Sper Scientific 800023 Thermometer 4 Channel - Manual (Page 9)

THERMOMETER
8
TX
RX
GND
“ °C/°F ” ,“△REL” button in "MAX MIN" mode, there
will be two continuous beep)
To exit the MAX/MIN mode, one may press and hold
"MAX MIN" for two seconds.
4.8 Auto Power Off:
By default, when the meter is powered on, it is under auto
power off mode. The meter will power itself off after 30
minutes if no key operation and no RS232
communication combination at power on can disable auto
power off.
One may press and hold “HOLD” button and then power
on the meter and there will be two successive beeps to
indicate that auto power off is disabled and the will
not show up.
4.9 Low Battery Condition
When the battery voltage is under proper operation
requirement, the symbol will show on the LCD and
the battery need to be replaced with new one.
4.10 Calibration Point:
input Adjust VR tolerance
0 °C VR1 ± 0.1 °C
190 °C VR2 ± 0.1 °C
1000 °C VR3 ± 1 °C
1900 °F VR4 ± 1 °F
4.11 Digital Output:
The Digital Output is a 9600bps N 81 serial interface.
The RX is a 5V normal high input port.
The TX is a 5V normal high output port.
P.S Normally, performing
offset Calibration with
thermal stabled ice
water through VR1 will
give a very good
calibration result.