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4.1 Selecting the Measurement Function and Polarity
Explanation
4-2
You can select the measurement function (measurement parameter). For each function,
you can select the polarity of the signals to measure.
Data-to-Clock Phase Difference (D-to-C) Jitter or Data-to-Clock Phase Difference
(E2T) Jitter Excluding 2T
You can set the item to be measured as either the phase difference jitter between the
measurement input signal (RF signal) and clock signal (D-to-C), or the phase difference
jitter* between the measurement input signal excluding 2T and clock signal (E2T). The
clock signal used is the one regenerated from the RF signal inside the instrument.
* E2T cannot be selected on products with suffix code -BDS.
Polarity
You can select which polarity of RF data signals to measure.
•
: The rising slope becomes the phase difference jitter measurement starting
point.
•
: The falling slope becomes the phase difference jitter measurement starting
point.
•
and : The rising and falling slopes alternately become the starting point for
phase difference jitter measurement.
Pulse Width (PW) Jitter
You can select to measure the pulse width jitter in the measurement input signal (RF
signal).
• Polarity
You can select which polarity of signals to measure.
•
: Measures the positive side (from the rising slope to the next falling slope) of
the pulse width.
•
: Measures the negative side (from the falling slope to the next rising slope) of
the pulse width.
• Upper and Lower Limit of the Pulse Width to be Measured
The limit values can be set in the following range when the measurement function is
set to pulse width jitter.
Setting range for pulse width lower limit: 0.00 to 998.99 ns (in steps of 0.01 ns)
Setting range for pulse width upper limit: 1.00 to 999.99 ns (in steps of 0.01 ns)
The minimum difference (in time) between the upper and lower limit is 1 ns. If the
lower limit is set equal to or higher than the upper limit (or vice versa), the upper limit
is automatically raised to 1 ns above the lower limit (or vice versa).
Note
•
Setup information (measurement conditions) can be saved for each measurement
function. However, the key lock ON/OFF setting (see section 11.4), communication
settings (see chapters 8 and 9), and other global settings are always the same regardless
of the function.
•
The clock signal used is the one regenerated from the RF signal inside the instrument.
The frequency range of the regenerated clock signal is 66 MHz±3%.
•
If the clock cannot be regenerated by the PLL circuit (PLL unlock), the meter needle goes
beyond the scale line that indicates the maximum value of each scale, and the characters
"unLoC" appear on Display 1. The jitter ratio output and determination output (see section
7.1) are 5 V and 0 V respectively.
IM 704610-01E
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