Velleman DVM1322 User Manual download pdf (Page 4)

DVM1322_v2 VELLEMAN

e) "MAX"-mode

Select the desired input (T1, T2 or T1-T2) and press the MAX-key. The thermometer will now record and update the

maximum value for the selected input. The "MAX"-symbol appears on the display. Press MAX again to exit the

"MAX"-mode.

Press HOLD while the device is in the "MAX"-mode to stop the readings and press HOLD again to resume them.

4. Offset Adjustment

The OFFSET controls are set by the manufacturer and allow for the variations found in standard thermocouples. Use

the OFFSET controls to obtain maximum accuracy for a particular thermocouple (or a pair of thermocouples) when

used to measure a known temperature.

Adjustment for T1- or T2-Measurements

(a) Connect the thermocouple to the T1-input connector and activate the thermometer by pushing ON/OFF. Press

ON/OFF and T2 if you wish to use the T2-input connector.

(b) Place the thermocouple in an environment with a known and stable temperature that is close to the temperature

you wish to measure and allow the readings to stabilise.

the known temperature of the selected environment. Wait long enough in between adjustments as the device

needs some time to perfect its readings.

(d) Calibration of the device is now optimised for temperatures that approximate the temperature measured in (b).

Adjustment for T1-T2 Measurements

(a) Connect the thermocouples to the input connectors.

(b) Activate the thermometer and press T1-T2.

temperature you wish to measure and allow the readings to stabilise.

(d) Slowly adjust the OFFSET control for one of the thermocouples (but NOT for both) until the display reads "000".

Wait long enough in between adjustments as the device needs some time to perfect its readings.

(e) Calibration of the device is now optimised for the measurement of differential temperatures that approximate the

temperature measured in (c).

Reinstalling the OFFSET controls

Use the following procedure to reinstall the factory settings without having to recalibrate the device :

♦ Connect a thermocouple to the input to be adjusted.

♦ Place the thermocouple in an ice-water bath and allow the readings to stabilise.

♦ Slowly adjust the corresponding OFFSET control until the thermometer reads 0°C or 32°F.

5. Maintenance

WARNING : DISCONNECT ALL THERMOCOUPLES BEFORE REMOVING THE COVER IN ORDER TO AVOID

ELECTROSHOCKS.

Battery Replacement

Always use a 9V-battery (6LR61, IEC6F22). The

-symbol is displayed when the battery needs to be replaced.

Remove the three screws at the back of the device, remove the cover and replace the battery.

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Velleman DVM1322 User Manual Page 4