MR8740、MR8741_user_manual_eng_20191016H.pdf - 第228页
9.2 Settings for Numerical Value Calculation 216 Parameter t able ____________ ____________________________________ Calculation Type Pa rameter Parameter description Period Frequenc y Pulse Width Pulses Duty Ratio* Time …
9.2 Settings for Numerical Value Calculation
215
Chapter 9 Numerical Calculation Functions
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9
(2)
Select the channel for calculations.
Move the flashing cursor to the item for the calculation tar-
get, and select the channel.
(A logic channel can also be selected for Time to Level, Pulse Width, Duty
Cycle, and Pulse Count.)
(3)
Set parameters.
Settings may not be necessary for some calculation types
When calculating time differences and phase contrast,
makes settings for A and B channels.
Move the flashing cursor to the parameter items, and make
appropriate parameter settings.
See: "Parameter table" (p.216)
See: "7.1.3 Alphanumeric Input" (p.141)
(4)
Set the statistical calculation.
Move the flashing cursor to the [Stat] column.
Select
(5)
When time difference calculation or phase contrast cal-
culation has been selected, set Ch (channel) and param-
eters for A and B.
4
Execute the calculations. (when judging calculations
(p.218))
Applying Calculations to Existing Data
Select [Exec].
When calculating automatically after measurement
Click [START] to start measurement.
First Calculate at the first condition of the measurement data.
Average Acquire the average value of the calculation result in the
measurement data.
Max Acquire the maximum value from the calculation result in
the measurement data.
Min Acquire the minimum value from the calculation result in
the measurement data.
When saving calculation results during
measurement
Settings must be made before the mea-
surement.
See: "9.4 Saving Numerical Calculation
Results" (p.221)
When saving existing data
Click [SAVE].
See: "4.2.3 Saving Data Selectively
(SAVE)" (p.93)
To copy a calculation setting to another calculation number
Use the [Num Calc] sheet.
See: "7.8 Copying settings to other channels (calculation No.) (Copy function)" (p.160)
9.2 Settings for Numerical Value Calculation
216
Parameter table________________________________________________
Calculation Type Parameter Parameter description
Period
Frequency
Pulse Width
Pulses
Duty Ratio*
Time Diff
Phase Diff
*: Level and
Filter only
L (Level) Calculation is based on the interval (time) when this level is crossed.
F (Filter)
Only when the measurement signal has crossed the level and has not crossed the
level again within the specified filter width, it is taken as a valid event. This is useful
to exclude level crossing events due to noise.
S (Slope(, ))
Calculation is based on the interval (time) when the level is crossed.
Depending on this setting, either crossing on the upward slope () or downward
slope () is used for calculation.
Risetime
Falltime
P (%)
Determines which section of the waveform between the upper and lower limits is
used for risetime (or falltime) calculation. The range is narrowed from the upper and
lower limit values by the percentage set here.
Time to Lev
L (Level) Calculates the time specified level is crossed.
F (Filter)
Only when the measurement signal has crossed the level and has not crossed the
level again within the specified filter width, it is taken as a valid event. This is useful
to exclude level crossing events due to noise.
S (Slope(, ))
Determines whether the time is calculated until the signal crosses the specified lev-
el on the upward slope or on the downward slope.
Lev-Time
Time or Measure (Calcula-
tion results)
Specifies the time for calculating the measurement value, using the trigger position
as zero.
To use the numerical calculation result, specify the numerical calculation number.
The range specified by A/B cursors is not available.
Calculation
Numerical Calculation No. Sets the numerical calculation number.
+, - , ×, ÷ Sets the operators for the four arithmetic operations.
• Depending on the signal waveform, calculation values for the Period, Fre-
quency, Risetime, and Falltime parameters may not be displayed.
• When Scaling is enabled, the waveform data are scaled before numerical cal-
culation. The units for parameter values are derived from the units set for the
Scaling function.
See: About Scaling: "7.4 Converting Input Values (Scaling Function)" (p.148)
9.2 Settings for Numerical Value Calculation
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Chapter 9 Numerical Calculation Functions
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Numerical calculation results are displayed on the Waveform screen
9.2.1 Displaying Numerical Calculation Results
Calculation
Results
If the display is hard to view because of
overlapping numerical values and wave-
forms
Switch the waveform display width in the [DISP]
menu.
Numerical values and waveforms are displayed
separately.
See: "6.7.3 Switching the Waveform Display Width"
(p.135)
To save calculation results after measuring:
Set the [Select at save] item to [Yes]. When you click [SAVE] after measure-
ment, you can select the content to be saved. (Select [Calc Result].)
See: "4.2.3 Saving Data Selectively (SAVE)" (p.93)
If a numerical calculation that becomes invalid is performed using the data mea-
sured with MR8990 Digital Voltmeter Unit, the calculation result is displayed as
"******".