- -
10
REL key
In measurement mode, displays for both measurements -
mV
and
temperature
- the difference be-
tween the current value and that measured on pressing the key. The
REL
message appears on the
display; press the key again to return to the current measurement.
LOG/DumpLOG key
In measurement mode, this function starts and stops the logging of a data block to be saved in the
instrument's internal memory. The data logging frequency is set in the
"Print and log interval"
menu parameter. The data logged between a start and subsequent stop represent a single session.
When the logging function is on, the LOG indication is displayed, the battery symbol blinks and a
beep is issued each time a logging occurs;
the battery symbol does not appear when using an
external power supply
.
To end the logging, press LOG.
If the Auto-HOLD function is enabled (please see the menu), the data logging is disabled.
The HD3405.2 can turn off during logging between one capture and the next: the function is
controlled by the
Sleep_Mode_LOG
parameter. When the logging interval is less than one minute,
the logging instrument remains on; with an interval of at least one minute, it turns off between one
capture and the next if the parameter
Sleep_Mode_LOG
=YES.
>>>
(Dump LOG)
When the LOG key is pressed after the MENU key, the transfer of the logged data on the serial port
is started.
Please see the paragraph dedicated to data transfer on page 29.
pH/mV-key
Changes the main variable measurement between pH and mV. The selected parameter is used for
display, printing, and logging.
The instrument has an Auto-Hold function, which can be set in the MENU, that “freezes” the meas-
urement automatically when it has been stable (within 1 mV) for over 10 seconds: the message
HOLD is displayed.
To perform a new measurement, it is necessary to press the pH/mV key.
The HOLD message starts blinking, while the display follows the actual measurement trend, until it
stabilizes again and the HOLD message remains still.
