Bosch MMD 540H Instruction Manual page 9

14 | MMD 540H Hybrid Multimeter | Meter Functions
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.
Select the Resistance
f
"Ω" range with the rotary
switch.
Select the Resistance "Ω"
f
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.
Robert Bosch LLC MMD 540H Instruction Manual | Version 1 | December 2010
Black– Red+
MMD 540H Hybrid Multimeter | Meter Functions | 15
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.
Reverse Probes
Diode - to + + to -
.4 to .9V OL
Good
OL .4 to .9V
OL 1.0 to 3.0V
1.0 to 3.0V OL
Bad .4 to .9V .4 to .9V
OL OL
.000V .000V
MMD 540H Instruction Manual | Version 1 | December 2010
)
Black– Red+
Robert Bosch LLC