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Lake Shore Model 450 Gaussmeter User’s Manual
3.16 FAST DATA MODE
In normal operation, the instrument updates the display, computer interfaces, and the corrected analog
output at a rate of 5 readings per second. Fast Data Mode increases 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. In Fast Data Mode, the
front panel screen displays the message below.
Fast
D a ta
Mode
To place the instrument in Fast Data Mode, use the interface command: FAST 1.
To leave fast data mode, use this command: FAST 0.
To query the status of Fast Data Mode, use this command: FAST? The unit returns 0 if Fast Data Mode
is Off, and 1 if On.
NOTE: Fast Data Mode activation disables the following Model 450 functions: Relative, Max Hold,
Alarms, and Autorange. Temperature compensation (if applicable) is based on the last
temperature reading prior to FAST DATA MODE activation. The temperature is not updated
during FAST DATA MODE.
Use the normal interface command to query field measurement data. Without display overhead, the
instrument can take 18 new readings each second. An efficiently written IEEE-488 program can return
all 18 readings without slowing the instrument down. When using the IEEE-488 Interface, never try to
read faster than 18 readings a second.
The additional overhead associated with Serial Communication slows instrument Serial Interface
communications to a maximum of 15 readings per second at 9600 Baud. When using the Serial
Interface, never try to read faster than 15 readings a second.
3-16
Operation