Panametrics DigitalFlow XMT868i, Service Manual, Page: 13 / 74

DigitalFlow™ XMT868i Service Manual 5
Chapter 1. Calibration
1.4.1 Preparing for Calibration
Prepare for the calibration procedure by connecting a Slot 0 analog output (or an independent calibrated current
source) to the desired input on the option card. See Figure 4 on page 12 to identify the
IN
( +) and RTN(-) pins for the
desired input on terminal block J2.
Note: The zero point of the analog input may be set for either 0 mA or 4 mA. However, the calibration always uses
the 4 mA point, as the meter extrapolates this value to obtain the 0 mA point.
1.4.2 Accessing the Calibration/Test Menu
1. From the Keypad Program , press the right arrow key to scroll to the CALIB menu. Press
[Enter].
2. In the Cal window, scroll to Slot 1 . Press
[Enter].
3. Scroll to the desired Input to open the ANALOG INPUT menu. ( Input A will be used as an example in this manual.)
Press
[Enter].
IMPORTANT: Calibrating Input B, C or D is identical to calibrating Input A . However, be sure to reconnect the current
source on terminal block J2 . See Figure 4 on page 12 for the correct pin numbers.
4. Scroll to the appropriate option to select the reference point to be calibrated. Press
[Enter].
IMPORTANT: The procedure for calibrating all the inputs is the same. However, when calibrating a different input, be
sure to reconnect the current source at terminal block J2 . See Figure 4 on page 12 for the correct pin
numbers.
5. Do one of the following:
• Proceed to 4 mA Option below.
• Proceed to 20 mA Option below.
1.4.2.1 4 mA Option
Set the calibrated current source to 4 mA.
•
If you selected the 4 mA option in the ANALOG INPUT menu, scroll to STORE to accept the current 4 mA value or on
ABORT to cancel the entry. Press
[Enter].
In either case, the XMT868i returns to the Analog Input window.
1.4.2.2 20 mA Option
Set the calibrated current source to 20 mA.
•
If you selected the 20 mA option in the ANALOG INPUT option, scroll STORE to accept the current 20 mA value or to
ABORT to cancel the entry. Press
[Enter].
In either case, the XMT868i returns to the ANALOG INPUT window.
• Press
[Escape]
to return to the Slot 1 window and calibrate additional inputs/outputs, or press
[Escape]
again to
close the CALIB menu.