Ac Voltage; Decibels; Dc And Ac Intensities - Metrix MX 1 Manual Del Usuario

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AC voltage

V AC
Range
(indication)
Reading
coefficient
Internal
resistance
(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

Decibels

(dB). A decibel is the ratio between two measurements or levels. Level
N in dB for U voltage is mathematically expressed as:
U
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
Reading G
in dB

DC and AC intensities

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:
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.
Multimeter MX1
5V 15V
5V (f) 15 (a)
AC
x 1 x 1
31.6kΩ 94.8kΩ
16Hz à 1kHz
320V (3)
440V (4)
N (dB) = 20log
is reference voltage 0,775V
0
. Readings are given in dB directly for the calibre 5V
5 VAC 15 VAC 50 VAC
Direct
A =
reading
G + 10dB G + 20dB
A = G
Always cut the power supply on the circuit to be controlled before
- the red lead in terminal "A", up to 1.5A,
- the red lead in the "10A" terminal for 10ADC and AC calibre.
50V 150V 500V
50 (b) 15 (a) 50 (b)
x 1 x 10 x 10
316kΩ 948kΩ 3.16MΩ
2.5%
500V
(U/U )
10 0
for P power of 1mW for a load of
0
0
150 VAC 500 VAC
A = A = A =
G + 30dB G + 40dB
1500V
15 (a)
x 100
9.48MΩ
16Hz à
500Hz
1500V
= 0,775V
1500 VAC
A =
G + 50dB
17