
Chapter II
MX 650 / MX 655
25
4.6. Continuity test with buzzer
600V
V
V
1000
750
HOLD
REL
600
PEAK
A
40
400
1mS
1000
V
CAT
V
I
I
I
1000 A
Hz
CAT
V
600
II
I
600V
V
V
1000
750
HOLD
REL
600
PEAK
A
40
400
1mS
1000
V
CAT
V
I
I
I
1000 A
Hz
CAT
V
600
II
I
Set the switch to
.
Connect the red test lead to the "+" terminal and the black to
the "COM" terminal.
Put the touch prods into contact with the circuit to be tested.
If the resistance is less than R < 75
Ω
± 25
Ω
, the buzzer will
make a continuous sound.
Note : Always ensure that the circuit is disconnected from the
power supply before measuring continuity! To offset lead
resistance, short circuit the lead touch prods, then press on the
∆∆∆∆
REL button.
4.7. Diode test
600
PEAK
1m S
V
V
600V
750
1000
HOLD
I
I I
V CAT
A
1000
Hz
V
400
A
1000
40
RE L
CAT
V
600
I I
I
Set the switch to
.
Connect the red test lead to
the "+" terminal and the
black test lead to the "COM"
terminal.
Put the red touch prod into
contact with the diode anode
and the black prod into
contact with the cathode.
Read the value of its
threshold voltage off the
display.
Note: Always ensure that
the circuit is disconnected
from
the
power
supply
before testing diodes! If the
connection is made back to
front, the display indicates
"OL"
(Overload);
this
enables
the
user
to
distinguish the anode from
the cathode.
Содержание MX 650
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