MR8740、MR8741_user_manual_eng_20191016H.pdf - 第227页

9.2 Settings for Numerical Value Calculat ion 215 Chapter 9 Numerical Calculat ion Functions 8 9 (2) Select the channel for calc ulations. Move the flashing cursor to the item for the calculation tar- get, and select the…

9.2 Settings for Numerical Value Calculation

214

9.2 Settings for Numerical Value Calculation

Procedure

To open the screen: Right-click and select [STATUS]  [Num Calc] sheet

Enable the Numerical Calculation function.

Move the flashing cursor to the [Numerical Calc] item.

Select [On].

Specify the Numerical Calculation range.

Move the flashing cursor to the [Calc Area] item.

Select

See: "6.2 Specifying a Waveform Range (A/B Cursor)" (p.124)

Perform calculation settings.

(1)

Select the calculation type.

Move the flashing cursor to the number of the calculation type

for which to make settings, and select the calculation type.

(When you select [List] a list of calculation types appears.)

WholeWave Applies calculations to the whole

waveform. (default setting)

A-B Wave Applies calculations to the data be-

tween A/B cursors.

AfterTrigger Applies calculations to the waveform

after a trigger.

.Calculation No.

Calculation

Type

(1) (2) (3)

Parameters*

*: Setting choices depend

on the calculation type.

Channel for

Calculation

(4)

Statistical

calculation

(5)

Phenomenon

*2: Setting can also be made for logic channels

X-Y Area*

Area of X-Y composite waveform

Time to Lev*

Time from trigger to specified level

Lev-time Measurement value at a specified time

point after triggering

Pulse Width*

Pulse width of waveform data

Duty Ratio*

Duty of waveform data

Pulses*

Pulse count of waveform data

Calculation Four arithmetic operations on numerical

calculation results

Time Diff*

Time difference between phenomenon A

and B.

Phase Diff*

Time difference between phenomenon A

and B displayed as a phase contrast.

High Level*

High level value for waveform data

Low Level*

Low level value for waveform data

*1: Calculation performed with MR8990 Digital Volt-

meter Unit is invalid. The indication of the calcu-

lation result becomes "******".

Off No calculation. (default setting)

Average Average value of waveform data

Rms*

RMS value of waveform data

Peak-Peak Peak-to-peak value of waveform data

Maximum Maximum value of waveform data

Max-Time Time from trigger to maximum value

Minimum Minimum value of waveform data

Min-Time Time from trigger to minimum value

Period*

Period of signal waveform

Frequency*

Frequency of signal waveform

RiseTime*

Rise time of waveform data

FallTime*

Fall time of waveform data

Std Dev*

Standard deviation of waveform data

Area*

Area enclosed by zero position and

signal waveform

When selecting [A-B Wave], specify the

calculation range using the A/B cursors on

the Waveform screen.

If no measurement data has been ac-

quired by the instrument, first measure

once so that the range can be specified for

calculations to be applied to subsequent

measurements.

Also select [Judge] if you require judg-

ment of calculation results.(p.218)

9.2 Settings for Numerical Value Calculation

215

Chapter 9 Numerical Calculation Functions

(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.

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)