Iskra MI 7056 Application Instructions

MI 7056
APPLICATION INSTRUCTIONS
1. GENERAL DESCRIPTION
Due to small dimensions and electrical characteristics the MI 7056
multimeter is intended for a wide range of users. It is especially
convenient for service workshops where electrotechanical and radio-
television apparatuses are repaired. Its main advantage is a large
choice of measuring ranges as well as high input resistance. It is
possible to measure DC and AC voltages and currents, amplification
or weakening on four-poles and resistance. Measuring wires and
connection sockets are safe. A rubber border increases mechanical
resistance of the instrument, and makes the instrument user-friendly.
2. TECHNICAL DATA
•
ratings:
•
length of basic scales:
•
pointer tilt:
•
accuracy class:
•
characteristic resistance:
•
dimensions:
•
mass:
3. RATINGS WITH CHARACTERISTIC DATA
3.1
VOLTAGE RATINGS
DC
Internal
Voltage Voltage
resistance
100 mV 10 V
2 kΩ
1 V 30 V
20 kΩ
10 V 100 V
200 kΩ
30 V 300 V
600 kΩ
100 V 600 V
2 MΩ
300 V
6 MΩ
600 V
12 MΩ
0 dB corresponds to 0.775 V / 600 Ω (1 mW / 600 Ω)
1)
3.2
CURRENT RATINGS
DC
Current Voltage drop approx.
50 µA
100 mV
1 mA 500 mV
10 mA 500 mV
100 mA 500 mV
1A 190 mV
3.3
RESISTANCE RANGES
Measuring range and scale middle
1 Ω ... 35 Ω ... 5 kΩ
x 1
10 Ω ... 350 Ω ... 50 kΩ
x 10
100 Ω ... 3,5 kΩ ... 500 kΩ
x 100
2)
At battery voltage 1.5 V
4. ACCURACY AND INFLUENCES
4.1
ERROR AT REFERENCE CONDITIONS
Stated errors are valid at horizontal position, at ambient temperature
20°C, at sine form of alternating signals of frequency 50 ... 60 Hz
under the condition that the vave of the alternating signal does not
deviate for more than 1% from the sine curve.
23
approx. 87 mm
0 ... 100°∠
2.5
20 kΩ / V
DC
6,67 kΩ / V
AC
104 x 143 x 40 mm
approx. 350 g
AC
1)
dB Internal
scale resistance
-10dB...+22dB
66,7 kΩ
+10dB
200 kΩ
+20dB
667 kΩ
+30dB
2 MΩ
+40dB
4 MΩ
AC
Current Voltage drop
3 mA 1,5 V
30 mA 1,6 V
300 mA 1,6 V
3 A 1,8 V
Max.
Battery supply
measuring
source
2)
current
45 mA
4,5 mA 1,5 V
0,45 mA (IEC R6)
Current and voltage ratings:
•
direct and alternate:
When measuring within the range from 0 to 30 mA, circuit resistance
should be min. 150 kΩ.
•
resistance ratings:
4.2
INFLUENCE OF FREQUENCY
•
all alternating ratings:
4.3
TEMPERATURE INFLUENCE
At modified ambient temperature for 10 K within the range from 0 to
40°C
•
direct ratings:
100 mV / 50 µA:
•
alternating ratings:
5. CONFORMITY
STANDARDS
•
Electrical safety (EN 61010-1)
− Installation catergory: CAT
− Degree of pollution: 2
•
Electromagnetic compatibillity
− Emission: EN 50081-2
− Immunity: EN 50082-2
6. PROTECTION AGAINST OVERLOAD
The measuring system is protected against overload with silicon
diodes. A rating selector switch and a printed circuit are protected
with F 3.15 A fuse.
Fuse Switching capacity
F 3,15 1 kA, 440 V
cos ϕ = 1,0
IEC 127
7. BATTERY FOR MEASURING RESISTANCE
1 x 1.5 V IEC R6; a battery which is protected against the discharge of
electrolyte is recommended.
8. GENERAL INSTRUCTIONS
For correct and safe application of the meter the following data should
be considered:
During the measurement put the instrument, which is protected with
the rubber border, in a horizontal position. Insert a battery in order to
measure resistance. Remove the rubber protector and the instrument
base, and insert the 1.5 V battery (IEC R6) into its bed. The battery is
used only for supplying ohmic ranges. The contacts should be clean
and reliable. Check the battery condition by setting the ratings selector
switch to Ω x 1 range. Short circuit connection terminals COM and 50
µA, 100 mV, A, Ω, and set final tilt with the knob (0 on Ω scale). If
this can not be set or if the tilt is not constant, replace the battery.
Completely switch off the instrument before removing the base.
1. A knob for the regulation of the pointer zero position
2. Ratings selector switch
3. A knob for zero setting on Ω scale
4. Connection safety sockets
± 2.5 % of range
± 2.5 % of scale length
± 2.5 % within the frequency range
from 30 Hz to 1 kHz
± 1 % of range
± 2.5 % of range
± 1.5 % of range
WITH INTERNATIONAL
300V max, CAT 600V max
Dimensions (mm)
AC ∅ 6,3 x 32