HT instruments HT8051 - Manual (Page 13)

HT8051
EN - 12
4.3.5. Measuring output DC current from external transducers (Loop)
CAUTION
 In this mode, the instrument provides a fixed output voltage of
25VDC±10% capable of supplying an external transducer and allowing
measuring current at the same time.
 The maximum output DC current is 24mA. Do not measure currents
exceeding the limits given in this manual. Exceeding these limits could
result in electrical shocks to the user and damage to the instrument.
Fig. 7: Measuring output DC current from external transducers (Loop)
1. Cut off power supply from the circuit to be measured
2. Press the MODE key and select the measuring mode MEAS LOOP mA. Symbols
“MEAS” and “LOOP” appear on the display.
3. Insert the green cable into the input terminal Loop and the black cable into the input
terminal mA
4. Connect the green lead and the black lead to the external transducer, respecting
current polarity and direction (see Fig. 7).
5. Supply the circuit to be measured. The display shows the value of current.
6. The message “-OL-” indicates that the current being measured exceeds the maximum
value measurable by the instrument. To generate a negative voltage value, turn the
measuring leads in the opposite direction with respect to the connection in Fig. 7