OPERATING INSTRUCTIONS
NORMAL OPERATION
1. To prepare to make measurements, power on the RDXL12SD and make sure an
SD card is firmly seated in the socket on the bottom of the instrument.
By default, the RDXL12SD uses Celsius units for temperature measurements. If you wish to
make Fahrenheit units the default, press the SET button to enter setup mode. Using the
HOLD/NEXT button, skip ahead to Step 8 of the Setup Instru
ctions and perform it.
2. To use “K” type ther
mocouples to measure up to 12 channels of temperature, plug one
to 12 of them (two are supplied, others are available for purchase from General) into
the jacks (callout 1-9 of Fig. 1) on the top of the temperature recorder. Make sure jack T1
is occupied. Because “K” is the instrument’s default thermocouple type, plugging in up to
eight “K” type thermocouple
s will instantly produce up to eight display readings. Any of
the eight channels th
at are not used will show the overrange reading “- - - - -”.
To show the other four of the 12 channels, press the PAGE
button once. To return the
display to Channels T1 through T8, press the PAGE
button again.
3. To use “J”, “T”, “E”, “R” or “S” type thermocouples to measure up to 12 channels of
temperature, first press the TYPE
button as many times as necessary until the letter
of the thermocouple type you are using appears on the top line of the display. Then plug
one to 12 of the optional accessories into the jacks on the top of the thermometer. As
with “K” type thermocouples, display readings are instantaneous. Use the PAGE
button to toggle between displaying Channels T1 through T8, or Channels 9 through 12,
as with “K” type thermocouples.
Whenever the thermometer is in measurement mode, you can turn off the backlight (which
is on by default) by briefly pressing (but not holding) the POWER/ESC button, which has a
backlight icon stenciled above it. To reactivate the backlight, briefly press the button again.
Whenever the instrument is in measurement mode, you also can check the current date
and time by briefly pressi
ng the SET button (which has the words “Time check” stenciled
below it). Doing so causes the three settings year, month + day, and hour + minutes to
appear briefly and in that order at the lower left of the display.
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