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Thank you for purchasing the Hioki 3287/3288/3288-20 AC Clamp Meter. To obtain maximum performance from the instrument, please read this manual first, and keep it handy for future reference.
3288 | Average value measurement RMS conversion model |
3287 3288-20 | True RMS measurement model |
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.
In this document, the risk seriousness and the hazard levels are classified as follows.
| 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 |
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 |
![]() | DC (direct current) |
![]() | AC (alternating current) |
We define measurement tolerances in terms of rdg. (reading) and dgt. (digit) values, with the following meanings:
rdg. (reading or displayed value) | The value currently being measured and indicated on the measuring instrument. |
dgt. (resolution) | 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-significant digit. |
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.
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.
Poor performance or damage from battery leakage could result. Observe the cautions listed below:
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Necessary tool: Phillips screwdriver and CR2032 Coin-shaped lithium battery
Do not turn the adjustment screw inside the battery case. Doing so will cause the instrument to report abnormal measured values.
Display will automatically turn off if the instrument is not used for 30 min. (Auto power-saving 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)
Indication when input exceeds the measurement range (Overflow indication)
Displays [OF] or [-OF]
Zero-adjust Function
AC Current Measurement [ ]
DC Current Measurement []
AC Voltage Measurement [ ]
DC Voltage Measurement [ ]
[ ]
[ ]
Operating environment | Indoors, pollution degree 2, altitude up to 2000 m (6562 ft.) | ||
Operating temperature and humidity | 0°C to 40°C (32°F to 104°F) 80% RH or less (no condensation) | ||
Storage temperature and humidity | −10°C to 50°C (14°F to 122°F), 80% RH or less (no condensation) | ||
Standards | Safety: EN61010 EMC: EN61326 | ||
Power supply | CR2032 Coin-shaped lithium battery ×1 (3 V DC) Maximum rated power: 15 mVA | ||
Continuous operating time | 3287: Approx. 25 hours, 3288: Approx. 60 hours, 3288-20: Approx. 35 hours (continuous, unloaded) | ||
Dimensions | Approx. 57W×180H×16D mm (2.24'W × 7.09'H × 0.63'D) | ||
Mass |
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Product warranty period | 3 years | ||
Accessories |
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Option |
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Maximum input current | 3287: 100 A AC/DC continuous (ACA/DCA) 3288, 3288-20: 1000 A AC/DC continuous (ACA/DCA) |
Maximum input voltage | 600 V AC/DC (ACV/DCV) |
Overload protection | 600 V AC/DC (ACV/DCV) 250 V AC/DC (Ω/continuity) |
Maximum rated voltage to earth |
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AC measurement method | 3288: Average value measurement RMS method 3287, 3288-20: True RMS measurement method |
Display update rate | 400 ms±25 ms |
Crest factor |
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Zero-display range | 5 counts or less (current measurement only) |
Effects of conductor position |
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Maximum measurable conductor diameter | φ35 mm or less |
Conditions of guaranteed accuracy |
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AC current measurement (ACA) | |||||||||||||
3287 | |||||||||||||
Range | Accuracy | ||||||||||||
45 Hz≤f≤66 Hz | 10 Hz≤f<20 Hz | 20 Hz≤f<45 Hz 66 Hz<f≤1 kHz | |||||||||||
10.00 A 100.00 A | ±1.5%rdg.±5dgt. | ±5.0%rdg.±5dgt. | ±2.0%rdg.±5dgt. | ||||||||||
3288 | |||||||||||||
Range | Accuracy | ||||||||||||
45 Hz≤f≤66 Hz | 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz | ||||||||||||
100.0 A 1000 A | ±1.5%rdg.±5dgt. | ±2.0%rdg.±5dgt. | |||||||||||
3288-20 | |||||||||||||
Range | Accuracy | ||||||||||||
45 Hz≤f≤66 Hz | 10 Hz≤f<45 Hz, 66 Hz<f≤500 Hz | ||||||||||||
100.0 A 1000 A | ±1.5%rdg.±5dgt. | ±2.0%rdg.±5dgt. | |||||||||||
DC current measurement (DCA) | |||||||||||||
3287 | |||||||||||||
Range | Accuracy | ||||||||||||
10.00 A 100.0 A | ±1.5%rdg.±5dgt. | ||||||||||||
3288/3288-20 | |||||||||||||
Range | Accuracy | ||||||||||||
100.0 A 1000 A | ±1.5%rdg.±5dgt. | ||||||||||||
AC voltage measurement (ACV) | |||||||||||||
Range | Accuracy guarantee range | Accuracy | Input impedance | ||||||||||
30 Hz≤f≤500 Hz | |||||||||||||
4.200 V 42.00 V 420.0 V 600 V | 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 | ±2.3%rdg.±8dgt. | 11 MΩ±5% 10 MΩ±5% 10 MΩ±5% 10 MΩ±5% | ||||||||||
DC voltage measurement (DCV) | |||||||||||||
Range | Accuracy guarantee range | Accuracy | Input impedance | ||||||||||
420.0 mV 4.200 V 42.00 V 420.0 V 600 V | 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 | ±1.3%rdg.±4dgt. | 100 MΩ or more 11 MΩ±5% 10 MΩ±5% 10 MΩ±5% 10 MΩ±5% | ||||||||||
Resistance measurement (Ω) | |||||||||||||
Range | Accuracy guarantee range | Accuracy | Open terminal voltage | ||||||||||
420.0 Ω 4.200 kΩ 42.00 kΩ 420.0 kΩ 4.200 MΩ 42.00 MΩ | 40.0 Ω to 419.9 Ω 0.400 kΩ to 4.199 kΩ 4.00 kΩ to 41.99 kΩ 40.0 kΩ to 419.9 kΩ 0.400 MΩ to 4.199 MΩ 4.00 MΩ to 41.99 MΩ | ±2.0%rdg.±4dgt. ±2.0%rdg.±4dgt. ±2.0%rdg.±4dgt. ±2.0%rdg.±4dgt. ±5.0%rdg.±4dgt. ±10.0%rdg.±4dgt. | 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 | ||||||||||
Continuity test | |||||||||||||
Range | Accuracy | Threshold level (beep sound) | Open terminal voltage | ||||||||||
420.0 Ω | ±2.0%rdg.±6dgt. | 50 Ω±40 Ω or less | 3.4 V or less |
Please visit our website at www.hioki.com for the following:
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.
CALIFORNIA, USA ONLY
Perchlorate Material - special handling may apply.
See www.dtsc.ca.gov/hazardouswaste/perchlorate
Here you can download full pdf version of manual, it may contain additional safety instructions, warranty information, FCC rules, etc.
Download Hioki 3287, 3288, 3288-20 - Clamp On Ac/Dc Hitester Manual
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