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9410 series - User manual
Analog inputs
Analog input applications
You can use an analog input to monitor an analog signal, for example a flowmeter, to monitor how
much water flows through a pipe.
For analog input operation, your meter takes an analog input signal and provides the resulting
scaled value.
Your meter's analog I/O option modules can measure either low voltage or current using standard
analog transducers such as 4–20 mA current transducers.
Analog input voltage and current mode
You can set the analog input's mode for voltage or current sensing.
In current mode, the analog inputs have a low input resistance while the meter is powered on, and
a high input resistance when the meter is powered off. In voltage mode, the analog inputs have a
high input resistance regardless of whether the meter is powered or not.
NOTE: When unpowered, your meter's analog inputs act like they are in voltage mode (high
input resistance).
When connected to a current output transducer, this high resistance can create a high voltage.
Standard (i.e., 4–20 mA) current transducers have open circuit protection and can handle a high
input resistance; however, if non-standard transducers are used high voltages may be generated.
Your meter's analog input has circuitry to limit this voltage, but it may not be sufficient with a very
high-power current source.
EQUIPMENT DAMAGE
Failure to follow these instructions will result in equipment damage.
• Ensure the analog input is configured for the correct voltage or current mode before
connecting or activating the current transducer.
• Do not exceed the device's ratings for maximum limits.
Analog input behavior
Analog inputs may show a value below zero scale if an open circuit is detected on the input port.
Analog input zero scale and full scale values
In most cases the output range of the sensor feeding the analog input matches the hardware
limits of your meter's analog input port. In that case, the analog input's zero scale and full scale
values are the same as the sensor's represented range. For example:
7EN05-0336-09
NOTICE
Inputs/Outputs
125
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Troubleshooting
