Lake Shore Model 421, Руководство пользователя

Страница: 23 / 92

Lake Shore Model 421 Gaussmeter User’s Manual
Operation 3-5
3.5 MANUAL RANGE AND AUTO RANGE
The Model 421 is capable of reading each of the Lake Shore probe types: High Stability (HST),
High Sensitivity (HSE), or Ultra-High Sensitivity (UHS). The three probes permit the Model 421 to be
used with ranges of 300 mG to 300 kG. The full-scale ranges for each probe type, along with the
display resolution, are shown as follows.
Range
DC Resolution
with Filter
DC Resolution
without Filter
AC RMS
Resolution
HST Probe
300 kG
30 kG
3 kG
300 G
0.01 kG
0.001 kG
0.0001 kG
0.01 G
0.1 kG
0.01 kG
0.001 kG
0.1 G
0.1 kG
0.01 kG
0.001 kG
0.1 G
HSE Probe
30 kG
3 kG
300 G
30 G
0.001 kG
0.0001 kG
0.01 G
0.001 G
0.01 kG
0.001 kG
0.1 G
0.01 G
0.01 kG
0.001 kG
0.1 G
0.01 G
UHS Probe
30 G
3 G
300 mG
0.001 G
0.0001 G
0.01 mG
0.01 G
0.001 G
0.1 mG
0.01 G
0.001 G
0.1 mG
For manual ranging, pressing the
Range key and the following display will appear.
Select With °®
+/- 3.000 kG
Use the
s
or
t
keys to toggle through the allowable full scale ranges for the probe installed. Press the
Enter key to accept the new setting.
In Auto Range mode, the Model 421 selects the range with the best resolution for the field being
measured. It can take up to 2 seconds for Auto Range to work, so manual ranging may be better in
some conditions. Press the
Range key.
Select With °®
Auto Range
Use the
s
or
t
keys to toggle through the allowable full scale ranges until
Auto Range
is displayed.
Press the Enter key to accept the new setting.
Auto Range should not be used with Max Hold operation or when alarms are active. Also, Auto Range
should not be used when measuring small fields in a large background field, i.e., measuring a small DC
field in presence of a large AC field, or measuring a small AC field in the presence of a large DC field.