CEM 722-449 User manual

OPERATING INSTRUCTION
1000A True RMS DC/AC CLAMP METER

2
Safety
International Safety Symbols
This symbol, adjacent to another symbol or
terminal, indicates the user must refer to the
manual for further information.
This symbol, adjacent to a terminal, indicates that,
under normal use, hazardous voltages may be
present
Double insulation
SAFETY NOTES
Do not exceed the maximum allowable input range of
any function
Do not apply voltage to meter when resistance function
is selected.
Set the function switch OFF when the meter is not in
use.
WARNINGS
Set function switch to the appropriate position before
measuring.
When measuring volts do not switch to
current/resistance modes.
When changing ranges using the selector switch always
disconnect the test leads from the circuit under test.
Do not exceed the maximum rated input limits.
CAUTIONS
Improper use of this meter can cause damage, shock, injury
or death. Read and understand this user manual before

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operating the meter.
Always remove the test leads before replacing the battery.
Inspect the condition of the test leads and the meter itself for
any damage before operating the meter. Repair or replace
any damage before use.
Use great care when making measurements if the voltages
are greater than 25VAC rms or 35VDC. These voltages are
considered a shock hazard.
Remove the battery if the meter is to be stored for long
periods.
Always discharge capacitors and remove power from the
device under test before performing Diode, Resistance or
Continuity tests.
Voltage checks on electrical outlets can be difficult and
misleading because of the uncertainty of connection to the
recessed electrical contacts. Other means should be used
to ensure that the terminals are not "live".
If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may
be impaired.
Input Limits
Function
Maximum Input
A AC
1000A
V DC, V AC
600V DC/AC
Resistance, Diode, Continuity,
Capacitance, Frequency, Duty
Cycle, Test
250V DC/AC
Temperature (℃/℉)
60V DC/24V AC

4
u
n
7
8
5
6
3
4
A
AC mV
kM
DC ¡ã
¡ã
F
C
Hz% 9
2
1
A400A
40A
Meter Description
1. Current clamp
2. Clamp trigger
3. Data Hold and Backlight button
4. Mode select button
5. Hz/% button
6. LCD display
7. COM input jack
8. Rotary Function swith
9. ZERO button
10. Range select button
11. V Ω ℃/℉jack
12. Battery compartment on rear
1. AC DC AC (alternating current)
and DC (direct currrent)
2. Minus sign
3. 8.8.8.8 4000 count (0 to 3999)
measurement reading
4. AUTO AutoRange mode
5. Diode test mode
6. •))) Audible Continuity
7. HOLD Data Hold mode
9.℃,℉,,m,V,A,K,M,Ω,Units of measure list

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Specifications
Function
Range &
Resolution
Accuracy (% of
reading)
DC Current
40.00 AAC
± (2.8% + 10 digits)
400.0 AAC
± (2.8 % + 5 digits)
1000 AAC
± (3.0 % + 5 digits)
AC Current
(True RMS)
40.00 AAC
± (3.0% + 10 digits)
400.0 AAC
± (3.0 % + 5 digits)
1000 AAC
± (3.0 % + 5 digits)
DC Voltage
400.0 mVDC
± (0.8% + 3 digits)
4.000 VDC
± (1.5% + 3 digits)
40.00 VDC
400.0 VDC
600 VDC
± (2.0% + 3 digits)
AC Voltage
(True RMS)
400.0 mVAC
± (0.8% + 20 digits)
4.000 VAC
± (1.8% + 5 digits)
40.00 VAC
400.0 VAC
600 VAC
± (2.5% + 5 digits)
Resistance
400.0 Ω
± (1.0% + 4 digits)
4.000KΩ
± (1.5% + 2 digits)
40.00KΩ
400.0KΩ
4.000MΩ
± (2.5% + 3 digits)
40.00MΩ
± (3.5% + 5 digits)
Capacitance
40.00nF
(5.0% reading + 100
digits)
400.0nF
(3.0% reading + 5
digits)
4.000μF
(3.5% reading + 5
digits)
40.00μF

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100.0μF
(5.0% reading + 5
digits)
Frequency
5.000Hz
(1.5% reading + 5
digits)
50.00Hz
(1.2% reading + 2
digits)
Sensitivity: 10Vrms
min.
500.0Hz
5.000kHz
50.00kHz
100.0kHz
Duty Cycle
0.5 to 99.0%
(1.2% reading + 2
digits)
Pulse width: 100µs - 100ms, Frequency:
5.000Hz ~ 100.0kHz
Temp (type-
K)
(probe
accuracy not
included)
-20 to 1000 C
(3.0% reading + 5 C)
-4 to 1832 F
(3.0% reading + 7 F)
Note: No Autoranging & 400mV AC Voltage Range
Clamp size Opening 1.2" (30mm) approx
Diode Test Test current of 0.3mA typical;
Open circuit voltage 1.5V DC typical.
Continuity Check Threshold <100 ; Test current
< 1mA
Low Battery Indication “ ” is displayed
Overrange Indication “OL” is displayed
Measurements Rate 2 per second, nominal
Input Impedance 7.8M (VDC and VAC)
Display 4000 counts LCD
AC response True rms (AAC and VAC)

