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Peak-Hold Function
The OS4000 can be selected for Peak-Hold analog output via. the PC interface
software. The holding time can be selected from 1 to 60 seconds. Figure 18 shows
a typical Peak-Hold analog output time diagram with a Holding Time of 2
seconds.
Figure 18. Peak & Hold Timing Diagram
Signal Averaging (Sample & Hold) Function
The OS4000 provides analog output averaging. This function is desirable when
the process temperature is changing too rapidly and the user is more interested
in the overall trend of the process temperature. Fig 19 shows a fast process
temperature and the corresponding analog output when the response time is set
to 1.6 seconds. The analog output provides an update every 1.6 seconds where
the output is the average of all the sample temperatures within the 1.6 seconds
time period.
Figure 19. Signal Averaging (Sample & Hold) Timing Diagram
PROCESS
TEMPERATURE
TIME
1.6 SEC.
SAMPLE TIME = 1.6 SECONDS
PROCESS
TEMPERATURE
HOLDING TIME = 2 SECONDS
TIME
2 SEC.
1 SEC.
2 SEC.
2 SEC.
PC Interface
4-4
4