F) Check for magnetic objects near sensor. Examples
would be buildings, surface metal, objects on the
operator, etc.
G) Check for proximity of power lines. (Move away from
lines and repeat step 2.)
H) Check for low battery voltage.
DATA ERR ON DISPLAY:
(data error)
A) Power interrupted while taking a sample. (Push any
key twice to make magnetometer continue to operate
in Data Err mode.)
B) Lithium battery dead. (Contact Factory.)
CLEAR DATA ERROR:
A) First save any data that is stored by outputting data to
computer (Push the
[ OUTPUT ]
button twice, then
press
[ ENTER ]
to start output).
B) Next press
[ ERASE ]
button twice, while displaying
DATA ERR, to clear data error.
Note: This will also erase all data.
NO DISPLAY:
A) Check battery cable connection.
LO BATT SIGNAL ON DISPLAY:
A) Replace battery.
DISPLAY READS FULL:
A) Memory is full. (Operator needs to output data to
computer and then erase memory.)
DISPLAY READS GPS ERR
A) GPS is not connected or not receiving fix. (Connect
GPS or change GPS Mode to Off)
UNIT FAILS TO OPERATE WITH GOOD BATTERIES:
A) Remove batteries, press Reset Switch (SW2) inside
case. (Contact Factory.)
If troubleshooting with manual fails to solve problem, call
Geometrics
Inc., Customer Service Department at:
(408) 428-4254 or (408) 428-4236.
PN 16606-02 Rev. X1
GEOMETRICS INC.
G857 Magnetometer
Pocket Reference Guide
NOTE: TUNE BEFORE SURVEYING
TUNING
1. Tune Magnetometer to highest signal value by taking a
reading and then holding
[ TUNE ]
button down to read
signal strength. Signal strength should be higher than
3.0 at best tuning value.
2. Check repeatability by cycling magnetometer a few
times quickly in one spot. Repeatability should be
better than 1.0 gamma.
3. Set Time, Julian Date and Line Number. Line Number
should not be set to zero.
4. Begin survey.
TROUBLESHOOTING
LAST DIGIT TRUNCATES (blanks out) or poor
repeatability:
A) Check Tuning and Signal Strength.
B) Check cables and connectors for broken contact.
C) Check Auto Cap Tuning Value by pushing
[ AUTO ], [ TUNE ], [ SHIFT ].
Value should read 00.2
for standard cable. Push
[ CLEAR ]
to escape without
changing values.
D) Check to make sure sensor and cables are not moving
while cycling the unit.
E) Check sensor for broken/loose coils inside. Check
sensor for level of fluid. (Some sloshing is normal.)
(Continued on Back Page)
2190 Fortune Dr., San Jose, CA 95131
Telephone (408) 954-0522
FAX: (408) 954-0902
