ASTRO-MED DASH II Manual de início rápido - Página 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

•

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.

•

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.

•

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

Notch

LPass

Cal

RMS