ACD-21SW - Multimeter Amprobe - Free user manual and instructions
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| Product type | Digital clamp meter |
| Brand | Amprobe |
| Model | ACD-21SW |
| Dimensions (L x W x H) | 230 mm x 80 mm x 45 mm |
| Weight | 360 g (with batteries) |
| Power supply | 2 AAA 1.5 V batteries |
| Main functions | AC/DC voltage measurement, AC current (clamp), resistance, capacitance, frequency, temperature, continuity and diode test, true RMS |
| AC voltage range | 0 to 600 V |
| AC current range | 0 to 400 A |
| Maximum resolution | 0.1 mV / 0.1 mA / 0.1 Ω |
| Display | Backlit LCD display, 4000 counts |
| Overload protection | 600 V CAT III / 300 V CAT IV |
| Maintenance and cleaning | Clean with a soft, dry cloth. Do not use solvents. Remove batteries if not used for extended periods. |
| Safety | Double insulation, compliant with IEC 61010-1, built-in protection fuse |
| Spare parts and repairability | Replacement fuse (type F 500 mA / 600 V), test lead set, batteries. Repair by authorized center only. |
| Operating temperature | 0 °C to 40 °C |
| Operating humidity | Max 80% RH (non-condensing) |
| Included accessories | Test leads, type K thermocouple, batteries, carrying case |
Frequently Asked Questions - ACD-21SW Amprobe
How to measure alternating voltage with the Amprobe ACD-21SW?
Turn the rotary switch to the V~ position. Connect the test leads: black to COM and red to V. Place the test probes in parallel across the source. Read the value on the LCD display. Make sure to respect the safety category (CAT III/IV).
What is the measurement accuracy of the clamp current?
The accuracy of AC current (clamp) is ±1.5% of reading + 5 digits for the 0-400 A range. For best results, center the conductor in the clamp and avoid external magnetic fields.
How to change the batteries of the device?
Turn off the device. Unscrew the battery compartment cover on the back. Replace the 2 used AAA batteries with new ones, respecting polarity. Screw the cover back on. Do not mix old and new batteries.
What to do if the display shows 'OL'?
The 'OL' (Overload) display means the measurement exceeds the selected range. Change to a higher range or use a different function. Check that the leads are properly connected and that the source does not exceed 600 V.
How to test continuity of a circuit?
Set the rotary switch to the continuity test position (diode + wave symbol). Connect the leads to COM and V. Touch the test probes to the two ends of the circuit. A continuous beep indicates a resistance lower than approximately 50 Ω.
Can I measure direct voltage with this multimeter?
Yes, turn the rotary switch to V⎓. Connect the red lead to V, black to COM. Place the probes in parallel across the DC source. Polarity is shown on the display: a minus sign before the value indicates reversed probes.
How to use the temperature measurement function?
Select the temperature function (°C or °F) with the rotary switch. Connect the included type K thermocouple to the COM and TEMP inputs. Place the probe on the object to measure. The display shows the temperature. Be careful not to exceed 400 °C.
What is the safety category of the ACD-21SW?
The device is rated CAT III 600 V / CAT IV 300 V. This allows safe measurement on fixed power distribution circuits (CAT III) and on outdoor or level IV installations (CAT IV) up to 300 V.
How to clean the multimeter?
Turn off the device and remove the batteries. Use a soft cloth slightly dampened (water) to wipe the housing. Never use chemicals, alcohol or solvents. Dry completely before reuse.
What to do if the fuse is blown?
Disconnect the leads and turn off the device. Open the battery compartment and locate the fuse (type F 500 mA / 600 V). Replace it with an identical fuse. Never use a different value fuse; this could damage the device or compromise safety.
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USER MANUAL ACD-21SW Amprobe
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Product information
Brand : Amprobe
Model : ACD-21SW
Category : Multimeter