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True RMS: The term stands for “Root-Mean-Square,”
which represents the method of calculation of the
voltage or current value. Average responding
multimeters are calibrated to read correctly only on
sine waves and they will read inaccurately on non-
sine wave or distorted signals. True rms meters read
accurately on either type of signal.
ACV/ACA bandwidth 50/60Hz (VAC)
Operating Temperature 14 to 122oF (-10 to 50oC)
Storage Temperature -14 to 140oF (-30 to 60oC)
Relative Humidity 90%(0oC to 30oC); 75%(30oC
to 40oC); 45%(40oC to 50oC)
Altitude Operating: 3000m; Storage
10,000m
Over voltage Category III 600V
Battery One “9V” Battery
Auto OFF approx. 35 minutes
Dimensions/Weight 229x80x49mm/303g
Safety For indoor use and in
accordance with Overvoltage
Category II, Pollution Degree
2. Category II includes local
level, appliance, portable
equipment, etc., with transient
overvoltages less than
Overvoltage Cat. III

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Ω
Operation
NOTICES: Read and understand all warning and
precaution statements listed in the safety
section of this operation manual prior to using
this meter. Set the function select switch to the
OFF position when the meter is not in use.
DC/AC Current Measurements
WARNING: Ensure that the test leads
are
disconnected from the meter before
making current
clamp measurements.
1. Set the Function switch to the 1000A
or400A or
40A range. If the range of the
measured is not known,
select the higher range first then move to the lower
range if necessary.
2. Select AC or DC with the MODE button.
3. Press the trigger to open jaw. Fully enclose one
conductor
to be measured.
4. The clamp meter LCD will display the reading.
DC/AC Voltage Measurements
1. Insert the black test lead into the negative COM terminal
and the
red test lead into the positive Vterminal.
2. Set the function switch to the V position.
3. Select AC or DC with the MODE button.
！ ！
DC DC
AC AC
Ω Ω
CAP CAP
n
n
n
n
A A
+ +
. .
. .
No Yes

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4. Connect the test leads in parallel to the circuit under test.
5. Read the voltage measurement on the LCD display.
Resistance and Continuity Measurements
1. Insert the black test lead into the negative COM terminal
and the
red test lead into the positive terminal.
2. Set the function switch to the •))) position.
3. Use the multifunction MODE button to select resistance.
4. Touch the test probe tips across the circuit or component
under
test. It is best to disconnect one side of the device under
test so
the rest of the circuit will not interfere with the resistance
reading.
5. For Resistance tests, read the resistance on the LCD
display.
6. For Continuity tests, if the resistance is < 100 , a tone
will sound.
Diode Measurements
1. Insert the black test lead banana plug into the negative
COM jack and the red test lead banana plug into the
positive diode jack.
2. Turn the rotary switch to the •))) position.
3. Press the MODE button until “ “ appears in the
display.
4. Touch the test probes to the diode under test. Forward
voltage will indicate 0.4V to 0.7V. Reverse voltage will

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indicate “OL”. Shorted devices will indicate near 0mV
and an open device will indicate “OL” in both polarities.
Capacitance Measurements
WARNING: To avoid electric shock, disconnect power to
the unit under test and discharge all capacitors before
taking any capacitance measurements. Remove the
batteries and unplug the line cords.
1.Set the rotary function switch to the cap position.
2.Insert the black test lead banana plug into the negative
(COM) jack.
Insert the red test lead banana plug into the positive (V)
jack.
3.Touch the test leads to the capacitor to be tested.
4.Read the capacitance value in the display
Frequency or % duty cycle measurements
1. Set the function switch to the V position.
2. Insert the black lead banana plug into the negative
COM jack and the red test lead banana plug into
the positive V jack.
3. Select Hz or % duty with the Hz/% button.
4. Touch the test probe tips to the circuit under test.
5. Read the frequency on the display.
Red Black Black Red
Probe Probe Probe Probe
Forward test Reverse test

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Temperature Measurements
WARNING: To avoid electric shock, disconnect both test
probes from any source of voltage before making a
temperature measurement.
1. Set the function switch to TEMP.
2. Insert the Temperature Probe into the negative
(COM) and the V jacks, making sure to observe the correct
polarity.
3. Select C or F with the MODE button.
4. Touch the Temperature Probe head to the part
whose temperature you wish to measure. Keep the probe
touching the part under test until the reading stabilizes (about
30 seconds).
5. Read the temperature in the display. The digital
reading will indicate the proper decimal point and value.
WARNING: To avoid electric shock, be sure the
thermocouple has been removed before changing to
another measurement function
Data Hold and Backlight
To freeze the LCD meter reading, press the data hold
button. The data hold button is located on the left side of the
meter (top button). While data hold is active, the HOLD
display icon appears on the LCD. Press the data hold button
again to return to normal operation.
Note: The HOLD feature will activate when the Backlight is
turned on. Press the HOLD key again to exit Hold.
The backlight function illuminates the display and is used
when the ambient light to too low to permit viewing of the
displayed readings. Press the (HOLD) button for one

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second to turn the backlight on and press the button a
second time to turn the backlight off.
Manual Ranging
The meter turns on in the autoranging mode. Press the
Range button to go to manual ranging. Each press of the
range button will step to the next range as indicated by the
units and decimal point location. Press and hold the Range
button for two seconds to return to autoranging. Manual
ranging does not function in the AC Current , Diode and
Continuity check functions
Battery Replacement
1. Remove the one rear Phillips head screw
2. Open the battery compartment
3. Replace the Requires one “9V” battery (NEDA1604,
6F22 006P)
4. Re-assemble the meter

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