Please read the manual and “Safety Information”
and Warnings carefully before using the meter.
Warning
UT204A is a 4000-count AC/DC digital clamp meter
with stable performance, high degree of safety and
reliability. It is designed with large-scale integrated
circuits and dual integral A/D converter as its core,
overload protection for all ranges and novel structure,
which make it a superb tool for electricians. The
meter can measure AC/DC voltage, AC/DC current,
resistance, diode, continuity, capacitance, frequency
and temperature, etc.
I.Overview
II. Unpacking Inspection
III. Safety Information
Please open the package box and take instrument
out. Please check if following items are deficient or
damaged or not.
1 pc
1 pair
1 pc
1.
2. Test Probes
3. Temperature probe
4. Guarantee certificate
1 pc
Please contact your supplier instantly if any
item is deficient or damaged.
The instrument is designed and manufactured in
compliance with GB4793, IEC61010-1 and IEC
1010-2-032: Double Insulation, Overvoltage CAT
Ⅱ
600V & CAT
Ⅲ
300V and Pollution Degree 2.
A Warning identifies conditions and actions that
may pose hazards to the user, or cause damage
to the Meter or equipment under test. Please pay
attention to warnings and use the meter as
specified as follows, otherwise the protection offered
by the clamp meter would be impaired.
1. Please inspect clamp meter and test leads before
use to avoid damage or abnormal use. Please
do not use the clamp meter again if test leads or
shell insulation is damaged obviously with LCD
display failure or clamp meter cannot operate
normally.
2. It is strictly prohibited to use clamp meter before
covering rear cover and battery cell to avoid
electric shock.
3. Fingers cannot exceed the finger guard of probe
during measurement. Do not touch nude electric
wires, connector, unused input end or circuits
during measurement to avoid electric shock.
4. Function switch must be in correct position
before measurement. It is strictly prohibited to
change ranges during measurement to avoid
damage of clamp meter.
5. Do not exert more than 600V between terminal
of clamp meter and grounding to avoid electric
Shock or damage of clamp meter.
6. To operate the instrument carefully under DC 60V
or AC 30V to avoid electric shock.
7. Do not measure voltage or current which is more
than permissible input value. Be sure to place
function range switch to the maximum range
position if scope of measured value cannot be
determined. Be sure to cut off circuit power and
discharge all capacitors before measuring
of online resistance, diode or circuit. Disconnect
probe and measured circuit then remove probe
from input end of clamp meter and cut off power
after measurement.
8. Replace the battery when“ ” shows on the
LCD to ensure the measuring accuracy.To
take battery out if clamp meter has not been
used for a long time.
9. Please do not alter internal wiring of clamp meter
randomly to avoid instrument damage and safety
danger.
10.Do not store or use clamp meter in environment
of high-temperature, high-humidity, flammables,
explosives and strong current magnetic Field.
11.Please clean the instrument shell by soft cloth
and neutral detergent during maintenance. Do
not use abrasive or solvent to avoid shell
corrosion which may cause any damage to the
clamp meter or personal injury.
IV.Electrical Symbols
Double Insulated
AC
Diode
Warning prompt
AC or DC
To meet European Union standard.
Grounding
DC
Low battery Indication
Buzzing ON/OFF
V.The Meter Structure (See Figure 1)
1. Input end;
2. LCD digit display;
3. Function key: To select basic functions;
4. Measurement function knob: White mark is
initially set value; Blue mark is validated after
selecting blue key;
5. Clamp head trigger: To press
the trigger to loosen clamp
head.
Clamp head will be
again
trigger;
6. Hand protection: It prevents
users from touching any
dangerous area.
7. Clamp head: It is a device to
convert current to voltage. Single
conductor of measured current must pass through
center of clamp head perpendicularly;
1
2
5
7
6
4
3
Figure 1
tightened
if loosening the
measure AC/DC current to
VI.Display Symbols(See Figure 2)
3
4
6
10
11
13
12
5
8 9
15
1
2
16
7
14
Figure 2
1. Indicator for AC Measurement;
2. Indicates negative polarity;
3. Indicator for DC Measurement;
4. Low Battery Indication;
5. under Auto-Ranging Mode;
6. Indicator for Diode Test;
7. Indicator for Continuity Test;
8. Indicator for Duty Cycle Test;
9. Data Hold is Active;
10. Indicator for Relative Measurement;
11. Temperature Unit (
℃
);
12. Resistance Unit (
Ω, KΩ
and M
Ω
);
13. Frequency Unit (Hz);
14. Capacitance Unit (nF and µF);
15. Current Unit (A);
16. Voltage Unit (mV and V)
VII. Key Functions and Automatic
Shutdown
1.HOLD
It is to maintain displayed reading by triggering.
