Hioki 3287, 3288, 3288-20 Instruction Manual

3287

OK

HIOKI 3287C961-02

3288

CLAMP ON
AC/DC HiTESTER

3288-20

Instruction Manual

EN

Mar. 2022 Revised edition 2
3287C961-02 22-03H

www.hioki.com/

Warranty

Warranty malfunctions occurring under conditions of normal use in
conformity with the Instruction Manual and Product Precautionary
Markings will be repaired free of charge. This warranty is valid for a
period of three (3) years from the date of purchase. Please contact
the distributor from which you purchased the product for further
information on warranty provisions.

Introduction

Thank you for purchasing the Hioki 3287/3288/3288-20 Clamp

On AC/DC HiTester. To obtain maximum performance from the
instrument, please read this manual rst, and keep it handy for future
reference.

3288 Mean value rectication RMS method
3287
3288-20

Safety Notes

This instrument is designed to conform to IEC 61010 Safety
Standards, and has been thoroughly tested for safety prior to
shipment. However, using the instrument in a way not described in
this manual may negate the provided safety features. Before using

the instrument, be certain to carefully read the following safety notes.

Notation

In this document, the risk seriousness and the hazard levels are

classied as follows.

DANGER

WARNING

CAUTION

True RMS method

Imminent risk of operator death or serious injury

Potential for operator death or serious injury

Potential for minor operator injury or device
damage or malfunction

Risk of electric shock

Prohibited actions

Actions that must be performed

Symbols afxed to the device

Precaution or hazard (See corresponding topic.)

Risk of electric shock

Protected throughout by double insulation or reinforced insulation

Device may be connected to or disconnected from a live conductor

Grounding
terminal

Accuracy

We dene measurement tolerances in terms of rdg (reading) and dgt

(digit) values, with the following meanings:

rdg

(reading or
displayed value)

dgt

(resolution)

Measurement categories

This instrument’s current measurement part conforms to the safety
requirements for CAT III 600 V and the voltage measurement part
conforms to the safety requirements for CAT II 600 V, CAT III 300 V
measuring instruments.

Distribution panel

Service entrance

Service drop

Measuring a location with a higher category number
than the measurement category indicated on this
device may result in a serious accident such as
electric shock.

To avoid electric shock, do not touch the portion
beyond the protective barrier during use.

Never apply voltage to the test leads when the
resistance and continuity functions are selected.
Doing so may damage the instrument and result in
bodily injury. To avoid electrical accidents, remove
power from the circuit before measuring.

DC (direct current)

The value currently being measured and
indicated on the measuring instrument.

The smallest displayable unit on a digital measuring
instrument, i.e., the input value that causes the digital

display to show a “1” as the least-signicant digit.

Internal wiring

CAT IV

Power meter

CAT III

Fixed Installation

DANGER

AC (alternating
current)

CAT II

Outlet

WARNING

• To avoid electric shock, short circuits and damage
to the instrument, disconnect the test leads from the
measurement object before switching the rotary switch.

• To prevent electric shock, when measuring the voltage

of a power line use a test lead that satises the

following criteria:

• Conforms to safety standards IEC61010 or EN61010

• Of measurement category III or IV

• Its rated voltage is higher than the voltage to be measured

•

The optional test leads for this instrument conform to the
safety standard EN61010. Use a test lead in accordance

with its dened measurement category and rated voltage.

• To avoid an electric shock, operate the instrument at
below a lower rated voltage between that indicated on
the instrument and on test leads.

WARNING

• Installing the instrument in inappropriate locations may
cause a malfunction of instrument or may give rise to
an accident. Avoid the following locations:

• Exposed to direct sunlight or high temperature

• Exposed to corrosive or combustible gases

• Exposed to a strong electromagnetic eld or
electrostatic charge

•

Near induction heating systems (such as high-frequency
induction heating systems and IH cooking equipment)

• Susceptible to vibration

• Exposed to water, oil, chemicals, or solvents

• Exposed to high humidity or condensation

• Exposed to high quantities of dust particles

• Since there is a risk of electric shock, check that the
insulation on the test lead are neither ripped nor torn, and
no metal conductor inside the wire are exposed before
using the instrument. If damaged, replace them with those

specied by our company.

