Extech Instruments DC400 User Manual page 4

Operation
DC Current Measurements
1. Set the Function switch to the 40A or 400A DC range.
2. With no conductor in the jaws, press the ZERO button to null the meter display.
3. Press the Trigger to open the current sense Jaw.
4. Fully enclose one conductor to be measured. Do not allow a gap between the two halves of
the jaw.
5. Read the DCA value on the display.
Data Hold
To freeze the current reading on the LCD, press the HOLD button. To release the Data Hold
function and return the meter to normal operation, press the HOLD button again.
Maintenance
Battery Replacement
1. When the low battery symbol appears on the LCD the battery must be replaced.
2. Remove the orange rubberized cover.
3. Remove the battery compartment screw.
4. Lift off the battery compartment cover and replace the 9V battery.
5. Replace compartment cover and secure the screw.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection sites,
the retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end‐of‐life
devices to a designated collection point for the disposal of electrical and electronic equipment.
Cleaning
Use only a dry cloth to clean the meter housing; do not use cleaning agents, abrasives, or
solvents.
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DC400‐en‐GB_V2.0 07/15
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