CM-02 DC/AC CLAMP METER
CM-04 AUTOMOTIVE CLAMP METER
USERS MANUAL
ROVA INSTRUMENTS INC.
EN 61010-2-032
CAT II 600V
CAT III 300V
Pollution Degree 2
Definition of Symbols:
Caution: Refer to Accompanying Documents
Caution: Risk of Electric Shock
Double Insulation
Overvoltage Category I (CAT I):
Equipment for connection to circuits in which measures are
taken to limit the transient overvoltages to an appropriate low
level.
Overvoltage Category II (CAT II):
Energy-consuming equipment to be supplied from the fixed
installation.
Overvoltage Category III (CAT III):
Equipment in fixed installations.
WARNING: If the clamp meter is used in a manner
Not specified by the manufacturer, the protection
Provided by the clamp meter may be impaired.
1
TABLE OF CONTENTS
1.Features .............................................................................................. 1
2. Panel Description.................................................................................. 2
3.Operation Instructions............................................................................. 4
3.1 DC/AC Current Measurements...................................................... 4
3.2. DC/AC Voltage Measurements ..................................................... 5
3.3. Capacitance Measurement........................................................... 6
3.4. Temperature Measurement .......................................................... 7
3.5 Resitance Measurement ............................................................... 8
3.6. Continuity Test........................................................................... 8
3.7. Frequency (Hz) Measurement (CM-02)........................................... 8
3.8. RPM Measurement (CM-04)........................................................ 9
3.9. Relative Reading Me asurements................................................... 9
3.10. Holding the LCD Reading..........................................................10
3.11. Finding the MAX/MIN Value.......................................................10
3.12. Change from Auto-range Mode to Manual Mode............................10
4.Specifications(23 °C ± 5°C ).....................................................................11
5.Battery Replacement.............................................................................15
6.Maintenance & Cleaning........................................................................15
1.Features
1. 10 mA high resolution on 40A DC/AC range
2. Temperature (℃ or
℉)
and Capacitance.
3. One touch zero for DCA adjustment.
4. Auto-range for V, A, Ω, F, and temperature.
5. RPM (CM -04) for automotive application.
6. 23 mm diameter jaw.
7. Fast bargraph display (20 times/sec.) for transient observation.
8. Continuity and frequency measurements.
9. Max/Min and Data Hold functions.
10.600V overload protection for ohm measurement.
11. Ideal for works in crowded switch box or cable areas.
2
2. Pane l Description
1. Transformer Jaw
This is used to pick up current signal. To measure DC/AC current, conductor
must be enclosed by the jaw.
2. Transformer Trigger
This is used to open the jaw.
3. Function Selector Switch
This is used to select the function user desired, such as DCA, ACA, DCV, ACV,
Hz, Ohm and Continuity.
4. AC/DC Select Switch
This is used to select AC or DC voltage or current.
5. Data Hold Button
Once this button is pushed, reading shall be held on the LCD. Press again to
release it.
6. MAX/MIN Hold Button
This button is used to enable the maximum or minimum value to be displayed and
updated during measurement. Press once, minimum value shall be display and
updated. Press again, maximum va lue shall be displayed and updated. Press
again (the third push), clamp meter return to normal measurement mode. Zero
function will be disabled if MAX/MIN is enabled.
3
7. Zero/Relative Button
Once this button is pressed, the current reading shall be set to zero and be used
as a zero reference value for all other subsequent measurement. The
function is also used to remove offset value caused by residual magnetism
remaining in the core for the DC current measurement. The Zero/Relative
function will be disabled if the MAX/MIN button is pressed.
8. LCD
This is a 3 3/4 digit Liquid Crystal Display with maximum indication of 3999.
Function symbols, units, bargraph, sign, decimal points, low battery symbols,
max/min symbols, and zero symbol are included.
9. Low Battery Symbol
When this symbol appears, it means the battery voltage drops below the
minimum required voltage. Refer to Section 5 for battery replacement.
10. Zero/Relative Symbol
When this symbol appears, it means a reference value has been subtracted from
the actual reading. The reading shown is an offseted value. Press and hold the
zero button for 2 seconds to disable this function.
11. Data Hold Symbol
Once this button is pressed, this symbol appears on LCD.
12. Bargraph
Bargraph has forty segments. It displays segments proportional to the actual
reading. Each segment represents one counts.
13. Max/Min Hold Symbol
Once the max/min button is pressed, either MAX or MIN shall be displayed on
LCD
14. Continuity Symbol
If ohm and continuity function is selected, this symbol shall appear on LCD.
15. Units Symbols
Once a function is selected, corresponding unit (V, Ω, A, or Hz) shall be displayed
on LCD.
16.V,Ω, Hz input Terminal
This terminal is used as input for voltage, ohm/continuity, or frequency
measurements.
17.COM Terminal
This terminal is used as common reference input.
18. Hand Strap
Put your hand through the hole of hand strap to avoid accidental drop of the clamp
meter.
4
3.Operation Instructions
3.1. DC/AC Current Measurements
WARNING: Make sure that all the test leads are disconnected from the meter's
terminals for current measurement.