• To prevent a short circuit accident, be sure to use the
test leads with the sleeves attached when performing
measurements in the CAT III measurement category.

• If the sleeves are inadvertently removed during
measurement, stop the measurement.

•

With regard to the electricity supply, there are risks of
electric shock, heat generation, re, and arc ash due
to short circuits. If persons unfamiliar with electricity
measuring instrument are to use the instrument, another
person familiar with such instruments must supervise
operations.

• This instrument is measured on a live line. To prevent
electric shock, use appropriate protective insulation and
adhere to applicable laws and regulations.

• Handle and dispose of batteries in accordance with
local regulations.

CAUTION

• Do not place foreign objects between the jaw tips or
insert foreign objects into the gaps of the jaws. Doing so
may worsen the performances of the sensor or interfere
with clamping action.

•

Be careful to avoid dropping the instrument or
otherwise subjecting them to mechanical shock,
which could damage the jaw and adversely affect
measurement.

Poor performance or damage from battery leakage
could result. Observe the cautions listed below:

• Do not use batteries after their recommended expiry date.

• Do not allow weak batteries to remain in the instrument.

• Replace batteries only with the specied type.

• Remove the batteries from the instrument if it is to be
stored for a long time.

• The indicator lights up when the remaining battery
capacity is low. In this case, the instrument's reliability is
not guaranteed. Replace the battery immediately.

• To avoid battery depletion, turn the rotary switch OFF
after use (the auto power save feature consumes a small
amount of current).

Inspection Before Measurement

• Verify that the instrument operates normally to ensure that no

damage occurred during storage or shipping. If you nd any

damage, contact your authorized Hioki distributor or reseller.

• If damage is suspected, check the section below before contacting
your authorized Hioki distributor or reseller.

(1) Check that the test lead is not broken.

Replace with the specied L9208 Test Lead.

(2) Check that the resistance measurement and continuity test

operates normally.

Have the instrument repaired by the your authorized Hioki
distributor or reseller. The instrument may have been subject to
a voltage of greater than 600 V during resistance measurement

or continuity testing.

(3) Check that the battery voltage is not low.

Replace the batteries.

Maintenance/Inspection

Cleaning

•

Measurements are degraded by dirt on the mating surfaces of the jaw

so keep the surfaces clean by gently wiping with a soft, dry cloth.

,

• To clean the device, wipe it gently with a soft cloth moistened with
water or mild detergent.

• Wipe the LCD display gently with a soft, dry cloth.

Insert/Replace Batteries

Necessary tool: Phillips screwdriver and CR2032 Coin-shaped lithium battery

1 2

NO

Do not turn the adjustment screw inside the battery case. Doing
so will cause the instrument to report abnormal measured values.

CALIFORNIA, USA ONLY

Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate

3

4

Functions

OK NO

OK NO

NO

OK

HIOKI 3287C961-02

Display will automatically turn off if the instrument is not used
for 30 min. (Auto power-saving function)

• The auto power save function is activated automatically when the
power is turned on. (Not possible to cancel)

• To resume instrument operation in the previous state, select the
“OFF” position with the rotary switch and then move the switch to
the desired function.

Automatically sets the measurement range to the most appropriate
range (Auto-range function)

Displays [AUTO]

To set the measurement range arbitrarily (Manual-range function)

• Power on the tester while holding down the or HOLD key to
select a manual range for measuring AC current [

], AC voltage [ ], DC voltage [ ] or resistance [ ].

• Note that this function is not available for continuity testing.
Press the

• To switch between AC voltage [
and hold the

Indication when input exceeds the measurement range (Overow indication)

Displays [OF] or [-OF]

Zero-adjust Function

• The zero adjustment function compensates for sensor magnetization
and changes in current display over time.

