4 .4 . 9 I n p u t N a m e 53
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TC = 0.1 / (ln (N / (N - 1)), where TC is one time constant, and N is the number of filter
points. A reading is usually considered settled after six time constants.
TABLE 4-9
shows a sampling of filter settings and the resulting time constant, settle time, and
equivalent noise bandwidth.
The filter window is a limit for restarting the filter. If a single reading is different from
the filter value by more than the limit, the instrument will assume the change was
intentional and restart the filter. Filter window is set in percent of full scale range.
Menu Navigation:
Input SetupQInput (A, or B)Q QFilter (Off or On)
Input SetupQInput (A, or B)Q QFilter Points (2 to 64)
Input SetupQInput (A, or B)Q QFilter Window (1% to 10%)
Default:
FilterQ(Off)
Filter PointsQ8
Filter WindowQ10%
Interface: FILTER
4.4.9 Input Name
To increase usability and reduce confusion, the Model 335 provides a means of
assigning a name to each sensor input. The designated input name is displayed on the
front panel when the A or B keys are pressed, identifying the respective sensor. The
input name can also be configured to be displayed when using the custom display
mode. Refer to
section 4.2.3 for Alpha-Numeric entry.
Depending on the display mode you have chosen, the input name may show only nine
characters.
Menu Navigation:
Input SetupQInput (A, or B)Q QInput Name (15 character string)
Default: Input (A, or B)
Interface Command: INNAME
4.4.10 Temperature
Limit
The Temperature Limit parameter provides a means of protecting your equipment
from damage by shutting down all control outputs when the assigned temperature
limit is exceeded on the sensor input. The parameter is available for both sensor
inputs. A temperature limit of 0 K (default value) turns this feature off.
Menu Navigation:
Input SetupQInput (A, or B)Q QTemperature Limit (0 K to 2999 K)
Default: 0.0000 K
Interface Command: TLIMIT
Filter points Time constant
Settle time
(6 time constants)
Equivalent noise
bandwidth (p TC)
2 0.14 s 0.9 s 1.733 Hz
4 0.35 s 2.1 s 0.719 Hz
8 0.75 s 4.5 s 0.334 Hz
16 1.55 s 9.3 s 0.161 Hz
32 3.15 s 18.9 s 0.079 Hz
64 6.35 s 38.1 s 0.039 Hz
TABLE 4-9 Filter settle time and bandwidth
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