Craftsman 19741 User manual

Owner's Manual
AC/DC True RMS
Clamp Meter
Model No.
19741
CAUTION: Read, understand and e Safety
follow Safety Rules and Operating e Operation
Instructions in this manual before e Maintenance
using this product. e Espajiol
© Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A
www.craftsman.com 012318

TABLE OF CONTENTS
Warranty
Safety Instructions
Safety Symbols
Control and Jacks
Symbols and Annunciators
Specifications
Operating Instructions
AC Current Measurements
DC Current Measurements
AC Voltage Measurements
DC Voltage Measurements
Non-Contact Voltage Detector
Resistance Measurements
Continuity Measurements
Diode Testing
Capacitance Measurements
Frequency/Duty Cycle Measurements
Temperature Measurements
Auto Power Off
Auto/Manual Ranging
Data Hold
Backlight
Mode
Relative
Maintenance
Battery Replacement
Troubleshooting
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to)
CRAFTSMAN LIMITED WARRANTY
FOR TWO YEARS from the date of sale this product is warranted
against any defects in material or workmanship.
WITH PROOF OF SALE a defective product will be replaced free of
charge. This warranty does not cover batteries, which are expendable
parts that can wear out from normal use within the warranty period.
This TWO YEAR warranty is void if this product is ever used while
providing commercial service or if rented to another person. For 90
DAY commercial and rental use terms, see the Craftsman warranty
web page. This warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.
Sears Brands Management Corporation,
Hoffman Estates, IL 60179
For Customer Assistance Call 9am - 5pm (ET)
Monday through Friday 800-906-6002
WARNING: USE EXTREME CAUTION IN THE USE OF THIS
DEVICE. Improper use of this device can result in injury or
death. Follow all safeguards suggested in this manual in addition
to the normal safety precautions used in working with electrical
circuits. DO NOT service this device if you are not qualified to do
so.

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
specified maximum:
Input Limits
Function Maximum
Input
V DC, VAC, Frequency, Duty Cycle 600V DC/AC
AAC, ADC 400A DC / AC
Resistance , Diode test , Continuity 250V DC/AC
Capacitance
Temperature(°F/‘C ) 250V DC/AC
2. USE EXTREME CAUTION when working with high voltages
3. DO NOT measure voltage if the voltage on the "COM" input
jack exceeds 240V above earth ground
4. DONOT measure current of circuits whose voltage is greater
than 240V above earth ground
5. NEVER connect the meter leads across a voltage source
while the function switch is in the resistance or diode mode.
Doing so can damage the meter
6. ALWAYS turn off the power and disconnect the test leads
before opening the doors to replace the fuse or batteries
7. NEVER operate the meter unless the back cover is in place
and fastened securely
AN
SAFETY SYMBOLS
This symbol adjacent to another symbol,
terminal or operating device indicates that the
operator must refer to an explanation 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 situation, which if not avoided, may
result in damage to the meter
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) 600
VAC or VDC
This symbol adjacent to one or more terminals
identifies them as being associated with ranges
that may, in normal use, be subjected to
particularly hazardous voltages. For maximum
safety, the meter and its test leads should not
be handled when these terminals are energized
This symbol indicates that a device is protected
throughout by double insulation or reinforced
insulation

