UEi DL250 User Manual
1-800-547-5740 • Fax: (503) 643-6322
www.ueitest.com • email: info@ueitest.com
DL250
INSTRUCTION MANUAL
Introduction
The DL250 Digital Clamp-on is the all-in-one test-tool that's designed
to make quick work of HVAC/R service and industrial maintenance.
Whether you're measuring flame safeguard current, motor inrush
current, run/start capacitors, recording time-stamped temperature
highs and lows, or performing general electrical troubleshooting, the
DL250 has you covered! It's convenient size, teardrop jaw design
and ergonomic controls add speed, comfort and flexibility to your
measurement tasks.
HVAC Trade
• Check current draw in motors and compressors
• Use MIN/MAX recording in the temperature mode to
assess efficiency
• Test run/start capacitors
• Confirm low voltage control signals
• Measure flame safeguard device current draw
• Confirm power sources
• Analyze temperature and power data with the aid of the time stamp
Electrical Trade
• Check for energized circuits
• Balance loads
• Evaluate electrical contacts
• Capture motor in-rush current readings
• Determine peak power demand periods
• Verify line voltage stability
• Monitor motors and other loads for excess hear
• Check motor run/start capacitor values
Features include:
• 400 Amps Ac
• 600 Volts AC and DC
• Resistance to 40 Megohms
• Continuity
• Capacitance to 10,000 microfarods
• Temperature to 750˚F (400˚C)
• .01 µA DC resolution for flame safeguard circuit testing
• Diode check function
• Time-stamped record function
• Auto ranging with manual ranging capability
• MIN/MAX and data hold
• 1 1/3” jaw capacity
• CE and UL listed CAT III
• Three year limited warranty
DL250-MAN P. 1
Safety Notes
Before using this meter, read all safety information carefully. In
this manual the word "WARNING" is used to indicate conditions
or actions that may pose physical hazards to the user. The word
"CAUTION" is used to indicate conditions or actions that may
damage this instrument.
WARNING!
Exceeding the specified limits of this meter is dangerous and can
expose the user to serious or possibly fatal injury.
• DO NOT attempt to measure any voltage that exceeds 600 volts
with this meter - UEi offers numerous alternatives for measuring
high voltage and current
• Voltages above 60 volts DC or 25 volts AC may constitute a
serious shock hazard
• DO NOT attempt to use this meter if either the meter or the test
leads have been damaged. Send unit in for repair by a qualified
repair facility
• Test leads must be fully inserted prior to taking measurements
• Always turn off power to a circuit (or assembly) under test before
cutting, unsoldering or breaking the current path. Even small
amounts of current can be dangerous
• Always disconnect the live test lead before disconnecting the
common test lead from a circuit
• When measuring high voltage, disconnect the power source before
making test lead connections. Connect the test leads to the meter
first then to the circuit under test. Reapply power
• If any of the following indications occur during testing, turn
off the power source to the circuit under test:
• Arcing
• Flame
• Smoke
• Extreme Heat
• Smell of Burning Materials
• Discoloration or Melting of Components
• Read the safety precautions associated with the equipment being
tested and seek assistance or advice when performing
unfamiliar tasks
• Keep your fingers away from the test lead metal probe contacts
and bus-bars when making measurements - Always grip the
instrument and test-leads behind the hand guards (molded into
the probes)
• In the event of electrical shock, ALWAYS bring the victim to
the emergency room for evaluation, regardless of the victim’s
apparent recovery - Electrical shock can cause an unstable heart
rhythm that may need medical attention
DL250-MAN P. 2
4. Range and Time Stamp Push-button: Switches meter
from auto to manual ranging. Also initiates the time stamp
function when used in conjunction with MAX / MIN / R e c o r d i n g .
5. Hold Push-button: Freezes the value displayed on the digital
read-out. This function does not work while recording is in
progress. Also turns on back light and work area light.
6. MAX/MIN Push-button: Use to cycle through recorded and
present values, and the time stamp function.
7. Clamp Lever: Opens and closes current clamp jaw.
8. Mode Push-button: Toggles the color-coded optional functions
indicated on the rotary function switch (AC to DC volts, ohms to
continuity and degrees centigrade to fahrenheit, frequency to
duty cycle).
9. Rotary Function Switch: Used to power the meter on and
off, or to select the available measurement functions:
• Measures inductive AC current using the clamp
• Measures capacitance at the test lead inputs
• Measures volts AC or DC Volts at the test lead inputs
• Measures resistance or continuity at the test lead inputs
• Measures Hz and Duty Cycle
• Measures temperature with the K-type thermocouple
and adapter plug at the test lead inputs
• Measures DC microamps using the test lead inputs
CAUTION!
When taking DC current and micro amp 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.
10. Off Position: Turns the meter off. Always store your meter in
the off position. If the meter will not be used for a month or more,
remove the batteries.
11. Display: Communicates function, range and value information
to the user. (See items 16 through 30)
12. 400 µA MAX FUSED: Indicates that the DC µA ranges
are fuse protected.
13. Common Terminal: The black test lead is plugged into
this terminal to supply the ground or “low” reference for all
measurements.