3.1.1 DC Current
a. Set the rotary switch at 40A or 200A and move the sliding switch to DC
b. Push the zero button to adjust the reading to zero.
c. Press the trigger to open the jaw and fully enclose the conductor to be
measured. No air gap is allowed between the two half jaws.
d. Read the measured value from the LCD display.
3.1.2. AC Current
a. Set the rotary switch at 40A or 200A and move the sliding switch to
5
AC.
b. Press the trigger to open the jaw and fully enclose the conductor to
be measured. No air gap is allowed between the two half jaws.
c. Read the measured value from the LCD display.
3.2. DC/AC Voltage Measurements
WARNING: Maximum input for DC V is 600, and for AC V is 600. Do not attempt
to take any voltage measurement that exceeds the limits. Exceeding the limits
could cause electric shock and damage to the clamp meter.
3.2.1.DC Voltage
a. Set the rotary switch at V DC.
b. Insert the test leads into the input jack.
c. Connect the test prods of the test leads in PARALLEL to the circuit to be
measured.
d. Read the measured value from the LCD display.
3.2.2. AC Voltage
a. Set the rotary switch at V AC.
b. Insert the test leads into the input jack.
c. Connect the test prods of the test leads in PARALLEL to the circuit to be
measured.
d. Read the measured value from the LCD display.
6
3.3. Capacitance Measurement
a. Plug the adapter into the terminal
b. Insert the capacitor into the adapter.
c. If the capacitance is less than 4nF, press ZERO (capacitance) button to
zero the residual capacitance.
d. Read the value from LCD.
7
3.4. Temperature Measurement
a. Plug the adapter into the terminal
b. Insert the K-type thermal couple into the adapter
c. Read the temperature from LCD.
8
WARNING: Before taking any in-circuit resistance measurement, remove power
from the circuit being tested and discharge all the capacitors.
3.5 Resistance Measurement
3.5.1. Set the rotary switch at Ω.
3.5.2. Insert the test leads into the input jack.
3.5.3. Connect the test prods of the test leads to the two ends of the resistor or
circuit to be measured.
3.5.4. Read the measured value from the LCD display.
3.6. Continuity Test
3.6.1. Turn the rotary switch to
Ω
position and move the sliding switch to AC
position.
3.6.2. Insert the test leads into the input jack.
3.6.3. Connect the test probes of the test leads to the two ends of the resistor or
circuit to be measured.
3.6.4. Read the measured value from the LCD display.
3.6.5. If the resistance is lower than 40
Ω,
a beeping sound shall be heard.
3.7. Frequency (Hz) Measurement (CM -02)
3.7.1. Set the rotary switch at Hz.
3.7.2. Insert the test leads into the input jack.
3.7.3. Connect the test prods of the test leads in PARALLEL to the signal or
circuit to be measured.
3.7.4. Read the measured value from the LCD display.
9
3.8. RPM Measurement (CM -04)
3.8.1. Set the rotary switch at RPM.
3.8.2. Insert the RPM adapter into the input jack.
3.8.3. Clamp on to the wire connected to the spark plug of any single cylinder of
engine.
3.8..4. Read the RPM value from the LCD display.
3.9. Relative Reading Measurements.
The zero button also can be used to make a relative measurement. Once the
Button is pushed, the current reading is set to zero and a zero symbol shall be
displayed on LCD. All the subsequent measurement shall be displayed as a
relative value with respect to the value being zeroed. Press the zero button for
2 seconds to return to normal mode. But this function is disabled if MAX/MIN
function is enabled. Please watch for symbol displayed on LCD.
10
3.10. Holding the LCD Reading
Press the HOLD button, then the reading will be hold and kept on LCD.
3.11. Finding the MAX/MIN Value
Press the MAX/MIN button to enable the maximum and minimum values to be
recorded and updated during measurement. Push the button once, the
maximum value shall be displayed and updated. Push again (second push), the
minimum value shall be displayed. Push again (third push), MAX/MIN function
shall be disabled and return to the normal measurement mode. If MAX/MIN
button is pressed, the ZERO function will be disabled and the ZERO symbol will
disappear from LCD.
3.12. Change from Auto-range Mode to Manual Mode
If users want to select certain range for specific measurement, they can press the
RANGE button to select appropriate range. To return to auto-range, press and
hold the RANGE button for 2 seconds.
