Lake Shore 460, User Manual

Page: 46 / 132

Lake Shore Model 460 Gaussmeter User’s Manual
3-22
Operation
3.15 FACTORY DEFAULT SETTINGS
If the keypad is unlocked and the Model 460 is in local mode, the user may press and hold Escape key
for
≈
20 seconds to return the instrument to factory default settings shown below. Other gaussmeter
calibration information and probe data are not affected by this reset. The probe should be zeroed after
completing this operation.
AC/DC DC
Address 12
Alarm Off
Alarm Trigger Outside
Analog Out Default
Analog Out Source X
Audible Alarm On
Auto Range Off
Baud 300
Brightness 4
Display X,Y,Z On, Vector On
Fast Data Mode Off
Field Compensation On
Filter Off
Filter Number 8
Filter Window 1%
Gauss/Tesla Gauss
Keypad Not Locked
Keypad Setting Channel X
Local/Remote Local
Lock Code 123
Max Hold Off
Peak/RMS RMS
Range
Highest Range For Probe
Relative Off
Sleep Off
Temp. Compensation On
Terminators CR/LF
Vector Source XYZ
3.16 SPECIAL FUNCTIONS
The Model 460 Gaussmeter has some interesting special functions used with the various computer
interfaces. Fast Data Acquisition Mode is discussed in Paragraph 3.16.1. Analog Output Control Mode
in Paragraph 3.16.2. And finally, Sleep mode in Paragraph 3.16.3.
3.16.1 Fast Data Acquisition Mode
In normal operation, the instrument updates the display, computer interfaces, and the corrected
analog output at a rate of 4 readings per second. A Fast Data Mode has been included to increase
the data rate when operating with either the IEEE-488 or Serial Interface. While the corrected analog
output update rate does correspond to the Fast Data Mode, the front panel display will not operate in
this mode. Use the
FAST
command over one of the computer interfaces to activate this mode. When
in Fast Data Mode, the user will see the following front panel display:
Fa s t Da t a Mo d e
Without display overhead, the instrument can take 18 XYZ readings each second with Vector
Magnitude turned off, or 14 XYZ and Vector Magnitude readings each second with Vector Magnitude
turned on. An efficiently written IEEE-488 program can return all 18 XYZ (or 14 XYZV) readings using
the
ALLF?
command to query the field measurement data without slowing the instrument down. Use
the
ONOFF
command to turn the vector magnitude on or off. When the Vector Magnitude is turned off,
the instrument will still respond to the
ALLF?
command with four readings (X, Y, Z, and V), but the
fourth reading will consist of meaningless data that should be ignored. The Serial Interface is capable
of 14 readings per second in the Fast Data Mode. When using either interface, never try to read
faster than the update rate. Specific information on command syntax is provided in Paragraph 5.3.