25
Making Measurements
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Many diodes have a stripe or mark on one side. The
marked side of the diode indicates the diode’s
cathode or negative (–) side. The other side is the
anode or positive (+) side.
If a diode is not marked, you can use your meter to
check the diode’s polarity. As you follow the steps
under “Checking Diodes” on Page 24, connect the
red test lead to one side, connect the black test lead
to the other side, then measure and note the
voltage. Then reverse the test leads and measure
and note the second reading. The side of the diode
where the meter shows a higher voltage using the
red test lead is the anode (+) side. The side of the
diode where the meter shows
Eý<ý
Eý<ýEý<ý
Eý<ýusing the red test
lead is the cathode (–) side.
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1. Rotate the function selector to LOGIC/Hz. .
..
.
2. To select the logic function, press SELECT
once.
BE
BEBE
BE appears.
3. Connect the test leads to the device you want
to check.
BE
BEBE
BE appears if the logic is low (the
voltage is lower than 1.0V).
>_
>_>_
>_ appears if the
logic is high (the voltage is higher than 2.0V)
The actual voltage appears if the logic is
between 1 and 2 V.
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The meter can measure frequency from 10 Hz to 4
MHz and duty cycle and pulse width with a signal
frequency from 10 Hz to 100 kHz. The amplitude of
a signal is not larger than 10V peak.
1. Rotate the function selector to
LOGIC/Hz.
2. To select the frequency function, press
SELECT
until
Hz
,
KHz
, or
MHz
appears.
.
"%#76+10"
.
Measuring Logic
Do not apply more than 5
VDC between terminals.
This could damage the
meter or the circuit being
tested.
22-812.fm Page 25 Monday, April 8, 2002 1:32 PM
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