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5.2 Turning Numerical Value Display and/or Character Display ON and OFF
Explanation
5-4
The TA220 continuously makes measurements when the power is turned ON. The meter
needle indicates the jitter ratio or jitter of the measurement function that was selected in
section 4.1, and the numerical value is displayed in Display 1.
Switching the Numerical Value Display
You can switch the parameter whose numerical value is displayed in Display 1. Display
2 shows the parameter whose value is displayed in Display 1. The parameters you can
select from are those whose display property is set to ON in "Numerical Value Display
Parameters" below (σ/T, σ, AVE, T, SuU, SnL, EQ, and Dly).
"Lv (voltage level)" can also be displayed when measurement of the RF signal voltage
level is turned ON (see 7.2 section).
Numerical Value Display Parameters
You can select an item to be displayed from among the following when changing the
display according to the procedure above ("Switching the Numerical Value Display").
You can turn the display property of each parameter ON or OFF. However, if display is
turned ON for only one parameter, it cannot be turned OFF.
Displayed Characters
Dispσ/T
Disp σ
DispAVE
Disp T
DispSnU
DispSnL
Disp EQ
DispDly
* The number of data sampled in order to measure the jitter ratio and jitter.
Turning Display of Numerical Values and Characters ON and OFF
If you are distracted by the changing jitter ratio, jitter, or average values, or blinking
setting values, you can turn the display of numerical values and alphabetical characters,
as well as the units indicator on Display 1 and Display 2 OFF all at once.
Note
•
Even when the numerical display is turned OFF, the display shows the setup values when
setting the TA220. For the setup procedures of each type, see the corresponding sections
in chapter 4. Error code and version information is still displayed even if numerical value
display is turned OFF.
•
If the numerical value to be displayed cannot be obtained, Display 1 shows "- - - - -" (bar).
•
If the clock cannot be regenerated by the PLL circuit during D-To-C measurement (PLL
unlock), unLoC is displayed on Display 1. The jitter ratio output and determination output
(see section 7.1) are 5 V and 0 V respectively.
•
If the average coefficient for the DC output filter (see section 7.1) or the jitter ratio
correction coefficient (see section 7.1) is something other than the default value, the letter
F is displayed in inverse video on Display 2 to the left of the characters indicating which
parameter is being displayed (except when equalizer boost amount EQ and arming delay
time Dly are displayed).
Display Contents
Jitter ratio (see section 2.3)
Jitter (see section 2.3)
Jitter average (see section 2.3)
When the measurement function is set to pulse width
Difference between the upper and lower limit of the pulse width
set in section 4.1
When the measurement function is set to D-to-C
Period of the clock signal
Of the ten digits expressing the number of samples, the value of the
upper five digits
Of the ten digits expressing the number of samples, the value of the
lower five digits
Equalizer boost amount (Display 2) and jitter ratio (Display 1)
Arming delay time (Display 2) and jitter ratio (Display 1)
IM 704610-01E
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