Equus 3340 - Automotive DMM (10 MegOhm / UL) - Manual (Page 13)

D. CONTINUITY TEST
1. Plug the RED test lead into the jack of the tester; plug
the BLACK test lead into the "COM" jack.
2. Set the tester’s Function/Range Selector Switch to the
position (see Controls and Indicators, Item 3).
3. Press the SEL button, as necessary, until the icon is
shown on the display.
4. Place the RED Test Lead to one end of the wire or device
being tested for continuity and the BLACK Test Lead to the
opposite end.
5. Listen to the sound of the beeper and confirm the results by
reading the display.
NOTE: The beeper will sound only if the continuity of the item
under test (resistance between the two test leads) measures
less than 120 ohms.
E. FREQUENCY MEASUREMENT
Frequency is the number of times that an event repeats itself
during a one-second time period. Frequency is measured in
Hertz (Hz).
1. Plug the RED test lead into the “Hz” jack of the tester; plug
the BLACK test lead into the "COM" jack.
2. Set the tester’s Function/Range Selector Switch to the Hz
position (see Controls and Indicators, Item 4).
3. Place the RED test lead onto the signal output wire of the
sensor or circuit under test and the BLACK test lead onto a
good chassis ground (consult the wiring diagram in the vehi-
cle’s Service Manual for proper connections).
4. Read the results on the display.
F. PULSE WIDTH MEASUREMENT
Pulse Width is the length of time that a solenoid or actuator is
energized (“ON” time) during a one-cycle time period. Pulse
Width is measured in milliseconds (ms).
1. Plug the RED test lead into the “ms” jack of the tester; plug
the BLACK test lead into the "COM" jack.
12
E
WARNING
To avoid electric shock, shut off the power to the test arti-
cle before testing it for continuity.