AUTOJACK DM600 Digital Multimeter
User's Manual
General
The AUTOJACK DM600 is a high-performance, high-reliability, full-featured, large-screen display handheld 3-1/2-digit multimeter. It features an integrated circuit and A/D converter core, and is equipped with an overload protection circuit. It can be used to measure DC and AC voltage, DC current, resistance, diodes, battery voltage, non-contact AC voltage sensing, and circuit continuity. It is an ideal tool for laboratories, factories, and electronic DIY enthusiasts.
Schematic of Meter Appearance
The multimeter features the following key components:
- ① NCV and continuity indicator: The NCV field indicates the intensity of the induced voltage. The green LED in the Continuity field lights up to indicate ON status.
- ② Display: 3-1/2-digit large-screen display with clear readings.
- ③ Backlight/data hold button: Press to enter data hold function. Hold for ~2 seconds to turn on the backlight (auto-off after ~1 minute, manually off by holding for 2 seconds). To cancel auto-shutdown, hold this button while turning the rotary switch to the OFF position.
- ④ Flashlight button: Press to turn on the flashlight; it turns off automatically after ~3 minutes. Press again to turn it off manually.
- ⑤ Function range selection knob: Turn to select the relevant function and measurement range.
- ⑥ V//Ma/µA/Diode/Battery Jack: Positive input for measuring voltage, resistance, diode, current less than 200mA, etc. (Connect the red probe here).
- ⑦ COM jack: The common input terminal for all measurements (Connect the black probe here).
- ⑧ 10A jack: Positive input terminal for measuring current up to 10A (Connect the red probe here).
Safety Information
Safety Signs
- ▲ (Warning): Refer to the Manual for important safety information.
- High voltage hazard.
- Not recyclable.
- Double insulation (Class II safety equipment).
- The fuse must be replaced with a new one as specified in the Manual.
Cautions for Use
- The meter can only be used with the probes provided to meet safety standards. If probes are damaged, replace them with identical or equivalent specification probes.
- Do not exceed the input limit specified for each range.
- When measuring, do not touch unused input terminals.
- If the measurement range is unknown, set the function range switch to the maximum range and gradually decrease it.
- Before switching the function range switch, disconnect the probes from the circuit and turn off power. Discharge all capacitors.
- When measuring voltages above 60V DC or 30V AC, keep fingers within the safe area of the probe.
- When measuring TV sets or switching power supplies, be aware of high voltage pulses that may damage the meter. Measure with care.
Technical Indicators
General Features
- Display: 3-1/2 digit, maximum display 1999.
- Overrange Indication: "OL"
- Polarity Display: "-" for negative polarity.
- Automatic Shutdown: Approximately 10 minutes.
- NCV: Non-contact AC voltage detection.
- Power Supply: 2 x 1.5V AAA batteries.
- Operating Temperature: 0°C to 40°C.
- Storage Temperature: -10°C to 50°C.
- Dimensions: 150mm x 70mm x 50mm.
- Weight: 195g.
- Overload Protection: PTC 600V DC or AC RMS for most functions; Fuses: F 200mA/250V (fast-acting) and F10A/250V (fast-acting) for current inputs.
- Maximum Voltage to Earth: CATIII 600V.
- Frequency Range (AC Voltage): 40Hz to 400Hz (Display is average, sine wave RMS).
Technical Specifications
DC Voltage
| Range | Resolution | Accuracy |
|---|---|---|
| 200mV | 100µV | ±0.5% of reading + 2 digits |
| 2V | 1mV | ±0.5% of reading + 2 digits |
| 20V | 10mV | ±0.5% of reading + 2 digits |
| 200V | 100mV | ±0.5% of reading + 2 digits |
| 600V | 1V | ±0.8% of reading + 2 digits |
Overload Protection: PTC 600V DC or AC RMS.
AC Voltage
| Range | Resolution | Accuracy |
|---|---|---|
| 200V | 100mV | ±1.2% of reading + 10 digits |
| 600V | 1V | ±1.2% of reading + 10 digits |
Overload Protection: PTC 600V DC or AC RMS. Frequency Range: 40Hz to 400Hz. Display: Average (sine wave RMS).
DC Current
| Range | Resolution | Accuracy |
|---|---|---|
| 2000µA | 1µA | ±1% of reading + 2 digits |
| 200mA | 100µA | ±1.5% of reading + 2 digits |
| 10A | 10mA | ±3% of reading + 2 digits |
Overload Protection: F 200mA/250V Fuse (for 200mA range), F 10A/250V Fuse (for 10A range).