CONTROLS AND JACKS
Current clamp
Non-Contact AC Voltage Indicator Light
Clamp Trigger
Rotary Function dial
Data HOLD/Back light button
Relative button
LCD display
MODE select button
. RANGE button
10. Hz/% hold button
11. COM input jack
12. VIQ CAP TEMP Hz jack
13. Battery Cover (Back side)
OSS
oe
BE Ue ests
1. AC Alternating current / DC Direct Current
2. Minus sign
3. 4000 Count Display (0-399)
4, AUTO AutoRange mode
5, ZERO Relative Mode
6. DIODE TEST MODE
7, AUDIBLE CONTINUITY
8, DATA HOLD MODE
9. °C, °F,u, m, V, A, K, M, Q - Units of measure
10. Hz % - Frequency/duty cycle test mode
) ©O® © @
a _
AUTO-Dt-)) HOLD ZERO kMQHz/F
V
SPECIFICATIONS
Function Range & Resolution Accuracy (% of reading)
40.00 AAC + (2.5 % + 8 digits)
AC Current : =
(True RMS) 400 .OAAC £(2.8%+5 digits)
een All AC current ranges are specified from 5% of range to 100% of range
40.00 ADC + (2.5 % +5 digits)
DC Current =
400 .OADC + (2.8 % +5 digits)
400.0 mVDC + (0.8% + 2 digits)
4.000 VDC
DC Voltage | 40.00 VDC 9 is
4000 VDC + (1.5% + 2digits)
600VDC +(2% +2 digits)
400.0mVAC + (1.5% + 30 digits)
AC Voltage eC £ (1.5% + 8 digits)
oO igi
ree) [aOR }
400.0 VAC
600 VAC + (2.0% + 8 digits)
AIlAC Voltage ranges are specified from 5% of range to 100% of range
400.0 & + (1.0% + 4 digits)
4.000K 2
Resistance
aoe
-
+
(1.5%
+
2
digits)
4.000M 2 + (2.5% + 3 digits)
40.00M2 + (3.5% + 5 digits)
Capacitance | 40.00nF +(4.0% reading + 20 digits)
400.0nF
4.000 1 F +(3% reading + 5 digits)
40.00 uF
100.0 uF +(4.0% reading + 10 digits)

Frequency
10-10kHz
Sensitivity:100V(<50Hz);50V(50 to
400Hz;15V(401Hz to 10kHz)
+(1.5% reading + 2 digits)
not included)
Temp -20.0 to 760.0°C + (3%rdg+5°C)
(type-K) -4,0 to1400.0°F + (3%rdg+9°F)
(probe accuracy
NOTE: Accuracy specifications consist of two elements:
* (% reading) This is the accuracy of the measurement circuit.
e (+ digits) This is the accuracy of the analog to digital converter
NOTE: Accuracy is stated at 65°F to 83°F (18°C to 28°C) and less
than 70% RH
Clamp size
Diode Test
Continuity Check
Temperature sensor
Input Impedance
Display
AC V bandwidth
AC A bandwidth
AC response
Operating Temperature
Storage Temperature
Operating Humidity
Storage Humidity
Operating Altitude
Over voltage
Battery
Auto OFF
Dimensions/Weight
Safety
Opening 1.5" (38mm) approx.
Open circuit voltage <1.5V DC;
Test current 0.3mA (typical)
Audible signal <150Q;
Test current < 0.5mA
Type K thermocouple
10MQ (VDC and VAC)
3-3/4 digits (4000 counts) LCD
50Hz to 400Hz
50/60Hz
True RMS
41 to 104°F (5 to 40°C)
-4 to 140°F (-20 to 60°C)
Max 80% up to 87°F (31°C) decreasing
linearly to 50% at 104°F (40°C)
<80%
7000ft. (2000 meters) maximum
Category III 600V
(1) 9V Battery
approx. 30 minutes
7.78x2.64x1.64" meter only
(199.93x68.07x41.73mm)
8.2440z. (233.7g) mete only without
battery
This meter is intended for indoor use
and protected, against the users, by
double insulation per EN61010-1 and
1EC61010-1 2nd Edition (2001) to CAT
Ill 600V; Pollution Degree 2. The meter
also meets UL 61010-1, Second Edition
(2004), CAN/CSA C22.2 No. 61010-1,
Second Edition (2004), and UL 61010B-
2-031, First Edition (2003)

