Vaisala HMT370EX Guide D'installation page 20

8. Optional: if you want to verify the output level of the analog output channels, test the
connection as follows:
a. Detach the probe body and open the transmitter cover.
b. Connect a multimeter to the mA testing points located above the output screw
terminals on the transmitter component board (see illustration page 2 in the
beginning of the document for the location of the terminals).
Always use an Ex compliant multimeter. The output parameters of the
multimeter must be compatible with the input parameters of the
transmitter.
c. Start the output test mode either by using the transmitter display interface, or, if
using a transmitter without a display, by connecting the transmitter to Insight PC
software. For instructions on using the output test mode with the display interface
and Insight PC software, see HMT370EX User Guide.
d. After verifying the output, remove the multimeter, close the transmitter cover, and
reattach the probe body.
Test Points
V
mA
CH1
Figure 4 Multimeter test point overview
CAUTION!
area. Either remove the transmitter from the hazardous area or ensure that a
safe work procedure has been implemented in the hazardous area. Only use the
Vaisala accessory PC connection cable with the service port.
16
V
mA
−
CH2
The service port (see
+
20.0 mA
Figure 2 (page 9)) must only be used in a safe
M212306EN-A