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The HDOP (Horizontal Dilution of Precision) is a number that indicates the quality and preci-
sion of the received GPS data (low values are better than high).
A HDOP value <1 indicates a high precision position. HDOP signals between 1 and 5 indi-
cates an fair precision and DHOP values >5 a poor precision
When the GPS is used, the operating time for the LTL-XL is slightly decreased and you may
have to charge the battery more often.
1)
CEP (Circular Error Probable):
A statistical measure of the horizontal precision. The CEP value is defined as a circle's radius, when
centered at the true position, encloses 50% of the data points in a horizontal scatter plot. Thus, half the
data points are within a 2-D CEP circle and half are outside the circle.
Setup (basic and advanced)
Setup is used to separate between basic and advanced users. The basic settings reduce the
number of menus available to the user. For example, in basic menu operation, users cannot
clear the log.
The following menu points can be selected in basic mode:
Settings:
Measurement type: R
Log:
Diagnosis:
Help:
Auto Print
ADVANCED setting will provide access to all menu functions.
To change the setup, press
tween ADVANCED and BASIC. To return from setup press
26
User, Date & Time, Display, Sound and Temperature, Setup
, Qd, Wet timer, Timer alarm
L
View log
Instrument, Battery, Boards, GPS, System
All menus available
MENU
and select SETTINGS / SETUP. Pressing
LTL-XL Retroreflectometer
OK
will toggle be-
BACK
HOME.
or
DELTA
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