Panametrics CTF878, Руководство по обслуживанию

Страница: 35 / 67

Model CTF878 Service Manual 25
Chapter 3.
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.
3.1.6 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 24 on page 20.
3.1.6.1 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 30 below.
Figure 29: 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.
3.1.6.2 Calibrating RTD’s
The RTD calibration procedure consists of setting the low and high temperature readings.
To calibrate an RTD you must connect an RTD to the RTD board. Proceeding as above, select the desired Calibrate
RTD option, and press [
ENTER
]. The screen appears as in Figure 30 below. Step through options using the arrow keys.
Site Program Meter Logging
Counts = 65535
Press 'Cancel' to exit or 'OK' for
another reading
Cancel OK
Service
RTD Test