Lake Shore 460, Руководство пользователя

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Lake Shore Model 460 Gaussmeter User’s Manual
3-12
Operation
3.9 RELATIVE SET AND RELATIVE ON/OFF
The relative function lets the user see small variations in larger fields. The setpoint (or center) of the
relative reading is set with the
Relative Set key. There are two ways to enter the relative setpoint. The
first method captures the field reading, nulling the present field. To use the relative function, first press
the desired channel. For this example, press the channel
X key. Then press the Relative Set key and
observe the following display.
En t e r Re l a t i v e Se t p .
- 0 . 0 9 2 2 k G
Us i n g - 0 . 8 5 6 3
Se t t i n g Ch a n n e l X
The first line is the just captured value (+0.0922 kG in the above example). The next line shows the
value the relative setpoint was previously using (+0.8563 kG). Press
Enter to accept the new setpoint
or Escape to retain the old value and quit the Relative Set function.
If the captured value is not what you want, then you may enter the exact field value using the numeric
keypad. Press the
Relative Set key and change the setpoint by pressing number keys or using the
s or t keys. Use the Select Range key to enter a setpoint different from the range currently being
displayed. Press Enter to accept the new setpoint or Escape to return to the old value.
Once the relative setpoint is established, push the Relative On/Off key to initiate the relative function.
The “Relative On” message is briefly shown in the proper line of the display. The display for that
channel will then show the plus or minus deviation from the setpoint. A small delta (s ) is displayed to
signify the relative display.
- 0 . 0 0 0 0 8 k G DC ¨
- 0 . 2 5 7 7 6 k G DC
- 0 . 9 0 9 5 2 k G DC
+ 0 . 9 4 8
1 1 k G XYZ
For example, Channel X is showing a –0.00008 kG relative reading from the +0.0922 kG captured
value.
The relative feature also interacts with other features. When alarm is active, the alarm points follow the
relative reading. Refer to Paragraph 3.10 for further information on setting alarms.
The Relative and Max Hold functions may be used at the same time. In this case, the relative reading
becomes the maximum deviation from the relative setpoint, and the DC is replaced with the MAX
indication. An example of Relative and Max Hold on at the same time is shown below.
- 0 . 0 0 0 0 8 k G MAX ¨
- 0 . 2 5 7 7 6 k G DC
- 0 . 9 0 9 5 2 k G DC
+ 0 . 9 4 8
1 1 k G XYZ
Pressing Max Hold again turns off the maximum hold function, returning the relative reading to the
display. Pressing the Relative On/Off key turns off the relative function. The “Relative Off” message is
briefly displayed.