HT instruments HT21 - Manual (Page 9)

HT21
EN - 8
4.3.2. AC Voltage measurement
CAUTION
The maximum input for AC voltage is 600V. Do not attempt to measure
higher voltages to avoid electrical shocks or damages to the instrument.
Fig. 3: Using the instrument for AC voltage measurement
1. Switch on Hz% . “AC” symbol is displayed
2. Insert the test leads into the jacks, the red plug into V
Hz%
CAP jack and black
plug into COM jack (see Fig. 3)
3. Connect the test leads to the circuit under test; the voltage value is displayed
4. If the message "
O.L " is displayed the higher range is reached
5. Pressing the Hz% key until the symbols “Hz” or “%” are shown at display to meaning
the readings of frequency or duty cycle associated to voltage AC value
6. For HOLD function and Relative measurement please refer to § 4.2