1-37
IM 253710-01E
Functions
1
1.8
Waveform Analysis
The displayed waveform can be added or subtracted. A FFT can be performed to
display the power spectrum. Furthermore, a cursor can be placed on the waveform to
measure the value at that point.
Waveform Computation «For procedures, see section 11.2.»
An equation can be created by combining the symbols of each channel and operators.
The resultant waveform of the equation can be displayed. Two types of equations can
be created using the operands, C1 through C8, that correspond to CH1 through CH8.
Up to 16 operands can be used in one equation. The starting and ending points can be
specified, and the computation is performed over that region.
The operators are +, –,
∗
, /, ABS (absolute value), SQR (square), SQRT (square root),
LOG (logarithm), LOG10 (common logarithm), EXP (exponent), NEG (minus sign), DIF
(differentiation, applicable to products (PZ4000) with firmware version 2.01 or later).
TINTG, TREND, AVG, SSP, SLIP, PM are available as special functions. TINTG is
counted as two operands.
TINTG
The sampled data are integrated according to the following equation.
x
n
= x
n–1
+ d
n
×
t
x
n
: nth display data. (The first display data, x
1
, is d
1
×
t.)
x
n–1
: n–1th display data that has been integrated.
d
n
: nth sampled data.
t : sampling period (inverse of the sampling rate). When the time base is set to
external clock or when the measurement mode is harmonic, t = 1 s.
TREND
The instantaneous value (sampled data) of the measured signal can be computed (in
the same fashion as determining each measurement function) for each cycle of the
synchronized signal, and the TREND waveforms of the following measurement
functions can be displayed.
Measurement Function that
Applicable Function
Channel Symbol Placed
Can Be Computed
Inside the Parentheses
True rms value and active power
TREND( )
C1, C2, C3, C4, C5, C6,
(Urms, Irms, and P)
C7, C8, C1
∗
C2, C3
∗
C4,
C5
∗
C6, C7
∗
C8
Rectified mean value calibrated
TRENDM( )
C1, C2, C3, C4, C5, C6,
to the rms value (Umn and Imn)
C7, C8
Simple average (Udc and Idc)
TRENDD( )
C1, C2, C3, C4, C5, C6,
C7, C8
Frequency (fU and fI)
TRENDF( )
C1, C2, C3, C4, C5, C6,
C7, C8
*
Functions TRENDM, TRENDD, and TRENDF are applicable to products (PZ4000) with
firmware version 2.01 or later.
The synchronizing signal varies depending on the channel symbol that is entered in
the parentheses of each function.
Channel Symbol
Synchronizing_ Signal
C1, C2, C1
∗
C2
Signal selected for ELEMENT1 in the zero crossing setting of the
measurement/computation period.
C3, C4, C3
∗
C4
Signal selected for ELEMENT2 in the zero crossing setting of the
measurement/computation period.
C5, C6, C5
∗
C6
Signal selected for ELEMENT3 in the zero crossing setting of the
measurement/computation period.
C7, C8, C7
∗
C8
Signal selected for ELEMENT4 in the zero crossing setting of the
measurement/computation period.
*
If the motor module is installed in slot 4, C7, C8, C7
∗
C8 cannot be specified.