GE CTF878, User & Service Manual

Page: 38 / 72

Calibration 3-7
February 2009
Calibrating (verifying the
accuracy of) Digital
Outputs
To verify the accuracy of a Digital Output, you must connect a
frequency counter to the digital output. Proceeding as above, select
the desired option for the Digital Output to be verified, and press
[
ENTER
]. The screen appears as in Figure 3-6 below. Step through
options using the arrow keys.
Figure 3-6: Calibrate Digital Outputs Window
To verify the accuracy of a digital output using the frequency, follow
these instructions:
1.
The first prompt asks you to enter the frequency.
a.
Press
[ENTER]
to open the text box.
b.
Use the numeric keys to enter the desired value.
c.
Press
[ENTER]
to confirm your entry.
2.
Press the [
X
] arrow key to move to the SET box, and then press
[ENTER]
to set the frequency value entered.
3.
Compare the value entered with the reading on the frequency
counter. They should be very close (within ±1 Hz for frequencies
below 1 KHz).
To verify the accuracy of the digital output using the totalizer, follow
these instructions:
4.
The next prompt asks you to enter the total number of pulses.
a.
Press
[ENTER]
to open the text box.
b.
Use the numeric keys to enter the desired value.
c.
Press
[ENTER]
to confirm your entry.
Calibrate Analog Input
4
Exit
Hz Freq
Total 50 Pulses
SET
SET
Totalizer/Frequency 3:0
1000