Unit UT51 User manual

Introduction
Digital Multimeter UT50 series (hereafter
referred to as "the Meter") are 2000-count
hand-held instruments featuring stable
performance, versatile functions, high degree
of reliability&accuracy. They are designed
with large-scale integrated circuits, dual
integral A/D converter as well as overloaded
protection. The series can measure AC/DC
voltage, AC/DC current, resistance,
capacitance, frequency, temperature, diode
and continuity, making the series a perfect
tool for users.
Your Meter's Features
z32 ranges.
zLiquid Crystal Display, digits height is 27mm.
zOverload display l.
zMaximum display 1999 (3 1/2 digit).
zFull range overload protection.
zAuto-Power Off (For UT53, UT54 and UT55
ONLY).
zTemperature:
Operating:0oCto 40oC(32 0Fto 104 0F).
Storing:-10oCto 50oC(14 0Fto 122 0F).
zAltitude:
Operating: 2000m
Storing: 10000m.
zRelative Humidity:Max. relative humidity
80% for temperature up to 31oCdecreasing
linearly to 50% relative humidity at 40oC.
zLow Battery display "".
zStrap for easy carry.
zTilt stand design, three observation angles,
is in favor of reading display.
zDimension: 190mm x 88mm x 34mm.
zWeight: Meter only(excluding test leads)
about 270g .Meter + holster + tilt stand
about 550g.
zBattery Type: 9V NEDA 1604 or 6F22 or 006P
Specifications
Accuracy is specified for one year after calibration,
at operating temperatures 23oC+/- 5oC, with relative
humidity at < 75%.Accuracy specifications take
the form of:+/- (a% readings +digits )
Direct Current Voltage (DC Voltage)
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Overload protection: 250VDC or AC RMS for
200mV range. 750VRMS or 1000Vp-p for other
ranges.
Alternating Current Voltage (AC Voltage)
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Frequency: 40Hz-400Hz .
Overload protection: 250VDC or AC RMS for
200mV range. 750VRMS or 1000Vp-p for other
ranges.
Display: Average Value (RMS of Sine Wave).
200mV
2V
20V
200V
1000V
100μV
1mV
10mV
100mV
1V
Range Resolution
(0.5% +1)
UT51 UT 52 UT53 UT54 UT55
Accuracy
(0.8% +2)
200mV
2V
20V
200V
750V
100μV
1mV
10mV
100mV
1V
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(1.2% +3)
(0.8% +3)
(1.2% +3)
Direct Current Current (DC Current)
20μA
200μA
2mA
20mA
200mA
2A
10A
20A
0.01μA
0.1 μA
1μA
10μA
100 μA
1mA
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(2%+5)
(0.8%+1)
(1.5%+1 )
(0.8%+1)
10mA
(1.5%+1)
(2%+5)
(2%+5 )
Overload protection:
For UT51:
2A, 250V fast acting fuse, φ5x20mm(below
2A range)
10A, 250V fast acting fuse,φ5x20mm(at 10A
range) .
For UT52/53/54/55:
315mA, 250V fast acting fuse, φ5x20mm (No
fuse at 20A range).
Max current input :
For UT51: 10A (The measurement time for high
current should be less than 10 seconds, and
the interval time between two measurements
should be greater than 15 minutes.
For UT52/53/54/55: 20A (The measurement
time for high current should be less than 15
seconds, and the interval time between two
measurements should be greater than 15
minutes.
Alternating Current Current (AC Current)
200μA
2mA
20mA
200mA
2A
10A
20A
0.1μA
1μA
10μA
100 μA
1mA
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(1%+3)
(1%+3)
10mA
(1.8%+3)
(3%+7)
(3%+7 )
(1.8%+3)
(1.8%+3)
Overload protection:
For UT51:
2A, 250V fast acting fuse, φ5x20mm(below 2A range)
10A, 250V fast acting fuse,φ5x20mm(at 10A range) .
For UT52/53/54/55:
315mA, 250V fast acting fuse,φ5x20mm (No fuse
at 20A range).
Max current input :
For UT51: 10A (The measurement time for high
current should be less than 10 seconds, and the
interval time between two measurements should be
greater than 15 minutes.
For UT52/53/54/55: 20A (The measurement time
for high current should be less than 15 seconds, and
the interval time between two measurements should
be greater than 15 minutes.
Measuring voltage drop:
200mV for full ranges.
Display: Average Value (RMS of Sine Wave ) .
Capacitance
Testing signal: around 400Hz 40mVrms
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(4% +3)
2nF
20nF
200nF
2μF
20μF
1pF
10pF
100pF
1nF
10nF
Resistance
200Ω
2KΩ
20KΩ
200KΩ
2MΩ
20MΩ
200MΩ
0.1Ω
1Ω
10Ω
100Ω
1KΩ
10KΩ
100KΩ
Range Resolution UT51 UT 52 UT53 UT54 UT55
Accuracy
(0.8% +1)
(0.8% +3)
(1% +2)
[5%(-10) +10]
Frequency
Range Resolution UT51
Accuracy
UT52 UT54 UT55 UT53
2kHz
20kHz
1Hz
10Hz
(2%+5)
(1.5%+5)
Voltage at open circuit: 700mV (200MΩrange,
open circuit voltage around 3V) .
