Sper Scientific 840073 User Manual

Model UT30A: OPERATING MANUAL

Table of Contents (1)

Title

A. Introduction
B. Safety Rules
C. International Electrical Symbols
D. Feature
E. Specification

1. DC Voltage

2. AC Voltage

3. DC Current

4. AC Current

5. Resistance

6. Diode, Transistor,
Continuity Test
F. Operation Plate

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Model UT30A: OPERATING MANUAL

Table of Contents (2)

Title

G. Make Measurements

1. DC Voltage Measurement

2. AC Voltage Measurement

3. DC Current Measurement

4. AC Current Measurement

5. Resistance Measurement

6. Diode measurement

7. Transistor hFE Measurement

8. Continuity test

9. “Hold”, “Power” Button
Function

H. Fuse and Battery replacement
I. Included Accessories

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Page

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Model UT30A: OPERATING MANUAL

A. Introduction

UT30A Multimeter is 3 3/4 digits with steady operations, fashionable structure
and highly reliable hand-held measuring instrument. The meter can measure
DC/AC Voltage, DC/AC Current, Resistance, Diode, Transistor hFE, Continuity,
and etc. It is an ideal carry-on tool for users.

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Model UT30A: OPERATING MANUAL

B. Safety Rules(1)

1. Read the manual carefully before use. Use the Meter only as specified
in this manual, otherwise, the protection provided by the Meter may
be impaired.

2. Do not operate the Meter unless the bottom case has been closed as
terminal can carry voltage.

3. Inspect the insulation of the test leads and no damages to the test
leads before using the Meter.

4. As soon as the battery indicator’s “ ” appears, replace the battery to
ensure accurate readings.

5. Set the Meter to suitable function and range before each measurement.

6. Tested values over the maximum range of each measurement can
cause damages of the Meter or electric shock to users.

7. Do not turn the rotary switch during measurement to avoid damages
of the Meter.

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Model UT30A: OPERATING MANUAL

B. Safety Rules(2)

8. When measuring voltage higher than DC 60V or AC 30Vrms, pay extra
attention to avoid electric shock.

9. Use only 0.5A/250V φ 5X20(mm) fast acting ceramic fuse to replace
the bad one.

10. Do not operate or store the Meter under high temperature or humid
condition, otherwise, the Meter will get worse.

11. Do not change internal circuit to avoid damages to the meter and
danger to the user.

12. Periodically wipe the case with cloth and mild detergent. Do not use
abrasives and solvents.

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Model UT30A: OPERATING MANUAL

C. International Electrical Symbols

AC or DC
AC (Alternating Current)
DC (Direct Current)
Grounding

Double Insulated
Deficiency of Built-In Battery

Diode

Fuse

Continuity Test

Safety Rules

CAUTION-FOR CONTINUED PROTECTION AGAINST FIRE, REPLACE
ONLY WITH FUSE OF THE SPECIFIED VOLTAGE AND CURRENT
RATINGS.

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D. Feature(1)

“

“

“

”

”

”

”

“

D. Feature(2)

”

“

1. DC Voltage

Model UT30A: OPERATING MANUAL

E. Specification(1)

Range

400mV

4V

40V
400V
500V

Resolution

0.1mV
1mV

10mV

100mV

1V

Accuracy

(0.8%+3)

(0.8%+1)

(1%+3)

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E. Specification(2)

3. DC Current

Model UT30A: OPERATING MANUAL

E. Specification(3)

Range

400µA

4mA

40mA

400mA

10A

Resolution

0.1µA
1µA

10µA

100µA

10mA

Accuracy

(1%+2)

(1.2%+2)
(1.5%+2)

Overload Protection: 0.5A/250v fuse. Un-fuse at 10A, measuring time
limit is equal or less than 10 seconds, and time interval should be
equal or over 15 minutes.

Measuring voltage drop: Full range is 400m V.

