HT instruments HT39 - Manual (Page 15)

HT37 - HT39
EN - 14
4.3.5. Frequency measurement
CAUTION
Maximum input for AC voltage is 750V rms. Do not attempt to take any
voltage measurement exceeding such limit to avoid the risk of electrical
shock and damages to the instrument.
Fig. 7: Frequency measurement
1. Turn the selector on Hz.
2. Insert the test leads into the jacks, the red plug into
HzV
ΩµA jack and the black plug
into COM jack (Fig. 7).
3. Connect the red and black test leads to the positive and negative poles of the circuit
under test respectively. The voltage value will be displayed with automatic detection of
the range.
4. Press RANGE key to activate the manual mode; the “AUTO” symbol disappears from
display. Press cyclically RANGE to change the position of the decimal point on the
display. To activate the Autorange function keep pressed RANGE for at least 1 second.
5. The message "OL" means that the frequency exceeds the measuring limits. In this
case disconnect the test leads from the circuit under test to avoid damaging the
instrument or endanger your own safety.
6. For minimum and maximum value measurement, HOLD and Relative
∆REL functions
please refer to paragraph 4.2.