Overload protection: 250VDC or AC RMS for all
ranges.
Caution: At 200MΩrange, as test lead is short
circuit the LCD normally display 10 digits is normal,
deduct
the 10 digits from the measured reading
during
measuring.
Unpacking Inspection
Safety Information
Unpack the carton and take out the Meter. Check
the following accessories for any missing or
damaged component. Please contact your
dealership immediately if any missing or
damaged component is found.
UT50 Series are designed and manufactured in
compliance with: IEC61010, CATⅠ1000V, CAT
Ⅱ600V and CATⅢ300V, Double Insulation and
Pollution Degree.
Operating Manual------1pc
Test Leads --------------1 pair
WRN-01B Thermocouple----1set
(For UT53,UT55 Only)
Holster (Optional)
Warnings
Use the meter as specified in the manual,
otherwise the protection offered by the Meter
may be impaired.
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it may cause electric shock.
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insulation or broken wires.
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terminals and ensure good contact between
them.
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the Meter, otherwise it may cause electric
shock or damage to the Meter.
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model or similar electrical specifications.
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voltage above 1000V between COM and
grounding.
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above 60VDC or 30VAC RMS.
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batteries as soon as " "appears.
ƔShut off the power timely after the measurements
complete. Take out the batteries if not used for
a long time.
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temperature, high moisture. The performance
of the Meter may be compromised if
moisture-affected.
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injury, do not alter internal wiring randomly.
Caution
about 2.8V
about 2.8V

P/N:110401104336X
Making Measurements
1On/Off Switch
3Liquid Crystal Display
5Rotary switch
7Input jack
2Capacitance jack
4Temperature jack
6Transistor jack
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Caution
Caution
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""
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" "
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" "
" "
Caution
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" "
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Measuring Resistance
Caution
Measuring Capacitance
Before measuring capacitance, remember it takes
time for zeroing when changing ranges. Floating
reading does not affect accuracy.
1) To avoid damage to the Meter or the equipment
under testing, disconnect circuit powers and
discharge capacitors before measuring
capacitance.
2) Connect capacitor to the capacitance jack.
3) It takes some time to get a stable reading
when measuring high capacitance.
4) Unit: 1pF=10-6μF, 1nF = 10-3μF
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" "
" "
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Measuring Frequency
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Maintenance
General Service
2. Turn the Meter power OFF
3. Remove the holster from the Meter.
4. Remove rubber feet and screws from the case
bottom, and separate the case bottom from
the case top.
5. Remove the battery from the battery compartment.
6. Replace the battery with a new 9V battery
(NEDA 1604 or 6F22 or 006P).
7. Rejoin the case bottom and case top, and install
the screws and rubber feet.
Replacing the Fuses
To avoid electrical shock or arc blast, or personal
injury or damage to the Meter, use specified
fuses ONLY in accordance with the following
procedure.
To replace the Meter's fuse:
1. Disconnect the connection between the testing
leads and the circuit under test, and remove
the testing leads away from the input terminals
of the Meter.
2. Turn the Meter power OFF.
3. Remove the rubber feet and screws from the
case bottom, and separate the case bottom
from the case top.
4. Remove the fuse by gently prying one end loose,
and then take out the fuse from its bracket.
5. Install ONLY replacement fuses with the
identical type and specification as follows and
make sure the fuse is fixed firmly in the bracket.
UT51: 2A, 250V fast acting fuse,φ5x20mm
(below 2A range)
10A, 250V fast acting fuse,φ5x20mm (at 10A
range)
Caution
Caution
" "
" "
1) Please refer to DC Current Caution 1, 2, 3.
" " " " " " " "
Using Holster
Three different ways to use holster:
1. Set holster parallel on the table, do not open
the tilt stand (see diagram 1).
2. Set holster in a small angle on the table, tilt
it up by the first part of tilt stand (see diagram 2)
3. Set holster in a large angle on the table, tilt it
up by all two parts of tilt stand (see diagram 3).
Figure1 Figure2 Figure3
UT52/53/54/55: 315mA, 250V fast acting fuse,
φ5x20mm
6. Rejoin the case bottom and the case top, and
install the screw and rubber feet
Replacement of fuses is seldom required.
Burning of a fuse always results from the
improper operation.
Using Strap
1. Put the front end of the strap through the round
metal of the Meter, see part 1 of the below
diagram.
2. Put the bottom end of the strap through the
front part and tide it up, see part 2 of the below
diagram.
~ END ~
* The manual is subject to changes without separate notice. *
about 2.8V
as soon as possible
set to a higher
measurement range.
2A for UT51
set to a higher
measurement range.
2A for UT51
2A for UT51
Cut off the power to the circuit and discharge
all capacitors before measuring resistance.
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which should be subtracted from subsequent
measured readings. For example, when
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which should substract the 10 digits to obtain
a accurate reading.
object
measuring
about 15 minutes, which only consume 7