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4. AC Current

Model UT30A: OPERATING MANUAL

E. Specification(4)

Range

400µA

4mA

40mA

400mA

10A

Resolution

0.1µA
1µA

10µA

100µA

10mA

Accuracy

Overload Protection: 0.5A/250V fuse. Un-fuse at 10A; measuring time
limit is equal to or less than 10 seconds; time interval is equal or over

15 minutes.
Voltage drop: 400mV for full range.
Frequency response: 40Hz-400Hz

Display: RMS of Sine Wave Value (Average Value)

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(1.3%+5)

(2%+5)

5. Resistance

Model UT30A: OPERATING MANUAL

E. Specification(5)

Range

400Ω

4kΩ

40kΩ

400kΩ

4MΩ

40MΩ

Resolution

0.1Ω
1Ω

10Ω

100Ω

1KΩ

10KΩ

Accuracy

(1.2%+2)

(1%+2)

(1.2%+2)
(1.5%+2)

Overload Protection: All ranges are 230V (DC/ AC current).

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Model UT30A: OPERATING MANUAL

E. Specification(6)

6. Diode, Transistor, Continuity Test

Function

Diode

Transistor

Continuity

Test

Range

hFE

Resolution

1mV

1β

0.1Ω

Input

Protection

230V DC

or AC

230V DC

or AC

Overload Protection: 230V (DC/ AC current)

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Remark

3V when open circuit

Ibo 10µA Vce 3V

The buzzer beeps

when the value is less

than 80

Model UT30A: OPERATING MANUAL

F. Operation Plate

1. Liquid Crystal Display

2. Data hold or POWER function Button

3. Rotary Switch

4. Transistor Test Jack

5. Common Input Jack

6. 10A Input Jack

7. V

ΩmA Input Jack for General

Measurement

( figure 1)

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Model UT30A: OPERATING MANUAL

G. Make Measurements(1)

First, set rotary switch to proper position, after several seconds of self­check, the meter will enter measuring state. When “ ” appear on LCD,
replace a new battery to ensure accurate display.

Second,

symbol beside the input jack, warns you when testing current

and voltage, input values must not exceed the limit.

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Model UT30A: OPERATING MANUAL

G. Make Measurements(2)

1. DC Voltage Measurement (figure 2)

1) Never measure voltage value exceeding 500V, although it is possible
to get the reading, which will cause damages to the internal circuit and
hurt users;

2) Measuring value input from “V
mA” (red test lead) and “COM”

Ω

(black test lead.)

3) The Meter has auto-range function

with initial range 400mV, at which,
the meter may display irregular
digits for open Circuit, and come
to ZERO for short circuit, which
are both normal.

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( figure 2 )

Model UT30A: OPERATING MANUAL

G. Make Measurements(3)

4) For ranges except 400mV, input impedance 10M

Ω, this can cause

measuring tolerance at high impedance circuit ,If circuit impedance

is equal or less than 10kΩ, you can ignore the tolerance (0.1% or lower).

5) The meter would clatter with flash of LCD reading if input exceeding

1000V, which warns you should pay extra attention.

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Model UT30A: OPERATING MANUAL

G. Make Measurements(4)

2. AC Voltage Measurement

(figure 3)

Same as DC voltage measurement, however, the meter has auto-range
function with initial range of 4V, and input exceeding 750V would make it
clatter with LCD glittering, which warns you should pay extra attention.

(figure 3)

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Model UT30A: OPERATING MANUAL

G. Make Measurements(5)

3. DC Current Measurement

(figure 4)

1) This range is manual range. Do not measure, when value between

open voltage and earth exceeding safety voltage 60V, to avoid
damages to the Meter or to the instruments under test, and hurt the
user.

2) Before measurement, cut off

the power of object to be
measured and inspect whether
input terminal or rotary switch
is set to the proper range.
Ensure it is proper, and then
you can measure the object
with power on.

(figure 4)

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Model UT30A: OPERATING MANUAL

G. Make Measurements(6)

3) If the magnitude of current is unknown, you should set rotary switch

to the higher range, then adjust to a lower range until a satisfactory
reading is obtained.

4) Measuring value inputs from “V

mA” or “10A” jack (red test leads)

and “COM” jack (black test leads).

5) For “V

mA” input jack, the Meter has 0.5A/250V ( 5x20mm) ceramic

fuse overload protection, if overloaded, the fuse will burn up, so replace

with a new one with the same specification.

