Figure 6
9V battery
Load Resistance: 900Ω:
“Good”: Voltage≥7.8V
“Low”: Voltage 5.7V~ 7.7V
“Bad”: Voltage ≤ 5.6V
12V battery
Load Resistance: 60Ω
“Good”: Voltage ≥10.5V
“Low”: Voltage 7.6V~10.4V
“Bad”: Voltage ≤7.5V
Notes:
When the measured voltage is<0.2V (0.05V-0.19V), no indicator status
will be displayed and the reading will flash for 3 seconds for every 6
second interval.
9. Temperature measurement (only for UT131C, see Figure 5)
1) Switch the dial to temperature test.
2) Insert K-thermocouple into the device and fix the temperature probe to
the measured object. Read the value when it is stable.
Notes:
Only K-thermocouple is applicable. The measured temperature should
be less than 250˚C/482˚F (˚F=˚C*1.8+32)
10. NCV measurement (only for UT131D, see Figure 6)
1) Switch the dial to NCV position
2) Place the device near the measured object. “-” symbol indicates the
intensity of the electric field. More “-” and the higher the buzzer frequency,
the higher the electric field intensity.
3) Intensity of electric field.
“
"-": 50 ~ 100mV
"--": 100 ~ 150mV
"---": 150 ~ 200mV
"----": >200mV
EF": 0 ~ 50mV
11. Additional features
The device enters measurement status in 2 seconds after startup.
The device automatically shuts down if there is no operation for 15 minutes.
You can wake up the device by pressing any key.
To disable auto shutdown, switch the dial to OFF position, long press
HOLD key and turn on the device.
When pressing any key or switching the dial, the buzzer will beep once.
Buzzer Notification
1) Input voltage ≥250V (AC/DC), buzzer will continuously beep indicating
measure range is at limit
2) Input current >10A (AC/DC), buzzer will continuously beep indicating
measure range is at limit
1 min before auto shutdown, 5 continuous beeps.
Before shutdown, 1 long beep.
Low power warnings:
Voltage of the battery < 2.5V, symbol appears and flashes for 3 seconds
every 6 second period. During low power status, the device can still work.
Voltage of the battery < 2.2V, a solid symbol appears, the device cannot
work.
1. DC voltage
Range
Range
Range
Model
Model
Model
Resolution
Resolution
Resolution
Accuracy
Accuracy
Accuracy
2. AC voltage
3. Resistance
4. Continuity, diode
Range
Resolution Remark
If the measured resistance is greater
than 50Ω, the measured circuit will be
regarded as in open status, and the
buzzer does not go off.
If the measured resistance is less
than 10Ω, the measured circuit will
be regarded as in good conduction
status, and the buzzer goes off.
Open circuit voltage: 2.1V, test
current is about 1mA
Silicon PN junction voltage is
about 0.5~0.8V.
Overload protection: 250Vrms(AC/DC)
5. Capacitance（only for UT131A）
Range
Resolution
Accuracy
Under REL mode±(5%+5)
6. Temperature (only for UT131C)
Range
Resolution
Accuracy
IX.Technical specification
Accuracy: ±(% of reading + numerical value in least significant digit slot),
1 Year Warranty
Ambient temperature: 23˚C ±5˚C (73.4˚F±9˚F)
Ambient humidity: ≤75% RH
Notes:
To ensure accuracy, operating temperature should be within 18˚C ~28˚C.
Temperature Coefficient= 0.1*(specified accuracy)/˚C (<18˚C or>28˚C)
Input impedance: about 10MΩ ,
Results might be unstable at mV range when no load is connected. The value
becomes stable once the load is connected. Least significant digit ≤±3
Max input voltage: ±250V, when the voltage≥ 610V, "OL" symbol appears.
Overload protection: 250Vrms(AC/DC)
Input impedance: about 10MΩ ,
Frequency response: 40Hz ~ 400Hz, sine wave RMS (average response).
Max input voltage: ±250V, when the voltage ≥610V, "OL" symbol appears.
Overload protection: 250Vrms (AC/DC)
Measurement result = reading of resistor–reading of shorted test leads
Overload protection: 250Vrms (AC/DC)
Overload protection: 250Vrms(AC/DC)
Tested capacitance≤200nF, adapt REL mode.
Overload protection: 250Vrms (AC/DC)
K thermocouple is only applicable for temperature less than 250˚C/482˚F.
7. DC current
Range
Range
Model
Model
Resolution
Resolution
Accuracy
Accuracy
8. AC current (only for UT131A)
Figure 7a Figure 7b
Protective
case
Screw
Fuse
Protective
case
Screw
Input current> 10A , "OL" symbol appears and buzzer beeps
Overload protection
250Vrms
μA mA range：F1 Fuse 0.2A/250V Φ5×20mm
10A range：F2 Fuse 10A/250V Φ5×20mm
Frequency response: 40 - 400Hz.
Accuracy guarantee range: 5 -100% of the range, shorted circuit allows
least significant digit ≤2
Input current >10.10A, “OL” symbol appears with beeps
Overload protection
250Vrms
μA mA range：F1 Fuse 0.2A/250V Φ5×20 mm
10A range: F2 Fuse 10A/250V Φ5×20mm
X.Maintenance
Warning: Before opening the rear cover, switch off the power supply (remove
test leads from the input terminal and the circuit).
1. General maintenance
1) Clean the case with a damp cloth and detergent. Do not use abradants or
solvents
2) If there is any malfunction, stop using the device and send it to maintenance.
3) The maintenance and service must be conducted by qualified professionals
or designated departments.
2. Replacements (see Figure 7a, Figure 7b)
Battery replacement:
To avoid false reading, replace the battery when the battery indicator appears.
Battery Specification: AAA 1.5V x 2
1) Switch the dial to “OFF “position and remove the test leads from the input
terminal.
2) Take off the protective case. Loosen the screw on battery cover, remove the
cover to replace the battery. Please identify the positive and negative pole.
Fuse replacement:
1) Switch the dial to “OFF “position and remove the test leads from the input
terminal
2) Loosen the both screws on the rear cover, then remove the rear cover to
replace the fuse
Fuse specification
F1 Fuse 0.2A/250V Φ5×20mm ceramic tube
F2 Fuse 10A/250V Φ5×20mm Ceramic tube
UT131A/B
UT131A/C/D
UT131A/C/D
UT131A/B/C/D
UT131A
UT131A/B/C/D
UT131A
UT131A
UT131A
UT131A
UT131A/B/C/D
UT131A/B/C/D
250V
250V
UT131A/B/C/D
UT131A/B/C/D
UT131A/B/C/D
UT131A/B/C/D
UT131A/B/C/D
UT131A/B/C/D
UT131A/D
Figure 5
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