User`s manual

74 cHAPTER 5: Advanced Operation
Model 335 Temperature Controller
Monitor Out settings depend on the Monitor Units selected, and are limited to the
acceptable values of the selected units.
Default:
PolarityQUnip
olar
Monitor Out 0 V and -10 VQ0.00
00 K
Monitor Out +10 VQ100
0 K
Interface Command: ANA
LOG
5.7 Alarms and
Relays
5.7.1 Alarms
Each input of the Model 335 has high and low alarm capability. Input reading data
from any source can be compared to the alarm setpoint values. A reading higher than
the high alarm setpoint triggers the high alarm for that input. A reading lower than
the low alarm setpoint triggers the low alarm for that input.
Menu Navigation:
AlarmQInp
ut (A, B)QAlarm (Off, On)
AlarmQInp
ut (A, B)QAlarm (On)QLow Setpoint (see note below)
AlarmQInp
ut (A, B)QAlarm (On)Q
ENTER
QHigh SetpointQ(see note below)
Low and High Setpoint limits are determined by the Preferred Units of the associated sen-
sor input.
Defaults:
AlarmQOf
f
Low SetpointQ0.0
000 K
High SetpointQ1
000 K
Interface Command: ALA
RM
5.7.1.1 Alarm Annunciators
The Alarm LED annunciator steadily displays wh
en any alarm that is enabled also has
the Visible parameter enabled. The annunciator flashes when an alarm with the Visi-
ble parameter enabled activates. An input need not be display
ed for the system Alarm
annunciator to indicate input alarm status, but if the input is displayed on the front
panel, then the reading will alternate between the alarm status message and the
actual reading. If the Audible parameter is set to On for an enabled alarm, then the
beeper inside the instrument will sound when the alarm activates. The two relays on
the Model 335 can also be tied to alarm functions as described in section 5.7.2. You
may want to set the Visible parameter to Off if there is
no need for showing the alarm
state on the front panel, for instance, if you are using the alarm function to trigger a
relay. The Audible parameter can be set to Off as well to keep the audible alarm from
sounding when an alarm is triggered.
Menu Navigation:
AlarmQInp
ut (A, B)QAlarm (On)Q
ENTER
QVisible (Off, On)
AlarmQInp
ut (A, B)QAlarm (On)Q
ENTER
QAudible (Off, On)
Default:
VisibleQOn
AudibleQOn
Interface Command: ALA
RM