Kikusui KJM6710, Operation Manual, Page: 30 / 60

3-12 Operation KJM6710
Example: When the signal’s duty cycle is 50 %
Fig.3-11
Since a signal having 50 % duty cycle such as a sinusoidal wave does
not have a DC component as shown in Fig. 3-11, the preset slice level
and the actual slice level match. Therefore, when slicing the signal at
the center of the peak-to-peak amplitude of the signal, use the
SYM:OFFS:LEV message to set the slice level to 0. Amplitude of
100 % corresponds the slice level reading of approximately to 600.
Example: When the signal’s duty cycle is not 50 %
Fig.3-12
If a signal that does not have 50 % duty cycle is input as shown in Fig.
3-12, a DC offset is generated when the input is AC coupled. In the
example given in Fig. 3-12, the duty cycle of the input signal is 25:75.
Thus, after the signal is AC coupled, the signal shifts up by 25 %.
Therefore, when slicing the signal at the center of the peak-to-peak
amplitude of the signal, you must use the SYM:OFFS:LEV message
to set the slice level approximately to 150.
If the duty cycle is not 50 %, check the signal using an oscilloscope or
some similar means and set the optimum slice level by referring to the
example above.
In addition, the frequency bandwidth of the RF input is approxi-
mately 60 MHz. Therefore, operation will fail on narrow pulses of
which the pulse width falls below 15 ns, because of amplitude drop-
outs.
100 %
Slice level
+300
0 (0 V)
–300
Slice level
+450
0 (0 V)
–
150
25 % 75 %
+150
100 %