Teledyne 2120XL, Operating Instructions Manual, Page: 63 / 85

Trace Nitrogen in Argon Analyzer Operation
Teledyne Analytical Instruments 51
the above to ENTER at
More
a second time. This will display a third
screen of system functions as shown below.
Model Out-cal Lin
Use the ◄► arrow keys to position the blinking over the Model
function, and press ENTER to display your specific Model information.
4.5.1.11 A
NALOG
O
UTPUT
C
ALIBRATION
(O
UT
_C
AL
)
For enhanced accuracy, this function allows the user to calibrate the
4 to 20 mA analog output to remove any offsets inherent in the PCB. A
DMM configured as a DC ammeter is needed. The DMM should be
connected across the output terminals of the 4 to 20 mA output to
monitor the output current. The range of adjustment is approximately
+/- 10% of scale (+/- 1.6 mA).
If the analyzer is equipped with a secondary 0-1 VDC output, this
function can be used to calibrate the 0 to 1 volt output as well by using a
digital voltmeter on the 0-1 volt output.
To enter the 4 to 20 mA output adjust function:
Press the
SYSTEM
key to display the first
System
menu. Use the
◄► arrow keys to position the blinking over the More function, and
press ENTER. Repeat the above to ENTER at More a second time. This
will display a third screen of system functions as shown below.
Model Out-cal Lin
Use the ◄► arrow keys to position the blinking over the Out_cal
function, and press ENTER. The following screen will appear:
Use UP/DOWN arrow to
Adjust 4 ma: 500
The current value associated with the 4 mA output will be
blinking. Use the ▲ / ▼ arrow keys to adjust it up or down. When the
desired value appears, Press ENTER to accept and save the value and
the display automatically moves to the next line for adjusting the 20 mA
setting.
Use UP/DOWN arrow to
Adjust 20 ma: 500