REED CM-9930 Manual de usuario

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Model CM-9930

True RMS AC/DC

Clamp Meter

Instruction

Manual

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Table of Contents

Safety ............................................................................................ 3

Features......................................................................................... 4

Specications.............................................................................4-6

Instrument Description...............................................................6-7

Operating Instructions..............................................................8-11

DC/AC Measurements ................................................................ 8

Resistance Measurement............................................................ 8

Continuity Check......................................................................... 8

Diode Test................................................................................8-9

AC Current Measurement (Clamp-on) ......................................... 9

DC Current Measurement (Clamp-on)......................................... 9

AC Current Measurement (Direct input)..................................... 10

DC Current Measurement (Direct input)..................................... 10

Capacitance Measurement ....................................................... 10

Frequency Measurement .......................................................... 10

Duty Cycle Measurement .......................................................... 11

Zero Adjustment ....................................................................... 11

Data Hold Operation ................................................................. 11

Relative Operation..................................................................... 11

Backight Operation ................................................................... 11

Fuse and Battery Replacement................................................... 12

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Safety

To ensure safe operation and service of this meter, follow these

instructions:

• Ensure that the DC 9V battery is connected to its snap terminal with the

right polarity and correctly placed in the battery compartment

• Place the Red and Black test leads into the proper input terminal before

taking any measurements

• Remove one of the test leads from the circuit before changing the

measurement range

• Be sure to release the data hold button before taking a new

measurement otherwise the display reading will freeze permanently

• Do not allow the input terminal to exceed the maximum rated voltage

• Always switch the function rotary switch to the OFF position when the

instrument is not operation

• Remove the battery if the instrument will not be used for an extended

period of time

• Even though the ohm and capacitance ranges have an overload

protection circuit, it is prohibited to apply any voltage to the input

terminal when taking measurements

• The water resistance casing is applicable for the front panel on the

instrument only. Do not throw the instrument into water or the meter will

be damaged permanently

• When changing the test leads you should only use the replacements

that have the approval of CAT III-1000V

• Only use a dry cloth to clean the plastic case

Caution: Risk of electric shock.

Caution: Do not apply overload voltage or current to the input

terminal. Always remove test leads before opening

the battery cover.

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Pantone 534 Blue

Pantone 123 Yellow

Pantone 485 Red

Pantone 123 Yellow

Pantone 534 Blue

Black Rich Black -

20/20/20/100

Blue - 100/80/30/5

Yellow - 0/27/100/0

Red - 10/100/100/5

Yellow - 0/27/100/0

Blue - 100/80/30/5

Only if you REALLY need them:

Pantone 534 Blue - 100/80/30/5

Pantone 485 Red - 10/100/100/5

Pantone 123 Yellow - 0/27/100/

Features

• 2in1,2000Aclampmeteranddigitalmultimeter

• LSIcircuitprovideshighreliabilityanddurability

• Overloadprotectioncircuitisprovidedforallranges

• Compact&heavydutyABSandreproofplasticcase

• InstallationcategoryIII

• Pollutiondegree2

• Altitudeupto2000meters

Specifications

Display: 15mm(0.6”)4digitLCD,maxindication4000

MeasurementRange: AC,DC,ohms,diode,Hz,capacitance,duty

 cycleandcontinuitybeeper

Polarity: AutomaticSwitching,“-”indicatesnegative

polarity

CurrentSensor: Halleffectsensor

Zeroadjustment: DC: Pushbuttonadjustment

 Otherranges: Automaticadjustment

Over-input: Indicationof“1”or“-1”

SamplingTime: Approximately0.35seconds

OperatingTemp: 0°Cto50°C(32°Fto122°F)

OperatingHumidity: Lessthan80%RH

Max.JawOpenSize: 60mm(2.36”)diameter

Weight: 380g/0.85lb(includingbattery)

Dimensions: 255x73x38mm(10x2.9x1.5”)

PowerSupply: One9Vbattery(included)

PowerConsumption: ApproximatelyDC5mA

Includes: TL-88-1testleads,one5x20mm500mAfuse,

 andone6AM6X9Vbattery

OptionalAccessories: CarryingCase(CA-05A)

 FusedTestLeads(FC-300)

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Electrical Specifications

Function Range Resolution Accuracy Overload

Protection

DC/AC

Voltage

(DC only)

400mV 0.1mV ± (0.5% + 2d) AC/DC 1000V

4V 0.001V DC:

± (1% + 2d)

AC:

± (1.2% + 5d)

40V 0.01V

400V 0.1V

1000V 1V

DC/AC

Current

(Direct input)

400uA 0.1uA ± (1.2% + 5d) AC/DC 500mA

4000uA 1uA

40mA 0.01mA

400mA 0.1mA

DC/AC

Current

(Clamp on)

400A 0.1A ± (2% + 5d) AC/DC

2000A/1000V

2000A 1A ± (2% + 8d)

Ohms 400 ohm 0.1 ohm ± (1% + 5d) AC/DC 400V

4K ohm 1 ohm

40K ohm 10 ohm

400K ohm 100 ohm

4M ohm 1K ohm ± (2% + 2d)

40M ohm 10K ohm ± (3.5% + 5d)

Capacitance

50nF 10pF ± (3% + 5d)

* See Notes On

Following Page

AC/DC 400V

500nF 100pF

5uF 0.001uF

50uF 0.01uF

Frequency

(>5V)