UL LISTED
The UL mark does not indicate that this product has been
evaluated for the accuracy of its readings
PER IEC1010 OVERVOLTAGE INSTALLATION CATEGORY
OVERVOLTAGE CATEGORY !
Equipment of OVERVOLTAGE CATEGORY | is equipment for
connection to circuits in which measures are taken to limit the
transient overvoltages to an appropriate low level. Note —
Examples include protected electronic circuits.
OVERVOLTAGE CATEGORY II
Equipment of OVERVOLTAGE CATEGORY II is energy-
consuming equipment to be supplied from the fixed installation.
Note — Examples include household, office, and laboratory
appliances.
OVERVOLTAGE CATEGORY III
Equipment of OVERVOLTAGE CATEGORY III is equipment in
fixed installations.
Note — Examples include switches in the fixed installation and
some equipment for industrial use with permanent connection to
the fixed installation.
OVERVOLTAGE CATEGORY IV
Equipment of OVERVOLTAGE CATEGORY IV is for use at the
origin of the installation.
Note — Examples include electricity meters and primary over-
current protection equipment
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OPERATING INSTRUCTIONS
Notice: Read and understand all WARNING and CAUTION
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.
NOTES:
1. ALWAYS turn the rotary function switch to the OFF position
when the meter is not in use
2. If “OL” appears in the display during a measurement, the value
exceeds the range you have selected. Change to a higher
range
DC/AC CURRENT MEASUREMENTS
WARNING: Disconnect the test leads from the meter before
making current clamp measurements.
1. Set the Function switch to the 400ADC, 40ADC, 400AAC or
40AAC range. If the range of the measured current is not
known, select the higher range first then move to the lower
range if necessary.
2. For DC current measurement, press the ZERO key to null the
meter display.
3. Press the trigger to open jaw. Fully enclose one conductor to
be measured.
Note: Do not put more than one wire inside the current clamp.
The clamp meter LCD will display the reading. =
11

DC/AC VOLTAGE MEASUREMENTS
WARNING: Risk of Electrocution. The probe tips may not be
long enough to contact the live parts inside some 240VAC
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 DC or 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 rotary function switch to the Volts/Hz/% 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/Q/Temp) jack
Select AC or DC with the MODE button
Connect the test leads to the circuit under test
5. Read the voltage on the display. The display will indicate the
proper decimal point and value.
a
Non-Contact Voltage Detection (NCV) - “This model has a built in
NCV tester. To operate, switch dial to V-AC and hold the top
section of the clamp to the area where you would like to detect
voltage. If voltage is present, the light indicator at the top of the
Clamp meter housing will light.
WARNING: Be sure to test the NCV Detector on a known source of
AC voltage before testing. Also, when testing, if the NCV light
indicator does not light, this does not mean that Voltage is not
present. Bb cautious and re-confirm with the test leads to measure
voltage.
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RESISTANCE MEASUREMENTS
WARNING: To avoid electric shock, disconnect all power to the
unit under test, remove the batteries, unplug the line cords and
discharge all capacitors before taking any resistance
measurements.
le
2.
4.
Set the function switch to the Q + °))) CAP position.
Insert the black test lead banana plug into the negative (COM)
jack and the red test lead banana plug into the positive
(V/Q/Temp) jack
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
Read the resistance in the display
CONTINUITY CHECK
WARNING: To avoid electric shock, never measure continuity
on circuits or wires that have voltage on them.
—_
Set the function switch to the Q Pt *))) CAP position.
Push the mode button to indicate ¢))) on the display.
Insert the black lead banana plug into the negative (COM) jack
Insert the red test lead banana plug into the positive (VQ) jack.
Touch the test probe tips to the circuit or wire you wish to
check.
If the resistance is less than approximately 150Q, the audible
signal will sound. If the circuit is open, the display will indicate
Olea
13

DIODE TEST
WARNING: To avoid electric shock, do not test any diode that
has voltage on it.
1. Tur the rotary switch to the QQ -Pt *))) CAP position.
Insert the black test lead banana plug into the negative (COM)
jack and the red test lead banana plug into the positive (VQ)
jack.
3. Push the mode button to indicate >} on the display.
4. Touch the test probes to the diode under test. Typically for a
normal diode, forward voltage will indicate 0.4V to 0.7V.
Reverse voltage will indicate “OL”. Shorted devices will
indicate near OV and an open device will indicate “OL” in both
polarities.
CAPACITANCE MEASUREMENTS
WARNING: To avoid electric shock, discharge the capacitor
under test before measuring.
1. Set the function switch to the Q Pt *))) CAP position.
2. Push the mode button to indicate nF on the display.
3. Insert the black lead banana plug into the negative (COM) jack
and
insert the red test lead banana plug into the positive
(VQTemp) jack.
4. Press the ZERO key to null the meter display.
Touch the test probe tips to the capacitor you wish to check.
6. Read the capacitance value on the display.
co)
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FREQUENCY or % DUTY CYCLE MEASUREMENTS
+
2
3.
4.
5.
Turn the rotary switch to the Volts Hz % position.
Insert the black test lead banana plug into the negative (COM)
jack and the red test lead banana plug into the positive (VQ)
jack.
Select Hz or % with the HZ/% button.
Touch the test probe tips to the circuit under test.
Read the frequency on the display.
TEMPERATURE MEASUREMENTS
WARNING: To avoid electric shock, disconnect both test
probes from any source of voltage before making a
temperature measurement.
Turn the rotary switch to the Temp position.
Insert the Temperature Probe into the negative (COM) and the
(VQTemp) jacks, making sure to observe correct polarity.
Select °C or °F with the MODE button.
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.
Read the temperature on the display.
Warning: To avoid electrical shock, be sure the thermocouple
has been removed before changing to another measurement
function.
15

