Fluke 320 Series, 330 Series Technical Data

Fluke 320 and 330 Series
Clamp Meters

Technical Data

Narrow body and jaw fit into small spaces

•

Backlight available on most models

•

Accurate low current measurements

•

Inrush current feature on most models

•

Auto shut-off

•

New Inrush Feature

A new innovation from Fluke! Fluke Clamp Meters
with the inrush feature measure motor starting
current like a circuit breaker or overload unit sees

. One button lets you troubleshoot current surges

it
that can cause nuisance tripping. Fluke’s inrush
feature gives you a synchronized reading of the
current draw profile from motor start up

or more information ab

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feature go to www

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.fluke.com/330 to view

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’s new inrush

Choose the model
that fits your work.

Looking for a clamp meter that’s right
for you? Match the functions and
features listed below to the Fluke
Clamp Meter best suited for your job.

321 322

AC Amps AC Amps A
Ohms Ohms
AC Volts AC Volts A
Auto-Off Auto-Off
Hold Hold
Compact Compact

DC Volts

Measure ac current 400.0 A

Measure ac voltage

Measure continuity ≤ 30 Ω≤30 Ω

Measure dc voltage

Higher resolution for loads below 40 amperes

Measure resistance 400.0 Ω 400.0 Ω
Measure inrush
Work in poorly lit areas
Measure non-linear loads
Measure dc current
Variable speed drives and stand-by power

400.0 V 400.0 V
600 V 600 V

40.00 A

400.0 A

400.0 V
600 V

0 - 40.00A

40.0 - 400.0A

333 334 335 336 337

AC Amps AC Amps AC Amps AC Amps AC Amps
Ohms Ohms Ohms Ohms Ohms
AC Volts AC Volts AC Volts AC Volts AC Volts
Auto-Off Auto-Off Auto-Off Auto-Off Auto-Off
Hold Hold Hold Hold Hold
Full Size Full Size Full Size Full Size Full Size
DC Volts DC Volts DC Volts DC Volts DC Volts

In-rush In-rush In-rush In-rush
Backlight Backlight Backlight Backlight

True-rms True-rms True-rms

DC Amps DC Amps

Frequency
Large Jaw
MIN/MAX

400.0 A 600.0 A 600.0 A 600.0 A 999.9 A

600.0 V 600.0 V 600.0 V 600.0 V 600.0 V

≤ 30 Ω≤30 Ω≤30 Ω≤30 Ω≤30 Ω

600.0 V 600.0 V 600.0 V 600.0 V 600.0 V

600.0 Ω 6000 Ω 6000 Ω 6000 Ω 6000 Ω
100 mS 100 mS 100 mS 100 mS
Backlight Backlight Backlight Backlight

True-rms True-rms True-rms

600.0 A 999.9 A

400.0 Hz

600V

CAT III

Designed and 
Conforms to

IEC 1010-2-031

Specifications (@23 ºC + 5 ºC RH 0 - 90%)

Fluke 321 Fluke 322 Fluke 333 Fluke 334 Fluke 335 Fluke 336 Fluke 337

Range 0 - 400.0 A 0 - 40.00 A 0 - 400.0 A 0 - 600.0 A 0 - 600.0 A 0 - 600.0 A 0 - 999.9 A

Accuracy 1.8% ± 5 counts 1.8% ± 5 counts 2% ± 5 counts 2% ± 5 counts 2% ± 5 counts 2% ± 5 counts 2% ± 5 counts

(50 - 60 Hz) (50 - 60 Hz) (50 - 60 Hz) (50 - 60 Hz) (50 - 60 Hz) (10 - 100 Hz) (10 - 100 Hz)

3.0% ± 5 counts 3.0% ± 5 counts 6% ± 5 counts 6% ± 5 counts
(60 Hz - 400 Hz) (60 Hz - 400 Hz) (100 - 400 Hz) (100 - 400 Hz)

Crest Factor — — — — 2.4 @ 500 A 3 @ 500 A 3 @ 500 A
(50/60 Hz) 2.0 @ 600 A 2.5 @ 600 A 2.5 @ 600 A

AC Response Averaging Averaging Averaging Averaging True-rms True-rms True-rms

Inrush Integration Time — — — 100 mS 100 mS 100 mS 100 mS

Range — — — — — 0 - 600.0 A 0 - 999.9 A
Accuracy — — — — — 2% + 3 counts 2% + 3 counts
Range 0 - 400.0 V 0 - 400.0 V 0 - 600.0 V 0 - 600.0 V 0 - 600.0 V 0 - 600.0 V 0 - 600.0 V

