General Tools and Instruments PM930SD - Manual (Page 8)

HOLDING AND STORING MEASUREMENTS
1. To hold a measured value of pressure, press the HOLD/ESC button during the
measurement. Doing so will cause the word “HOLD” to appear at the top of the display.
Pressing the HOLD/ESC button again releases the hold.
2. To record and recall readings, press the REC/ENTER button while making
measurements. This will make the term “REC” appear at the top of the display. Pressing
the REC/ENTER button again, briefly, will make the term “MAX” appear to the right of
“REC” and switch the display to the maximum value stored in memory during the last
recording session. Pressing the REC/ENTER button again, briefly, will make the term
“MIN” appear to the right of “REC” and switch the display to the minimum value stored
during the last session.
3. To exit recording mode, press and hold the REC/ENTER button for at least three
seconds, until the term “REC” disappears from the top line of the display. The display will
then revert to showing the current reading.
AUTOMATIC VS. MANUAL DATALOGGING
The PM930SD can automatically log data at a user-selected sampling period from 1 second
to 9 hours. To view the sampling time for which the instrument was set up, press the
LOGGER SET button (which has the words “Sampling check” stenciled below it) once.
To change the sampling time, perform Step 3 of the setup procedure.
1. To start automatic datalogging, press the REC/ENTER button once. The top line of the
display will then show the term “REC”. Pressing the LOGGER SET button at this point will
make REC flash and add the flashing term “LOGGER” at the top right of the display. This
indicates that the instrument is currently storing measured values and their time stamps
in memory.
2. To pause automatic datalogging, press the LOGGER SET button once; this action
makes the flashing term LOGGER disappear from the top right of the display and changes
the term “REC” from flashing to constant. Pressing the LOGGER SET button again
resumes automatic datalogging.
3. To end automatic datalogging, press the REC/ENTER button and hold it for at least two
seconds. This action causes the “REC” message to disappear.
4. To log data manually, set the sampling time to zero using the procedure detailed earlier.
Then press the REC/ENTER button once. The display will show the term “REC” on the
top line, a value in the middle, and below it the letter “P” on the left and a number from
1 to 99 on the same line to the right. The number indicates the position on the SD card
that will be used to store manually logged data.
Now press the LOGGER SET button. This will cause the beeper to sound and the term
“LOGGER” to briefly appear at the upper right of the display. As in automatic datalogging
mode, in this mode the instrument is storing measurements and their time stamps on the
SD card.
In manual datalogging mode, however, measurements are being stored continuously
(with a sampling time of zero), and their locations on the card can be changed.
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