HP 82479A Owner's Manual page 89

System Monitoring
7.2 LIMIT TESTS
You can specify up to five limit tests for each trace. For each limit test a limit point and a limit action are
specified. The current value of the trace must go past the limit test for the limit action to occur. That is,
the limit point is not inclusive. For a lower limit, the limit action occurs when the current value for the
trace goes below the value of the limit point. For an upper limit, the limit action occurs when the current
value for the trace goes above the limit point. The available limit actions are:
e BEEP - Sound a beep on the HP-71
e HIGHLIGHT - Display the trace label in inverse video.
e PRINT - Print a message on the system printer.
e OPEN ACT/BIT - Open an actuator channel or clear a bit on a digital output card.
e CI OSE ACT/BIT - Close an actuator channel or set a bit on a digital output card.
e LIMIT PROGRAM - Call a user-written subprogram.
You can use a limit test to either warn an operator of a condition, or to directly control a system. For
example, in a temperature monitoring application, two limit tests could be used: the first opens an actuator
channel if the temperature goes above 200°C, while the second closes the actuator if the temperature goes
below 200°C. The actuator channel could be connected to a warning light to signal an operator, or it
could directly control a heater circuit through a relay.
7.3 MONITOR PROGRAM OPERATION
The MOM I TOF program is driven by a setup which consists of a list of the traces and the corresponding
specifications for each trace. The setup file specifies how many traces to read, the function for each
trace, the scale for the display, and what limit tests (if any) should be used. You may store the setup in a
file for repeated use.
7-3