Metrix MX1 Manual De Instrucciones página 14

3-2 AC VOLTAGE
V AC 5V
Range 5 V
AC
(indication)
Reading x 1
coefficient
Internal
31.6kΩ
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.
3-2-1 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:
U is reference voltage 0.775V
0
Use: The zero level on the red range in dB corresponds to U
calibre of 5V
5V (from -6 to +22dB). For the other calibres, it is possible to read in dB
(approximate value) by adding respectively:
Calibre V
5
Direct
Reading G
reading
in dB
A = G
3-3 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 10A
-
Cut power supply before switching.
15V
(f) 15 (a)
x 1
94.8kΩ
320V (3)
440V (4)
N (dB) = 20log
. Readings are given in dB directly for the calibre
V
15
AC AC
A =
G + 10dB
50V 150V
50 (b) 15 (a)
x 1 x 10
316kΩ 948kΩ
2.5%
16Hz to 1kHz
(U/U
10
for P power of 1mW for a load of 600Ω.
0
50V 150 V
AC
A = A =
G + 20dB G + 30dB
and
DC
13
500V
50 (b)
x 10
3.16MΩ
500V
)
0
= 0.775V for
0
500 V 1500 V
AC AC
A =
G + 40dB G + 50dB
calibre.
AC
1500V
15 (a)
x 100
9.48MΩ
16Hz to
500Hz
1500V
AC
A =