Craftsman 73756 User manual

Owner's Manual
AC/DC True RMS
Clamp Meter
Model No.
73756
© Sears, Roebuck and Co., Hoffman Estates, IL 60179 U.S.A.
www.craftsman.com 062006
•Safety
•Operation
•Maintenance
•Español
CAUTION: Read, understand and
follow Safety Rules and Operating
Instructions in this manual before
using this product.

2
TABLE OF CONTENTS
Warranty Page 3
Safety Instructions 4
Safety Symbols 5
Control and Jacks 6
Symbols and Annunciators 6
Specifications 7
Battery Installation 9
Operating Instructions 10
AC/DC Current Measurements 10
DC Voltage Measurements 11
AC Voltage Measurements 12
Resistance Measurements 13
Capacitance Measurements 13
Frequency Measurements 14
Temperature Measurements 15
Continuity Check 15
Diode Test 16
Data Hold 17
DC Zero 17
Peak Hold 17
Display Backlight 18
Auto Power Off 18
Maintenance 19
Battery Replacement 20
Troubleshooting 21
Service and Parts 21

3
ONE YEAR FULL WARRANTY
ONE YEAR FULL WARRANTY ON CRAFTSMAN PROFESSIONAL
AC/DC TRUE RMS Clamp Meter
If this CRAFTSMAN Professional AC/DC True RMS Clamp Meter fails to
give complete satisfaction within one year from the date of purchase,
RETURN IT TO THE NEAREST SEARS STORE OR OTHER
CRAFTSMAN OUTLET IN THE UNITED STATES, and Sears will replace
it, free of charge.
This warranty gives you specific legal rights, and you may also have
other rights which vary from state to state.
Sears, Roebuck and Co., Dept. 817WA, Hoffman Estates, IL 60179
For Customer Assistance Call 9am - 5pm (ET)
Monday through Friday 1-888-326-1006
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.

4
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
A DC or A AC 800A DC/AC
V DC or V AC 600V DC/AC
Resistance, Capacitance,
Frequency, Diode Test 250V DC/AC
Temperature 60V DC/24V AC
2. USE EXTREME CAUTION when working with high voltages
3. DO NOT measure voltage if the voltage on the "COM" input
jack exceeds 600V above earth ground
4. DO NOT measure current of circuits whose voltage is greater
than 500V 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 cover to replace the fuse or battery
7. NEVER operate the meter unless the back cover is in place
and fastened securely

5
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 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)
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.
WARNING
CAUTION
MAX
600V

6
1
2
3
4
5
6
7
P
MAX
P
MIN
CONTROLS AND JACKS
1. Current clamp
2. Clamp opening trigger
3. Control buttons:
• Data Hold
• Mode
• Peak
• Backlight
• DCA Zero
4. Backlit LCD Display
5. COM negative input jack for black test lead
6. Rotary function switch
7. V••CAP•TEMP•HZ• positive input jack for red lead
SYMBOLS AND ANNUNCIATORS
HOLD Data Hold
Minus Sign Negative reading display
0 to 3999 Measurement display digits
DC ZERO DCA Zero
PMAX PMIN Peak capture
AUTO Auto Range mode
DC/AC Direct Current/Alternating Current
BAT Low battery
mV or V Milli-volts or Volts (Voltage)
Ohms (Resistance)
A Amperes (Current)
F Farad (Capacitance)
Hz Hertz (Frequency)
oF and oC Fahrenheit and Celsius units (Temperature)
n,m,µ,M,k Unit of measure prefixes: nano,milli,micro,mega,& kilo
•))) Continuity
Diode test

