Extech Instruments TM500 User Manual page 7

Measurements and related features
Basic Thermocouple Mode
Thermocouples are connected at the top of the meter to the jacks labeled T1 through T12.
Select the thermocouple type (J, K, etc.) to match the thermocouple type used. In normal
thermocouple mode the meter will simultaneously display the temperature for thermocouples
T1 through T12. Dashes are displayed if a thermocouple is not connected or if the measurement
is out of range.
Data Hold
To freeze a measurement on the display, press the HOLD button momentarily. The meter will
emit a beep, the reading will hold, and the HOLD icon will switch on. Press the HOLD button
again to release the display and exit the Data Hold mode returning the meter to the normal
operating mode.
Temperature Display OFFSET
The VPC300 allows the user to set a display offset that applies to all of the thermocouple
displays equally. To set the display offset follow the steps below:
1. Press and hold the OFFSET button for 3 seconds to reach the offset screen. The
temperature on the left is the currently displayed temperature for Channel 1 and the
temperature on the right is the offset temperature
2. Use the up and down arrow keys to adjust the display on the right to offset the display as
desired.
3. When finished, press the ENTER button to store the offset and return to normal operation.
4. All of the thermocouple readings will now reflect the offset value programmed by the
user.
To clear the OFFSET, follow the steps below:
1. Switch the meter power OFF
2. Press and hold the HOLD and REC buttons while switching the meter power ON
3. Release the two buttons when the meter switches ON
4. Press and hold the OFFSET button for 5 seconds and the display will show CODE 100
5. Use the up arrow button to change from CODE 100 to CODE 125 and then press ENTER
6. Use the arrow buttons to select YES or NO and then press ENTER
7. If YES is selected, the meter will clear the previously programmed offset. If NO is selected,
the meter will retain the offset programmed by the user.
MAX‐MIN Readings
For a given measurement session, this meter can record the highest (MAX) and the lowest (MIN)
readings for later recall.
1. Press the REC button momentarily to access this mode of operation (REC icon appears)
2. The meter is now recording the MAX and MIN readings.
3. Press the REC button again to view the current MAX readings (MAX icon appears). The
readings on the display are now the highest readings encountered since the REC icon was
netzerotools.com
7
netzerotools.com
TM500-EU-EN v1.1 12/13