Lake Shore 480, User Manual, Page: 58 / 132

Lake Shore Model 480 Fluxmeter User’s Manual
5-16 Advanced Operation
Filter (Continued)
When the Filter is turned on, two additional displays appear. The first is Filter Points. The Filter Points
display sets the number of points to use in the filter algorithm.
Select­With­°®
Filter­Points­08
Use the  or  keys to increment or decrement the Filter Points number from 2 to 64 points (8 is the
default). The unit takes one point each update cycle, so filter settling time depends on update speed
and number of points. Press the
Enter key to accept the new setting or the Escape key to retain the old
setting and return to the normal display.
The Model 480 uses an exponential algorithm to smooth response. The settling time to full display
resolution is about the same as the number of filter points in seconds. For example, a setting of 10 filter
points settles in about 10 seconds.
The second display is Filter Window. The Filter Window display sets a limit for restarting the filter.
Select­With­°®
Filter­Window­10%
Press the Filter key or the  or  keys to increment or decrement the Filter Window percentage from
1% to 10% (1% is the default). Press the Enter key to accept the new setting or the Escape key to
retain the old setting and return to the normal display.
If a single field reading differs from the filter value by more than the limit specified, the instrument
assumes an intentional change and restarts the filter at the new reading value. This allows faster
instrument response to changing fields than if the filter functioned continually.
5.13 DISPLAY RESOLUTION
The DC Mode display resolution, or number of digits shown on the display, can be changed between
5¾ and 4¾ digits. The parameter does not change DC Peak, AC, or AC Peak resolution. To change the
display resolution, press and hold the
Filter key for 5 seconds. The following screen is displayed.
Select­With­°®
DC­Res:­5­3/4­Digits
Use the

or

keys to select 5¾ or 4¾ digits. Press the Enter key to accept it, or the Escape key to
retain the old setting and return to the normal display.
5.14 ALARM AND RELAY OPERATION
The alarm feature on the Model 480 has enough flexibility to support several Pass/Fail configurations in
addition to simple fault detection. A display annunciator and audible beeper signal an active alarm at
the instrument. Alarm states can be assigned to up to three relays for external monitoring or automated
control. If both peak readings are displayed the alarms follow the positive peak.