UNI-T
UT139A/B/C OPERATING MANUAL
IX. Measurement Instruction
Check the built-in AA 1.5Vx2 battery, display will show the symbol “GS” when lack of power, and then replace
battery in time. It is required to pay attention to the symbol “A ” beside the test pen socket, which reminds
one of the fact that in case of measurement safety, testing voltage or current shall not exceed the specified
value
1. AC and DC Voltage Measurement (See Figure 3)
1) Connect the instrument with the load in parallel for measurement.
2) When the input impedance of the instrument is about 10M Q ,
the load may cause measurement error in the circuit with high
impedance. In most cases, the error can be neglected (0.1%
or lower) if the circuit impedance is under 10k
^ Notes:
• It is forbidden to input voltage higher than 600Vrms, despite
of the possibility of measuring higher voltage, as it may damage r ^ rl
the instrument.
• It is required to avoid the electric shock in measuring high
voltage.
(U TI39A )
(U T 1W B /C )
RANGE
RANGE
MAX MIN
MAX MIN
R £ L A / L B H T l2 S j
R EL A
H i
%
H OLD
H 0 lD /ltC H T (2 S )
5 ELEC T
S ELEC T
V J .C ( A C V )
v .r c ( A C v )
A C / O C
UT 139A/B/C OPERATING MANUAL
UNI-T
2. Resistance Measurement (See Figure 4a)
Connect the instrument with the load in parallel for measurement.
^ Notes:
*. The display will show “OL” when the measured resistance
open-circuit or resistance value exceeds the maximum range
of the instrument.
*. Prior to measuring online resistance, it is necessary to switch
off all powers in the circuits to be measured, and release all
residual charges to ensure the measurement accuracy.
*. In measuring low resistance, a measurement error in resistance
of about 0.1 Q —0.2 o will be resulted by the test pen. In order
to acquire accurate reading, it is required to short circuit the
test pen, take REL relative measurement mode to ensure the
measurement accuracy.
*. Check the test pen for any loosening or other reasons in case
there is a resistance value no less than 0.5Q when test pen
is short circuited.
*. Several seconds may be required for the reading stability when
measuring high resistance, which is normal for high resistance
measurement.
*. By using the resistance measurement function, it is allowed
to make self-checking of the built-in fuse, see (Figuer 4b).
*. No input higher than DC 60V or AC 30V is allowed.
(u ru w o
j ^ (u rjs B / c )
RAHCE
IIA X HIM
MAX UIN
R C lA / U G I T(
2
S)
REL &
M U )
H
0
LD/LIGH
1
{
2
S )
SELECT
SELECT
Figuer 4a
}
(UTlUtA)
j . (U I
13
W / C )
RAMPE
m u t t
IUH U N
MAX HH
BELA/L(CHT(aS)|
BEL A
HO. I)
|HOLO/JCH(
25
)
SELGC*
|
SELECT
Figuer 4b
Содержание TU13BA
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