HT 1009740, User Manual

Page: 25 / 100

HT7
EN - 6
5. OPERATING INSTRUCTIONS
5.1. DC VOLTAGE MEASUREMENT
CAUTION

The maximum input for DC voltage is 690V. Do not measure higher
voltages to avoid risks of electrical shocks or serious damages to the
instrument.

symbol is lighted up whenever the voltage between the probes
exceeds 50V, even if the batteries are low or have been removed.
Fig. 2: DC Voltage measurement
1. Perform the preliminary Autotest (see § 4.3)
2. Connect the L1 and L2 probes to the object under test (see Fig. 2). The measurement
is performed only when probes are in contact to live conductors .
3. The instrument turns automatically on and the measured DC voltage value is displayed
both in numerical and bargraph modes. DC symbol is displayed. Always keep the
instrument in vertical position for an optimal display reading.
4. The symbol " - ", if displayed, indicates that the measured voltage is negative.
5. The instrument turns automatically off as soon as the probes are disconnected from the
object under test. If the measured voltage is lower than 4.5V DC the instrument turns
automatically off.
6. Press the key to switch on the white LED illuminator to perform measurements in
dark environments.