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4.Specifications(23°C ± 5°C )
DC Current:
Range
Resolution
Accuracy
Overload Protection
40A
10mA
±1.5%±2dgts
DC 400A
0-150A
100mA
±1.5%±2dgts
DC 400A
150-200A
100mA
±2.2%±2dgts
DC 400A
AC Current
Accuracy
Overload
Protection
Range Resolution 50/60 Hz 40 - 1KHz
40A
10mA
±1.5%±3dgts ±2.0%±4dgts
AC 400A
0-150A
100mA
±1.5%±3dgts ±2.0%±4dgts
AC 400A
150-200A
100mA
±2.2%±3dgts ±2.5%±4dgts
AC 400A
DC Voltage : (Overload Protection: 600V)
Range Resolution Accuracy Input Impedance
40mV 0.1 mV ±1.5%±3dgts
10MΩ
4V 1 mV ±1.5%±3dgts
5MΩ
40V 10 mV ±1.5%±3dgts
5MΩ
400V 100 mV ±1.5%±3dgts
5MΩ
600V 1V ±1.5%±3dgts
5MΩ
Continuity: (open voltage 0.4V, Overload Protection AC 600V)
Range
Resolution
Accuracy
Overload Protection
40-400Ω
0.1Ω
±1.0%±2dgts
<40.0Ω(approx.)
12
AC Voltage: (Input Impedance: 5 MΩ)
Accuracy
Range
Resolution
50/60 Hz
40 - 1KHz
Overload
Protection
0.01-4V
1mV
±1.5%±5dgts ±2.0%±5dgts
AC 800V
40V
10mV
±1.5%±5dgts ±2.0%±5dgts
AC 800V
400V
100mV
±1.5%±5dgts ±2.0%±5dgts
AC 800V
600V
1V
±1.5%±5dgts ±2.0%±5dgts
AC 800V
¹400mV range is not designed for AC measurement.
Resistance (
Ω)
:
(open voltage 0.4V)
Range
Resolution
Accuracy
Overload Protection
400Ω 0.1Ω
±1.5%±2dgts AC 600V
4KΩ 1Ω
±1.5%±2dgts AC 600V
40KΩ 10Ω
±1.5%±2dgts AC 600V
400KΩ 100Ω
±1.5%±2dgts AC 600V
4MΩ 1KΩ
±1.5%±2dgts AC 600V
40MΩ 10KΩ
±1.5%±2dgts AC 600V
Frequency ( CM -02, Auto, sensitivity selected by pressing RANGE Button):
Range
(Hz)
Resolution
(Hz)
Accuracy Sensitivity O.L Protection
100-100K 0.01 – 100 Hz ±0.5%±2dgts 0.01/0.1/1V AC 600V
RPM (CM -04 with Option RPM Adapter):
Range (Hz) Resolution (RPM) Accuracy Overload Protection
0-9999 1 ±0.5%±2dgts AC 600V
13
TEMPERATURE (K Type Thermal Couple with Adapter,
℃ or ℉
)
Range
Resolution
Accuracy
Overload Protection
-40 – 0 ℃ 0.1 ℃ ±2.0%±2 ℃
AC 600V
0 – 400 ℃ 0.1 ℃ ±0.5%±2 ℃
AC 600V
400 – 1000 ℃ 1 ℃ ±0.5%±2 ℃
AC 600V
-40 – 0 ℉ 0.1 ℉ ±2.0%±4 ℉
AC 600V
0 – 400 ℉ 0.1 ℉ ±0.5%±4 ℉
AC 600V
400 – 1800 ℉ 1 ℉ ±0.5%±4 ℉
AC 600V
CAPACITANCE:
Range
Resolution
Accuracy
Overload Protection
4nF 1pF ±5.0%±0.2 nF AC 600V
40nF 10pF ±5.0%±0.2 nF AC 600V
400nF 0.1nF ±3.0%±0.2 nF AC 600V
4μ
1nF
±3.0%±0.02μF
AC 600V
40μF
10nF
±3.0%±0.02μF
AC 600V
Conductor Size: 23mm max. (approx.)
Battery Type: two 1.5V SUM -3
Display: 3 3/4 LCD with 40 seg. Bargraph
Range Selection: manual
Overload Indication: left most digit blinks
Power Consumption: 10 mA (approx.)
Low battery Indication:
Sampling Time: 2 times/sec.(display)
20 times/sec. (bargraph)
Operating Temperature: -10°C to 50°C
Operating Humidity: less than 85% relative
Altitude: up to 2000M
Storage Temperature: -20°C to 60°C
Storage Humidity: less than 75% relative
14
Dimension: 183mm(L)x63.6mm (W) x 35.6mm (H)
7.2" (L) x 2.5" (W) x 1.4" (H)
Weight: 190g (battery included)
Accessories: Adapter
(for Capacitance and K-type Thermal Couple)
Carrying bag x 1
Users manual x 1
1.5V battery x 2
Option: RPM adapter
15
5.Battery Replacement
When the low battery symbol is displayed on the LCD or LCD display is dark,
replace the old batteries with two new batteries.
5.1. Turn the power off and remove the test leads from the clamp meter.
5.2. Remove the screw of the battery compartment.
5.3. Lift and remove the battery compartment.
5.4. Remove the old batteries.
5.5. Insert two new 1.5V SUM -3 batteries.
5.6.. Replace the battery compartment and secure the screw.
6.Maintenance & Cleaning
Servicing not covered in this manual should only be performed by qualified
personnel. Repairs should only be performed by qualified personnel.
Periodically wipe the case with a damp cloth and detergent; do not use abrasives or
solvents.
Address of Agent, Distributor, Importer, or Manufacturer
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