9-18
IM DLM6054-01EN
Constants
Menu Item Description
K1 to K4 Constants
0 to 9 –
Exp E notation
Used to enter a number in scientific notation in expressions.
(1E+3 = 1000, 2.5E-3 = 0.0025)
It is displayed as “E” in expressions to distinguish it from the “EXP” operator.
PI
Pi (
π
)
e Euler’s number (Napier’s constant)
Base of the natural logarithm (e=2.71828...).
It is displayed as “eul” in expressions to distinguish it from the “E” that represents exponents.
fs The sample rate.
The DL6000/DLM6000 sample rate at the time that computation is executed. The value
changes in accordance with changes in the time axis and record length settings.
1/fs Number of samples per second.
Computed based on the DL6000/DLM6000 sample rate when computation is executed.
The value changes in accordance with changes in the time axis and record length settings.
Measure Item A waveform parameter value can be used. Example: P.Max(C1)
Automated Measurements of Waveform Parameters (Measure)
You can use the automated measurements of waveform parameters in expressions.
• “P.” precedes waveform parameters when they are displayed in expressions.
• The DL6000/DLM6000 cannot retrieve waveform parameter values when the display of the
measurement source waveform is off.
Computation Conditions (Setup)
You can configure constants (K1 to K4) and the digital filter and turn computation averaging on or off.
Constant Definitions (Constant)
Set a value for K1 to K4. This setting applies M1 through M4.
Settable range: –10E+30 to 10E+30
Digital Filter Definitions (Filter1/Filter2)
When using FILT1 or FILT2 in user-defined computation, set the digital filter’s filter type, frequency
band, and cutoff frequency. This setting applies M1 through M4.
• Filter Type (Type)
Select the filter type from one of the options below.
• IIR: Non-linear phase. Achieves adequate cutoff characteristics even at relatively low orders.
• FIR: Linear phase. Takes longer than IIR to process.
FIR (low pass; 10% cutoff)
IIR (low pass; 10% cutoff)
9.10 Performing User-Defined Computations (Optional)
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