Ahlborn ALMEMO 2390-5 Instructions d'exploitation télécharger pdf (Page 14)

3.3 Switching ON / OFF, retaining stored data, reinitialization

The ON / OFF slide switch (1) located on the left side of the device has two

switch positions :

To switch ON, push the slide switch (1) located on the left side of the device

upwards. - up : ON

To switch OFF, push the slide switch down - down : OFF

Retaining stored data

When the device is switched off, all sensor parameters and most device para-

meters remain stored in EEPROMs. The real-time clock continues to run and

the device status is retained so long as the 9-volt battery remains charged with

at least 6 volts. It is important when exchanging batteries to first connect the

new battery to the 2nd battery clip and only then withdraw the old battery. If the

old battery was already totally discharged, you will have to perform a reinitializa-

tion.

Reinitialization

The device should be reinitialized in the following circumstances : if the battery

supply is interrupted, if interference (e.g. electrostatic or incorrectly connected

peripherals) causes the device to behave abnormally, or if you need to cancel

incorrect programming.

You can activate this reset by pressing key CLEAR when switching ON. This

has the effect of clearing or resetting to their default values all measured data,

date, time-of-day, and also all internal setting data, e.g. cycles, conversion rate,

atmospheric pressure, and function key assignment. However, this does not

affect the programming of the sensors in the ALMEMO

connectors.

The reset function is not the only one that can be activated when switching ON;

other useful special functions can be activated at this stage by pressing the ap-

propriate keys :

Switching ON with various keys pressed:

CLEAR: This activates a reset

PROG und FUNCTION: This sets the locking mode for the selected measuring

point to level 3; this applies only temporarily until you

switch OFF again; (see Sections 6.2.1/2).

MANU: This changes the meas. point numbering mode;(Sec. 4.2)

START/STOP: This displays the device version

3.4 Sensor supply

The battery voltage or external voltage needed to supply the sensors is provi-

ded at the + and - terminals in the ALMEMO

connector. There are also spe-

cial connectors available for 12-volt, 15-volt, or 24-volt DC and for 5-volt and

2.5-volt reference voltages; (see Manual, sections 4.2.5/6). It is important to

ensure that the total current consumed by the sensors does not exceed 70 mA!

14 ALMEMO

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2390-5

Power supply

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Ahlborn ALMEMO 2390-5 Instructions d'exploitation Page 14

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