Panametrics CTF878, Service Manual

Page: 32 / 67

Chapter 3.
22 Model CTF878 Service Manual
3.1.4 Testing and Calibrating Analog Inputs
The Calibration/Test option can be used to test and calibrate the analog inputs. To enter the option, scroll to the
AnalogIns option under the Calibrate/Test Menu and press [ENTER] . The screen appears similar to Figure 24 on
page 20.
3.1.4.1 Testing Analog Inputs
To test an Analog Input, you must connect a current source to the analog input. Proceeding as above, select the Test
AnalogIn option for the Analog In to be tested, and press [ ENTER ]. The screen appears as in Figure 26 below. It
displays the analog input current RAW count from the A/D. When the input current changes, you can press [ F3] (OK)
to update the RAW count or [ F2 ] (Cancel) to exit.
Figure 26: AnalogIn Test Window
If you pressed [ F3 ] (OK), a clock appears in the middle of the screen with the message “ TESTING IO” below it. When
the test is complete, the screen returns to Operate Mode.
Repeat the process to test additional Analog Inputs.
Site Program Meter Logging
Counts = 65535
Press 'Cancel' to exit or 'OK' for
another reading
Cancel OK
Service
AnalogIn Test