13
O&M Manual
Rev-B (7/15)
Part 4 – Configuration
4.1
General
To turn the system ON, simply press and hold the MENU key for approximately 5
seconds and the display will come on.
To turn the unit off, press and hold the
ENTER key until the display shuts off (about 3 seconds). Note that the unit
must be in the MEASURE menu in order for the 3-second key press to
operate.
The instrument will turn off automatically after 30 minutes if no keys are
pressed
– optimizing battery life. This mode of operation is ideal for portable
operation where intermediate readings are being taken. Assuming the instrument
is used perhaps an hour per day, this would result in a battery lifespan of about
240 hours. For continuous operation with no automatic shut-off, turn the Auto-
OFF feature to OFF in the DIAG menu. This mode is intended for use when the
instrument outputs are used for transmitting data. In this mode, the instrument
will run continuously until the battery reaches the shut-down level (1.6V). It
should be noted that rechargeable AA batteries reduce operational times
dramatically, as they typically contain much less energy than standard batteries.
The PWR switch disconnects the AA batteries and is only used to disconnect the
battery if the system is not to be used for a long period of time (> 3 months of
storage). Otherwise, leave this switch in the ON position. The red dip switch is
only for factory use.
The "
B
" will flash on the display next to the main measurement indication when
the instrument requires battery replacement. If the battery is not replaced,
eventually the unit may not turn on in the normal operating mode. Once the low
battery condition is indicated, the instrument will only stay powered for 10
minutes.
4.2
Battery / Power Circuit Board
Q45H monitors are powered by internal AA alkaline batteries Figure 5 shows this
board assembly with batteries installed.
The battery circuit board contains 3 switch assemblies as shown in the drawings.
.
