ASTRO-MED DASH II Manuel de démarrage rapide - Page 6

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a 10Hz signal. The upper line of the display shows the DSP status of the channel. In the above example,

channel 1 is in DC mode and has a 20Hz lowpass filter.

DSP ON/OFF

•

Press the softkey below "Off" to toggle DSP on/off.

FILTERING

•

Press the softkey below "Notch" to toggle on a notch filter. Use the encoder wheel to select either a

50Hz or a 60Hz filter.

•

Press the softkey below "LPass" to toggle on a lowpass filter. Use the encoder wheel to select any

frequency to filter, from 1Hz to 500Hz.

RMS

•

Press the softkey below "RMS" to change the signal to root mean square (RMS). Use the encoder

wheel to select a time base for the RMS processing, either slow, medium or fast.

6. ADVANCED OPERATION: SETTING UP DATA CAPTURE

Data capture allows you to record data to the internal RAM in the recorder. The DASH II has the ability to

capture up to 256 kilosamples of data per channel. Once in memory, you can playback to data at will,

expand the data for better resolution and download the data to a 3.5" floppy disk for permanent archiving.

Once on a floppy disk, the data can be easily transferred to a PC for analysis using third party

spreadsheet/analysis software. As you can see, data capture is a very powerful tool which can be used for

many applications.

In order to complete a data capture you must define several parameters, set the triggers and arm the system

to respond to the triggers. The parameters which must be defined include:

•

Sample Rate - The rate at which data is collected

•

Triggering - The method by which the data capture is initiated. Either timer, waveform or manually.

•

Trigger Position - the amount of data which is collected before the trigger. This allows you to see the

events leading up to the trigger.

•

Record Size - The amount of internal RAM which is allocated to a single data capture.

To illustrate the data capture process, we'll setup a sample data capture. First, let's go into the capture

configuration menu.

•

Press the [MENU] key twice.

•

From the second screen of the main menu, select the softkey below "Capt Cnfg." The capture

configuration menu will appear.

CAPTURE CONFIGURATION MENU

Capt

Ctrl

•

Press the softkey below "Capt Ctrl."

•

Press the softkey below "Mode" and use the encoder wheel to select the data capture mode. You can

select either manual or auto triggering and either safe or overwrite modes for file storage.

Since there is only a finite amount of RAM within the recorder, you must select how you want the memory

used. In safe mode, the recorder will save data only until the memory is used up. Earlier files will not be

overwritten by later files and all of the data within the recorder will be safe. In overwrite mode, when the

memory is used up the recorder will overwrite the oldest files. This allows the recorder to continue

Trig

Capt

Pos

Optn

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