Performing Numerical Calculations

There are two methods for performing numerical calculations:

  • Performing calculations during measurement (real-time automatic calculations)

    Configure the desired numerical calculations and start measurement. Calculations will then be performed in real time during measurement.

    You can review the most recent numerical calculation results on the [Wave+Value] waveform screen.

  • Performing calculations after measurement (manual calculations)

    Use the instrument’s control keys to start the calculation after measurement has completed.

 

Performing calculations during measurement

(Real-time automatic calculations)

 

Performing calculations after measurement

(Manual calculations)

   

Numerical calculation settings are configured before starting measurement.

Calculations are performed in real time during measurement.

  • You can review the most recent calculated values on the waveform screen ([Wave+Value] display).

  • You can also save calculated values for each interval in text format.

Numerical calculation settings are configured, and calculations performed, after measurement.

Real-time numerical calculations (automatic calculations)

Numerical calculations after measurement (manual calculations)

   

 

Measurement stop

 

[Calculation] > [Numerical] screen

[Calculation] > [Numerical] screen

Under [Numerical calculation], set the function to [ON] and select the type of calculation.

Under [Numerical calculation], set the function to [ON] and select the type of calculation.

If you wish to save calculation results automatically

 

[Measure] > [Auto save] screen

[Wave+Value] screen

Enable auto saving.

Perform calculations

“Auto save (real-time save)” in “3.3 Saving Data” in the Instruction Manual.

  

 

Start measurement

 

Observe data

Observe data

 

In the following instances, calculated values and saved data are treated as described in “11.15 Data Handling” in the Instruction Manual.

  • When the waveform significantly exceeds the range’s measurement scope (+OVER, -OVER)

  • When the instrument detects a thermocouple wire break during temperature measurement (wire break detection)

 

If data acquired across the calculation target channel includes the [NO DATA] points, which resulted from communications disruption or other reasons, the data will be exempted from the calculation target.

If data in the calculation range is occupied by the [NO DATA] points, the string [NO DATA] is displayed on the instrument’s screen, and the numerical calculation result [1.7976931348623157e+308] will be saved.

Configuring numerical calculations

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1 Under [Numerical calculation], set the numerical calculation function to [ON].

OFF ☑, ON

2 Under [Time split calculation], select the file saving method used for the auto-save.

Disable ☑

Performs the numerical calculation using all data acquired from the measurement start to the measurement stop, and then saves the calculation results.

Enable

Segments the data set into those with a length of the set interval beginning from the measurement start*1, performs calculations using the segmented data sets, and saves the calculation results by interval basis.

  1. *1

    When the trigger setting is enabled, segments the data set beginning from the start trigger point.

Timed

The first interval length will automatically be adjusted so that calculation values yielded at regular intervals ([Split time]) base on the [Reference time] are saved. (Only the first interval will become shorter than the [Split time].)

If the [Enable] or [Timed] setting has been selected, calculation results will be saved for each time interval.

When the numerical calculation result type for the auto-save is set to [OFF], the [Time split calculation] setting is disabled.

“Auto save (real-time save)” in “3.3 Saving Data” in the Instruction Manual.

Set the format for numerical calculation results to [Text (CSV)].

 

(When [Time split calculation] is set to [Enable])

Under [Split time], set the time interval at which to perform the calculation.

0 days 00:01 to 30 days 23:59

For example, if the segment time is set to 10 min., the calculation will be performed, and the calculation results saved, every 10 min.

Calculation results will be saved at the specified intervals based on the reference time.

The value 0 d 0 h 0 min. cannot be specified as the segment time.

The value will be automatically changed to 0 d 0 h 1 min.

 

(When [Time split calculation] is set to [Enable])

Under [Reference time], set the time to use as the reference when segmenting files

Hour (0 to 23), min. (0 to 59)

Under [Split time], set the interval at which to segment files.

1 min, 2 min, 5 min, 10 min☑, 15 min, 20 min, 30 min, 1 h, 2 h, 3 h, 4 h, 6 h, 8 h, 12 h, 1 d

Calculation results will be saved at the specified interval starting at the reference time.

The initial interval after the start of measurement will be automatically adjusted so that results are saved at the segment time as measured from the reference time.

3 Under [Type], select the type of numerical calculation.

You can set up to 10 numerical calculations at the same time.

Average

Calculates the average value.

P-P

Calculates the difference between the minimum and maximum values (the peak-to-peak value).

Maximum

Calculates the maximum value.

Minimum

Calculates the minimum value.

Time to max

Calculates the time from the start of recording until the maximum value. *1

Time to min

Calculates the time from the start of recording until the minimum value. *1

Aggregation

Calculates the integrated value.

Integration

Calculates the integral value.

Usage ratio

Calculates the rate at which the measured value is greater than the threshold value.

ON time

Calculates the total time for which the measured value is greater than the threshold value.

OFF time

Calculates the total time for which the measured value is less than the threshold value.

ON count

Calculates the number of times the measured value crosses the threshold value in the rising direction.

OFF count

Calculates the number of times the measured value crosses the threshold value in the falling direction.
  1. *1

    Calculates the time from the trigger point when the trigger is used.

