46 The Setup Menus
7.11 Setting the Auto Survey Mode
Use one of the Auto Survey modes to control how and when the clock determines position infor-
mation. The accuracy of the position (and indirectly, time) is based on averaging the assigned
number of position fixes surveyed, either during startup or by a single survey. At the conclusion
of a survey, the averaged position is placed into memory and the clock is placed in Position Hold
mode. If accurate position information is used, this results in a reduced standard deviation for the
time data. For RS-232 command, see Section 10.2.10.
There are five Auto Survey modes available:
1. Turn Off Survey – halt the survey in progress
2. Single Survey – initiate a new survey at this time
3. Power-On Survey – initiate a new survey when the clock is powered on
4. Suspend Survey – pause a survey in progress
5. Resume Survey – resume a survey that was paused
SET AUTO SURVEY?
ENTER
SETUP
SELECT SURVEY MODE?
POWER-ON SURVEY
RESUME SURVEY
SUSPEND SURVEY
POWER-ON SURVEY*
SINGLE SURVEY
TURN OFF SURVEY
DOWN
UP
SET # OF FIXES
60 (1 Mn or more)
86400
|
300
60 *
1
* = Default setting
DOWN
UP
ENTER
ENTER
Figure 7.18: Survey Mode Setup
7.11.1 Number of Fixes
Auto Survey configuration presents a list of possible surveys from 1 to 86,400 seconds (approx. 24
hours). Surveys are listed as 1 (single fix), 60 (1 minute or more), 300 (5 minutes or more), 900 (15
minutes or more), 1800 (30 minutes or more), 3600 (1 hour or more), 7200 (2 hours or more), 14400
(4 hours or more), 28800 (8 hours or more), 43200 (12 hours or more), and 86400 (24 hours or
more). To complete a survey, the GPS receiver must be tracking at least four satellites. If, during
a survey, the number of satellites being tracked drops below four, the survey will pause until the
GPS receiver again begins tracking four or more satellites. Then, the survey will resume computing
positions until completion.
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