Metrix MX2B Manual De Instrucciones página 14

3-2 AC VOLTAGE
5V
V AC
Range 5 V
AC
(indication)
Reading x 1
coefficient
Internal
10kΩ
resistance
(1)
Accuracy (2)
Bandwidth
Admissible
overload
(1) Specific R: 2kΩ/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
•
of 5V . Readings are given in dB directly for the calibre 5V
+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 "
-
The red lead in the "10A
-
Cut circuit power supply before connecting the multimeter (except with the
clamp).
To obtain intensity in µA, mA or A: multiply the value on the appropriate scale by the
reading coefficient indicated in the table.
15V
(f) 15 (a)
x 1
30kΩ
320V (3)
440V (4)
N (dB) = 20log
V
15
AC AC
A =
G + 10dB
" terminal for 10A
DC
50V 150V
50 (b) 15 (a)
x 1 x 10
100kΩ 300kΩ
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
A": 50µA and clamp in A
DC
DC
13
500V
50 (b)
x 10
1MΩ
500V
)
0
= 0.775V for calibre
0
500 V
AC AC
A =
G + 40dB
.
AC
calibre only.
1500V
15 (a)
x 100
3MΩ
16Hz to
500Hz
1500V
(from -6 to
1500 V
AC
A =
G + 50dB