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What are the Types of Excitations? And What is Excitations in Spectral acquisition.?

Experimenter
Experimenter

 What are the Types of Excitations? And What is Excitations in Spectral acquisition.? 

3 REPLIES

Re: What are the Types of Excitations? And What is Excitations in Spectral acquisition.?

Siemens Legend Siemens Legend
Siemens Legend

Hi,

Spectral acquistion, do you mean spectral testing?  In Test.Lab spectral Testing module with source control add in selected, you'll have signal type: sine, random, burst random, burst sine, periodice chirp.

 Picture1.jpg

Once you select the signal type, then you can select signal voltage from zero to 10 Volt.

Hong

Re: What are the Types of Excitations? And What is Excitations in Spectral acquisition.?

Experimenter
Experimenter

Dear Sir,

              could you please explain each type in detail ?

Re: What are the Types of Excitations? And What is Excitations in Spectral acquisition.?

Siemens Phenom Siemens Phenom
Siemens Phenom

Hello,

 

In Spectral Testing, on the Scope worksheet press the ? in the top right corner to acccess the Help on that particular worksheet.  Under the Sources Control panel, each of the source outputs are described.  I've copied it here:

 

Signal Type

The type of source signal, which is currently selected, is shown in the check boxes at the top of the Sources Parameters dialog available from the More... button for that channel.

Note: The source type that is enabled here is the same as set in the Sources Control table. Any changes made here updates the signal type in the table in the worksheet.

Level (V)

This defines the signal level. For Sine, Burst Sine and Chirp signal, this corresponds with the amplitude of the signal. For Random and Burst Random, this corresponds with the maximum range of the output (actual peak value will always be lower than this value).

Random

You have the choice between 2 types of random signals: white noise and pink noise. You can select this using the radio button.

Note: It is only possible to define 1 pink noise source per output module. When you define a pink noise source when you already have one defined, the other one will automatically be set to white noise.

Frequency Definition

For white noise, the frequency range is defined by the minimum and maximum frequency values.

Relative

Relative values means that the frequency range will be updated whenever the Acquisition Bandwidth is changed.

Absolute

Absolute values means that the frequency range will always remain fixed.

Start/Stop Times

Settling time: Time after the build-up time and before the first average is taken. This time will be included in the throughput file (if time-recording is on).

Build Up: Time during which a gradual source build-up will be done. This will occur before the averaging and will not be included in the throughput file (unless the source are not set to ‘Synchronized Measurement’ in the ‘Measurement Control’).

Build Down: Time during which a gradual source build-down will be done. This will be done after the last average or when the measurement is stopped and will not be included in the throughput file (unless the source are not set to ‘Synchronized Measurement’ in the ‘Measurement Control’).

 

The settling time is the same for all sources. The Build Up and Build Down time is the same for all sources of one module.

Burst Random Definition

The source is a random signal but which drops to a zero level after a certain time. You have the choice between 2 types of random signals: white noise and pink noise. You can select this using the radio button.

Note: It is only possible to define 1 pink noise source per output module. When you define a pink noise source when you already have one defined, the other one will automatically be set to white noise.

Burst Random Checkbox

Check the box "on" to enable a burst random source signal.

Burst time

This value is the time (as a percentage of the acquisition time) for which the signal is to be applied.

Burst ramp time

This value determines the rate at which the desired signal level is attained and fades back to zero again. This value will automatically be limited to less than half of the burst time.

Sine

The source is a simple sine signal at one specified frequency.

Sine Definition

This frequency with the phase value defines the sine signal.

Frequency

This the frequency value of the source.

Phase

This the phase value of the source.

Start/Stop times

See corresponding parameters for the ‘Random’ sources.

Burst Sine Definition

The source is a simple sine signal but which drops to a zero level after a certain time.

Burst Sine Checkbox

Check the box ”on" to enable a burst random source signal.

Burst time

This value is the time (as a percentage of the acquisition time) for which the signal is to be applied.

Burst ramp time

This value determines the rate at which the desired signal level is attained and fades back to zero again. This value will automatically be limited to less than half of the burst time.

Periodic Chip

The source is a very rapid sine sweep over a frequency range.

Chirp Definition

This frequency range is defined by the minimum and maximum frequency values.

Relative

Relative values means that the frequency range will be updated whenever the Acquisition Bandwidth is changed.

Absolute

Absolute values means that the frequency range will always remain fixed.

Sweep Definition

The sweep is defined by its direction, type and duration.

UP

The frequency sweep is upwards from the minimum to the maximum value.

DOWN

The frequency sweep is downwards from the maximum to the minimum value.

Sweep type

Two types are available for selection, either a Lin (linear) or a logarithmic (Log) sweep.

Sweep time

This value is the time (as a percentage of the acquisition time) for which the sweep is to be applied.

Sweep ramp time

This value determines the rate at which the desired signal level is attained and fades back to zero again.

Settling Time

Start sources

This value is the time delay between starting the source and beginning the measurement

It is effective in the "Online Processing" and "Measure" worksheets. The settling time allows the structure to settle and to eliminate transient effects before doing the actual measurement.