General Specifi cations
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
Symbology
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
Classifi cation of transient overvolt-
ages, based on nominal line voltage
Cat III
to earth.
FUNCTIONAL DESCRIPTION
1
Cat. No.
2236-20
2
3
4
5
9
6
7
8
1. Current sensing jaws
7. °F/°C button (2236-20)
Hz button (2237-20)
2. NCVD indicator
3. Jaw opening trigger
8. Terminal inputs
4. Rotary Dial
9. Min/Max button
5. Display
10.Worklight LED
6. Zero button
11.Hold button
ASSEMBLY
WARNING
To avoid an electrical hazard, turn the Rotary
Dial to OFF and disconnect the test leads
before replacing batteries.
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.
4
WARNING
4
Only use MILWAUKEE test leads with the
Cat. No.
MILWAUKEE Clamp Meters.
2237-20
Inspect test leads before each use. Use
clamp meter to run a continuity test.
Before Use
Confi rm the Rotary Dial is set to the correct position,
11
the instrument is set to the correct measurement
mode, and the Data hold function is disabled. Oth-
erwise, desired measurement cannot be made.
10
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
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.
1. Set the Rotary Dial to
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.
OPERATION
CAUTION
Maximum conductor size is about 1.3" diam-
eter. During measurement, keep the jaws fully
closed to ensure accurate measurements.
DC Current (Cat. No. 2237-20 only)
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
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 appropriate 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
position.
the underside of the meter, the polarity is
positive; fl ow from underside to display side,
the polarity is negative.
AC Voltage
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.
5
position.