Meter, Scope and Automotive Circuit Tests in One Handheld
The DM303 combines a True RMS auto-ranging multimeter and oscilloscope with dedicated cranking, ignition, injector, relay, signal-output and K/CAN line modes for car, truck, bus and EV circuit work. Batteries are not included.
- DMM + oscilloscoop
- 12 testfuncties
- 5 A aanstuurstroom
- 6 typen testkabels
- Kleurenscherm van 2.8-inch
Key Features
-
True RMS-meter met automatisch bereik
DC/AC voltage, current, resistance, diode and frequency, with auto range to cut manual range selection.
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Start- en ontstekingscontroles
Records minimum battery voltage during starting and views ignition pulse signals.
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Injector- en relaistests
Drives supported electromagnetic injectors, including supported GDI injectors, and reads real-time injector signals; also tests relays.
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Signal Output
5 V square, 5 Vpp sine and 12 V square outputs for signal simulation on a documented, permitted load.
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K/CAN- en K/LIN-lijngegevens
Views bus line data for circuit-level diagnosis.
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Kit in een gereedschapskist
Rear stand for upright viewing, built-in flashlight, and a toolbox that holds the meter and leads together.
Meer specificaties
| Aanstuursignaal voor injectoren | 500–6000 rpm |
|---|---|
| Data hold | Data lock and clear |
| Interfacetalen | Including English, French, Portuguese, Polish, Spanish, Japanese, Russian, Italian, German, Dutch, Korean and Chinese |
| Optionele lithiumbatterij | 503450 3.7 V 1000 mAh style shown in the reference image; confirm connector and size before fitting |
DM303 vs DM301
| DM303 | DM301 | |
|---|---|---|
| Functions | 12 | 6 |
| Typen testkabels | 6 | 2 |
| Aanstuurstroom van het circuit | 5 A uitgang / 5 A ingang | No |
| Aanstuursignaal voor injectoren | 500–6000 rpm | No |
| Toegevoegde testmodi | Injector, relay, circuit, cranking, signal simulation, CAN and K/LIN line data | Voltage, current, resistance, frequency, oscilloscope, ignition pulse only |
Inhoud van de doos
- DM303-diagnosemultimeter voor auto's
- Draagbare gereedschapskist
- Multifunctioneel meetsnoer
- Accuklemkabel
- Multimetersondes
- Verbindings- en adapterkabels
- Aanvullende meetsnoeren
- User manual
How to Use
- Bepaal de metingUse the wiring diagram to identify the expected signal, reference point and safe mode.
- Inspecteer meetsnoeren en nominale waardenConfirm the terminal, fuse, lead and probe ratings for the task.
- Selecteer de modusChoose the function and start on a safe range.
- Controleer of actieve aansturing is toegestaanBefore injector, relay or signal output, confirm component type, pinout, supply, current and permitted mode.
- Meet het circuitConnect to the correct reference and test point without bridging terminals.
- Noteer en controleerNote the value, compare it with the vehicle specification and recheck before naming a root cause.
Modi, bereiken en veiligheid: DM303-gebruikershandleiding (PDF).
Good to Know
Let op
- Batteries are not included. Use 4 × 1.5 V dry batteries or a compatible lithium battery, purchased separately.
- Never charge dry batteries in the device; only a compatible rechargeable lithium battery may be charged.
- Keep injector drive and signal outputs off ECU outputs, SRS circuits, powered data lines and unknown modules.
- 120 V-injectoren worden niet ondersteund.
FAQ
What does the cranking test result mean?
The DM303 records minimum battery voltage during starting and uses 9.6 V as a general reference. A lower reading can point to a weak or aging battery or a starting-system issue; apply the battery or vehicle maker’s procedure.
Can it replace a full vehicle diagnostic scanner?
No. K/CAN line data helps with circuit-level diagnosis, but it is not a full vehicle scan.
Does a drive response prove an injector is good?
No. It does not by itself prove spray pattern, flow or root cause.
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