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OPERATION
ASSEMBLY
Symbology
General Specifi cations FUNCTIONAL DESCRIPTION
Loading/Changing the Batteries
Replace batteries when the Low Battery indicator
is displayed.
1. Turn Rotary Dial to OFF
and disconnect the test
leads.
2. Unscrew and remove
battery door.
3. Insert two (2) AA bat-
teries, according to the
polarity marked in the
battery compartment
4. Close the battery door and tighten screw se-
curely.
WARNING
To avoid an electrical hazard, turn the Rotary
Dial to OFF and disconnect the test leads
before replacing batteries.
Read Operator’s Manual
Double insulation
Risk of electric shock
Indicates that this instrument can
clamp on bare conductors when mea-
suring a voltage corresponding to the
applicable measurement category,
which is marked next to this symbol.
Earth
Danger, Warning, or Caution
Battery compartment
European Conformity Mark
Underwriters Laboratories, Inc.,
United States and Canada
Cat III
Classifi cation of transient overvolt-
ages, based on nominal line voltage
to earth.
1. Current sensing jaws
2. NCVD indicator
3. Jaw opening trigger
4. Rotary Dial
5. Display
6. Zero button
1
3
10
11
5
9
7
6
4
4
2
Cat. No.
2237-20
Cat. No.
2236-20
Accuracy is specifi ed for 1 year after calibration, at
operating temperatures of 18°C to 28°C (64°F to
82°F), with relative humidity at 0 % to 85 %.
Maximum voltage between any terminal and
earth ground .... 600 V
Jaw Opening (maximum conductor size) ....
approx. 1.3” (33 mm)
Temperature ....
Operating: -10°C to 50°C (14°F to 122°F)
Storage: -40°C to 60 °C (-40°F to 140°F)
Temperature Coefficient .... 0.1 x (specified
accuracy)/°C (<18°C or >28°C)
Operating Altitude.... 2,000 meters
Drop Test .... 1 Meter
Battery .... 2 AA, NEDA 15 A,IEC LR6
Battery Life .... Approx. 30 Hours all lights on.
Safety Compliances .... EN61010-1,
UL 61010-1, EN61010-031 (Probes),
IEC 61010-2-32 (Clamp Assemblies),
IEC/EN 61010-1 2nd Edition for measurement
Category III, 600 V,
Pollution Degree 2, EMC EN61326-1
Certifi cations .... cULus, CE
7. °F/°C button (2236-20)
Hz button (2237-20)
8. Terminal inputs
9. Min/Max button
10.Worklight LED
11.Hold button
DANGER To avoid electrical shock:
Never make measurement on a circuit
in which voltage over AC600V exists. Clamp
tips are designed not to short the circuit under
test. If equipment under test has exposed
conductive parts, however, extra precaution
should be taken to minimize the possibility of
shorting.
Do not use with the Battery Cover removed.
Disconnect the test leads from the instrument
for current measurement.
Before Use
Confi rm the Rotary Dial is set to the correct position,
the instrument is set to the correct measurement
mode, and the Data hold function is disabled. Oth-
erwise, desired measurement cannot be made.
LCD Backlight
The LCD backlight will turn off after about 3 minutes
of inactivity. Push any button or turn the rotary dial
to turn the backlight on.
Making a Measurement
AC Current
WARNING
Only use MILWAUKEE test leads with
the MILWAUKEE Clamp Meters.
Inspect test leads before each use. Use clamp
meter to run a continuity test.
1. Set the Rotary Dial to position.
AC mark is displayed.
2. Press the jaw opening trigger to
open the jaws and clamp them
onto the conductor under test.
The reading is displayed.
Cat. No. 2237-20 only: Pressing
the “Hz” Key toggles the reading
between AC Current and Hz.
NOTE: Hz Function requires 50A
or more.
NOTE: Do not clamp over 2 or
more wires at the same time.
Irregular results will occur.
DC Current (Cat. No. 2237-20 only)
CAUTION Maximum conductor size
is about 1.3" diameter. During measure-
ment, keep the jaws fully closed to ensure
accurate measurements.
DANGER To avoid electrical shock:
Never make measurement on a circuit
in which voltage over AC600V exists.
Do not use with the Battery Cover removed.
1. Set the Rotary Dial to position.
DC mark is displayed.
2. With the jaws closed and without
clamping them around a conduc-
tor, press the ZERO key to zero
adjust the display.
3. Press the jaw opening trigger to
open the jaws and clamp them
around the conductor under test.
The reading is displayed.
NOTE: Do not clamp over 2 or
more wires at the same time.
Irregular results will occur.
4. Set the Rotary Dial to an appro-
priate position according to current under test.
5. Press the ZERO key again to release the ZERO
function.
CAUTION When current fl ows from
the display side to the underside of
the meter, the polarity is positive; fl ow from
underside to display side, the polarity is
negative.
DANGER To avoid electrical shock:
Never make measurement on a circuit
in which voltage over AC600V exists.
Do not use with the Battery Cover removed.
Keep fi ngers away from jaws during mea-
surements.
AC Voltage
8
1. Set the Rotary Dial to
position.
2. Connect the red test lead
to the V terminal and the
black test lead to the COM
terminal.
3. Connect the test leads to
the circuit under test. The
reading is displayed.
Cat. No. 2237-20 only:
Pressing the Hz Key toggles
the reading between AC
Voltage and Hz. NOTE: Hz
Function requires 70V or
more.
CAUTION
Readings of frequency may fl uctuate or be
infl uenced in noisy environments.
AC