7.3 Analog output
7.3.1 Introduction
Two ranges of analog output (0-10 V y 4-20 mA) can be incorporated to the CA2150-E means of an additional card, either the
NMV card for voltage output or the NMA card for current output, which is installed on the meter's main board via plug-in connector
M3, both cards, cannot be used simultaneously.
The outputs are opto-isolated with respect to the signal input and the power supply.
The optional board provides a two terminal connector [(+) and (-)] that drives out a signal variation from 0 to 10V or from 4mA to
20mA proportional to a user-defined display range.
This way, the meter is furnished with a signal that can be used to control variables and operates at each moment proportionally to
the magnitude of the effect under control.
These signals can also be used to transmit display information to a variety of terminal equipment such as graphic recorders,
controllers, remote displays or other devices that accept input data in analog form.
The instrument will detect the type of option that has been installed and will operate in accordance.
The display values producing the full scale output (OUT-HI and OUT-LO) are also introduced via front-panel buttons in the same
programming module. The analog output then follows the display variation between the HI and LO programmed points.
The output signal can be set up for reverse action by programming the low display for the high output (OUT-HI) and the high
display for the low output (OUT-LO).
7.3.2 Installation of Analog 4-20mA and Analog 0-10V option
Lift out the electronics assembly from the case and use a screwdriver to pull on the junctions between the case and the grey-
marked area to detach it from the case. The so performed orifice will allow the analog output board connector be brought out at
the rear of the instrument. Install the circuit board so that the lower pin fits into the corresponding main board insertion slot and
push down to plug the M3 option connector in the main board M3 location. If the instrument is to be installed in high vibrating
environments, it is recommended to solder the card to the main board making use of the copper tracks on both sides of the card
pin and around the main board hole on its solder side.
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