HT instruments HT8000 - Manual (Page 12)

HT8000
EN - 11
4.3.5. Loop current measurement of external transducers
CAUTION
 In this mode the instrument generate a fixed output voltage of 24VDC
which permits to supply an external transducer and perform the
simultaneous current measurement on it
 Maximum input for DC current is 24mA. Do not attempt to take any current
measurement exceeding such limit to avoid the risk of electrical shock and
damages to the instrument
Fig. 6: Loop current measurement of external transducers
1. Switch OFF the circuit under test
2. Press INPUT/OUTPUT key and select the measurement mode. The “INPUT” symbol is
displayed
3. Press mA/% key and select the desired measurement unit. The symbol “mA” or “mA%”
is displayed
4. Insert the red plug into +LOOP jack and the black plug into mA jack
5. Connect red and black plugs to the external transducer respecting the polarity and
current flow (see Fig. 6).
6. Power the circuit under test. The current value will be displayed
7. The message "O.L" means that the current exceeds the measuring limits. For the
generation of a negative value of voltage connect the test leads in the opposite
direction than shown in Fig. 6