4.4.9 Input Sensor Name
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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.
Filter settle time and bandwidth
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
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 Setup
Q
Input
(
A
, or
B
)
Q
ENTER
Q
Filter
(Off or On)
Input Setup
Q
Input
(
A
, or
B
)
Q
ENTER
Q
Filter Points
(2 to 64)
Input Setup
Q
Input
(
A
, or
B
)
Q
ENTER
Q
Filter Window
(1% to 10%)
Default:
Filter
Q
(Off )
Filter Points
Q
8
Filter Window
Q
10%
Interface:
FILTER
4.4.9 Input Sensor
Name
To increase usability and reduce confusion, the Model 335 provides a means of
assigning a name to each sensor input. The designated input sensor name is displayed
on the front panel when the
A
or
B
keys are pressed, identifying the respective sensor.
The input sensor 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 sensor name may show only
nine characters.
Menu Navigation:
Input Setup
Q
Input
(
A
, or
B
)
Q
ENTER
Q
Sensor 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 Setup
Q
Input
(
A
, or
B
)
Q
ENTER
Q
Temperature Limit
(0 K to 2999 K)
Default: 0.0000 K
Interface Command:
TLIMIT
TABLE 4-9