Only one threshold value can be set for each channel. If you specify the same channel for the ON and OFF time, the same threshold value will be used.

4 Under [Target CH], select the channel for which to perform the numerical calculation.

All CH ☑

Performs the numerical calculation using waveforms for all channels. Set the threshold value on the channel screen.

Unit n

Performs the numerical calculation using the waveform for the specified channel only.

(n = 1, 2, ...)

Pulse

Performs the numerical calculation for a pulse waveform. (P1 to P8)

Wave calc

Performs the numerical calculation using a waveform generated by a waveform calculation. (W1 to W30)

5 (When [Target CH] is set to a value other than [All CH])

Set the individual channel for which the calculation is to be performed.

6 (When [Type] is set to [Usage ratio], [ON time], [OFF time], [ON count], or [OFF count])

Under [Threshold], set the reference value.

“Value entry method” in “1.1 Performing Basic Operations” in the Instruction Manual.

7 (When [Type] is set to [Aggregation] or [Integration])

Select the calculation method.

“Numerical calculation formulas” in “6.1 Performing Numerical Calculations” in the Instruction Manual.

Total ☑

Calculates the difference between the integration or area enclosed by the zero position and the part of the signal waveform where its amplitude is positive and the integration or area enclosed by the zero position and the part of the signal waveform where its amplitude is negative.

Positive

Calculates the integration or area enclosed by the zero position and the part of the signal waveform where its amplitude is positive.

Negative

Calculates the integration or area enclosed by the zero position and the part of the signal waveform where its amplitude is negative.

ABS

Calculates the integration or area enclosed by the zero position and the signal waveform.

 

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8 (When saving the numerical calculation results)

Auto saving: Configure the settings in the [Numerical calculation results] area.

“Auto save (real-time save)” in “3.3 Saving Data” in the Instruction Manual.

Manual saving: Under [Type], select [Calc results].

“Manual saving (selective saving, immediate saving)” in “3.3 Saving Data” in the Instruction Manual.

Real-time numerical calculations (automatic calculations)

This section describes how to perform numerical calculations while measurement is in progress.

It also describes how to review calculation results at a given point in time on the [Wave+Value] screen during measurement.

1 Configure the numerical calculation.

Configuring numerical calculations

2 Press the START key to start measurement.

Numerical calculations will be performed in real time.

3 Press the WAVE key to display the [Wave+Value] screen.

4 Set the numerical display on the right side of the screen to [Calc].

The numerical calculation results will be displayed, allowing you to review the calculation results at any given point in time.

5 Select a numerical calculation of which you wish to display the result.

You can select a numerical calculation of which you wish to display the result from among [Calc 1] through [Calc 10].

6 (When [Time split calculation] is set to [Enable]) Select a numerical calculation of which you wish to display the result.

Normal ☑

Displays the values calculated using data from the start of measurement.

Split

Displays the calculated values updated at regular intervals.

When [Split] have been selected, the first segmented time (can be changed to the date or number of data points under [Display horizontal axis]) will be displayed underneath the calculation results table.

7 Switch the channel using the [<] and [>] keys (as necessary).

You can change the channel for which to display calculation results.

Numerical calculations after measurement (manual calculations)

This section describes how to use the instrument’s control keys to perform numerical calculations after measurement.

You can review calculation results by displaying the [Wave+Value] screen and then setting the numerical display on the right side of the screen to [Calc].

1 Press the START key to start measurement.

2 Once measurement completes, configure the numerical calculation.

Configuring numerical calculations

3 Press the WAVE key to display the [Wave+Value] screen.

4 Set the numerical display on the right side of the screen to [Calc].

The numerical calculation’s settings will be displayed.

5 Press the ENTER key while [Execute] is selected.

The numerical calculation set in step 2 will be performed.

 

Numerical calculations can also be performed using waveforms that have been loaded from media (an SD Memory Card or a USB Drive). Once the waveform has been loaded, proceed to step 2 above.

 

Time split calculation cannot be performed manually.

Partial numerical calculations

If performing manual calculations, you can specify the range over which to perform the calculation.

The numerical calculation will be performed after the range has been specified with the A/B cursors (vertical).

1 Specify the range with the A/B cursors.

“Specifying a waveform range” in “1.14 Using the A/B Cursors” in the Instruction Manual.

2 Set the numerical display on the right side of the screen to [Calc].

The numerical calculation’s settings will be displayed.

3 Select the range over which to perform the calculation.

All ☑

Performs the calculation using the waveforms for the entire recorded length, without regard to the A/B cursors.

A-B

Performs the calculation using the waveforms between the A and B cursors.

Start-A

Performs the calculation using the waveforms from the beginning to the A cursor.

Start-B

Performs the calculation using the waveforms from the beginning to the B cursor.

A-End

Performs the calculation using the waveforms from the A cursor to the end.

B-End

Performs the calculation using the waveforms from the B cursor to the end.

4 Press the ENTER key while [Execute] is selected.

The numerical calculation will be performed over the range specified in step 3.