7
SPECIFICATIONS
Function Range Resolution Accuracy
40.00A 0.01A ± (5% + 10d)
400.0A 0.1A ± (5% + 10d)
DC Current
(A DC)
800A 1A ± (2.8% + 10d)
40.00A 0.01A ± (5% + 10d)
400.0A 0.1A ± (5% + 10d)
AC Current
(A AC)
50/60Hz 800A 1A ± (2.8% + 10d)
400.0mV 0.1mV ± (0.8% + 10 digits)
4.000V 1mV
40.00V 10mV
400.0V 0.1V ± (1.5% + 2 digits)
DC Voltage
(V DC)
600V 1V ± (2.0% + 3 digits)
400.0mV 0.1mV ± (1.0% + 10 digits)
4.000V 1mV
40.00V 10mV
400.0V 0.1V ± (1.5% + 5 digits)
AC Voltage
(V AC)
600V 1V ± (2.0% + 5 digits)
400.00.1± (1.0% + 4 digits)
4.000k 1
40.00k 10
400.0k 0.1k± (1.5% + 2 digits)
4.000M 1k± (2.5% + 3 digits)
Resistance
40.00M
10k± (3.5% + 5 digits)
4.000nF 1pF ± (5.0% + 30 digits)
40.00nF 10pF ± (5.0% + 20 digits)
400.0nF 0.1nF
4.000µF 1nF
40.00µF 10nF ± (3.0% + 5 digits)
400.0µF 0.1µF ± (4.0% + 10 digits)
4.000mF 1µF ± (10% + 10 digits)
Capacitance
40,00mF
10µF unspecified
4.000kHz
1Hz ± (1.5% + 2 digits)Frequency
Sensitivity: 100V (<50Hz); 50V (50 to 400Hz);
5V (401 to 4000Hz)

8
Function Range Resolution Accuracy
-4 to
1400ºF 1ºF ± (3% reading + 9ºF)Temperature
-20 to
760ºC 1ºC ± (3% reading + 5ºC)
NOTE: Accuracy specifications consist of two elements:
•(% reading) – This is the accuracy of the measurement circuit.
•(+ digits) – This is the accuracy of the analog to digital
converter.
Clamp jaw opening 1.2” (30mm) approx.
Display 3-3/4 digits (4000 counts) backlit
Diode Test Test current of 0.3mA maximum,
open circuit voltage <3V DC typical
Continuity Check Audible signal will sound if the
resistance is less than 40
(approx.), test current <0.5mA
Temperature Sensor Requires type K thermocouple
Input Impedance 10M(VDC & VAC)
AC Response True rms (AAC and VAC)
ACV Bandwidth 50Hz to 400Hz
Crest Factor 3.0 in 40A and 400A ranges, 1.4 in
800A range (50/60Hz and 5% to
100% of range)
Overrange indication “OL” is displayed
Auto Power Off 25 minutes (approximately)
Polarity Automatic (no indication for
positive); Minus (-) sign for negative
Measurement Rate 2 times per second, nominal
PEAK Captures peaks>1ms
Low Battery Indication “BAT” is displayed if battery voltage
drops below operating voltage
Battery one 9 volt (NEDA 1604) battery
Operating Temperature 41oF to 104oF (5oC to 40oC)
Storage Temperature -4oF to 140oF (-20oC to 60oC)

9
Operating Humidity Max 80% up to 87oF (31oC)
decreasing linearly to 50% at 104oF
(40oC)
Storage Humidity <80%
Operating Altitude 7000ft. (2000) meters maximum
Weight 10.7 oz (303g)
Size 9.0” x 3.1” x 2.0” (229 x 80 x 49mm)
Safety For indoor use and in accordance
with the requirements for double
insulation to IEC1010-1 (2001):
EN61010-1 (2001) Overvoltage
Category III 600V and Category II
1000V, Pollution Degree 2.
BATTERY INSTALLATION
WARNING: To avoid electric shock, disconnect the test leads
from any source of voltage before removing the battery cover.
1. Disconnect the test leads from the meter.
2. Remove the rear battery cover by removing the screw using a
Phillips head screwdriver.
3. Insert the battery into battery clips, observing the correct
polarity.
4. Put the battery cover back in place and secure with the screw.
WARNING: To avoid electric shock, do not operate the meter
until the battery cover is in place and fastened securely.
NOTE: If your meter does not work properly, check the battery to
make sure that it is still good and properly inserted.

10
OPERATING INSTRUCTIONS
WARNING: Risk of electrocution. High-voltage circuits, both AC
and DC, are very dangerous and should be measured with great
care.
1. ALWAYS turn the 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.
NOTE: On some low AC and DC voltage ranges, with the test
leads not connected 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.
AC/DC Current Measurements
WARNING: Ensure that the test leads are disconnected from the meter before
making current clamp measurements.
1. Set the Function switch to
the 800A, 400A, or 40A
range. If the approx. range
of the measurement is not
known, select the highest
range then move to the
lower ranges if necessary.
2. Use the MODE button to
select AC or DC.
3. Press the DC ZERO button
to zero the meter display.
4. Press the trigger to open jaw. Fully enclose only one
conductor. For optimum results, center the conductor in the
jaw.
5. The clamp meter LCD will display the reading.
Incorrect
Correct