BBC MA 4S User manual

Μ Α 4 S
User manual
Nr. 3.348.330.01 Μ 1-7.1
BBC GOER Z M ETRAW ATT

1) Range switch
2) AC / DC switch
3) Inputs
4) Potentiometer for 0 Ω set
5) Screw for mechanical Zero
/ Ohm/ (+) relay reset
Note: The multimeter MA 4 S is built according to safety regulations
VDE 041 O / DlΝ 57410 It guaranteed if used as the safety of the device
and the operator.
Their safety is not guaranteed if the device is used improperly or carelessly
handled.
It is therefore essential to read before you use the MA4S this
manual carefully and completely and to comply in all respects.

1. Description
The ΜΑ 4 S is a multimeter, which is especially adapted to the needs of power engineering.
It can be used throughout the field of electrical engineering.
This device is very complete range studied - processing and unrivaled protection against
misuse and overload.
Several well-coordinated protection devices protect the device against damage from misuse or
overload within the specified limits for overload:
- Relay with threshold amplifiers and automatic battery monitoring
- Fuse protection with power diodes
- surge arresters and
- Movement-protection diodes
Its rugged construction ensures, in particular in connection with the protective rubber cover, a
lot of protection in rough, mechanical stress.
The linear split V-Α-scale applies to all current and voltage ranges for AC and size
measurements. For resistance measurements, an additional scale exists.
at
voltage internal resistance

Accuracy
Other
DC current and voltage ranges:
AC voltage ranges:
at reference conditions
DIN 43 780 Class 1.5 for DC (relative errors on the scale length, 77 mm)
and 1.5 for class sizes,
changing resistance reference conditions Ambient temperature +20 ° C
Mounting position horizontal frequency 40 ... 500 Hz
Effect sizes according to DIN 43 780 MA 4 The S has a branch rectification and
is calibrated in rms values for sinusoidal AC 50 Hz
Nominal parameters and operating ranges
Temperature Temperature Error
Working temperature range frequency
0. . . +20. . . +40 ° C.
typical
± 0.7 / O/10 Κ in the range 0 ... +40 ° C
-25. . . +40 ° C
15 .. 40 .. 500.. 10 000 Hz
Range 750 V:
15. . . 40 ... 500. .3 000 Hz
The frequency is influenced by grounding the
Terminal "J_"
In the given reference ranges
corresponds to the basic error of class 1.5, in the spheres of influence,
the typical additional error ± 1.5%
<, 0.7% of full scale at an interference field strength of 0.5 mT <0.5% full scale
for open input terminals and ground terminal J_
(interference field strength 40 kV / m, frequency 50 Hz)
error <± 1.5% of full scale when the AC
component is not greater than the selected upper range limit AC current ranges is:
Error <± 2.5% of full scale when the DC component is not greater than the selected
upper range limit
error <± 2.5% of full scale when the DC component is not
greater than 50% of the selected measuring range value
Maximum allowable stresses and Thresholds of the guards must not be exceeded!
When the measured variable rectangular display is 11% too large,
triangular-shaped in measured quantity by 4% too small.
%
%

Power supply for
9 V flat cell battery per IEC 6 F221) number of possible triggers for new battery is
about 10,000
ready about 1 year, with frequent tripping correspondingly less,
to 1.5 V baby cell IECR141)
The battery is charged only with terminal short-circuit or during the measurement.
Instead of brown stone cells may also alkali-manganese cells or NiCd rechargeable
batteries.
NiCd batteries are recommended especially at ambient temperatures below 0 ° C.
Insulation group Βto VDE 0110 Protection Enclosure , terminals to
DIN 40 050
Test voltage 3 kV rms to VDE 0410 V scale length, Α-scale: 0 .. 75: 96mm
Ω-scale O. .. 00: 77 mm
Dimensions 110 mm 181 mm χ χ 62 mm Weight 0.75 kg including batteries
The MA4S is protected by several well-matched protection against damage
from mishandling and overloading.
The bipolar relay is on a threshold amplifier
controlled and protects the voltage ranges 750 mV
... 75 V and the resistance measuring range 100 Ω χ
6 - to 10-times the upper range limit for each area.
max. 5 minutes to about 10 times the upper range limit if the
Overload threshold lies just below the relay.
> 250 V with ^
max. 250 V -
The relay has raised, then the measuring circuit for the region
75 mV/750 μΑ, 2,5 mA ... 250 mA and Ωχ1 separated, the guards of these areas
(security and protection Diode) are still in operation.
:
or
Breaker control:
or resistance
Housing
IP 50 IP 20
3. Overload protection
1.3 Relays
Pickup:
Resilience:
Breaking capacity:
F

3.1.1 Relay Reset
reset the relay, the
in the position
The to the last third when the relay is on.
In order to set main range sellector (1)
needle moves of the scale
By setting the current type selector (2) to the "+",
it shows on the MA 4S, the voltage of the 9 V battery, or resets the relay
immediately and gets armed again.
If the 9V battery voltage are low , the relay will not activated .
There is some time delay between its relay –reset attempt of five seconds .
(loading time of the reset capacitor)
And so the main selector it must be turned in any other position,
than the relay-reset for approximately five seconds .
The relay can be disarmed too, from an accidental mechanical shock.
In any case the relay –reset function it will activate it again.
Never let the meter with the main selector at the relay –reset
position , because it will stress the battery.
3.1.2 Automatic Battery Monitoring
The electronic battery monitoring causes the tripping of the relay in case of
low battery.
The relay reset is then also blocked electronically.
In any case of replacing the battery, a new relay –reset needed,
so to become active.
The internal reference (low –battery) voltage are set to (6.5 V)