Circuit-test DMR-6600 User manual

USER'S MANUAL
Digital Multimeter
DMR-6600
CIRCUIT-TEST ELECTRONICS
www.circuittest.com

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Introduction
Safety
This meter measures AC/DC Voltage, AC/DC Current, Resistance, Capacitance,
Diode Test and Continuity. Proper use and care of this meter will provide many
years of reliable service.
This symbol adjacent to another symbol, terminal or operating
device indicates that the operator must refer to an explana-
tion in the Operating Instructions to avoid personal injury or
damage to the meter.
This WARNING symbol indicates a potentially hazardous
situation, which if not avoided, could result in death or serious
injury.
This CAUTION symbol indicates a potentially hazardous situ-
ation, which if not avoided, may result damage to the product.
This symbol advises the user that the terminal(s) so marked
must not be connected to a circuit point at which the voltage
with respect to earth ground exceeds (in this case) 1000 VAC
or VDC.
This symbol adjacent to one or more terminals identies them
as being associated with ranges that may, be subjected to
particularly hazardous voltages. For maximum safety, the meter
and test leads should not be handled when these terminals
are energized.
Double Insulation.

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SAFETY INFORMATION
Caution and proper guidelines must be followed for personal and product safety.
Read this instruction manual carefully and completely before using the meter.
Lack of caution or poor safety practices can result in serious injury or death.
• Always start with power off. Set the function switch to the correct setting
before making any measurements and do not change position of the func-
tion switch during measurements.
• Do not use the meter if the meter or test leads look damaged or if there is
doubt that the meter is not operating properly.
• When using the test probes always keep ngers behind the nger guards.
Never touch the exposed probe tip.
• Always consider circuits to be energized. Never assume any equipment
to be de-energized.
• Use caution when working above 35VDC or 25VAC RMS as these volt-
ages pose a shock hazard.
• Never connect unit to AC or DC powered circuits when the function switch
is set to resistance, diode check or continuity ranges.
• Always disconnect the power when performing resistance, or diode tests.
• Always turn off the power to the circuit under test before unsoldering or
breaking the circuits. Small amount of current can be dangerous.
• Disconnect test leads before removing the batteries or the fuse.
• Do not operate the unit unless the case is completely closed.

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SAFETY INSTRUCTIONS
This meter has been designed for safe use, but must be operated with caution.
The rules listed below must be carefully followed for safe operation.
1. NEVER apply voltage or current to the meter that exceeds the specied
maximum:
Input Limits
Function Maximum Input
V DC or V AC 1000V DC, 700V AC
mA DC/AC 200mA DC/AC
A DC/AC 20A DC/AC (30 seconds max every
15 min.)
Resistance, Capacitance,
Continuity, Diode 250V DC/AC rms
2. USE EXTREME CAUTION when working with high voltages.
3. NEVER connect the meter leads across a voltage source while the
function switch is in the current, resistance, or diode mode. Doing so
can damage the meter.
4. ALWAYS discharge lter capacitors in power supplies and disconnect
the power when making resistance or diode tests.
5. ALWAYS turn off the power and disconnect the test leads before open-
ing the covers to replace the fuse or batteries.
6. NEVER operate the meter unless the back cover and the battery and
fuse covers are in place and fastened securely.

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Controls and Jacks
1. 2000 count LCD Display
2. Power ON/OFF button
3. Function switch
4. 20A (positive) input jack
5. μA/mA input jack
6. Backlight button.
7. Positive input jack
8. COM (negative) input jack
Continuity
Diode
Ω Ohms
Volts DC
Volts AC
Amps DC
Amps AC
F Farads
μ micro (farads)
m milli (volts, amps)
M Mega (ohms)
k Kilo (ohms)
n nano (farads)
Symbols and Annunciators

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Specications
Display: 2000 counts LCD display.
Polarity: Automatic, (-) negative polarity indication.
Input Impedance: 10MΩ
Overrange: “1” is displayed.
Low battery indication: “ ” is displayed if the battery voltage drops
below operating voltage.
Measurement rate: 2 times per second, nominal.
Operating Temperature: 0ºC to 50ºC (32ºF to 122ºF) at < 70 % relative
humidity.
Storage temperature: -20ºC to 60ºC (-4ºF to 140ºF) at < 80 % relative
humidity.
Fuse: 200mA/250V (5 x 20mm Fast blow), 20A/250V
(6.35 x 25mm Fast blow - ceramic)
Battery: One 9V, NEDA 1604 battery.
Dimensions: 182 (H) x82 (W) x 55 (D)
Weight: Approx.: 360g
Enclosure: Double molded
Safety / Approvals: This meter is UL and CUL approved and con-
forms to IEC61010-1 for Overvoltage Category
CAT IV 600V and CAT III 1000V.

