UEi Test Instruments AQM4 - Manual (Page 8)

7
DATA HOLD
In normal display mode, press to freeze
the readings, the "HOLD" icon is displayed
on the left top of the LCD (Fig. 9). All current
readings are kept unchanged. Press
to cycle through all held readings.
While in "HOLD" mode, STEL and TWA will
continue updating every 5 minutes.
BACKLIGHT
The backlight will be activated for 10
seconds by pressing any key.
MIN, MAX, STEL, TWA
This meter allows you to check the minimum
and maximum, STEL and TWA values
calculated since power on. Under normal
mode, press to see the minimum,
maximum, STEL and TWA and real time
sequence. Each press of , displays
MIN, MAX, STEL, TWA in sequence and
returns to current value (Fig 10 - 13). STEL
and TWA values are calculated for CO² only.
If the meter is turned on for less than
15 minutes, the STEL value will be the
weighted average of readings taken since
power on. This is also true for TWA values
displayed prior to 8 hours. It takes at least
5 minutes to calculate STEL and TWA.
The display shows "----" during the first 5
minutes from power on.