• Before measuring DC current [ ], you must perform zero
adjustment by simultaneously pressing the

while there is no input to the instrument.

• This function is only effective with measurement of DC current [ ].

key to step to the next range.

] and DC voltage [ ], press

key for at least one second.

], DC current [

and HOLD keys

Parts Names

Jaw

Barrier

Operation grip

LCD Display

key

HOLD key

(Press to hold the
display value.)

Rotary switch

Measurement
terminal

Test lead plug

Test leads

Sleeves

(Red)

(Black)

When attaching the L4933 or
L4934 to the L9208 Test Lead,

remove the sleeves from the

L9208 (in a CAT II state).

RearFront

115mVA

3V

RATING :
BATTERY : CR2032

MADE IN JAPAN

Battery cover

Measurement Methods

Current Measurement

AC Current Measurement [

1

2

3

]

DC Current Measurement [ ]

1

2

Perform zero adjustment by
simultaneously pressing

Voltage Measurement

AC Voltage Measurement [

]

1 2 3

DC Voltage Measurement [ ]

1

2

Black(−)

Red (+) Black(−)

Resistance Measurement [ ]

21 3 4

Continuity check [ ]

21 3 4

Specications

General Specications

Operating
environment

Operating
temperature
and humidity
Storage
temperature
and humidity
Standards Safety: EN61010

Indoors, pollution degree 2,

altitude up to 2000 m (6562 ft.)

0°C to 40°C (32°F to 104°F)
80% RH or less (no condensation)

−10°C to 50°C (14°F to 122°F),
80% RH or less (no condensation)

EMC: EN61326

3

3

Current

direction

Current direction
indicator

Red (+)

Power supply CR2032 Coin-shaped lithium battery ×1 (3 V DC)

Maximum rated power: 15 mVA

Continuous
operating time
Dimensions Approx. 57W × 180H × 16D mm

Mass • 3287: Approx. 170 g (6.0 oz.)

Product
warranty
period
Accessories • CR2032 Coin-shaped lithium battery

Option • 9209 Test Leads Holder

3287: Approx. 25 hours, 3288: Approx. 60 hours,
3288-20: Approx. 35 hours (continuous, unloaded)

(2.24″W × 7.09″H × 0.63″D)

• 3288, 3288-20: Approx. 150 g (5.3 oz.)

3 years

• 9398 Carrying Case

• L9208 Test lead

• Instruction Manual

• L4933 Contact Pin Set

(Can be connected to the tip of the L9208, which

comes with the instrument.)

• L4934 Small Alligator Clip Set

(Can be connected to the tip of the L9208, which

comes with the instrument.)

Basic Specications

Maximum input
current

Maximum input
voltage

Overload
protection
Maximum
rated voltage
to earth

AC

measurement
method
Display update
rate

Crest factor

Zero-display
range
Effects of
conductor
position
Maximum
measurable
conductor
diameter

3287: 100 A AC/DC continuous (ACA/DCA)
3288, 3288-20: 1000 A AC/DC continuous

(ACA/DCA)

600 V AC/DC (ACV/DCV)

600 V AC/DC (ACV/DCV)

250 V AC/DC (

• Jaw
600 V AC (Measurement category III),
(Anticipated transient overvoltage: 6000 V)

• Voltage measurement terminal (ACV/DCV)
600 V AC (Measurement category II),
300 V AC (Measurement category III)

(Anticipated transient overvoltage: 4000 V)

3288: Mean value rectication RMS method
3287, 3288-20: True RMS method

400 ms ±25 ms

• 3287: 2.5 max.
Current range: 150 A max., Voltage range: 1000 V max.

• 3288-20: 3 max.
Current range: 1000 A range is 2 max.,

Voltage range: 1.5 max.