AUTO POWER OFF
To extend the battery life, the meter will enter the sleep mode after
30 minutes of continuous use. Turn the function switch to the OFF
position to shut the meter OFF and then to the needed function to
resume operation.
AUTO/MANUAL RANGING
The meter turns on in Autoranging mode. Press the RANGE button
to enter 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 mode. Note: Manual ranging does not
function in AC Current or Diode and Continuity check functions. In
Temperature function, it will change the resolution from 0.1° to 1°.
DATA HOLD
To freeze the LCD meter reading, press the HOLD button. While
data hold is active, the HOLD display icon appears on the LCD.
Press the HOLD button again to return to normal operation.
BACKLIGHT
Press and hold the HOLD button for >2 seconds to turn the
backlight on/off.Note: The HOLD feature will activate when the
backlight is turned on. Press the HOLD button again to exit the
Hold feature.
MODE
To switch the meter from DC and AC Voltage, press the MODE
button. Also, to switch the meter setting from Ohm’s to
Diode/Continuity Check press the MODE button. to switch the
meter setting from °F to ‘C Check press the MODE button.
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REL
The relative button allows the user to store a measurement, then
make additional measurements in comparison. To use, first that
the measurement that you want to use as a reference. Press the
relative button to store. Now, when taking additional
measurements, each additional reading will show the difference
between the stored measurement and the new measurement. To
escape the relative mode, either turn off the meter or press the
relative button for 2 seconds while the relative measurement is
erased.
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MAINTENANCE
WARNING: To avoid electric shock, do not operate your meter
until all covers are in place and fastened securely.
This meter is designed to provide years of dependable service, if
the following care instructions are performed:
1. KEEP THE METER DRY. If it gets wet, wipe it off.
2. USE AND STORE THE METER IN NORMAL
TEMPERATURES. Temperature extremes can shorten the life
of the electronic parts and distort or melt plastic parts.
3. HANDLE THE METER GENTLY AND CAREFULLY. Dropping
it can damage the electronic parts or the case.
4. KEEP THE METER CLEAN. Wipe the case occasionally with a
damp cloth. DO NOT use chemicals, cleaning solvents, or
detergents.
REPLACING THE BATTERIES
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the battery door.
1. When the batteries become exhausted or drop below the
operating voltage, the low battery indicator will appear in the
LCD display. The batteries should then be replaced.
2. Disconnect the test leads from the meter.
3. Open the battery door by removing the rear screws using a
Phillips head screwdriver.
4. Insert the batteries into battery holder.
Put the battery door back in place. Secure with the screws.
On . Dispose of the old batteries properly.
WARNING: To avoid electric shock, do not operate the meter
until the battery door is in place and fastened securely.
NOTE: If your meter does not work properly, check the battery
ensuring that it is still good and properly inserted.
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TROUBLESHOOTING
There may be times when your meter does not operate properly.
When this occurs, check the following:
Meter Does Not Operate
1. Review all the instructions in this manual.
2. Check to be sure the battery is properly installed.
3. Check to be sure the battery is good.
4. If the battery is good and the meter still does not operate, check
to be sure that both ends of the fuse are properly installed.
If You Need Assistance Understanding How the Meter Works
Call our Customer Service Line 1-800-906-6002.
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