Crystal DataLoggerXP - Manual (Page 17)

Page  • DataLogger
XP
User’s Manual
PEAK: When in data format 4, a reading is stored each time the PEAK key is
pressed. When in this mode there is no need to press and hold UNITS to begin
logging, although it is permissible to do so. If the unit has not already entered data
logging type, “Start” is briefly displayed. The PEAK key has no function except as
described above.
Operating.Behavior
Each time a data point is stored, the peak HI and LOW icons will blink, giving you visual feed back
as data points are recorded. While logging is active, the unit icon will blink. The blink rate indicates
the logging type the unit is in. When the gauge is in on demand logging type, the units icon will
blink on and off equally (i.e., on for the same amount of time as it is off). In all other modes, the
gauge blinks at a 3:1 on/off rate (i.e., on for three times as long as it is off). Note that when the
units of the gauge are user defined, no units icon will be lit at any time.
On/Off.Control
While in data logger mode, the gauge never actually turns off (even if the display is blank). This is
to maintain the accuracy of the real-time clock inside the unit. As a result, the operational life of
the unit is affected accordingly. When the unit is off, or displaying “d oFF”, it still draws about one-
half the power as it does in full operation. This means that a gauge in data logger mode displaying
“d oFF” will continue to draw down the batteries to a BATT condition, though half as fast as if the
gauge were left on continuously—approximately 3,000 hours. However, you cannot connect to
the gauge if “d oFF” is displayed – you must turn on the gauge to connect.
In addition, during logging in modes 1, 2, or 3, the ON/OFF key is disabled. If the ON/OFF key is
pressed, ON is displayed and the XP2i remains on. In logging type 4 (on demand), the ON/OFF key
will turn the unit off as described above.
If the unit is not logging, or is logging in on demand logging type, it can be placed in standby
mode as described above by pressing the ON/OFF button. If the unit has logged data, the display
will show “d oFF” to indicate that the gauge is in an off state, but contains data not yet transferred
to the computer.
XP2i.Reset.or.Battery.Change
Data collected by the XP2i will not be lost with a gauge reset or battery change, although any run
in progress will be stopped. In addition, a reset or battery change will affect the operation of the
gauge’s real-time clock. When the XP2i is connected to DataLoggerXP and the logging parameters
are set, DataLoggerXP also sets the gauge’s real-time clock. However, if the gauge resets, or if the
batteries are changed or become momentarily disconnected (if the gauge is dropped to the floor,
for instance), the real-time clock can be reset. When this occurs, the time stamps of subsequently
logged data will no longer be correct. DataLoggerXP reacts to this by attempting to resynchronize