REED CM-9930 User manual
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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
Specications.............................................................................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
• 2in1,2000Aclampmeteranddigitalmultimeter
• LSIcircuitprovideshighreliabilityanddurability
• Overloadprotectioncircuitisprovidedforallranges
• Compact&heavydutyABSandreproofplasticcase
• InstallationcategoryIII
• Pollutiondegree2
• Altitudeupto2000meters
Specifications
Display: 15mm(0.6”)4digitLCD,maxindication4000
MeasurementRange: AC,DC,ohms,diode,Hz,capacitance,duty
cycleandcontinuitybeeper
Polarity: AutomaticSwitching,“-”indicatesnegative
polarity
CurrentSensor: Halleffectsensor
Zeroadjustment: DC: Pushbuttonadjustment
Otherranges: Automaticadjustment
Over-input: Indicationof“1”or“-1”
SamplingTime: Approximately0.35seconds
OperatingTemp: 0°Cto50°C(32°Fto122°F)
OperatingHumidity: Lessthan80%RH
Max.JawOpenSize: 60mm(2.36”)diameter
Weight: 380g/0.85lb(includingbattery)
Dimensions: 255x73x38mm(10x2.9x1.5”)
PowerSupply: One9Vbattery(included)
PowerConsumption: ApproximatelyDC5mA
Includes: TL-88-1testleads,one5x20mm500mAfuse,
andone6AM6X9Vbattery
OptionalAccessories: CarryingCase(CA-05A)
FusedTestLeads(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 specication is tested on sine wave 50/60Hz
• Specications 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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Duty Cycle Measurement
All the measuring procedures are same as a frequency measurement
except press the Hz/% until the display shows %.
Zero Adjustment
Open the input terminal and the capacitor that is not connected and press
the relative button until the display shows a value of zero. Connect the
measuring capacitor again and take your measurement.
Data Hold Operation
Press the hold button and the displayed value will hold and will
appear. Press the hold button again to release the data hold function.
Relative Operation
While taking a measurement the meter will store the last measured value.
Press the relative button once and LCD will show a value of zero .
The newly inputted measured values will automatically be deducted from
the last measured values and those new values will appear on the display.
To release the relative measurement function press the relative button,
and the marker will disappear.
Backight Operation
Push the backlight button for about two seconds for the LCD to illuminate.
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Fuse and Battery Replacement
Fuse Replacement
1) The meter is provided with one 5 x 20mm 500mA fuse for current (direct
input) measurements and current range overload protection purposes
2) When the direct input current range isn’t operating check to see if the
fuse is broken
3) To replace the fuse, open the housing case and remove the fuse from
the main PC board
4) Replace the fuse according the specications and replace the housing
case
Battery Replacement
Caution: Remove test leads before opening the battery cover
1) When the LCD display shows you will need to replace the battery
2) Loosen the screw on the battery cover by screwdriver and remove the
battery
3) Replace with 9V battery and replace the cover
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For service on this or any other REED product or information on other
REED products, contact REED Instruments at [email protected]
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