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DC Voltage
Range Resolution Accuracy
200.0mV 0.1mV
±0.5% of reading ± 2 digits
2.000V 1mV
20.00V 10mV
200.0V 100mV
1000V 1V ±0.8% of reading ± 2 digits
AC Voltage
Range Resolution Accuracy
200.0mV 0.1mV ±1.0% of reading ± 5 digits
2.000V 1mV
±1.0% of reading ± 3 digits20.00V 10mV
200.0V 100mV
700V 1V ±1.2% of reading ± 5 digits
Overload Protection: 0.2A / 250V and 20A / 250V Fuse.
Note: Accuracy is given at 18ºC to 28ºC (65ºF to 83ºF), < 70 % RH
AC Current
Range Resolution Accuracy
2.000mA 1uA ±1.2% of reading ± 3 digits
200.0mA 100uA ±2.0% of reading ± 3 digits
20.00A 10mA ±3% of reading ± 10 digits
DC Current
Range Resolution Accuracy
2.000mA 1uA ±1.0% of reading ± 3 digits
20.00mA 10uA ±1.5% of reading ± 3 digits
200.0mA 100uA
20.00A 10mA ±2.5% of reading ± 10 digits
Overload Protection: 0.2A / 250V and 20A / 250V Fuse.

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Resistance
Range Resolution Accuracy
200.0Ω 0.1Ω ±1.0% of reading ± 4 digits
2.000kΩ 1Ω ±1.0% of reading ± 2 digits
20.00kΩ 10Ω
±1.2% of reading ± 2 digits200.0kΩ 100Ω
2.000MΩ 1kΩ
20.00MΩ 10kΩ ±2.0% of reading ± 5 digits
200.0MΩ 10kΩ ±5.0% of reading ± 10 digits
Capacitance
Range Resolution Accuracy
2.000nF 1pF ±4.0% of reading ± 20digits
20.00nF 10pF ±4.0% of reading ± 3 digits
200.0nF 0.1nF ±4.0% of reading ± 3 digits
2.000uF 1nF
200.0uF 0.1uF ≤20uF ±4.0% of reading ± 15
digits
≥21uF unspecied
Input Protection: 250V dc or 250V ac rms.
Diode Test
Test current: 1mA typical
Open circuit voltage: 2.8V dc typical
Overload protection: 250V dc or ac rms.
Audible continuity
Audible threshold: Less than 50Ω Test current: <0.3mA
Overload protection: 250V dc or ac rms.

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Operating Instructions
WARNING: Risk of electrocution. High-voltage circuits, both AC and DC,
are very dangerous and should be measured with great care.
If “1” appears in the display during a measurement, the value exceeds the
range you have selected. Change to a higher range.
NOTE: On some low AC and DC voltage ranges, with the test leads not con-
nected to a device, the display may show a random, changing reading. This
is normal and is caused by the high-input sensitivity. The reading will stabilize
and give a proper measurement when connected to a circuit.
NOTE: To extend the battery life of the meter the backlight will automatically
turn off in approximate 30 seconds.
DC Voltage Measurements
CAUTION: Do not measure DC voltages if a motor on the circuit is being
switched ON or OFF. Large voltage surges may occur that can damage
the meter.
1. Set the function switch to the position.
2. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the negative side of the circuit and red
test probe tip to the positive side of the circuit.
4. Read the voltage in the display. If polarity is reversed, the display will
show (-) minus sign before the value.
5. Reset the function switch to successively lower positions to obtain a
higher resolution reading.

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AC Voltage Measurements
WARNING: Risk of Electrocution. The probe tips may not be long enough
to contact the live parts inside some 240V outlets for appliances because
the contacts are recessed deep in the outlets. As a result, the reading may
show 0 volts when the outlet actually has voltage on it. Make sure the probe
tips are touching the metal contacts inside the outlet before assuming that
no voltage is present.
CAUTION: Do not measure AC voltages if a motor on the circuit is being
switched ON or OFF. Large voltage surges may occur that can damage
the meter.
1. Set the function switch to the position.
2. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive V jack.
3. Touch the black test probe tip to the negative side of the circuit and the
red test probe tip to the positive side of the circuit.
4. Read the voltage in the display. The display will indicate the proper
decimal point and value. If the polarity is reversed, the display will show
(-) minus before the value.
5. Reset the function switch to successively lower positions to obtain a
higher resolution reading.
DC Current Measurements
CAUTION: Do not make current measurements on the 20A scale for longer
than 30 seconds. Exceeding 30 seconds may cause damage to the meter
and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 200mA DC, set the function switch to
the highest DC mA position and insert the red test lead banana plug
into the (mA) jack.
3. For current measurements up to 20A DC, set the function switch to the
20A range and insert the red test lead banana plug into the (20A) jack.

