User Manual

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Multimeter MX1 17
AC voltage
V AC 5V 15V 50V 150V 500V 1500V
Range
(indication)
5V
AC
(f) 15 (a) 50 (b) 15 (a) 50 (b) 15 (a)
Reading
coefficient
x 1 x 1 x 1 x 10 x 10 x 100
Internal
resistance
(1)
31.6kΩ 94.8kΩ 316kΩ 948kΩ 3.16MΩ 9.48MΩ
Accuracy (2) 2.5%
Bandwidth 16Hz à 1kHz
16Hz à
500Hz
Admissible
overload
320V (3)
440V (4)
500V 1500V
(1) specific R: 6.32kΩ/V
(2) in % of end of range
(3) for 1 minute
(4) for 20 seconds
The presence of a DC component falsifies the measurement.
Decibels
• Reminder: measurement of AC voltage may be expressed in decibels
(dB). A decibel is the ratio between two measurements or levels. Level
N in dB for U voltage is mathematically expressed as:
N (dB) = 20log
10
(U/U
0
)
U
0
is reference voltage 0,775V for P
0
power of 1mW for a load of
600Ω.
• Use : The zero level on the red range in dB corresponds to U
0
= 0,775V
for calibre of 5V . Readings are given in dB directly for the calibre 5V
(from -6 to +22dB). For the other calibres, it is possible to read in dB
(approximate value) by adding respectively :
Calibre 5 VAC 15 VAC 50 VAC 150 VAC 500 VAC 1500 VAC
Reading G
in dB
Direct
reading
A = G
A =
G + 10dB
A =
G + 20dB
A =
G + 30dB
A =
G + 40dB
A =
G + 50dB
DC and AC intensities
Always cut the power supply on the circuit to be controlled before
connecting the multimeter to the circuit. If the "Fus" LED is on, change the
faulty fuse(s). (Reminder: minimum voltage for LED = 110V).
Connect the leads to the multimeter and connect in series in the circuit
with:
- the red lead in terminal "A", up to 1.5A,
- the red lead in the "10A" terminal for 10ADC and AC calibre.
Cut power supply before switching.
To obtain intensity in µA, mA or A, multiply the value on the appropriate
scale by the reading coefficient indicated in the table.