ε
Emissivity entering mode
MAX
Secondary readout displays the maximum temperature sensed during a single
measurement session (In Scan mode, a measurement session begins when the trigger is
squeezed and ends when the APO function powers off the instrument.)
MIN
Secondary readout displays the minimum temperature during the current measurement
session
dIF
Secondary readout displays the largest temperature difference during the current session
AVG
Secondary readout displays the average temperature sensed during the current session
HAL
Secondary readout displays the high alarm setpoint. To change the setpoint, use the
°C/°F
and
Lock
buttons to enter a new temperature threshold and then squeeze the
trigger to save the setting.
LAL
Secondary readout displays the low alarm setpoint. To change the setpoint, use the
°C/°F
and
Lock
buttons to enter a new temperature threshold and then squeeze the
trigger to save the setting.
PRB
Secondary readout displays the temperature sensed by an optional “K” type
thermocouple plugged into the socket on the right side of the grip (Fig. 1, Callout 11).
To
make a contact measurement using a thermocouple
, place its bead or stem on or in
the target. To view the minimum and maximum temperature sensed during a
measurement session with an external probe, press and hold the
°C/°F
and
Lock
buttons, respectively.
M00
Memory mode.
To save a measurement
, press the
Mode
button after making the
measurement.
To recall a measurement or set of measurements
, use the
°C/°F
and
Lock
buttons to scroll through the data sets stored in memory.
Fig 4 shows a typical IRT850K memory screen. It shows that a
measurement of 1854°F on an object with an emissivity of 0.95 was
made and stored in memory location 02. In addition, the “LOW” icon on
the screen reveals that when the reading was stored it was below the
instrument’s low alarm setpoint (LAL). The IRT850K can store up to
24 pairs of temperature measurements/emissivity values.
Fig. 4. A typical IRT850K memory screen
Two other functions are available whenever the IRT850K is operating in MAX, MIN, dIF or AVG
mode.
1. Pressing the
Lock
button puts the instrument into LOCK mode. In this mode, the
thermometer makes and displays measurements continuously for up to one hour without
pulling the measurement trigger. In LOCK mode, the “wave” portion of the SCAN icon on
the top line of the LCD blinks continuously and the time over which MAX, MIN, dIF and AVG
readings are calculated is extended to 1 hour from the APO interval of 1 minute.
To unlock the trigger, press the
Lock
button again.
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