Black–
Red+
Black–
Red+
Robert Bosch LLC
MMD 540H Instruction Manual | Version 1 | December 2010
MMD 540H Instruction Manual | Version 1 | December 2010
Robert Bosch LLC
Meter Functions – Resistance (Ω)
IMPORTANT: If you are
testing an application that
has capacitors in the circuit,
be sure to turn the power
OFF on the test circuit and
discharge all capacitors.
Accurate measurement is
not possible if external or
residual voltage is present.
f
Select the
Resistance
“
Ω
” range with the rotary
switch.
f
Select the
Resistance
“
Ω
”
function with the Mode
button. Please note, the
unit defaults to resistance.
Insert:
f
Black lead in
COM
terminal.
f
Red lead in
V-Ω-RPM
terminal.
Touch the test lead probes
across the resistor to be tested.
Meter Functions – Diode Check (
)
IMPORTANT: Turn the power OFF to
the test circuit
f
Select the
Diode Check
“
”
function with the rotary switch and
mode button.
Insert:
f
Black lead in
COM
terminal.
f
Red lead in
V-Ω-RPM
terminal.
Touch the Black test probe to the
negative (-) side of the diode.
Touch the Red test probe to the
positive (+) side of the diode. Reverse
the probes: Black to the positive (+)
side and Red to the negative (-) side.
NOTE: A “good” diode will read low
in one `direction and high in the
other direction when the probes are
reversed (or vice versa).
A defective diode will have the same
reading in both directions or read
between 1.0 to 3.0 V. in both directions.
Diode
- to +
Reverse Probes
+ to -
Good
.4 to .9V
OL
OL
.4 to .9V
Bad
OL
1.0 to 3.0V
1.0 to 3.0V
OL
.4 to .9V
.4 to .9V
OL
OL
.000V
.000V
MMD 540H Hybrid Multimeter |
Meter Functions | 15
14
| MMD 540H Hybrid Multimeter |
Meter Functions