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Teledyne API Model 465L O
3
Monitor Operation Manual
05509F DCN6409 29
4.2. Electrical I/O Connections
4.2.1. Location of I/O Connectors in the NEMA
Configuration
In the NEMA configuration of the M465L, the I/O connectors are located internally in the
instrument. See Figure 4-7 for their location. The relative position of the connectors and the
pinout information is the same as the Rack-Mount configuration shown in Figure 4-6.
Connection to these terminals is usually made via a conduit connection to the NEMA enclosure.
A standard conduit penetration may be added to one of the walls of the enclosure for this
purpose, or the existing penetration may be used.
4.2.2. Analog Output
The analog output is located at the “General I/O” connector (See Figure 4-6) and is labeled
“ANA.” The analog output can be configured for 0-5V voltage or 4-20 mA current output. See
Section 9.8 for details on verifying or changing the analog output hardware configuration.
The analog output is automatically scaled to the range of the instrument, i.e. if the monitor range
is 1000 PPB, then 5V would correspond to 1000 PPB and 0V would correspond to 0 PPB. See
Section 7.2.7 for information on changing the range of the monitor.
The M465L has an analog output step-test mode that can be used for verifying the operation of
the analog output and calibration of external measurement equipment. This mode is described in
Section 7.2.3.1.
4.2.3. Status Outputs
There are four instrument status outputs located at the “General I/O” connector. These status
outputs mirror the state of the four diagnostic LEDs on the front panel.
Electrically these outputs are SPST dry contact relay closures with a common contact, labeled
‘C’ on the rear panel. They are capable of switching up to 50 VDC, 250mA maximum current.
There are no polarity requirements, so the outputs can be used to sink or source current from the
‘C’ pin, within the maximum voltage and current specified. Schematically, the outputs look as
shown in Figure 4-8 below: