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February 2009
Calibrating Analog Inputs
(cont.)
Testing and Calibrating
Digital Outputs
Testing Digital Outputs
3-6
4. Set the current source to output the current for the High point
(20 mA).
a. Press the [ ] arrow key to move to the Read box and press
[ENTER]
.
b. Scroll to the Calibrate box and press [ENTER] to calibrate the
high point.
5. If you are unsatisfied with the calibration, you can reset the inputs
to factory defaults. Press the [ ] arrow key to move to the Reset
[ENTER]
box, and then press
You have completed calibrating the inputs. To leave the Inputs
window,
•
[F2]
Press
(Cancel) to return to Operate Mode without
confirming the changes.
•
[F3]
Press
(OK) to confirm the new data. The CTF878 returns to
Operate Mode.
Repeat the process to calibrate additional Analog Inputs.
The Calibration/Test option can be used to test and calibrate (verify
the accuracy of) the digital outputs. To enter the option, scroll to the
Digital Outputs option under the Calibrate/Test Menu and press
[ENTER]
. The screen appears similar to Figure 3-2 on page 3-2.
To test a Digital Output, you must connect a frequency counter to the
digital output. Proceeding as above, select the option for the Digital
Output to be tested, and press [ENTER]. A clock appears in the middle
of the screen with the message "TESTING IO" below it while the
frequency counter is displaying the test frequency output. The test
frequency output should be a sweep from the low point to the high
point. When the test is complete, the screen returns to Operate Mode.
Repeat the process to test additional Digital Outputs.
to undo the calibration.
Calibration
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