:
1 Vp-p or more
• Maximum input voltage:
±
10 V
• Connector type:
BNC
CAUTION
Applying a voltage that exceeds the maximum input voltage indicated above to
the reference input terminal can damage the instrument.
22 k
Ω
1.5 k
Ω
100 pF
Reference input circuit
Buffer
amplifier
