IMPORTANT: RECEIVING INSTRUCTIONS Visually inspect
all components for shipping damage. If you find damage, notify the
carrier at once.
Shipping damage is NOT covered by warranty. The carrier
is responsible for all repair or replacement costs resulting from
damage in shipment.
1
OPERATING INSTRUCTIONS
USB Multimeter
Model GUSB-3450
1. CAUTION
REFER TO THIS MANUAL BEFORE USING THIS TESTER.
2. SPECIFICATIONS:
Operating Range: 3-5.5 VDC, 0-3 ADC
Indicators: Visual Only
USB Type: 3.0-3.1 Type A
Cleaning: Remove grease and grime with clean, dry cloth.
3. OPERATION:
Note: When testing chargers and cables it’s best to use a device that is less than 50% charged because at higher states
of charge the current draw will typically be reduced.
To check phone/device wall chargers:
1. Plug the USB Multimeter into the wall charger to be tested
a. A properly functioning USB port will supply approximately 4.40 V – 5.25 V. A value significantly different
indicates a defective charger
2. Plug a known good cable into the USB Multimeter (Refer to check cables section)
3. Plug the phone/device into the other end of the cable
4. Note the voltage (V) and current (A) values displayed on the USB Multimeter, the display alternates between voltage
(V) and current (A) every 5 seconds
5. A properly functioning wall charger will typically output 80%-90% of its rated current (A) capacity when charging a
phone/device that is less than 50% charged
a. Note: Maximum charging current (A) may be limited by the device being charged. For example the charging
current (A) of a tablet may be significantly higher than a phone.
Function Range Resolution Accuracy
Voltage 3V-5.5 VDC 0.01V
±2%
Current 0A-3 ADC 0.01A
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