Ac Voltage; Decibels; Dc And Ac Intensities - Metrix MX1 Notice De Fonctionnement

AC voltage

Decibels

DC and AC intensities

16
V AC 5V
Range
5V (f)
AC
(indication)
Reading
x 1
coefficient
Internal
resistance 31.6kΩ
(1)
Accuracy (2)
Bandwidth
Admissible
overload
(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.
• 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:
U is reference voltage 0,775V
0
600Ω.
• Use : The zero level on the red range in dB corresponds to U
for calibre of 5V
(from -6 to +22dB). For the other calibres, it is possible to read in dB
(approximate value) by adding respectively :
Calibre 5 VAC
Direct
reading
Reading G
in dB
A = G
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.
15V 50V
15 (a) 50 (b)
x 1 x 1
94.8kΩ 316kΩ
2.5%
16Hz à 1kHz
320V (3)
440V (4)
N (dB) = 20log
for P
. Readings are given in dB directly for the calibre 5V
15 VAC 50 VAC
A = A =
G + 10dB G + 20dB
150V 500V
15 (a) 50 (b)
x 10 x 10
948kΩ 3.16MΩ
500V
(U/U )
10 0
power of 1mW for a load of
0
150 VAC 500 VAC
A = A =
G + 30dB G + 40dB
Multimeter MX1
English
1500V
15 (a)
x 100
9.48MΩ
16Hz à
500Hz
1500V
= 0,775V
0
1500 VAC
A =
G + 50dB