General Tools and Instruments DT4208SD - Manual (Page 8)

9. Set the data logging sampling time. Once the default temperature unit has been
selected and stored, the display will show the term “SP-t” in the third row of the right
column. Press the REC/ENTER button and then press the TYPE ▲ or PAGE ▼ button to
decrease or increase the value until the desired sampling time appears above “SP-t”.
The options are 0, 1, 2, 5, 10, 30, 60, 120, 300, 600, 1800 and 3600 seconds (0 seconds
to 1 hour). Then press the REC/ENTER button to store the selection as the default.
10. Format the SD card. Once the sampling time has been set and stored, the term
“Sd-F” will appear in the bottom row of the right column. Press the REC/ENTER button.
Pressing the REC/ENTER button will cause the word “no” to appear over the term “Sd-F”.
Press the TYPE ▲ or PAGE ▼ button to toggle between "no" and "yES". Choose “yES”
whenever a new SD card is being used, or when a used card is being repurposed (from use
with another SD card instrument or a camera, for example) and all data on it is to be
erased. Choose “no” to preserve any data on a card previously used with this instrument.
Press the REC/ENTER button to make a selection.
If you choose “yES”, after you press the REC/ENTER button the instrument will prompt you
to confirm that decision by displaying the term “Ent” below “yES” and sounding three
beeps (if the beeper is enabled). To confirm that you want to begin the erasure/formatting
procedure, press the REC/ENTER button. “Ent” will then flash several times and the
instrument will sound another three beeps to confirm that the SD card has been erased and
formatted.
Once the SD card has been formatted (or not), the display will return to flashing the first of
the eight steps in the setup sequence—setting the current date and time. To re-enter the
setup sequence in order to change one or more settings, press the REC/ENTER button. If
you are satisfied with the existing settings, press the POWER/ESC button to exit setup
mode and enter normal operating mode.
ADJUSTING THERMOCOUPLE OFFSETS
To maximize the accuracy of measurements, General strongly recommends that you
compensate for (offset) the small measurement error peculiar to each thermocouple used
with the instrument.
To adjust the offset of a thermocouple, press the TYPE ▲ button until its type appears
on the top line of the display. Then plug the thermocouple into the T1 jack on the top of the
thermometer.
Press the LOGGER button (which has the term “Offset” stenciled above
it), hold it for at least three seconds, and then release the button. The
screen shown at right will appear:
Next, use the TYPE ▲ or PAGE ▼ button to adjust the value under “oFS” to match the
value under “SEt”. Then press the REC/ENTER button to store the offset adjustment and
return the instrument to measurement mode. Repeat the procedure for each thermocouple
to be used.
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