Kaman digiVIT - Manual (Page 11)

www.kamansensors.com PART NO: 860525-001
Last Revised 9/16/2013
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slightly depending on the sample rate selected. If the time constant is 0.0 then no filter is used
and only the analog filter and the sample rate matter. The time constant displayed is
representative of how fast the system will respond to a step function. For example, a time
constant of 0.8ms will get to 95% of the step within 3 time constants or 2.4ms.
4.7.2 Sample Rate
The sample rate of the system can be changed from 5,000 to 10,000 samples per second.
5,000 samples per second are adequate for most applications and is the default. 10,000
samples per second can be selected for special applications when required. At 10,000 samples
per second, communication with the system over the Ethernet port could slow substantially as
the processor is busy most of the time servicing the analog outputs. If analog output only is
required, slower Ethernet communications should not be an issue.
4.7.3 Ethernet Setup
The Ethernet setup allows change of the IP Address and the UDP reader and writer ports for
connection to the unit.
4.7.4 Keypad Lockout
To prevent unauthorized access, the keypad can be disabled. When the keypad is locked out
none of the buttons on the front panel are active. To reactive the keypad press and hold the
diamond and up arrow buttons until the menu reappears
.
4.8 Adjust Output
4.8.1 Zero Output
This will set the displayed output of the system to zero. If a unipolar voltage output is selected
(0-5 or 0-10), output will be set to zero when the button is pressed. If a bipolar voltage output is
selected it will reference to 50% (zero for the bipolar output voltage) when the button is pressed.
This does not reset the range, so if a range with a unipolar output at 25% is zeroed, the display
may lose 25% of the output range. You can also zero the output by grounding the IO bit on the
terminal block.
4.8.2 2 Pt. Adjust
The 2 point adjust makes a slight adjustment to an existing calibration. It allows for correction of
installation or slight loading errors in gain and offset. For this calibration the sensor must be
positioned at MIN and MAX with data taken at each point. This adjustment does not optimize
the output further; it simply corrects scale and offset errors. Temperature coefficients are not
changed. It will remove any offset from zeroing the sensor output.