Delta OHM HD3406.2, Руководство пользователя, Страница: 7 / 44

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the value of the first sample to be set: each time the PRINT key is pressed, the identification
ID in the printing is increased by 1 allowing progressive measurement of all measured sam-
ples. If the Auto-Hold function, described below in this chapter, is enabled, the print time in-
terval is forced to zero. Pressing SERIAL only causes the print to occur when the measure-
ment has stabilized (HOLD symbol still). Later, it is possible to repeat the print at will, but
while the HOLD mode is on, the sample identifier number is not increased. This is useful
when more labels must be printed with the same identification code without increasing the
code each time.
The message "SMPL ID UNT=RSET SER=PRNT" is scrolled in the comment line: using
the arrows (
and ) the currently measured sample identifier value can be changed.
By holding the °C/°F (Unit) key down the proposed number is rapidly set to zero.
The instrument's heading information will be printed using the SERIAL key.
5) AUTO-HOLD function : the instrument normally operates in continuous view mode (de-
fault setting). In this mode the displayed measurement is updated every second. If the Auto-
Hold function is enabled, the instrument performs the measurement and when it stabilizes it
goes in HOLD mode. To update the display indication, press FUNC .
In the following figure you can see an example of the measurement process with the Auto-
Hold function enabled. In the following figure you can see an example of the measurement
process with the Auto-Hold function enabled. A probe is immersed into a liquid at conduc-
tivity
χ
1
and, to perform the measurement, the FUNC key is pressed: The conductivity
measurement raises progressively reaching the final value. The HOLD symbol blinks. In the
stretch indicated by 1, the measurement remains stable for 10 seconds, within two digits: at
the end of this interval (point 2), the instrument goes into HOLD mode, presenting the final
stable value.
2 digit
10s
t
χ
χ
1
6) K CELL (Cell constant) sets the conductivity probe's cell constant nominal value. The val-
ues 0.1, 0.7, 1.0 and 10 cm
-1
(with tolerances from –30% to +50% of nominal value) are
admitted. The cell constant must be inserted before starting the probe calibration. An ERR
signal is generated if the cell constant's actual value exceeds the limits –30% or +50% of
nominal value. In this case it is necessary to check that the value set is correct, that the cali-
bration solutions are in good state, and then proceed with a new calibration.
The cell constant change entails resetting the calibration date: a new calibration updates the
calibration date.
7) LAST CAL m/d h/m (Last conductivity calibration) : the display shows the month and
day (m/d) in the main line, and the hour and minutes (h/m) in the secondary line of the pre-
vious calibration of the conductivity probe. This menu item cannot be modified. The calibra-