VOLTCRAFT 304 Bedienungsanleitung Seite 30

measuring value "MAX MIN" (flashing) are readable in turn. To leave
the function operate the push-button "MAX MIN" for about 2
seconds.
Note!
During maximum/minimum/average value recording the mea-
suring unit cannot be changed. Equally the function "REL" can-
not be activated.
b) Push-button "T1 – T2"
With this push-button you determine which display is visible: the
display of temperature T1 to T4 or the display of temperatures T1
and T2 (one beneath the other) or to the right of it the difference
from T1 – (minus) T2.
c) HOLD function
Whenever pushing this button (briefly) you switch the HOLD func-
tion on or off. HOLD means that the actual measuring value is kept
until the data-hold function is deactivated again. Switching over
from °C to °F or vice versa is not possible. Nor are the activation of
the time display or the "MAX MIN" function or the measurement of
the reference value "REL".
d) Measuring of Reference Value "REL"
With the push-button REL the reference-value measurement is star-
ted. To this aim the actual temperature display (T1 to T4) is set to
"0.0" independent of the measuring unit (°C or °F). Afterwards only
the difference values are displayed. If afterwards the measured tem-
perature at channel T1 is less e.g. by 5 degrees Celsius (°C), "–5°C"
is displayed. If, however, afterwards the measured temperature at
channel T1 is more by 25 degrees Fahrenheit, "25°F" is displayed.
To return to the actual temperature display you have only to opera-
te the push-button "REL" once more.
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