HT instruments HT39 - Manual (Page 18)

HT37 - HT39
EN - 17
4.3.8. Capacitance measurement
CAUTION
Before taking any in circuit or capacitance measurement, remove power
from the circuit being tested and discharge all capacitors. Use the short test
lead pair for measurement in order to reduce the stray capacitance. Before
connecting the test capacitor, note the display, which may show a reading
other than zero whenever the range is changed. Subtract this offset reading
from the test result of a capacitor to obtain the true value. Connect the test
capacitor to the input clamps noting the polarity connections when required.
Fig. 10: Capacitance measurement
1. Turn the selector on
.
2. Insert the test leads into the jacks, the red plug into HzV
ΩµA jack and the black plug
into COM jack (Fig. 10).
3. Connect the test leads to the capacitor terminals taking care of the shown polarity. The
capacitance 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 capacitance 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.