5 counts or less (current measurement only)

• 3287: within ±1.0%

• 3288, 3288-20: within ±2.0%

(At all positions around the sensor’s centerpoint reference)

35 mm or less

φ

/continuity)

Ω

Accuracy Specications

Conditions of
guaranteed
accuracy

• Guaranteed accuracy period: 1 year (Number of
jaw open/close cycles: 10,000 or less)

• Guaranteed accuracy period after adjustment
made by Hioki: 1 year

• Battery warning indicator is not lighting

• Temperature and humidity for guaranteed

accuracy: 23°C ±5°C (73.0°F ±9.0°F), 80% RH or

less (no condensation)

• Temperature characteristic: 0°C to 40°C

Measurement accuracy × 0.1/°C is added

AC current measurement (ACA)

3287

Accuracy
guarantee

Range

range

10.00 A

0.10 A to 10.00 A

100.0 A

1.0 A to 100.0 A

3288/3288-20

Range

100.0 A
1000 A

DC current measurement (DCA)

Range

10.00 A

100.0 A

Range Accuracy

100.0 A
1000 A

AC voltage measurement (ACV)

Range

4.200 V

42.00 V

420.0 V

600 V

DC voltage measurement (DCV)

Range

420.0 mV

4.200 V

42.00 V

420.0 V

600 V

Resistance measurement (

Range

420.0

4.200 k

42.00 k

420.0 k

4.200 M

42.00 M

Continuity check

Range Accuracy

420.0

Accuracy
guarantee range

1.0 A to 100.0 A
10 A to 1000 A

3287

Accuracy
guarantee range

0.10 A to 10.00 A

1.0 A to 100.0 A

3288/3288-20

guarantee range

1.0 A to 100.0 A
10 A to 1000 A

Accuracy guarantee
range

0.400 V to 4.199 V

4.00 V to 41.99 V

40.0 V to 419.9 V
400 V to 600 V

Accuracy guarantee
range

40.0 mV to 419.9 mV

0.400 V to 4.199 V

4.00 V to 41.99 V

40.0 V to 419.9 V
400 V to 600 V

Accuracy
guarantee range

40.0 Ω to 419.9

Ω

0.400 kΩ to 4.199 k

Ω

4.00 kΩ to 41.99 k

Ω

40.0 kΩ to 419.9 k

Ω

0.400 MΩ to 4.199 M

Ω

4.00 MΩ to 41.99 M

Ω

±2.0% rdg ±6 dgt 50 Ω ±40 Ω or less 3.4 V or less

Ω

Accuracy

45 Hz ≤ f ≤ 66 Hz 10 Hz ≤ f < 20 Hz

±1.5% rdg ±5 dgt ±5.0% rdg ±5 dgt ±2.0% rdg ±5 dgt

Accuracy

45 Hz ≤ f ≤ 66 Hz

±1.5% rdg ±5 dgt ±2.0% rdg ±5 dgt

Accuracy

±1.5% rdg ±5 dgt

Accuracy

±1.5% rdg ±5 dgt

)

Ω

Accuracy Open terminal voltage

±2.0% rdg ±4 dgt

Ω

±2.0% rdg ±4 dgt

Ω

±2.0% rdg ±4 dgt

Ω

±2.0% rdg ±4 dgt

Ω

±5.0% rdg ±4 dgt

Ω

±10.0% rdg ±4 dgt

Ω

Threshold level
(beep sound)

Accuracy

30 Hz ≤ f ≤ 500 Hz

±2.3% rdg ±8 dgt

Accuracy

±1.3% rdg ±4 dgt

3.4 V or less

0.7 V (typ.) 3.4 V or less

0.47 V (typ.) 3.4 V or less

0.47 V (typ.) 3.4 V or less

0.47 V (typ.) 3.4 V or less

0.47 V (typ.) 3.4 V or less

20 Hz ≤ f < 45 Hz
66 Hz < f ≤ 1 kHz

10 Hz ≤ f < 45 Hz
66 Hz < f ≤ 500 Hz

Input
impedance

11 M

±5%

Ω

10 M

±5%

Ω

10 M

±5%

Ω

10 M

±5%

Ω

Input
impedance

100 MΩ or more
11 MΩ±5%
10 M

±5%

Ω

10 M

±5%

Ω

10 M

±5%

Ω

Open terminal
voltage