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Exceeding the specified limits of this meter is dangerous and can expose the user to serious or possibly fatal injury.
Never connect test leads across a voltage source when set to microamps position.
Keep hands and fingers behind hand guards when measuring current on exposed conductors.
The instrument automatically shuts off after 30 minutes of inactivity to conserve battery.
Explains how the meter automatically selects the range or how to select it manually.
Enables the meter to store the highest and lowest readings obtained during measurements.
Displays the hour and minute a high/low value was recorded within a 24-hour period.
Freezes the currently displayed reading on the LCD; symbol 'D.H' appears when active.
Used to power the meter on/off and select measurement functions.
Procedure for measuring AC current using the clamp by placing conductor in jaws.
Do not exceed 600V DC or AC (RMS). Unknown voltage measurements are dangerous.
Exceeding AC (RMS) rating is dangerous; measure line-to-line voltage carefully.
Turn off power and discharge capacitors before resistance measurements to prevent damage.
Do not connect test leads to a voltage source when diode test function is selected.
Capacitors must be discharged prior to testing to avoid damage or injury.
Do not measure current sources with open circuit voltages greater than 250V DC or AC.
Turn off power and disconnect test leads before removing or installing batteries.
Disconnect power source before removing fuse to avoid shock or injury.
Exceeding the specified limits of this meter is dangerous and can expose the user to serious or possibly fatal injury.
Never connect test leads across a voltage source when set to microamps position.
Keep hands and fingers behind hand guards when measuring current on exposed conductors.
The instrument automatically shuts off after 30 minutes of inactivity to conserve battery.
Explains how the meter automatically selects the range or how to select it manually.
Enables the meter to store the highest and lowest readings obtained during measurements.
Displays the hour and minute a high/low value was recorded within a 24-hour period.
Freezes the currently displayed reading on the LCD; symbol 'D.H' appears when active.
Used to power the meter on/off and select measurement functions.
Procedure for measuring AC current using the clamp by placing conductor in jaws.
Do not exceed 600V DC or AC (RMS). Unknown voltage measurements are dangerous.
Exceeding AC (RMS) rating is dangerous; measure line-to-line voltage carefully.
Turn off power and discharge capacitors before resistance measurements to prevent damage.
Do not connect test leads to a voltage source when diode test function is selected.
Capacitors must be discharged prior to testing to avoid damage or injury.
Do not measure current sources with open circuit voltages greater than 250V DC or AC.
Turn off power and disconnect test leads before removing or installing batteries.
Disconnect power source before removing fuse to avoid shock or injury.
The UEi DL250 is a Digital Clamp-On Multimeter designed as an all-in-one test tool for HVAC/R service and industrial maintenance, as well as general electrical troubleshooting. Its compact size, teardrop jaw design, and ergonomic controls aim to provide speed, comfort, and flexibility for various measurement tasks.
The DL250 measures inductive AC current using its clamp, with a capacity of up to 400 Amps AC. For voltage measurements, it handles up to 600 Volts AC and DC. Resistance can be measured up to 40 Megohms, and it includes a continuity function. Capacitance measurements range up to 10,000 microfarads. Temperature can be measured from -40°F to 750°F (-40°C to 400°C) using a K-type thermocouple. For flame safeguard circuits and other low current DC measurements, it offers DC microamps with a resolution of 0.01 µA up to 400 µA. The device also includes a diode check function.
The meter features auto-ranging with a manual ranging capability, allowing the user to select the most appropriate range for measurements or let the meter do it automatically. The "AT" symbol on the display indicates when auto-ranging is active, while "R.H" appears for manual ranging.
A key feature is the MIN/MAX recording function, which stores the highest and lowest readings obtained in AC Amps, AC/DC Volts, Ohms, Temperature, and DC microamps modes. When a new high or low value is recorded, an audible beep sounds. Users can cycle through recorded high, low, and current values. To exit record mode, the "MIN/MAX" button must be pressed and held for two seconds.
The time stamp feature allows for unattended monitoring by recording the hour and minute that high and low values were recorded within a 24-hour period. This is particularly useful for analyzing peak power demands or temperature fluctuations over time. To activate, the "TIME STAMP" button is pressed after initiating MIN/MAX recording. The elapsed time, in hours and minutes, is displayed relative to when the time stamp was engaged.
The "HOLD" button freezes the displayed reading on the LCD, indicated by the "D.H" symbol. Pressing it again or selecting another function cancels data hold.
The rotary function switch is used to power the meter on/off and select various measurement modes, including AC current, capacitance, AC/DC volts, resistance/continuity, Hz/Duty Cycle, temperature, and DC microamps. The "MODE" push-button toggles between color-coded optional functions, such as AC to DC volts, ohms to continuity, and degrees Centigrade to Fahrenheit.
For inductive AC current measurements, the clamp jaws open to 1.25" (32 mm). Conductor alignment marks aid in centering the conductor for maximum accuracy. A hand guard is integrated for operator safety.
When measuring DC current and microamp measurements, the meter must be connected in series with the circuit under test. For resistance measurements, power must be turned off and capacitors discharged from the circuit to prevent damage and ensure accuracy. The continuity mode provides an audible tone for resistances of approximately 500 ohms or less. The diode test function helps check diodes, transistors, and other semiconductor devices for opens, shorts, or normal operation.
The meter includes an auto power-off function that activates after 30 minutes of inactivity to conserve battery life. This function can be disabled by holding the "MIN/MAX" or "RANGE" button while turning the meter on.
The DL250 is designed for long and reliable service. It is recommended to calibrate the meter annually to ensure it meets original performance specifications. Keeping the meter dry and away from dust and dirt helps prevent premature wear. While built to withstand daily use, reasonable caution is advised during storage and handling to avoid damage from severe impacts.
For battery replacement, the meter uses a 9V battery (NEDA 1604 or IEC 6LR 61). The battery compartment is located on the back of the meter, secured by a screw. Users are advised to always use a fresh battery and dispose of old ones properly. If the meter will not be used for an extended period (a month or more), removing the battery is recommended to prevent damage from leakage.
The DC µA position is fuse-protected by a 400 mA fuse (500 milliamp, 250 V, f500mA). If this fuse blows, the meter will display all zeros when the DC µA function is selected. To replace the fuse, the meter must be turned off, test leads disconnected, and the battery/fuse compartment cover opened. The fuse is visible above the battery. After replacing the fuse, the compartment cover must be reattached.
The meter's case should be periodically cleaned with a damp cloth, avoiding abrasives, cleaning solvents, or strong detergents that could damage the finish or structural components.
The DL250 is UL listed CAT III and CE compliant, indicating adherence to safety standards. It comes with a three-year limited warranty covering defects in materials and workmanship under normal use.
General| Type | Clamp Meter |
|---|---|
| Display | LCD |
| Diode Test | Yes |
| Safety Rating | CAT III 600V |
| AC Voltage | 600V |
| DC Voltage | 600V |
| Operating Temperature | 32°F to 104°F (0°C to 40°C) |
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