Delta OHM HD3406.2, User Manual, Page: 10 / 44

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REL Key
In measurement mode, it displays the difference between 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 cur-
rent 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 HD3406.2 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 30.
χ
- Ω -TDS (conductivity - resistivity - total dissolved solids - salinity) key
Changes the main variable measurement between conductivity, resistivity, total dissolved solids
(TDS) and salinity. 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 digit) for over 10 seconds: the message
HOLD is displayed.
To perform a new measurement, it is necessary to press the FUNC key.
The HOLD message starts blinking, while the display follows the actual measurement trend, until it
stabilizes again and the HOLD message remains still.