Resistance Measurements - Urrea UD88 Manual De Usuario Y Garantía

To measure voltage:
- Select the Voltage ( V or
switch.
- Press the DC/AC button to select AC or DC.
Insert:
- Black lead in COM jack.
- Red lead inor VΩRPM CAP jack.
Touch the Black probe to the negative (-) circuit or to
Ground.
Touch the Red probe to the circuit coming from the
power source.
• Accuracy
A measurement range determines the highest value
the Meter can measure. Most Meter functions have
more than one range.
Being in the right measurement range is very
important when measuring.
Selection of a lower range will move the decimal point
one place and increase the accuracy of the reading.
An (overflow) display means the range is too
low; select the next higher range.
• Analog Bar Graph
The bar graph is easier to read when the date causes
the digital display to rapidly change. It is also useful
for trend setting or directional data.
) range with the rotary
• Safety Shutter
When measuring voltage, be sure the Red test lead is
in the input jack marked "V". If the test lead is in an
A or mA μA jack, you may be injured or damage the
Meter.
Safety Shutter of the Meter frees you from inadvertent
connection to the current terminals.

Resistance Measurements

Resistance is measured in Ohms (Ω) and the values can
greatly vary from a few MilliOhms (mΩ) for contact
resistance to billions of Ohms for insulators. The Meter
can measure down to about 0.1 Ohms and measure as
high as 40MΩ.
WARNING: TURN OFF POWER AND DISCHARGE
ALL CAPACITORS ON CIRCUIT TO BE TESTED BEFORE
ATTEMPTING IN-CIRCUIT RESISTANCE MEASUREMENTS.
ACCURATE MEASUREMENT IS NOT POSSIBLE IF EXTERNAL
OR RESIDUAL VOLTAGE IS PRESENT.
NOTE: The resistance in the test leads can affect accuracy
in the 400Ω range. Short the leads together and press the
REL button to automatically subtract the test lead resistance
from the resistance measurements.
To measure resistance:
- Select the Resistance (Ω) setting with the rotary
switch.
- If a more accurate measurement is desired, select the
E N G L I S H
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