Lake Shore Model 475 Gaussmeter User’s Manual
5-4
Advanced Operation
User Programmable Cable (Continued)
If a valid HMCBL cable is attached, the next MCBL Program screen appears as a prompt for serial number entry.
Ent er f or MCBL
Sn u m 1 0 0 0 0 0 0 0 0 0
Use the number entry keys to enter the numeric serial number, up to 10 digits. Press
Enter
to accept the new value and
continue to the next setting screen. If desired, press
Escape
to restart the setting sequence and enter a new value. Press
Escape
again to cancel the sequence and return to the normal display.
The next MCBL program screen appears as a prompt for entering the Hall generator control current (Note that the
current selected can alter the sensitivity. See the paragraph below). Most Lake Shore Hall sensors are specified at 100
mA. A current other than 100 mA can be used.
Sel ec t Wi t h ° ®
Ha l l Cu r r e n t : 1 0 0 mA
Use the
s
or
t
key to select the Hall control current to be used. Press
Enter
to accept the new selection and continue to
the next setting screen.
The next MCBL program screen appears as a prompt for entering the nominal sensitivity in mV/kG. This sensitivity is
based on the control current to be used (1 mA, 10 mA, or 100 mA). Note that the sensitivity of Lake Shore Hall sensors
is specified at 100 mA in most cases. (For instance, if a current of 10 mA is used for a Hall sensor with a sensitivity
specified at 100 mA, the proper sensitivity to enter is approximately 0.1 that of the 100 mA value.)
Ent er f or MCBL
Se n s +1 . 0 0 0 0 0 mV/ k G
Use the data entry keys to enter the nominal sensitivity value from one of the following ranges: between 0.550 and 1.100
mV/kG; between 5.500 and 11.000 mV/kG; and between 550 and 1100 mV/kG (when using a control current of 100
mA). Press
Enter
to accept the new value and return to the normal display. If desired, press
Escape
to restart the setting
sequence and enter a new value. Press
Escape
again to cancel the sequence and return to the normal display.
The Model 475 will adjust the available ranges based on the values entered for the current and sensitivity.
NOTE:
Using a sensitivity outside the above 100 mA ranges (or their equivalent 10 mA, and 1 mA ranges) may
cause reduced performance. Values near, but lower than the “55” minimum will reduce resolution.
Values near, but above the “11” maximum may cause an instrument overload “OL” condition before full
scale range is reached. Hence, using Hall generators with sensitivities outside the above-indicated ranges
is discouraged.
All of the above entries will be stored in the HMCBL cable PROM (located in the connector). Thus, any time the
cable/Hall generator combination is used, the Model 475 will recognize the stored parameters, and operation may
proceed. The HMCBL cables may be reprogrammed for other Hall generators as needed.
A Hall generator can be connected directly to the Model 475 without using an HMCBL cable. Probe parameters can be
configured as stated above but the settings will be lost if power is cycled.
