64
Getting Started with DT800
dataTaker
UM-0071-A0
i) Watch the text window and turn the potentiometer
knob to its fully clockwise position.
You’ll see
• alarm records returned to the text window’s
display screen when the potentiometer’s value
exceeds 300 ohms (in addition to the regular
data records); they contain your alarm
message, are marked with a red pointer on the
left-hand side of the display screen, and are
prefixed with
A
for alarm (data records are
prefixed with
D
• the Event Logs window open automatically;
each new alarm event appears at the top of the
Alarms tab.
j) Experiment with the potentiometer knob to see the
alarm records returned to the text window and the
Event Logs window.
Alarm messages are also returned to the form
window’s Alarm Message column.
k) When you’re done, close the Event Logs dialog box
if it’s in your way.
9-10
A
DD
S
CHEDULE
B
TO
THE
P
ROGRAM
Next, you add a second schedule that instructs the
DT800 to scan the potentiometer channel at a faster
rate (in addition to the 5-second rate).
➲
Set schedule B’s rate to 2 seconds, and use
the copy and paste method to add the
potentiometer channel to schedule B.
To do this…
a) At the bottom of the program builder window, click
the tab labelled
B
.
You could have used any of tabs B to K.
b) Set a
time interval
trigger for schedule B of 2
seconds by following a similar procedure to that
shown in Figure 29 on page 34.
c) Use the right-button copy and paste method (see
Figure 57 on page 57) to copy row 1 on tab
A
and
paste it into row 1 on tab
B
.
The program now instructs the DT800 to scan its
channel 1, the potentiometer channel, every 5
seconds (by schedule A) and every 2 seconds (by
schedule B).
d) On tab B, type
Potentiometer2s
in the
Label
column
of R1.
e) On tab B, click the Configure button
in the
Alarm
column of R1. In the Alarm dialog box that
opens:
i. Change the Alarm Number to
2
.
ii. Change the value in the set-point field to
425
.
iii. Change the alert message to read
ALERT:
channel 1 greater than 425 ohms
.
iv. Click
OK
to close the dialog box.
F
IGURE
66
Alarm and data records returned to DeLogger’s text window — schedule A
Summary of Contents for DT800
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