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AC Current Measurements
CAUTION: Do not make current measurements on the 20A scale for longer
than 30 seconds. Exceeding 30 seconds may cause damage to the meter
and/or the test leads.
1. Insert the black test lead banana plug into the negative COM jack.
2. For current measurements up to 200mA AC, set the function switch to
the highest AC mA position and insert the red test lead banana plug into
the (mA) jack.
3. For current measurements up to 20A AC, set the function switch to the
20A range and insert the red test lead banana plug into the (20A) jack.
4. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
5. Touch the black test probe tip to the negative side of the circuit. Touch
the red test probe tip to the positive side of the circuit.
6. Apply power to the circuit.
7. Read the current in the display.
8. For mA AC measurements, reset the function switch to successively
lower mA DC positions to obtain a higher resolution reading.
WARNING: To avoid electric shock, do not measure AC current on any
circuit whose voltage exceeds 250V AC.
4. Remove power from the circuit under test, then open up the circuit at
the point where you wish to measure current.
5. Touch the black test probe tip to the negative side of the circuit. Touch
the red test probe tip to the positive side of the circuit.
6. Apply power to the circuit.
7. Read the current in the display.
8. For mA DC measurements, reset the function switch to successively
lower mA DC positions to obtain a higher resolution reading.

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Continuity Check
1. Set the function switch to the position.
2. Insert the black lead banana plug into the negative COM jack and the
red test lead banana plug into the positive Ω jack.
3. Touch the test probe tips to the circuit or wire to be tested.
4. If the resistance is less than approximately 50Ω, the audible signal will
sound.
WARNING: To avoid electric shock, never measure continuity on circuits
or wires that have voltage on them.
Resistance Measurements
WARNING: To avoid electric shock, disconnect power to the unit under test
and discharge all capacitors before taking any resistance measurements.
Remove the batteries and unplug the line cords.
1. Set the function switch to the Ω position.
2. Insert the black test lead banana plug into the negative COM jack and
the red test lead banana plug into the positive Ω jack.
3. Touch the test probe tips across the circuit or part under test. It is best
to disconnect one side of the part under test so the rest of the circuit will
not interfere with the resistance reading.
4. Read the resistance in the display.
Diode Test
WARNING: To avoid electric shock, do not test any diode that has
voltage on it.
1. Set the function switch to position.
2. Insert the black test lead banana plug into the negative (-) jack COM
and the red test lead banana plug into the positive (+) jack Ω.

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NOTE: The value indicated in the display during the diode check is the
forward voltage.
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 function switch to the F position.
2. Insert the black test lead banana plug into the negative (-) jack COM
and the red test lead banana plug into the positive (+) jack .
3. Touch the test leads to the capacitor to be tested.
3. Touch the test probe tips to the diode or semiconductor junction you
wish to test. Note the meter reading
4. Reverse the probe polarity by switching probe position. Note this read-
ing.
5. The diode or junction can be evaluated as follows:
A. If one reading shows a value and the other reading shows "1", the
diode is good.
B. If both readings show "1", the device is open.
C. If both readings are very small or 0, the device is shorted.

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Replacing the Battery
1. will appear in the display when the battery drops below the operat-
ing voltage and requires replacing.
2. Turn off the meter and disconnect the test leads from the meter.
3. Remove the two screws securing the battery cover.
4. Replace the 9V battery observing the correct polarity.
5. Replace the cover and secure the two screws.
Maintenance
WARNING: To avoid electric shock, disconnect the test leads from any
source of voltage before removing the battery door.
WARNING: To avoid electric shock, do not operate your meter until the
battery door is in place and fastened securely.
Replacing the Fuses
WARNING: To avoid electric shock, disconnect the test leads from any
source of voltage before removing the fuse cover.
1. Turn off the meter and disconnect both test leads from the meter.
2. Remove the two screws securing the battery/fuse cover and remove the
battery.
3. Remove the old fuse from its holder by gently pulling it out.
4. Replace with fuse of proper size and value (200mA/250V fast blow for
200mA range, 20A/250V fast blow for 20A range).
5. Replace the battery and the cover and tighten the screws.
WARNING: To avoid electric shock, do not operate your meter until the fuse
door is in place and fastened securely.

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Limited Warranty
Circuit-Test Electronics warrants to the original purchaser that this product
be free of defect in material or workmanship for a period of 2 years from the
date of purchase.
Any product which has been subjected to misuse or accidental damage is
excluded from the warranty. Except as stated above, Circuit-Test Electronics
makes no promises or warranties either expressed or implied including war-
ranties of merchantability or the tness for any particular purpose.
M-DMR-6600 / 07R13