26
ELECTRICIAN’S MULTIMETER
AC CURRENT MEASUREMENT
RANGE
RESOLUTION ACCURACY
RANGE
RESOLUTION
ACCURACY
mA
60mA
(45~400Hz)
10µA
±(1.0%+12)
mA
60mA
(400 - 1000Hz)
10µA
±(1.5%+12)
600mA
(45~400Hz
0.1mA
±(2.0%+3)
600mA
(400 - 1000Hz)
0.1mA
±(2.5%+5)
A
20A
(45~400Hz)
10mA
±(3.0%+5)
A
20A
(400 ~ 1000Hz)
10mA
±(3.5%+8)
•
True RMS display. Frequency response: 45~1KHz
•
Non-sine wave frequency response: 45Hz-400Hz
•
AC crest factor at 3000 counts: allows <3.0
•
AC crest factor at 6000 counts (full range): <1.5
•
According to the crest factor, the additional error is calculated as follows:
a. Add 4% when crest factor is 1-2
b. Add 6% when crest factor is 2-2.5
c. Add 8% when crest factor is 2.5-3
•
AC current frequency measurement: 45Hz-1KHz.
•
Min measurement range: mA gear position>35mA, 20A gear position>5.5A.
Accuracy guarantee range: 1~100% of range, open circuit allows least significant digit <2.
•
Input >10A: audio/visual alarm
•
Input >20.1A: “OL” appears on LCD.
!
Overload protection: similar to DC current overload protection
FREQUENCY/DUTY RATIO MEASUREMENT
RANGE
RESOLUTION
ACCURACY
Frequency
9.999Hz~10MHz
0. 001 Hz~100kHz
± ( 0.1%+4)
Duty ratio
0.1%~99.9%
0. 1%
±(2%+5)
Measurement range: 10Hz-10MHz (auto range)
•
<100kHz: 100mVrms <input amplitude <30Vrms
•
>100kHz~1mHz:200mVrms <input amplitude <30Vrms
The duty ratio is only applied to square wave measurement
•
(<10kHz, 300mVrms <input amplitude <30Vrms)
•
Frequency <1kHz: duty ratio is 10.0%-95.0%
•
Frequency >1kHz: duty ratio is 30.0%-70.0%
!
Overload protection: 600V-PTC
