HT instruments HT401 - Manual (Page 10)

HT401
EN - 9
4.4. OPERATING INSTRUCTIONS
4.4.1. DC Voltage measurement
CAUTION
The maximum input DC voltage is 1000 V. Do not measure voltages
exceeding the limits given in this manual. Exceeding these limits could
result in electrical shocks to the user and damage to the instrument.
Fig. 2: DC voltage measurement
1. Select or positions
2. Press the MODE key to activate “DC” or “AC+ DC” modes (see § 4.3.2)
3. Press the RANGE key to activate manual range selection (see § 4.2.1) or use the
Autorange feature. If the voltage value is unknown select the maximum range
4. Insert the red cable into input lead V
 and the black cable into input lead COM
5. Position the red lead and the black lead respectively in the points with positive and
negative potential of the circuit to be measured (see Fig. 2). The voltage value is
shown on the display
6. The message “O.L” indicates that the voltage being measured exceeds the maximum
value measurable by the instrument
7. When symbol “-” appears on the instrument’s display, it means that voltage has the
opposite direction with respect to the connection in Fig. 2
8. For Maximum and Minimum value measurement and HOLD function measurement,
please refer to § 4.2