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The resolution of the output signal can also be calculated based on the resolution of the DAC
(digital to analog converter). As the DAC has a resolution of 16 bits, it is 1 part in 65536 (2^16),
allowing a very accurate current to be produced based on the measured Input.
Input Range / 65536 = Resolution
In this example: 100 / 65536 = 0.001526 degrees.
Auto-Update:
The auto-update mode updates the current in the 4-20mA loop every 1.0 second.
If Auto-Update is turned Off, the current will only be updated when the 4-20mA Output is run
(each scan). Generally, this will only be an issue when external power is not maintained on the
current loop. Auto-Update is enabled by default.
4-20mA Output:
Defines what the output current should be if it were measured with a current
meter. This is based on the value of the data source, the Max value and the Min value.
If a current meter is used to verify the output and it does not match this value, check the wiring
and voltage levels to verify they are ok. If the current meter reads zero milliamps, the wires
could be connected backwards or there is no power source for the loop. Remember that this
output controls the current in the loop but does not provide the power for the loop. An external
power source is required.
If the current displayed on a meter is in the range of 4 to 20 milliamps but is less than what is
displayed by this option, it may be the external power source is not big enough. In most cases a
12 volt battery will not be sufficient to power the loop; a 24 volt battery is required. This reading
and the actual current value may track at lower values but as the current approaches the 20.0
milliamp level the actual current as displayed on an external meter will start to drop off,
indicating the battery voltage is too low.
Force Current(5 min):
This option allows for a specified current (4, 12, or 20mA) to be
constantly applied to the loop for up to 5 minutes. The Test can be stopped at any time after it
has been started. This test can be useful to verify everything is functioning as expected on the 4-
20mA current loop.
System 5000
Outputs 6-37
TM
Содержание WaterLog Series
Страница 1: ...Model System 5000TM Owner s Manual Revision 1 4 2...
Страница 2: ......
Страница 8: ......
Страница 24: ...2 10 Hardware Overview System 5000TM...
Страница 58: ...5 14 Inputs System 5000TM...
Страница 128: ...10 14 System Setup General Setup System 5000TM...
Страница 144: ...12 6 System Setup Inputs Outputs System 5000TM...
Страница 168: ...14 4 Maintenance and Troubleshooting System 5000TM...
Страница 170: ...A 2 System 5000 Specifications System 5000TM...
Страница 172: ...B 2 Pressure Sensor Option Module Specifications System 5000TM...
Страница 174: ...C 2 Analog Digital Option Module Specifications System 5000TM...