6) For 10A input jack, it is unfused. For your safety, every measuring time

should equal to or less than 10 seconds, times interval should be equal

to or over 15 minutes.

7) The meter would clatter with glitter of LCD reading if input exceeding

1000V or overloaded, which warns you pay extra attention.

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Model UT30A: OPERATING MANUAL

G. Make Measurements(7)

4. AC Current Measurement

(figure 5)

Same as DC current measurement.

(figure 5)

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Model UT30A: OPERATING MANUAL

G. Make Measurements(8)

5. Resistance Measurement

(figure 6)

1) To avoid damages to the Meter, when measuring resistance, cut off the

power of the object and no charge in capacitor.

2) Measuring value inputs from “VΩ mA” jack (red test leads) and “COM”

jack (black test leads).

(figure 6)

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Model UT30A: OPERATING MANUAL

G. Make Measurements(9)

3) Wires takes 0.1Ω -0.3Ω tolerance at function of 400Ω when measuring

resistance. To get an accurate reading, you can subtract the short
circuit values of the 2 test leads.

4) It will take several seconds for the display to become stabilize when

resistance value is over 1MΩ, it is normal, because it is auto-range.

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Model UT30A: OPERATING MANUAL

G. Make Measurements(7)

6. Diode measurement (figure 7)

1) Cut off the power supply of the object to avoid damages to the Meter

when measuring diode, no charge in capacitor.

2) Measuring value inputs from “V

jack (black test leads).

( figure 7)

Ω mA” jack (red test leads) and “COM”

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Model UT30A: OPERATING MANUAL

G. Make Measurements(8)

3) When measuring voltage drop of PN, for a good silicon semiconductor

structure, normal positive reading should stay between 0.5V~0.8V.
Negative display being “OL” means open circuit; at this time, the red

test lead is positive pole, and the black one is negative pole. In addition,

“V” acts as unit of this range.

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Model UT30A: OPERATING MANUAL

G. Make Measurements(9)

7. Transistor hFE Measurement

(figure 8)

1) Check that the transistor is PNP or NPN type at first.

2) Connect the transistor to be measured to the corresponding jacks.

3) LCD displays hFE reference value.

4) Measuring condition: Ib 10

µA, Vce 3V

( figure 8)

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Model UT30A: OPERATING MANUAL

G. Make Measurements(10)

8. Continuity test

(figure 9)

Before testing continuity, power off and no charge in capacitor to avoid
damages to the Meter. Measuring value inputs from “VΩ mA” jack (red test
lead) and “COM” jack (black
test lead). If the impedance
of measured circuits is equal
or less than 80Ω, the Meter
would clatter, it means the
circuit is close. Display on
LCD is circuit resistance.
(80

Ω is a dividing value for

OPEN or CLOSE.)

( figure 9)

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Model UT30A: OPERATING MANUAL

G. Make Measurements(11)

9. “Hold”, “Power” Button Function

1) Pressing “Hold” button holds current reading displayed on LCD in
open state, press it again to release the current reading displayed on
LCD.

2) At power on state, press Hold to enter and exit the touch hold mode.

3) At hold mode, it can capture the present reading and display on the
LCD; otherwise, the reading is a random value.

4) The Meter has Auto-power-off function, which switches the Meter off

if it is not used for more than 30 minutes. At this time, press the button
will restart the power.

Hold and power Button are the same one.

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Model UT30A: OPERATING MANUAL

H. Fuse and Battery replacement

1. Remove inputs & test leads from terminals.

2. Remove two rubber feet and two screws from the bottom case.

3. Separate the case bottom from the case top.

4. Replace the battery or fuse with the identical type and specification as
stated on this operating manual.

5. Rejoin the case bottom and case top, and reinstall two screws and
two rubber feet.

(figure 10)

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Model UT30A: OPERATING MANUAL

I. Included Accessories

1. Operating Manual

2. Test Leads

3. 2 pieces of 1.5V (AAA) Battery

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Model UT30A: OPERATING MANUAL

~ END ~

* The manual is subject to changes without separate notice. *

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