AUT20 - Measurement Extech - Free user manual and instructions
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| Product Type | Digital Multimeter |
| Brand | Extech |
| Model | AUT20 |
| AC Voltage Range | 0 to 600V |
| DC Voltage Range | 0 to 600V |
| AC Current Range | 0 to 10A |
| DC Current Range | 0 to 10A |
| Resistance Range | 0 to 20MΩ |
| Display | LCD, 2000 counts |
| Dimensions | 150 x 70 x 30 mm |
| Weight | 250 g (including battery) |
| Power Supply | 9V battery (NEDA 1604, 6F22) |
| Functions | AC/DC voltage, AC/DC current, resistance, continuity test, diode test |
| Safety Rating | CAT II 600V |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Storage Temperature | -10°C to 50°C (14°F to 122°F) |
| Humidity | 0% to 80% RH (non-condensing) |
| Accessories Included | Test leads, 9V battery, user manual, carrying case |
| Maintenance | Clean with dry cloth; replace battery when low battery indicator appears |
| Safety Instructions | Do not measure voltages exceeding 600V; use proper range; replace fuses only with specified type |
| Reparability | Contact Extech service center for repairs; no user-serviceable parts inside |
Frequently Asked Questions - AUT20 Extech
What is the maximum voltage this multimeter can measure?
The Extech AUT20 can measure up to 600V AC/DC safely with its CAT II rating.
How do I replace the battery?
Remove the back cover using a screwdriver, replace the 9V battery with a new one, and reattach the cover. Ensure the multimeter is turned off.
Can I measure current above 10A?
No, the maximum current is 10A AC/DC. Exceeding this may blow the internal fuse or damage the meter.
How to test continuity?
Turn the dial to the continuity/ohm position. Touch probes together; a beep indicates continuity. Then test your circuit.
What does the diode test function do?
The diode test checks forward voltage drop. Connect red to anode, black to cathode; a reading around 0.5-0.8V indicates a good silicon diode.
How do I clean the multimeter?
Use a dry, soft cloth to clean the exterior. Do not use solvents or water to avoid damage.
What does 'OL' mean on the display?
'OL' stands for Over Limit, meaning the reading exceeds the selected range. Switch to a higher range if safe.
Is the multimeter autoranging?
Yes, the AUT20 is an autoranging multimeter, automatically selecting the appropriate range for most measurements.
Can I measure temperature with this model?
No, the AUT20 does not have a temperature function. It measures voltage, current, resistance, continuity, and diodes only.
What safety precautions should I take?
Always use the correct input jacks and range. Do not measure voltages above 600V. Inspect test leads for damage before use.
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