Testing analog outputs - HMT120

HMT120 User Guide
Document code
M211244EN
Revision
D
Language
English
Product
HMT120
Document type
User guide
The transmitter has a built-in software function for testing analog outputs. To test the outputs:
  1. Make sure the transmitter is not in adjustment mode (see Calibration and adjustment overview).
  2. Press the + adjustment button (see Figure 1).

    This sets the output current level to the high point of the analog output range (20 mA nominal). The output stays at this level for about 30 seconds after the + adjustment button has been pressed.

  3. Press the - adjustment button.
    This sets the output current level to the low point of the analog output range (4 mA nominal). The output stays at this level for about 30 seconds after the - adjustment button has been pressed.
HMT120 analog output current can be measured without removing the wires from the screw terminals by using a low-impedance multimeter between the associated + terminal and test point (CH1 or CH2) on the component board (see Figure 1).
Figure 1. HMT120 output current measurement
If your transmitter has the optional display, the following texts are shown on the display the during analog output test:
  • Analog output test high: analog output set to upper limit (20 mA)
  • Analog output test low: analog output set to low limit (4 mA)