UM-111, ERA-MERA
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ZAKŁADY WYTWÓRCZE PRZYRZĄDÓW
POMIAROWYCH I SYSTEMÓW
MINIKOMPUTEROWYCH
im. Janka Krasickiego
UM-111
MULTIMETER
Operating Instructions
APPLICATIONS
The Type UM--111 Multimeter is intended to measu-
re:
a/ d.c. and ax. voltages,
b/d.c. currents,and
с/ resistances.
Owing to its many measuring ranges, small size and
simple operation, the UM-111 is a very useful tool
at a testing laboratory, a radio/TV servicing facility
and in all those situations where multirange measure-
ments of voltages, currents and resistances are re-
quired.
A high input resistance (100000 fi/V) for the d.c.
voltmeter ranges as well as provision for extending
the d.c. voltmeter range up to 30 kV by means of
h.v. probe enables eiiJ. veftages at TV kinoscopes
to be measured. DC currents up to 30 A can be measu-
red by means of the TB-7 external shunt.
DESCRIPTION
The Type UM-lll Multimeter employs a measu-
ring system with movement suspended on taut bands
3
and is fitted -*uh a
tingle
xotaiy range switch. The
meter employs only two
jacks
for all measuring ranges.
Provisions has been
made
to protect both instrument
movement by means of
diodes
and measuring circuit
by means of a fuse.
The Type UM-ll 1 is fitted with a polarity switch
to reverse the measured voltage or current polarity
into opposite to
that
marked at the jacks - without
need to change the connection of the leads; the switch
changes the polarity of the connection to the instru-
ment movement.
The series ohmmeter is supplied from built-in bat-
teries R14 (1,5 V) and6F 22 (9 V).
The batteries and the fuse are accommodated in an
individual compartment at the meter bottom and,
in consequence, they can Ъе replaced quickly without
need to dismantle the instrument.
Four scales, are provided at the meter (figure 1):
1/ d.cVax. voltage and d.c. current scales (6 and 7),
21 1 Va£. scale (5),
3/ resistance scale (4).
4
OPERATING CONDITIONS
Ambient temperature (reference): +20°C ±2°C
Operating temperature range: +10 to +30°C
Relative humidity of ambient air: up to 80%
Operating position:
horizontal
SPECIFICATION
Accuracy
d.c. voltage and current ranges:
a.c. voltage ranges (all but 3V):
2,5% b.d.
(45465 Hz)
5% f.sJ.
(45^65 Hz)
f.sjl.
3 V a.c„ range:
resistance ranges:
30 kV d.c. (with SWN-301
probe):
Internal resistance
d.c. vohage ranges:
(at the 1000 Vd.c. range:
a.c. voltage ranges:
Scale length(7):
Scale length(4):
5% f.s.d.
100.000 n/v
31,5 МП)
10.000 n/v
100 mm
75 mm
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