1-22
IM 701830-01E
User Defined Computation
≡
Page 9-19.
≡
You can define a computing equation by combining the following operators.
ABS(absolute value), SQR(square root), LOG(logarithm), EXP(exponent), BIN(binary
computation), PWHH(pulse width), PWHL(pulse width), PWLH(pulse width), PWLL(pulse
width), PWXX(pulse width), ATAN(arctangent), MEAN(moving average),
DIF(differentiation), DDIF(2nd order differentiation), INTG(integral), IINTG(double integral),
PH(phase), HLBT(Hilbert), P2(square), P3(cube), FILT1(digital filter), FILT2(digital filter),
LS-(linear spectrum), RS-(rms value spectrum), PS-(power spectrum), PSD-(power spectrum
density), CS-(cross spectrum), TF-(transfer function), CH-(coherence function), PHASE(phase),
REAL(real part), IMAG(imaginary part), LOGMAG(logarithm magnitude), MAG(magnitude),
SIN(sine), COS(cosine), TAN(tangent), F1(
C1
2
+ C2
2
), F2(
C1
2
– C2
2
), variable T.
In addition, you can average or compute the peak value on the computed data. Four operations
are available: linear, exponential, cycle, and peak.
Linear averaging
Simply sum the data for the average count (number of acquisitions, 2 to 128, 2
n
steps) and
divide by the average count. The resulting waveform is displayed. See page 1-12 for the
equation.
Exponential averaging
Determine the average value by attenuating the influence of past data using the specified
attenuation constant (2 to 256, 2
n
steps). The resulting waveform is displayed. See page 1-12 for
the equation.
Cycle averaging
Divide one period of computed data into the specified number of data points (Cycle Count). Do
this across multiple periods of data from the start to the end position of the computation.
Determine the average of the data points at the same position across multiple periods. The
resulting waveform is displayed. In the following example, the Cycle Count is set to 720 and the
result of the cycle average is displayed.
1
2
3
4 5 ••••••
721(1)
722(2)
723(3)
724(4) 725(5) ••••••
1441(1)
1442(2)
1443(3)
1 721 1441
............
<Computed data>
<Cycle averaging result>
Determine the simple average of the data points at the same position across multiple periods
and display the waveform.
720
1440
2160
.......
720
1440(720)
1 period
1 period
••••••••••••
Peak computation
Determine the maximum value at each point of the computed data and display the waveform.
For each computation, the new computed value is compared with the past value and the larger
value is kept.
Three FFT data
Display the maximum value at each point
1.5 Analyzing the Waveform
