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Digital Oscilloscopes DS5500 SeriesWaveform Display & Analysis Functions
Analog Persistence Display Function
This function displays the waveform leaving the path of the trace for each sweep. This allows easy observation of the frequency information of signals like an analog oscilloscope. This display function is ideally suited for measuring amplitude such as jitter whose timing and amplitude varies along with time.
1. Persistence time (off, 100ms, 200ms, 500ms, 1s, 2s, 5s, 10s, ∞)
2. Color display (sungle/spectrum)
Applications
 Observation of jitter of digital signals
(allowing observation of the signal edge at which the signal state changes)  Observation of less repetitive signals
(setting persistence time to ∞)  RF signal observation such as light pickup
(observed with repetitive frequency information of the waveform)
■Waveform Observation of Memory Data Line
To visually observe fast changes Set persistence time to 100ms 

Frequency information can be observed with the spectrum display: Red: High frequency 
■Jitter Observation of Pulse Width
To visually observe min/max range of pulse width changes Set persistence time to ∞ 
Peak Detection Function
The peak detection function is for constantly displaying the min/max range of a signal at 1ns resolution. This function allows rigid measurement of signals that slowly chang a long time interval, even when 1ns pulse width noise is combined on the signal. The following example shows the comparison in waveform observation that can be achieved.
Applications
 Observation of noise combined motor rotation signal
 Observation of noise on switching power supply
Using normal sampling missing short period noises (sampling speed: 5MS/s) 
Using the peak detection function capturing every 1ns noise (sampling speed: 5MS/s) 
Automatic Waveform Parameter Measurement Functions
These functions measure the various waveform parameters, such as signal frequency, amplitude, and timing, and output them as numerical values. Automatic measurement is possible by using the function in conjunction with the cursor function and specifying the range of the measuring period. Furthermore, the maximum and minimum values of the measurement results can be obtained. Up to four waveform parameters can be displayed simultaneously.
Applications
 Signals whose frequency and/or amplitude varies with time, which are difficult to measure with the cursor function
■Measurement of Cycle RMS of the Burst Waveform (1Vrms)
This function is useful because it allows automatic measurement of burst waveforms in cycles instead of RMS within the measurement section. 
Name  Display Name  Icon  Measurement Condition (within the measurement section) 

Maximum value  Maximum  Maximum value within the measurement section  
Minimum value  Minimum  Minimum value within the measurement section  
Peaktopeak value  PeakPeak  Difference between maximum value and minimum value within the measurement section  
Root mean square (RMS) value  RMS  RMS value within the measurement section  
Cycle root mean square (RMS) value  Cycle RMS  RMS value in duty cycle within the measurement section  
Mean value  Mean  Mean value within the measurement section  
Cycle mean value  Cycle Mean  Mean value in duty cycle within the measurement section  
Top value  Top  Top value of amplitude probability density distribution within the measurement section  
Base value  Base  Base value of amplitude probability density distribution within the measurement section  
Topbase value  TopBase  Difference between the base and top within the measurement section  
+ Overshoot value  + Overshoot  Value of the overshoot at the first rise within the measurement section  
 Overshoot value   Overshoot  Value of the overshoot at the first fall within the measurement section 
■Measurement of the Number of Positive Pulses of the Pulse Train
This function can be applied for counting the number of drive pulses of a stepping motor, etc. 
Name  Display Name  Icon  Measurement Condition (within measurement period) 

Rise time 2080% 
Tr 20‐80%  Transition time of rise from 20% to 80% of the topbase of the waveform  
Fall time 2080% 
Tf 20‐80%  Transition time of fall from 80% to 20% of the topbase of the waveform  
Rise time 1090% 
Tr 1090%  Transition time of rise from 10% to 90% of the topbase of the waveform  
Fall time 1090% 
Tf 1090%  Transition time of fall from 90% to 10% of the topbase of the waveform  
Frequency  Frequency  Frequency from the first rise until the last rise  
Period  Period  Time from the first rise until the last rise  
Number of positive pulses  No.of +Pulse  Number of pulses, using the first rise to the first fall as the unit  
Number of negative pulses  No.of －Pulse  Number of pulses, using the first fall to the first rise as the unit  
Positive pulse width  ＋Pulse Width  Time from the first rise to the first fall  
Negative pulse width  －Pulse Width  Time from the first fall to the first rise  
Duty cycle  Duty Cycle  + cycle ratio in relation to 1 cycle 
■Measurement of Skew (Time Difference) Between Two Signals
This is an example of measuring the propagation delay of logic devices. 
Name  Display Name  Icon  Measurement Condition (within measurement period) 

Integral  Integral  Integral of the waveform relative to GND  
Skew  Skew  Time difference between two waveform edges  
Skew@Level  Skew@Level  Time difference between two waveform edges using absolute voltage at the measurement point 
Waveform Computation Functions
These functions allow addition, subtraction, and multiplication of two waveforms, as well as frequency analysis (FFT) of signal waveforms.
The calculated waveforms can be saved as data file. These calculation results can be used as a source for automatic waveform parameter measurement.
Applications
 Addition (+), subtraction ()
Evaluation of the differential signal of serial interfaces  Multiplication (x)
Evaluation of power waveforms from the multiplied voltage waveform by current waveform (calculation of electric energy using waveform parameters)  FFT
Frequency domain analysis of noise, vibration, etc.
Measurement of differential serial data signals (CH1: D+, CH2: D measurement and calculation of difference)  Frequency spectrum of voltage waveforms (Measurement and FFT operations of switching voltage waveforms) 
Reference (Waveform/Setting) Function
Reference waveforms can be displayed on the screen for the comparative evaluation of newly acquired waveforms.
Up to five reference waveforms can be saved.
The measured waveforms and panel settings can be saved at the same time. As a result, waveforms saved in the past as well as the panel settings can be easily recalled, reproducing previous measurement conditions smoothly.
Applications
 Comparative measurement of transient waveforms (step response measurement of devices)
 Comparative measurement of the frequency spectrum
 Multiple measurement of predefined measurement conditions
(Waveforms and settings can easily be saved to and individually recalled from internal memories REF1 through REF5)
Comparative measurement of transient waveform  Comparative measurement of frequency spectrum 
XY Trigger Display Function
In addition to normal XY display, XY triggered display that traces the XY waveform each time a trigger is detected is also supported.
Even signals that occur intermittently over a long time can be displayed.
Applications
 Measurement of phase shifts of two signals included on burst signals
 Measurement of rotary encoder output (rotation angle versus output)
Rescale Function
This function allows unit conversion for direct reading of the output voltage signal measured with the following devices.
 Current probe
 Shunt resistor
 Sensors of various types
Replay Function
Up to 2,048 pages of previously captured waveforms are automatically saved by selected memory length per page up to 1M points. Since the saved historical waveforms can be replayed later, this function is very useful, for example for verifying abnormal waveforms. Waveforms that have been saved in the past are overwritten reciprocally from the oldest one with newly captured waveforms.
Application
Verification of abnormal signals from repetitive signals
As long as the waveform memory length is used shorter than 1M points during capture, entire historical waveforms can be replayed.