8.4 Analog output level test
If you need to verify that the signal from the HMT370EX transmitter's analog output channel is
correct, you can force the output of the channel to a specific value and measure the output
level with a multimeter.
The analog output level tested can be carried out either with the local display interface or
using Vaisala Insight PC software.
mA
Test Points
CH1
CH2
mA
V
V
20.0 mA
Figure 59 Multimeter test point overview
The transmitter body enclosure must not be opened in an explosion
hazardous area, unless a safe work permit has been issued in accordance with
the standard IEC 60079-14. Either remove the transmitter from the hazardous
area before opening the enclosure, or ensure that an IEC 60079-14 compliant
safe work procedure has been implemented in the hazardous area.
CAUTION!
Always use an Ex compliant multimeter. The output parameters of the multimeter
must be compatible with the input parameters of the transmitter.
8.4.1 Testing analog output level with local display interface
If you want to verify the output level of an analog output channel, test the connection as
follows:
1. Detach the probe body and open the transmitter cover.
2. Connect a multimeter to the mA testing points located above the output screw terminals
on the transmitter component board (see Figure 59 (page 111)).
Chapter 8 – Analog output configuration
111
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