Extech Instruments TM500 User Manual page 10

Automatic Datalogging
In automatic datalogging mode the meter takes and stores a reading at a user‐specified sampling
rate onto an SD memory card. The meter defaults to a sampling rate of two seconds. To change
the sampling rate, refer to the Setup Mode section (the sampling rate cannot be '0' for
automatic datalogging):
1. Press REC button to turn on record mode. The REC icon will appear in the upper left corner
of the display.
2. Start an automatic Datalogging session by pressing the LOGGER button.
3. The meter will scan for an SD card and verify that it can be used to store data. If a card is
not inserted or if the card is defective, the meter will display SCAN SD indefinitely. In this
case, switch the meter OFF and try again with a valid SD card.
4. If the SD card is valid, the display will show the DATALOGGER icon and then the
DATALOGGER and the REC icons will flash each time that a reading is stored.
5. To pause the datalogger press the LOGGER button momentarily. The DATALOGGER and REC
icons will stop flashing. To resume logging simply press the LOGGER button again
momentarily.
6. To terminate the datalogging session press the LOGGER button to stop the logging and then
press the REC button for at least 1.5 seconds.
7. When an SD card is used for the first time a folder is created on the card and named
TMD01. Up to 99 spreadsheet documents (each with 30,000 readings) can be stored in this
folder.
8. When datalogging begins a new spreadsheet document named TMD01001.xls is created on
the SD card in the TMD01 folder. The data recorded will be placed in the TMD01001.xls
document until 30,000 readings are reached.
9. If the measurement session exceeds 30,000 readings, a new document will be created
(TMD01002.xls) where another 30,000 readings can be stored. This method continues for
up to 99 documents, after which another folder is created (TMD02) where another 99
spreadsheet documents can be stored. This process continues in this same fashion with
folders TMD03 through TMD10 (last allowable folder).
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