5Hz 0.001Hz ± (1% + 5d) AC/DC 1000V

50Hz 0.01Hz

500Hz 0.1Hz

5KHz 1Hz

50KHz 0.01KHz

100KHz 0.1KHz

Duty Cycle 1% to 99% 0.10%

Diode Short/non conductance, good/detect test

Continuity Meter will beep if measuring resistance is less than 10 ohm

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Notes:

• True RMS measurement for AC measurements

• Input impedance for AC/DC range is 10M ohm

• AC frequency response is from 45 to 1KHz

• AC specication is tested on sine wave 50/60Hz

• Specications are tested under the environment RF Field Strength

less than 3V/M and frequency less than the 30MHz only

• The accuracy of the capacitance ranges are after the zero

adjustment (see page 11) has been executed

Instrument Description

1. Clamp jaws 10. Manual range select button

2. Trigger 11. Display

3. Function indicator 12. uA/mA direct current input

terminals

4. Function rotary switch

5. DC zero button 13. V, ohm, Hz, diode,

continuity & capacitance

input terminals

6. Relative button

7. Data hold/backlight button

8. V/Hz/% (duty cycle) button 14. Battery cover/compartment

9. Function button 15. Stand

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Display Description

Symbols/

Units Descriptions

Appears when selecting DC modes

Appears when selecting AC modes

Appears when the data hold function is active

Appears when the relative function is active

Appears when battery voltage is low

Appears when the automatic range mode is active

Appears when the continuity beeper is active

mV, V Units for voltage measurements

Ω, KΩ, MΩ Units for resistance measurements

Appears when the diode function is active

Appears when measuring negative DC values

Backlight is on

% Unit for duty cycle measurements

uA, mA, A Units for current measurements

Hz, KHz Units for frequency measurements

nF, uF Units for capacitance measurements

Appears when operating clamp-on current measurements

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Operating Instructions

DC/AC Measurements

Connect the Black test lead into the COM terminal. Connect the Red test

lead into the V terminal. If measuring DC, move the function rotary switch

to the V position and press the function button until the display shows

. If measuring AC, move the function rotary switch to the V position

and press the function button until display shows .

Resistance Measurement

Connect the Black test lead into the COM terminal. Connect the Red test

lead into the Ω terminal. Move the function rotary switch to the Ω position

and press the function button until the display shows Ω.

Note: When LCD displays , the meter is in auto range

mode, meaning the meter will now automatically select the suitable

measurement range. While in auto range mode, press the range button to

hold the range.

Continuity Check

Connect the Black test lead into the COM terminal. Connect the Red test

lead into the Ω terminal. Move the function rotary switch to the position

and press the function button until the display shows .

Note: A beep will sound when the resistance value is less than 10 ohm

Diode Test

Connect the Black test lead into the COM terminal. Connect the Red test

lead into the terminal. Move the function rotary switch to the

position and press the function button until the display shows .

a) When connected with the polarity as shown in Fig. 1, a forward

current ow is established and the approximate diode forward

Voltage (VF) value, in volts, will appear on the display. If the diode

under test is defective a value near .000 (short circuit) or 1 (open

circuit) will be displayed.

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b) When connected as shown in Fig. 2, a reverse check on the

diode is made. If the diode under test is good a 1 will show on the

display. If the diode under test is defective, .000 or other numbers

will be displayed. Proper diode testing should include both steps

a and b.

AC Current Measurement (Clamp-on)

Move the function rotary switch to the 2000A position and press the

function button till the display shows . Press the trigger to open the

current sensor jaws and clamp it around the measuring conductor only

DC Current Measurement (Clamp-on)

Move the function rotary switch to the 2000A position and press the

function button until the display shows . Push the DCA Zero button for

at least 2 seconds to display a value of zero. Press the trigger to open the

current sensor jaws and clamp it around the measuring conductor only

Note: It is recommended to use the auto range mode during

measurements. If you press the range button during auto range mode the

meter will hold the range. For your safety please insert the terminal rubber

cover (Fig. 3) for protection.

Fig.1 Fig.2

Fig.3

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AC Current Measurement (Direct input)

Connect the Black test lead into the COM terminal. Connect the Red test

lead into the uA, mA terminal. If measuring uA (400uA, 4000uA), move the

function rotary switch to the uA position and press the function button

until the display shows .

If measuring mA (40mA, 400mA), move the function rotary switch to the

mA position and press the function button until the display shows .

Open the circuit where the current to be measured is located and

securely connect the test lead in series with the circuit

DC Current Measurement (Direct input)

All the measuring procedures are same as AC current measurement,

except press the function button until the display shows .

Note: The maximum value that can be measured for direct input current

value is AC/DC 400mA. Do not exceed the input current value more than

400mA otherwise the protection fuse will break. When taking a direct input

measurement and the meter shows a value of 0, check if the protection

fuse is broken.

Capacitance Measurement

Note: Due to the possibility of any existing stray capacitance on the

internal circuit board or in the test alligator (for the 50nF and 500nF range)

you should always do the zero adjustment procedure before making any

measurements.

Connect the Black test lead into the COM terminal. Connect the Red test

lead into the terminal. Move the function rotary switch to the

position and press the function button until the display shows nF. During

a capacitance measurement the meter will always perform under the auto

range mode.

Frequency Measurement

Connect the Black test lead into the COM terminal. Connect the Red test

lead into the Hz terminal. Move the function rotary switch to the Hz

position and press the Hz/% button until Hz is displayed on the screen.

During a frequency measurement the meter will always perform under the

auto range mode.

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