Maintenance - Amprobe AM-420 User Manual

Overload protection: 250 V max.
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F1: 315 mA H 250 V fast-fuse, ( 5×20)mm
Resistance Measurement
Range
200Ω
2 kΩ
20 kΩ
200 kΩ
2 MΩ
Open circuit voltage: around 3 VDC
Overload protection: 250 VDC or AC rms
: Continuity
Range Resolution
G
Overload protection: 250 VDC or AC rms
Battery Test
Range Resolution
1.5V
9V
For 1.5V range: Load resistance is around 50Ω.
For 9V range: Load resistance is around 1kΩ.
MAINTENANCE AND REPAIR
If the Meter fails to operate, check battery, test leads, etc., and replace as
necessary.
Double check the followings
1. Replace the fuse or battery if the meter doesn't work.
2. Review the operating instructions for possible mistakes in operating
procedure.
Except for the replacement of the fuse and battery, repair of the meter should be
performed only by an authorized service center or by other qualified instrument
service personnel.
The front panel and case can be cleaned with a mild solution of detergent and
water. Apply sparingly with a soft cloth and allow to dry completely before using.
Do not use aromatic hydrocarbons, Gasoline or chlorinated solvents for cleaning.
:Diode Measurement
G
Open circuit voltage is around 3 VDC.
Resistance >70Ω, buzzer will not sound.
1 Ω
Resistance ≤10Ω, buzzer will sound.
11 < Resistance < 70, not specified.
Open-circuit voltage is around 1.5V. Normal voltage is
1 mV
around 0.5V to 0.8V for silicon PN junction.
0.001 V
0.01 V
Resolution
0.1 Ω
0.001 kΩ
0.01 kΩ
0.1 kΩ
0.001 MΩ
Accuracy
Accuracy
±(8.0% + 1 LSD)
10
Accuracy
±(1.5% + 5 LSD)
±(2.0% + 4 LSD)