Hydrotechnik MultiHandy 3020, Руководство по эксплуатации

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The line „Available“ shows which recording time can be executed with the available memo-
ry. This value will always be updated with the number of selected channels, the scan rate
and the recording time.
How to fi ght the Data Flood
The size of the MultiHandy 3020 memory may seduce the operator to record series of
measurements with low scan rate and long recording time. This results in huge amounts of
data that needlessly complicate the later evaluation at a PC.
For instance if you record four channels with a scan rate of 1 ms for three minutes, you
will get 4 x 1000 x 180 = 720,000 measured values. If you increase the scan rate to 5 ms
and reduce the recording time to one minute, you will get 4 x 200 x 60 = 48,000 measured
values, only.
A good way to limit the data fl ood is the use of triggers. They allow to start the recording at
the moment, when a certain condition is fulfi lled. Triggers will be explained in the following
section.
8.1.4 How to use Triggers
Press [Menu].
[
▼
] [
▲
] Highlight „Recording“ [Enter].
[
▼
] [
▲
] Highlight „Defi ne parameters“ [Enter].
[
▼
] [
▲
] Highlight „Trigger“ [Enter].
****** Trigger ******
Trigger : none
[
▼
] [
▲
] Highlight „Trigger“ [Enter].
[
▼
] [
▲
] Select the desired trigger: „none“ (trigger switched off), „Key“ (re-
cording is started by pressing a key), „p1/p2/...“ (channel is supervised for the
trigger incident).
Confi rm the selection with [Enter]. If you have selected a channel of „Key“,
further options will be displayed:
****** Trigger ****** ****** Trigger ******
Trigger : p1 Trigger : Key
Trig. type : lower Pretrigger : 20%
Trig. value: 200.0
Pretrigger : 20%
[
▼
] [
▲
] Highlight „Trig. type“ [Enter].
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MultiHandy 3020
Operating Instructions
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Operating Instructions MultiHandy 3020 • © Hydrotechnik GmbH • All rights reserved