VELTRON DPT-
plus
Air Monitor Corporation
116-010-91.P65 (09/18/09)
VELTRON DPT-
plus
- IO&M Manual
SECTION 6 – CALIBRATION
6.4 – TRANSMITTER OUTPUT CALIBRATION
1. Scroll Main Menu to:
Transmitter Output
Calibration
2. Press , and display will indicate:
Output 1 Zero
3. Press , and display will indicate:
Output 1 Zero
Perform Calibration
4. Connect a DMM set for mADC in series with Output 1
(see Section 4.5). DMM should be reading minimum
value of 4.00 ± 0.01mA.
5. If DMM is reading out of tolerance, use or to adjust VELTRON DPT-
plus
output for an acceptable DMM
reading.
Depending on DMM's selected range, the or button may need to be pressed and held for a period of time
before any change occurs in the DMM's display. To speed up changes in output, pushbutton combinations can
be used. The following chart lists these combinations along with the associated change in output.
PUSHBUTTON COMBINATION
4-20mA
only
+0.001mA
only
–0.001mA
+0.01mA
-0.01mA
+0.1mA
–0.1mA
+1.0mA
–1.0mA
*Must be pressed and held before other button(s) are pressed.
51
X
+
*
X
+
*
+
*
+
*
X
+
*
and
X
+
*
and
