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DL250-MAN P. 7
To measure AC or DC current flow (in amps):
1. Ensure power is off to the circuit to be tested.
2. Insert the test leads into the meter (red to the multifunction port
on the right, and black to the common port on the left).
3. Set the rotary switch to the DC microamps (test leads) position.
4. You may manually select either the 40 or 400 µA range, or leave
it in the autoranging mode.
5. Touch the leads together and press the “HOLD” button on the
side of the meter for a minimum of two seconds to zero the meter.
6. Break the circuit as described earlier and connect the meter leads
to the appropriate points. Some gas furnace models have special
adapters for flame safeguard testing.
7. Apply power to the circuit.
8. Note your measurement value.
9. Disconnect power to the circuit. Do not remove the leads from
the circuit until power is disconnected.
M a i n t e n a n c e
Service
WARNING!
Repair and service of this instrument is to be performed by qualified
personnel only. Improper repair or service could result in physical
degradation of the meter. This could alter the protection from electrical
shock and personal injury this meter provides to the operator. Perform
only those maintenance tasks that you are qualified to do.
These guidelines will help you attain long and reliable service from
your meter:
1. Calibrate your meter annually to ensure it meets original
performance specifications.
2. Keep your meter dry. If it gets wet, wipe it dry immediately.
3. Whenever pra c t i cal, keep the meter away from dust and dirt, which
can cause premature wear and collect on internal components.
4. Although your meter is built to withstand the rigors of daily use, it can
be damaged by severe impacts. Use reasonable caution when using
and storing the meter.
NOTE: When servicing the meter, use only the replacement
parts specified.
Battery: 9V, NEDA 1604 or IEC 6LR 61
Fuse: Fuse 500 milliamp, 250 V, f500mA
Test lead set: ATL55
Measuring Capacitance
This meter measures capacitors, such as those used as motor-run-start
capacitors, ranging in value from .001 to 10,000 microfarads (µf).
WARNING!
Capacitors should be completely discharged prior to testing.
Some electronic devices use capacitors in circuits that are designed to
increase voltage. By design, a capacitor stores energy. If a capacitor has
been charged at greater than 600 volts, your meter may be damaged by
attempting to measure it. Larger capacitors may store enough energy to
cause injury if they are discharged through the body. Use a conductive
device to dissipate the charge on capacitors. Large capacitors should be
“bled” by using a resistive load between terminals to slowly eliminate the
charge. Smaller capacitors may be directly shorted using a metallic object.
To measure ca p a c i t a n c e :
1. Discharge the capacitor to be tested as prescribed above.
2. Isolate the capacitor by lifting at least one of its two legs away
from the circuit.
3. Insert the test leads into the meter (red to the multifunction port
on the right, and black to the common port on the left).
4. Select the capacitance .
5. Connect the red test lead to one side of the capacitor, and the
black to the other.
6. Note the displayed value. In the autoranging mode, it takes
approximately 10 seconds to settle on a value for a capacitor. In
the manual ranging mode, measurements are considerably faster.
Measuring DC Microamps
The DC microamp position has been incorporated in this meter to
permit flame safeguard testing, as well as other low current DC
measurements. DC current of 0.1 microamps (µA) to 400 µA can
be measured.
CAUTION!
The current functions are protected by a 250 volt rated fuse. To avoid
damage to the instrument, do not measure current sources having
open circuit voltages greater than 250 volts DC or AC.
NOTE: When taking current measurements, this meter must be
connected in series with the circuit (or circuit element) under test.
NEVER CONNECT THE TEST LEADS ACROSS A VOLTAGE
SOURCE while the rotary switch is set to the microamps position.
This can cause damage to the circuit under test or this meter.
To measure current, you must break the circuit under test and make
the meter part of the circuit. Two connection points are created when
a circuit is broken. On one side is the power source and the other is
the load.
A minus sign will be displayed if the current is flowing opposite to the
connection polarity.
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