- -
7
Hold function is enabled, the instrument performs the measurement and when it stabilizes it
goes in HOLD mode. To update the display indication, press “pH/mV” (please see the de-
scription of the pH/mV key for further explanation).
In the following figure you can see an example of the measurement process with the Auto-
Hold function enabled. A electrode is immersed into a liquid and, to perform the measure-
ment, the “pH/mV key is pressed”: The pH measurement raises progressively reaching the
final value. The HOLD symbol blinks. In the sketch indicated by 1, the measurement re-
mains stable for 10 seconds, within two digits: at the end of this interval (point 2), the in-
strument goes into HOLD mode, presenting the final stable value.
2 digit
10s
t
pH
pH
1
Press the “pH/mV” key again to carry out a new measurement.
4)
Print and log interval
sets the interval in seconds between two loggings or data transfers to
the serial port. The interval can be set from 0s, 1s, 5s, 10s, 15s, 30s, 60s (1min), 120s
(2min), 300s (5min), 600s (10min), 900s (15min), 1200s (20min), 1800s (30min) e 3600s (1
hour).
If the value 0 is set, SERIAL works on command: the sending of data to the se-
rial port is performed each time the key is pressed
. Recording (LOG) is performed with
one second intervals even if the interval is set to 0. With an interval from 1 to 3600s, con-
tinuous data transfer is started when the SERIAL key is pressed. To end the recording
(LOG) and
continuous
data transfer operations (SERIAL with an interval greater than 0),
press the same key again.
5)
Sleep_Mode_LOG
this function controls the instrument's automatic turning off during log-
ging, occurring between the capture of a sample and the next one. When the interval is lower
than 60 seconds, the instrument will always remain on. With intervals greater than or equal
to 60 seconds, it is possible to turn off the instrument between loggings: it will turn on at the
moment of sampling and will turn off immediately afterwards, thus increasing the battery
life. Using the arrows select
YES
and confirm using
ENTER
in order to enable the auto-
matic turning off, select
NO
and confirm to disable it and keep the instrument on continu-
ously.
Note: even if
Sleep_Mode_LOG=YES
is selected, the instrument does not turn off for less
than one minute intervals.
6)
LAST CAL m/d h/m (Last pH 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 last pH electrode
calibration. This menu item cannot be modified. The calibration year is not displayed.
7)
pH RES
: selects the number of leading digits for the pH measurement: using the arrows se-
lect 1.23 to obtain the pH hundredths or 1.234 to obtain the thousandths. The chosen resolu-
tion is applied to the new logged measurements, while the previous choice still applies for
the already memorized ones
Содержание Delta OHM HD3405.2
Страница 2: ...2 Temperature pH meter HD3405 2...
