ASTRO-MED Dash 4u Quick Start Manual - Page 6

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NOTES:
At this point, you can run the chart with your signals. Press the [MODE] key and run the chart you set up. To stop the
paper, press the [RUN / HALT] key. You can also freeze the display and use two cursors (A, B) to make time and
amplitude measurements. You can print the screen or even save the screen image to your Zip disk.
The Dash 4u has a 4 Gigabyte hard drive for data capture. In order to capture data, a trigger must be produced. For each
record, pre- and post-trigger data can be captured. You must select the conditions under which you will capture data
(trigger set up) as well as how you will collect the data (number of samples per second and for how long). Further, within
the data capture record, you can pick where the trigger point will be placed.
SETUP DATA CAPTURE
[SET SAMPLE RATE]
[SET RECORD SIZE]
[SET TRIGGER Win.]
[SET OPERATION]
[AUTOTRIG]
[SET CHANNELS]
SETUP TRIGGER
[MANUAL]
For each of the five amplifier types, there are different attenuator ranges. If you
can't get the desired range and offset, you need to select a different attenuator.
If you will use user scaling to assign engineering units, it is recommended to first
set up your channel in terms of voltage and verify you signal. Then, assign your
units.
The upper and lower bounds of the channel can be printed in the latter part of the
text buffer for the channel: [SYS] [CUSTOMIZE CHART]
[CHANGE WAVEFORMS] [AMP. REPORT on]

7. DATA CAPTURE

[SYS] [SETUP DATA CAPTURE]
There are six parameters for setting up data capture:
Use the encoder wheel to select how many samples per second you will take.
Use the encoder wheel to select how much memory you will use. To help you
decide, the length of capture (time duration) is shown. Pick enough memory to
give you enough recording time.
Use the encoder wheel to select where within the capture the trigger will be. In
addition to Start, Center and End, the trigger can be any percentage value of the
record. By placing the trigger point at any value other than Start, you will record
pre-trigger data.
You can capture one record only (single capture) or capture one record only and
play it to the chart (single capture and playback). Select multi-capture with or
without playback to capture more than one record. With multi-capture, the Dash
4u re-arms itself, waiting for the next trigger.
When auto-trigger is ON, as soon as the Dash 4u is armed ([ARM] key), it will
start a data capture. When auto-trigger is OFF, the Dash 4u waits for a trigger.
Select the channels to be captured.
[SYS] [SETUP TRIGGER]
Once the data capture is set up, select the conditions under which you will take
data. In addition to auto-trigger listed above, there are four other ways to trigger
a capture:
When activated, the [TRIG] key on the Dash 4u will produce a trigger.