Resistance
| Range | Resolution | Accuracy |
|---|---|---|
| 200 Ω | 0.1Ω | ±0.8% of reading + 3 digits |
| 2kΩ | 1Ω | ±0.8% of reading + 2 digits |
| 20kΩ | 10Ω | ±0.8% of reading + 2 digits |
| 200k Ω | 100Ω | ±0.8% of reading + 2 digits |
| 20MΩ | 10kΩ | ±1.2% of reading + 3 digits |
Maximum open circuit voltage: 2.4V.
Diode and Continuity
Description: Continuity test and diode measurement are executed in smart mode. When resistance is < ~30 Ω, it displays resistance and the buzzer sounds with the continuity indicator (green LED) lit. For diodes, it displays approximate forward voltage. "OL" is shown for open circuits or reversed polarity. Normal forward voltage for silicon PN junctions is ~0.5V to 0.8V.
Battery Voltage Measurement
Description: Measures 1.5V and 9V batteries. Load resistance is ~100Ω for 1.5V and ~400Ω for 9V.
Instructions for Use
Cautions Before Operation
- Turn on the power and check the battery level. Replace batteries if "---" is displayed.
- The warning symbol ▲ near probe jacks indicates input limits to protect the internal circuit.
- Set the function range switch to the desired range before measurement.
DC Voltage Measurement
- Connect the red probe to the "VmA" jack and the black probe to the "COM" jack.
- Set the function range switch to a V-range. Connect the probes to the power or load. Polarity and measured value will be displayed.
- Notes: If unknown range, start with maximum and decrease. "OL" indicates overrange; select a higher range. Do not input > 600V. Be cautious with high voltages.
AC Voltage Measurement
- Connect the red probe to the "VmA" jack and the black probe to the "COM" jack.
- Set the function range switch to a V-range. Connect the probes to the power or load. The measured value will be displayed.
- Note: Refer to DC voltage measurement notes for ranges and safety.
DC Current Measurement
- Connect the black probe to the "COM" jack.
- For currents up to 200mA, connect the red probe to the "VmA" jack. For currents between 200mA and 10A, connect the red probe to the "10A" jack.
- Set the function range switch to the desired A range. Connect the probes in series with the load. The displayed current value indicates polarity.
- Notes: If unknown range, start with maximum and decrease. "OL" indicates overrange; select a higher range. Exceeding jack limits will blow the fuse.
Resistance Measurement
- Connect the black probe to the "COM" jack and the red probe to the "VmA" jack.
- Set the function range switch to the desired resistance range. Connect the probes to the resistance under test.
- Notes: "OL" indicates overrange; select a higher range. High resistance readings may take time to stabilize. "OL" is displayed with no input. Turn off power and discharge capacitors before online resistance measurements.
Continuity and Diode Measurement
- Connect the black probe to the "COM" jack and the red probe to the "VmA" jack.
- Set the function range switch to the continuity/diode field. Connect probes to the object.
- If resistance < 30 Ω, continuity mode activates: indicator lights, buzzer sounds, resistance displayed.
- For diodes, diode mode activates: displays forward voltage. "OL" for open/reversed polarity.
- Notes: Turn off power and discharge capacitors before online measurements. "OL" is displayed with no input.
Battery Measurement
- Connect the black probe to the "COM" jack and the red probe to the "VmA" jack.
- Set the function range switch to the battery measurement range.
- Connect the red probe to the battery's "+" terminal and the black probe to the "-" terminal. The battery voltage will be displayed.
- Note: Do not input > DC 60V or AC 30V.
Non-contact AC Voltage Sensing (NCV)
- Set the function range switch to the NCV field.
- Place the probe marked "NCV" on the front of the meter near the object to detect AC voltage or electromagnetic field.
- Low Voltage: Display shows "--L", green LED lights, buzzer alarms continuously.
- High Voltage: Display shows "--H", two red LEDs light up, buzzer alarms continuously at a higher frequency.
Maintenance
Battery and Fuse Replacement
- Disconnect probes and turn off power before replacement. Remove the two screws on the back cover.
- Fuse Specifications: F 200mA/250V (fast-acting) and F10A/250V (fast-acting). Use only fuses of the same specifications.
- Battery Specifications: Two 1.5V AAA batteries. Use batteries of the same specifications.
- Ensure the back cover is tightened before using the meter after replacement.
- Warning: To avoid electric shock, ensure probes are disconnected before opening the back cover. Ensure the back cover is tightened before use.
Accessories
- User Manual: 1 copy
- Probes: 1 set
- Packing box: 1 set
- 1.5V AAA Batteries: 2 pieces
