6-12
IM DLM4038-03EN
Computation, Analysis, and Searching
Item
Specifications
Computation
Four computations can be performed, using MATH1 to MATH4.
Waveform source waveforms are as follows:
Math1: CH1 to CH4
Math2: CH1 to CH4, Math1
Math3: CH5 to CH8
Math4: CH5 to CH8, Math3
The maximum computable record length is as follows:
Standard model: 6.25 M points
/M1 option: 25 M points
/M2 option: 62.5 M points
/M3 option: 125 M points
The following computation types are available.
Standard model:
Operators
+, –, x, Filter, Integ, Count(Edge/Rotary)
User-defined computation (/G2 or /G4 option):
Expressions can be created by combining the following operators and constants.
Operators:
+, –, *, /, ABS, SQRT, LOG, LN, EXP, P2, SIN, ASIN, COS, ACOS, TAN, ATAN,
PH, DIFF, INTEG, FILT1, FILT2, HLBT, MEAN, DELAY, BIN, PWHH, PWHL,
PWLH, PWLL, PWXX, FV, DUTYH, DUTYL, DA
Constants:
K1 to K4, 0 to 9, PI, e, fs, 1/fs, Exp, Measure
FFT
Two FFT (Fast Fourier Transform) waveforms, FFT1 and FFT2, can be displayed.
Analysis source waveforms: CH1 to CH8, Math1 to Math4
Analysis range: Main, Zoom1, Zoom2
FFT Points: 1.25 k, 2.5 k, 12.5 k, 25 k, 125 k, 250 k points (samples the waveform in the analysis
range using the specified number of FFT points)
Time windows: Rectangular, Hanning, and flattop
FFT waveform display modes: Normal, Max Hold, Average
On models with the user-defined computation option, the FFT’s Type and Sub type settings can be
selected.
Type: LS-, RS-, PS-, PSD-, CS-, TF-, CH-
Sub type: MAG, LOGMAG, PHASE, REAL, IMAG
Reference waveforms
Four reference waveforms, REF1 to REF4, can be displayed
Saved waveforms and channel waveforms can be loaded into REF1 to REF4.
Ref1 to Ref4 use the Math1 to Math4 traces, respectively. Therefore, Ref and Math cannot be
used simultaneously. Maximum record length at which reference waveforms can be used is the
same as the maximum record length at which computation is possible. For details on the maximum
computable record length, see “Computation” two items earlier.
Waveform searching
Searches the displayed waveform for locations that meet the specified conditions and displays the
waveform expanded around the detected points. Up to 50000 points can be detected within the
specified search range.
Search start and end points: Can be set within ±5 div. If the search type is not set to Edge or
Pulse Width, End Point is fixed at +5 div.
Search Types: Edge, Edge Qualified, State, Pulse Width, State Width
Serial bus signal analysis*
FlexRay, CAN, CAN FD (ISO 11898-1: 2015 or non-ISO), LIN, CXPI, SENT, PSI5 Airbag, UART,
I
2
C, SPI, and user-defined serial bus data can be analyzed and displayed. The DLM4000 can
decode frames, fields, and other information from the waveform displayed on the screen. Then,
it can display the decoded results and the waveform together on the screen or display a list of
detailed decoded results. For SENT and PSI5 Airbag signals, trend display is also possible.
By performing a search, you can display an expanded waveform with the detected frame’s or field’s
first data byte at the center of the window. The DLM4000 can analyze and search the waveforms
of up to four serial bus signals. The DLM4000 can search up to 50000 points on the selected serial
bus signal.
History waveform display
and searching
You can display one waveform or all history waveforms overlapped and list the timestamps of the
waveforms.
You can search for waveforms that meet specified conditions, display detected history waveforms,
and list the timestamps of the waveforms.
Search conditions: Up to 4
Search logic: Select Simple or the AND or OR of four search conditions. Simple sets the search
condition to waveforms entering a rectangular zone.
Search criterion: The source waveform enters the search range (IN), moves outside the search
range (OUT), or don’t care (X)
Search range type: Select from the following:
RectZone: Rectangular zone. Cannot be used on FFT waveforms.
WaveZone: Waveform zone. Cannot be used on XY or FFT waveforms.
PolygonZone: Polygonal zone. Cannot be used on FFT waveforms.
Parameter: Zone between the upper and lower limits of one waveform parameter.
* FlexRay, CAN, CAN FD, LIN, CXPI, SENT, PSI5, UART, I
2
C, and SPI are options.
6.5 Features
