Lake Shore Model 475 Gaussmeter User’s Manual
Advanced Operation
5-1
CHAPTER 5
ADVANCED OPERATION
5.0
GENERAL
This chapter provides information on advanced operations for the Model 475 DSP Gaussmeter.
5.1
PROBE MANAGEMENT
The Model 475 has several capabilities that allow the best possible measurements with Lake Shore probes. These
firmware-based features work in tandem with probe calibration and programming to ensure accurate, repeatable
measurements and ease of setup. Many of the features require probe characteristics that are stored in non-volatile
memory located in the probe connector during calibration.
5.1.1
Clear Probe Zero Calibration
In some instances, it may be useful to cancel the results of the zero probe function. This could be of value if the probe
was zeroed improperly or if the user suspected that the probe was damaged. By canceling the results of the zero probe
function, the instrument is returned to a known calibrated state.
NOTE:
The zero probe function clears zeros before beginning the calibration procedure.
To cancel the effects of the zero probe function,
press and hold
the
Zero Probe
key for approximately 4 seconds. The
screen appears as a prompt for clearing the zero probe function.
Sel ec t Wi t h ° ®
Cl e a r Ze r o s No
Use the
s
or
t
key to select Yes or No. Press
Enter
to accept the new selection and return to the normal display. Press
Escape
to cancel the selection and return to the normal display.
5.1.2
Probe Serial Number
The serial number of the probe presently attached can be viewed from the display of the Model 475. This feature can also
be used to check the programming of extension cables. To view the serial number, press the
Probe
key. The following
screen will appear for approximately 6 seconds.
Pr obe SN XXXXXXXXXX
Where XXXXXXXXXX, is the serial number of the attached probe, up to 10 digits in length.
5.1.3
Field and Temperature Compensation
NOTE:
Unless there is a specific reason, Lake Shore strongly advises customers
not
to turn field and temperature
compensation off; it may reduce reading accuracy substantially.
To improve accuracy, all Lake Shore probes have a magnetic field compensation table stored in a PROM. Turning Field
Compensation OFF causes the Model 475 to ignore this table and calculate the field based on a nominal probe
sensitivity.
