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Hct iom~
EEEF
ENDL INE
Limit tupe:
Low High™
CE
sbi
L 1 mM 1 1.
Fo 1 Mm T
Ua
=4.%2
[ENDLINE
Hct ion
BEEF
[V], 4! M],
Hot ion
CLOSE ACTSBEIT
ENDLINE
Limit point?
20.3
[ENDLINE
System Monitoring
The limit action menu appears. Just press
to
select EEEF as the action. The HP-71 will beep if the
temperature either rises above 26 °C or falls below 24°C.
Note that if the beep is not a satisfactory alarm, you could
use an actuator channel to trigger an external alarm bell
or other signal.
Now you can set the control (actuator) limits.
To set a lower limit, press [L].
Set the lower limit to 24. 5°C. The program will compare
each reading with this limit.
The limit action menu appears. Use the
key to select
CLLOSE ACT-BIT asthe action.
Select channel 0 as the actuator channel. Whenever the
temperature of the bath drops below 24.5°C, the HP-71
will close actuator channel O on the HP 3421A, which
actuates the heater relay.
Now you can set the upper control limit.
To set an upper limit, press [H].
Set the upper limit to 25. 5°C.
7-29
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