3.a.6 FILTER: FILTER KEY
For the Model 3530 LVDT Conditioner, Model 3560 Voltage Conditioner,
Model 3570 DC Strain Gage Conditioner, and Model 3578 AC Strain Gage
Conditioner, you can select a low-pass corner frequency of 5, 10, or 20 Hz for
the instrument's analog filter. For the Model 3540 Frequency Conditioner, you
can select a frequency of 2.5, 5, or 10 Hz for this filter. There is NO selectable
analog filtering for the Model 3510 Thermocouple Conditioner.
For ALL conditioners, you can set the magnitude of the smoothing constant for
the digital filter. The effect of the digital filter is to remove small unwanted dynam-
ic signal components, while allowing large-scale fluctuations to pass unaffected.
To set either or both filters,
a. Once you are in SETUP MODE, press the button labelled
The unit will display "FILTR" (for "FILTER"):
b. Press either the FILTER or the ENTER button. Unless your unit is a Model
3510 Thermocouple Conditioner, it will display "ANALG" (for "ANALOG"):
If your unit is a Model 3510, it will display "DGTAL" (for "DIGITAL"); proceed to
Step f, below.
c. If you don't want to display the current ANALOG FILTER setting, press FILTER
again and proceed to Step f. To display the analog filter setting, press
If, for example, the current filter "response" is 5 Hz, the unit would display
d. To change the analog filter response, you can cycle forwards or backwards
through the allowed settings by pressing the top or bottom segment, respec-
tively, of any digit display (even if it is blank). Allowed "RS" values for the
Model 3540 Frequency Conditioner are "2" (for "2.5"), "5," and "10"; for all
other conditioners with selectable analog filtering, they are "5," "10," and "20."
For filter frequency characteristics and step-response settling times, see
Appendix A.
e. When the desired filter setting appears, press ENTER. The unit will then dis-
play "DGTAL" (for "DIGITAL"):
3.12
3
SETUP: INSTRUMENT CONFIGURATION
3.a CONFIGURING THROUGH THE FRONT PANEL
FILTER
ENTER
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