Urrea UD18, User Manual And Warranty

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E N G L I S H

2. Set the rotary switch to the continuity 

/ diode function. The Meter selects the 
continuity ( )diode (

) test function.

3. To test continuity, touch the probes 

to the test points. The beeper sounds 
continuously if continuity exists 
(resistance <100Ω). To toggle the beeper 
on or off in continuity/diode test, press 

.   is displayed when the beeper is 

enabled.

4. To test diodes, touch the probes to 

the diode. A forwardvoltage drop of 
about 0.6V (typical for a silicon diode) 
is displayed if the diode is good. Reverse 
the probes. If the diode is good, OFL is 
displayed. If the diode is shorted, the 
beeper sounds continuously in at least 
one direction.If the diode is open, OFL is 
displayed in both directions.

6.4 Measuring Frequency
1. Insert the test leads in the jacks.
2. Set the rotary switch to the frequency 

function (Hz).

3. Touch the probes to the test points, 

and read the display. If the measured 
frequency is greater than 200 KHz. OFL 
(overload) is displayed.

6.5 Measuring Capacitance

CAUTION: DISCHARGE ALL 

CAPACITORS BEFORE ATTEMPTING TO 
MAKE MEASUREMENTS. FAILURE TO 
DO SO CAN RESLUT IN DAMAGES TO 
THE METER.

1. Insert the test leads in the jacks.
2. Set the rotary switch to the capacitance 

function ( ).

3. Touch the probes to the capacitor, and read 

the display. When measuring polarized 
capacitors, be sure to connect the positive 
to the   terminal and the negative to 

the COM terminal. Capacitor dielectric 
absorption can cause measurement errors. 
If more discharge is necessary, the Meter 
displays (

) while the capacitor is 

discharging.

4. To exit capacitance, change the 

measurement function.

NOTE: Use manual range mode to 
get faster response of reading when 
measuring capacitance in the ranges of 
1000μF or 10000μF.

7. LOGIC PROBE FUNCTION

This Function is ideal for analyzing digital logic 
levels and serial communications.
This Meter measures logic levels at frequencies 
up to 400 KHz and detects pulses as narrow as 
2.5μS for those high speed logic circuits. When 
this function is working, the displayed shows if 
the test points at a logic level high or low or is 
pulsing or is not active.
1. Set the rotary switch to the logic probe 
function (LP).
2. Connect the test leads to the test point.
3. If the high output is active for more 
than one second, this Meter automatically 
measures the voltage and displays it in two 
right most digits along with a   .
If the high output is more than 39.9 V DC, this 
Meter displays a      .

If the low output is active and the right output 
has been inactive for more than one second 
this Meter automatically measures the voltage 
and displays it in the two right most digits 
along with a   , when a negative sign may be 
needed in the 2nd digit. If the low output is