GE CTF878, Руководство пользователя и обслуживания

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February 2009
3-8 Calibration
Calibrating (Verifying the
Accuracy of) Digital
Outputs (cont.)
5.
Press the [
X
] arrow key to move to the SET box, and then press
[ENTER]
to set the number of pulses.
6.
Compare the value entered with the reading on the frequency
counter. They should be very close (within ±1 Hz for frequencies
below 1 KHz).
You have verified the accuracy of the digital outputs. To leave the
Totlizer/Frequency window, press [
F3
] to exit. The CTF878 returns to
Operate Mode.
Repeat the process to verify the accuracy of additional Digital
Outputs.
Testing and Calibrating
RTD’s
The Calibration/Test option can be used to test and calibrate RTD’s.
To enter the option, scroll to the RTDs option under the
Calibrate/Test Menu and press
[ENTER]
. The screen appears similar to
Figure 3-2 on page 3-2.
Testing RTD’s
To test an RTD, you must connect an RTD to the RTD board.
Proceeding as above, select the Test RTD option for the RTD to be
tested, and press [
ENTER
]. A clock appears in the middle of the screen
with the message “
TESTING IO”
below it. This is followed
immediately by a screen similar to Figure 3-8 below.
Figure 3-7: RTD Test Window
Note:
The window shows a count dependent on the output from the
RTD. When the output from the RTD changes, you can press
[
F3
] (OK) to update the count or [
F2
] (Cancel) to exit.
When the test is complete, press [
F2
] (Cancel) and the screen returns
to Operate Mode. Repeat the process to test additional RTD’s.
Site Program Meter Logging
Counts = 65535
Press 'Cancel' to exit or 'OK' for
another reading
Cancel OK
Service
RTD Test