14. MAX 600V : Indicates the maximum voltage potential that
can be applied at the terminals.
WARNING!
DO NOT Exceed 1000 volts DC or AC-RMS at either the common or
multifunctional input ports, as measured from earth ground.
15. VΩ µA TEMP Terminal: The red lead is
plugged into this terminal. It is used for AC/DC volts, ohms,
continuity, microamps, diode, capacitance and temperature
measurements.
International Symbols
C o n t r ols and Indicators
1. Clamp: Used to measure inductive AC current. Opens
to 1.25" (32 mm).
NOTE: The clamp uses a high tension spring to close the
jaw. Do not allow fingers or objects to become pinched in
the base as jaw closes.
2. Conductor Alignment Marks: Used to aid in the visual
alignment of a conductor when measuring inductive
amperage. Greatest accuracy is achieved when the
conductor inside the clamp is centered at the intersection
of these marks.
3. Hand Guard: Used as a point of reference for the
operators safety.
WARNING!
Always keep your hands and fingers behind the hand guards when
measuring current on exposed conductors. Contact may result in
serious injury.
1
2
3
4
5
6
7
8
12
13
14
15
9
10
11
The following describes the indicators displayed by the LCD.
16. this symbol appears when the battery needs replacement.
NOTE: A low battery will adversely affect accuracy.
17. AC: Indicates that alternating current/voltage is being measured.
18. Minus (—): I n d i cate s the value measured has a negative polarity.
19. DC: Indicates that direct current/voltage is being measured.
20. AT: Indicates the meter is in the autoranging mode.
21. MAX: Indicates the meter is displaying the maximum
value recorded.
22. Indicates the meter is currently recording the maximum and
minimum values.
23. MIN: Indicates the meter is displaying the minimum
value recorded.
24.
•
)
)
)
: Indicates the meter is in the continuity measurement mode.
25. Indicates the meter is in the diode test mode.
26. D.H.: Indicates the value displayed is held on screen
(the data hold button is pressed).
27. R.H.: Indicates the meter is in the manual ranging mode
(the Range button has been pressed).
28. Function and Units of Measurement:
29. OFL: This symbol appears when the input value exceeds
the meters selected range or overall specification.
Operating Instructions
Auto Power Off
The instrument automatically shuts off after 30 minutes of inactivity.
The meter is considered active when there is a change of at least 10
digits during the period (i.e., the meter senses a change from 24.04
volts to 24.14 volts)
To disable this function; press and hold the "MIN/MAX" or the
"RANGE" button while turning the meter on. This function will be
active in all modes, including RECORD and TIME STAMP, unless it
is disabled.
Auto / Manual Range
This instrument is capable of providing either auto (instrument
controlled), or manual (operator controlled) ranging. In the autorange
mode, the meter automatically selects the range that gives you the best
resolution of the value measured. For example, if you were measuring
a 9 volt battery that actually put out 9.6 volts, the meter would
automatically display “9.60”, although it has the ability to display “9” or
“9.6” for the same battery. The far left, or most significant digit, can
only display “0” through “3”, so “9.600” could not be displayed,
instead the symbol “0.FL” would appear on the display indicating the
measured value exceeded the range selected. The meter automatically
enters the autoranging mode when it is first turned on, or if a new
function is selected using the rotary dial. In the autoranging mode, the
symbol “AT” appears on the display.
Although the autoranging mode is easy to use, there are times that you
may prefer the manual ranging mode. For example, suppose you were
measuring a series of connectors you know had either 24 or 120 volts
AC on them. If your goal was to see which terminal had what voltage
applied, the task would go faster and easier if you set the meter to hold
the 400 volt range. To select manual range control, press the “RANGE”
push-button for approximately 1/2 second. As you release the button,
the symbol “R.H” appears at the top of the display, and an audible tone
sounds to alert you that the meter has changed ranges or modes. Each
subsequent time the RANGE button is pressed, the range increases one
step, and a tone sounds until it reaches its highest range. The next press
of the range hold button will return the meter to its lowest range.
Recording MIN/MAX
After selecting the mode and range you will be using, you can enable
the MIN/MAX recording function. This function allows you meter to
store the highest and lowest readings obtained in the following modes:
• AC Amps • Temperature
• AC and DC Volts • DC microamps
• Ohms
You may recall and cycle through the high and low readings or view
the measurement currently being make while you are in the record
mode. Pressing the “MIN/MAX” button locks the meter in the range it
was in at that moment and begins the recording precess. Be sure you
are in a range that can display the minimum and maximum values you
are monitoring (you may prefer to select this range manually). Each
time a new high or low value is recorded, an audible beep sounds.
DL250-MAN P. 3
BAT
R
29
16
17
18
19
20
21 22 23 24 25 26 27
28
Symbol Function or Value
°C Degrees Centigrade
°F Degrees Fahrenheit
µF Micro Farads
mV Millivolts
V Volts
µA Micro Amps (Test Lead
Measurement Ranges)
A Amps (Inductive Clamp Ranges)
M Mega (Value x 1,000,000)
K Kilo (Value x 1,000)
Ω Ohms (Resistance Value)
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