ASTRO-MED DASH II Посібник із швидкого старту - Сторінка 5
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Press the softkey below "SENS".
•
Turn the encoder wheel to adjust the sensitivity for the selected channel. Sensitivity is expressed as
either mV full scale or V full scale. Sensitivity can range from 50mV full scale to 350 V full scale.
ZERO SUPPRESSION When a waveform input signal contains an unwanted direct current (DC)
component, zero suppression can be used to remove up to 250V, depending on the channels range. See the
Operations Manual for more information.
•
Press the softkey below "ZS" to and use the encoder wheel to adjust the zero suppression for the
channel.
ZERO POSITION The DASH II has a zero position parameter which enables the zero baseline to be
placed anywhere on the grid.
•
Press the softkey below "Pos" and use the encoder wheel to adjust the zero position of the waveform
on the grid. The position is expressed in percentage of the grid with 0% being the center, +50% being
the left edge and -50% being the right edge.
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Press the [CH1] button a second time. The second screen of the channel 1 menu will appear.
SECOND SCREEN OF THE CHANNEL 1 MENU
1 - DC
Gnd
DC/GND
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Press the softkey below "Gnd" to toggle between DC and ground.
BRIDGE
Bridge inputs are used for transducers which require an input current from the recorder in order to produce
a measurable voltage. These types of transducers include strain gages, LVDTs, pressure transducers and
load cells.
•
If you will be using the bridge inputs, disconnect any voltage input cables from the recording channel
and connect the transducer to the D-Shell connection marked "Bridge" on the front panel of the Dash
II.
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Press the softkey below "Brdg" to switch channel 1 to a DC bridge input. Press the softkey again to
return to DC signal inputs.
CHANNEL ON/OFF
•
Press the softkey below "Off" to toggle channel 1 on/off.
CALIBRATION
Refer to the Operations manual for information on calibration.
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Press the [CH1] key a third time. The third screen of the channel 1 menu will appear.
THIRD SCREEN OF THE CHANNEL 1 MENU
1 - DC
DSP
Off
The Dash II is equipped with digital signal processing (DSP) including filters and RMS data conversion.
Filters are used to remove unwanted signal from the desired data, for example, 60Hz power line noise from
Signal Control
Brdg
Off
20 Hz
LP
Notch
LPass
Cal
RMS