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1551A/1552A Ex
Users Manual
8
Primary Display
Push Ato toggle the numeric display between the current reading, minimum,
maximum, and 1-minute trend values in °C or °F as calculated since power up or since
the last reset of values. Push and hold the A button for 2 seconds until "CLR" shows
to reset the MIN/MAX/TREND values.
Stability Display
The Stability Display shows the general stability level relative to a user-configurable
stability limit. There are four presets for stability shown in °C or °F (0.01, 0.1, 1.0, or
10.0). When the limit is exceeded, it also shows the general direction in which the
readings are presently moving. The stability level is calculated from a moving sample
window of 6 seconds, with the value extrapolated to a 1-minute time base.
Segments are turned on to indicate the stability level as follows:
• Center only (stable) - when half of the 1-minute trend value is less than or equal to
the stability limit, i.e. maximum deviation -limit to +limit.
• Center plus one arrow up or down (depending on the trend) - when half of the 1-
minute trend value is greater than the stability limit and is less than or equal to twice
the stability limit.
• Center plus two arrows up or down (depending on the trend) - when half of the 1-
minute trend value is greater than twice the stability limit and is less than or equal to
three times the stability limit.
• Center plus three arrows up or down (depending on the trend) - when half of the 1-
minute trend value is greater than three times the stability limit.
Setup and Configuration
Push B to enter the setup modes. Inside the setup modes the buttons work as follows:
A Exit to the main display.
B Step to the next menu item, exit to the main display after the last item.
C Enter the data-edit mode for the present menu item.
During the data-edit mode, use K and L to scroll through the values. Push C to save
and exit back to the menu item.
The following sections describe the setup items in the order in which they appear.
Temperature Unit Selection
The Temperature Unit Selection Menu lets you choose the unit used when showing the
primary variable.
K Change the unit °C or °F.
L Change the unit °C or °F.
C Exit back to menu item
Stability Limit
The stability limit setting is used to find when the secondary display will show that the
reading is stable. There are four preset settings for stability (0.01, 0.1, 1.0, or 10.0)
expressed in the presently selected units.
K Change the unit-stability limit setting to the next greater setting.
L Change the unit-stability limit setting to the next lesser setting.
C
Exit back to menu item