User manual

d) Data logger, recording of measuring values

The recording of the measuring values is started with the REC button. Every 5s (adju-

stable, recording interval), for example, the measuring values are recorded (T1, T2,

T3 and T4) with time registration. The values are filed at a memory location. You can

see the values in the data logger window of the computer.

Proceed as follows to set the recording interval:

Actuate the button "T1 - T2" at the same time when you turn-on the thermometer

and you will get to the setup "Set". Now actuate the button "MAX MIN" once. After

that, there will appear "Int" for Interval and a flashing minute display. Now set the

desired recording interval in minutes and seconds. The maximum recording interval

is 59 minutes and 59 seconds. The minimum value is limited to "00: 01" (= 1s).

Actuate the "MAX MIN" button once again after completed setting and you will get

back to the current temperature measuring display.

Note!

Each press of a button is confirmed with a short "Beep" of the installed beeper.

C3 Jack assignment

The jacks T1 to T4 are so-called unipolar blade contact jacks. You must connect the

K type temperature sensors to these jacks if you want to carry out temperature mea-

surements according to the sensor specifications. Take into account that the blade

contact jacks have different widths.

Never try to squeeze the connectors the wrong way (+ and –

mixed up) with force into the jacks. The jacks would be destroyed

definitely and should be replaced.

The jack "OUTPUT" is the serial RS-232 interface in 3,5 mm stereo jack format. The

assignment can be defined as follows (connector plan):

At the back of the connector there is the ground = GND = reference mass (= refe-

rence potential)

In the centre of the connector there is the contact RX = 5 V high input (= data input)

At the front at the point there is the contact TX = 5 V high output (= data output)

And finally there is the jack DC 9V. You can connect here a power supply unit with

following output data: 9 V direct voltage, if possible, stabilised, with an output cur-

rent of at least 100 mA, a connector outside diameter of 3,5 mm and a connector

inside diameter of 1,35 mm. The polarity: minus "-" inside, plus "+" outside.

D Working position

Always operate the digital thermometer 309 so that you can read the liquid-crystal

display (LCD) or that the digital display points upwards.