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5.4.8.
Test parameters
Note: The outputs become active immediately after pressing the
button
. Testing ends when exiting from the test parameters.
P80: - - - -
Current output test [mA]
Opening this parameter will display the actual current output. Set any value between 3.8 < x < 20.5 mA. Check current output with an ammeter. It
has to show the same value set previously. Return to the parameter address by pressing
.
P81: - - - a Relay test
The current state of the relay can be seen on the display (code according to the table below and symbol on the screen). Test the relay by
pressing
and white observing change of the symbol and the code or listening to the ticking of the relay or checking on-off resistance with
a multimeter.
a
R
ELAY STATE
0
De-energized
1
Energized
P82: - - b a Gain and short/long characteristic test
During the measurement, the level transmitter automatically changes the general gain (0, 1, 2, 3 gain stages) and the distance depending on gain
characteristics (short, long version) according to the measurement environment. In the case of the short characteristics, the distance depending,
gain reaches the full-scale value at the half of the maximum measuring distance (X
M
/2), which gain is only available on the maximal measuring
distance in case of long characteristics. When the maximum distance to be measured (H) of the application is smaller than half of the maximum
measuring distance (H
≤
X
M
/2), then the 0/ long option is chosen for strong reflection. For reducing echo strength, the settings are selected in the
following order: 0/ short, 1/ short, 2/ short, 3/ short. If H > X
M
/2, always the long gain characteristic is selected. Opening this parameter shows the
selected value for
a
(0, 1) and
b
(0, 1, 2, 3). Changing
a
and
b
parameters on a test basis can test the operation with an oscilloscope (connected
to the
DEM
signal test connection).
b
G
AIN CHARACTERISTICS
DEPENDING ON THE DISTANCE
a
G
ENERAL GAIN
0
Short
0
Smallest gain
1
Long
1, 2, 3
Increasing gain stages
Содержание EchoTREK S-300
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