0 - 600 V 0 - 600 V

Accuracy 1.2% + 5 counts 1.2% + 5 counts 1% + 5 counts 1% + 5 counts 1% + 5 counts 1% + 5 counts 1% + 5 counts

(50 - 400 Hz) (50 - 400 Hz) (50/60 Hz) (50/60 Hz) (50/60 Hz) (20 - 100 Hz) (20 - 100 Hz)

AC Response Averaging Averaging Averaging Averaging True-rms True-rms True-rms
Range — 0 - 400.0 V 0 - 600.0 V 0 - 600.0 V 0 - 600.0 V 0 - 600.0 V 0 - 600.0 V

Accuracy — 1% + 5 counts 1% + 5 counts 1% + 5 counts 1% + 5 counts 1% + 5 counts 1% + 5 counts
Range 0 - 400.0 Ω 0 - 400.0 Ω 0 - 600.0 Ω 0 - 600.0 Ω 0 - 600.0 Ω 0 - 600.0 Ω 0 - 600.0 Ω

Accuracy 1% ± 5 counts 1% ± 5 counts 1.5% ± 5 counts 1.5% ± 5 counts 1.5% ± 5 counts 1.5% ± 5 counts 1.5% ± 5 counts

Continuity ≤ 30 Ω≤30 Ω≤30 Ω≤30 Ω≤30 Ω≤30 Ω≤30 Ω

Range — — – — — — 5.0 - 400.0 Hz
Accuracy — — — — — — 0.5% ± 5 counts
Trigger Level — — — — — — 10 - 100 Hz ≥ 5 A

MIN/MAX NoNoNoNoNoNoYes

Backlight No No No No Yes Yes Yes

Display Hold Yes Yes Yes Yes Yes Yes Yes

Height 7.5” 7.5” 9.375” 9.375” 9.375” 9.875” 9.875”

Size Width 2.5” 2.5” 3.125” 3.125” 3.125” 3.125” 3.125”

Depth 1.4” 1.4” 1.625” 1.625” 1.625” 1.625” 1.625”
Jaw Opening 1” (25.4 mm) 1” (25.4 mm) 1.2” (30.5 mm) 1.2” (30.5 mm) 1.2” (30.5 mm) 1.2” (30.5 mm) 1.2” (30.5 mm)

Max. Wire Size 500 MCM 500 MCM 750 MCM 750 MCM 750 MCM 750 MCM or 750 MCM or

Weight 8 oz. 8 oz. 11 oz. 11 oz. 11 oz. 11 oz. 11 oz.

40.0 - 400.0 A

0 - 600 V

add 2% for C.F.>2 add 2% for C.F.>2 1.42 @ 1000 A

6% + 5 counts 6% + 5 counts
(100 - 400 Hz) (100 - 400 Hz)

601 - 6000 Ω 601 - 6000 Ω 601 - 6000 Ω 601 - 6000 Ω

two 500 MCM two 500 MCM

add 2% for C.F.>2

5 - 10 Hz,

100 - 400 Hz ≥ 10 A

Models 321 and 322

Operating temperature

-14 °F to 122 °F
(-10 °C to 50 °C)

Altitude

2,000 meters

Battery life

(2) AAA carbon zinc approxi­mately 100 hours continuous,
automatic low battery indicator

Safety rating

IEC 1010-2-031, 600 V CAT III

Temperature de-rating

< 18 °C, > 28 °C add 0.1 x
specified accuracy / °C

Storage temperature

-22 °F to 140 °F (-30 °C to 60 °C)

Warranty

Two years

Models 333, 334, 335,
336 and 337

Operating temperature

-14 °F to 122 °F
(-10 °C to 50 °C)

Altitude

2,500 meters

Battery life

(2) AA alkaline approximately
150 hours continuous, auto­matic low battery indicator

Safety rating

IEC 1010-2-031, 600 V CAT III

Temperature de-rating

Add 0.1 x specified accuracy for
each ºC above 28 ºC or below
18 ºC

Storage temperature

-40 ºF to 140 ºF
(-40 ºC to 60 ºC)

Warranty

Three years

Fluke. Keeping your world

up and running.