Performing Waveform Calculations

This section describes how to perform basic arithmetic operations between channels and how to calculate values such as a moving average. (Up to 30 calculations can be performed.)

The following types of calculations are available: basic arithmetic operations, integration, simple average, moving average, and integral.

Calculations are performed in real time while measurement continues, and post-calculation waveforms are displayed.

Waveform calculations cannot be performed after measurement.

Waveform calculation results are displayed in the calculation channels ([W1] to [W30]).

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1 Select the item to display.

Formula ^☑, Display, Comment, Numerical calc

Calculation list screen: [Display]

Calculation list screen: [Comment]

Calculation list screen: [Numerical calc]

2 You can cycle through the calculation channel to display.

Press the ENTER key while [16-30>] is selected to display W16 to W30.
Press the ENTER key while [1-15>] is selected to display W1 to W15.

3 Select the check boxes for the channels for which you wish to perform calculations.

4 Select the waveform display color.

× (OFF), 24 colors

Select [×] if you wish to perform the waveform calculation but not to display the waveform on the screen.

5 Select a calculation channel and press the ENTER key.

The individual settings window will open.

You can specify the calculation channel, toggle waveform calculation on and off, and set the waveform display color.

6 Press the ENTER key while [Formula] is selected.

The waveform calculation entry window will open.

7 Set the type of the waveform calculation.

Four arithmetic ^☑	Performs between channels addition, subtraction, multiplication, and division. This setting allows you to enter channels, coefficients, and constants. (You can also set exponents as constants.) If division by zero is found, the calculation will result in 1.797693e+308.
Aggregation	Adds the measurement data and plot its sum total. Set the channel, [Reset start time], and [Reset time].
Simple average	Adds and average all measurement data from the start of measurement and plots the results. Set the channel, [Reset start time], and [Reset time].
Moving average	Calculates the average using the specified number of points while moving. Perform averaging processing using the specified number of points for each sampled data point and plots the results. Set the channel, and [Number of points].
Integration	Adds values obtained by multiplying measurement data by the sampling period and plot the sum total. Set the channel, [Reset start time], and [Reset time].

8 (When [Four arithmetic] is selected)

Specify constants, target channels, and operators.

Calculation expression = (A ∗ CHa □ B ∗ CHb □ C ∗ CHc □ D ∗ CHd) ■ E

A, B, C, D, E: User-specified constants

CHa, CHb, CHc, CHd: User-specified measurement channels (up to 4 channels)

□：	Any one operation sign of plus (+), minus (-), multiplication (∗), or division(/) or a blank character. If entering a blank character, you cannot enter any further terms in the parentheses.
■：	Any one operation sign of plus (+), minus (-), multiplication (∗), division(/), or exponentiation (^) or a blank character. If entering a blank character, you cannot enter a constant.

The operator, caret (^) indicates exponentiation.

Example: To write an expression (A∗CH1)², enter (A∗CH1)^2.

You can select a calculation channel as a target channel; however, you cannot select a calculation channel with a number that is larger than the number of the configured calculation channel.

Example: You can set [W1] through [W4] as the calculation channel for [W5].

9 (When [Type] is set to [Aggregation], [Simple average], or [Integration])

Under [Reset start time], select the reset operation to perform when measurement starts.

OFF ^☑	Does not reset calculation results.
Trigger position	Resets calculation results when a trigger activates.

10 (When [Type] is set to [Aggregation], [Simple average], or [Integration])

Under [Reset time], select when to perform reset operation.

Disable ^☑	Does not reset calculation results.
Enable	Resets calculation results at the set time intervals.
Timed	Resets calculation results at the set intervals starting at the specified time.

11 (When [Reset time] is set to [Enable])

Set the [Reset interval].

(When [Reset time] is set to [Timed])

Set the [Reference time] and [Reset interval].

12 Configure display settings.

1	Upper	Upper limit value when displaying waveform calculation results on the screen
2	Lower	Lower limit value when displaying waveform calculation results on the screen
3	Num of decimal places	Number of decimal places for measured values This setting is not displayed when [Number display format] is set to [Standard].
4	Unit	Unit for waveform calculation results
5	Comment	Comment for each calculation channel
6	Numerical threshold	Threshold value for numerical calculations (Availability, ON time, OFF time, ON count, OFF count)

Threshold values are used for numerical calculations.

Configuring numerical calculations