Displayed value will be locked for constant display
by pressing the key once. It can be pressed again
to release locking status and return to common
measurement status.
2.REL
3.SELECT
To switch over between
Note: Automatic shutdown function will be
cancelled if pressing SELECT key to wake up
the meter from the sleep mode.
4.Automatic Shutdown
Clamp meter will power off automatically
(under sleeping status) to save electric energy if
function key and knob switch fail to operate
within 15 minutes during measurement. Clamp
meter will start up automatically (under
working status) by rotating function key under
automatic shutdown status. (Please refer to Item
6 for effective key operation.)
Press down the key to use current reading as the
reference value and reset the display to "0". This
reference value is subtracted every time from
measuring results until you press the key again
to exit the mode.
Note: Automatic shutdown function will be
cancelled by pressing SELECT key for wake-up
under sleeping status.
5.Buzzer
Buzzer will beep if pressing any effective function
key under any measurement range. It will not ring
if the key is invalid. Buzzer will issue 5 warning
voices continuously about 1 minute before
automatic shutdown. It also will issue a long-term
voice before power off.
6.Key validity
Not all keys are valid under any range. As indicated
below, corresponding functions or to wake up the
meter can be achieved only when the keys are valid.
K
ey
Hz
SELECT
N/A
N/A
N/A
REL
HOLD
VIII. Measurement Instructions
1. DC voltage measurement ( ) (See Figure 3)
Warning: Clamp meter cannot be used for
conductive object of which voltage exceeds
AC/DC 600V .
To set knob.
Please place function knob to
To select key functions.
The clamp meter defaults at
DC Voltage and auto-ranging
mode. Press REL
△
to
access relative mode.
To connect load.
V
T o disconnect probe
and measured circuit then
remove probe from input
end after all measurement
operations.
Figure 3
2. AC voltage measurement ( ) (See Figure 4)
Warning: Clamp meter cannot be used for
conductive article of which voltage exceeds
AC/DC 600V
.
To set knob.
Please place function knob to
To select key functions.
Press SELECT button to
select AC voltage mode,
it defaults at auto
-ranging.Press
REL
△
to access
relative mode.
To connect load.
V
~
~
Figure 4
To disconnect probe and
measured circuit then
remove probe from
input end after all measurement operations.
3. Resistance measurement ( )
(See
Figure 5)
Warning: Be sure to cut off circuit power and
discharge residual charge of all capacitors
before load connection.
To set knob.
Please place function
knob to
To select key
functions.
It defaults at Ω
mode and in auto
-ranging.Press REL
△
to access relative mode.
To connect load.
Figure 5
To gain excellent measured result by separating
element from circuit.
T
o disconnect probe and measured circuit then
remove probe from input end after all
measurement operations.
4. Diode measurement ( )
(See Figure 6)
Warning: Be sure to cut off circuit power and
discharge residual charge
of all capacitors before
load connection.
To set knob.
Please place
function knob to
To select functions.
To select diode detection
by pressing SELECT key;
To connect load.
.
Figure 6
To gain excellent measured result by separating
element from circuit.
To disconnect probe and measured circuit then
remove probe from input end after all
measurement operations.
5. Continuity Test ( )
(See Figure 7)
Warning: Be sure to cut off circuit power and
discharge residual charge of all capacitors
before load connection.
To set knob.
Please place function knob to
To select functions.
To select conductance detection by pressing
SELECT key;
To connect load.
.
Figure 7
Buzzer will ring if
measured resistance
is less than
10 . It can ring or
not ring if measured
resistance exceeds 10
.
To disconnect probe and
measured circuit then
remove probe from input
end after all measurement operations.
6. Capacitance measurement ( ) (See
Figure 8)
Warning: Be sure to cut off circuit power and
discharge residual charge of all capacitors
before load connection.
To set knob.
Please place function knob to
To select functions.
To select capacitance detection by pressing
SELECT key;
To connect load.
Figure 8
Measurement notice:
1)Be sure to reset by
pressing REL key
before measurement.
2)Instrument reading will
delay for about 30
seconds normally when
measuring large capacitance.
To disconnect probe and measured circuit then
remove probe from input end after all
measurement operations.
7.Frequency measurement (Hz) (See Figure 9)
Warning: Clamp meter cannot be used for
conductive objecte of which voltage exceeds
AC/DC 600V.
To set knob.
Please place function knob to Hz
To select key functions.
To connect load.
Hz
Figure 9
To disconnect probe and
measured circuit then
remove probe from
input end after all
measurement
operations.
Operating Manual
