AC Current Clamp Meter with Broad Operating Temperature Range, Attachable Flexible Sensor, and Drop-Proof Durability

Hioki clamp meters are best-in-class measuring devices incorporating Hioki’ s expertise in current sensing technology. The 3280-10F is an average rectifying 1000A AC clamp meter that features a broad operating temperature range of -25°C to 65°C, thin and compact clamp core and optional flexible current sensor that you can attach to let you get into the tightest spots. Key Features • Measure the fundamental waveform component using the average rectified method • Expanded -25 °C to 65 °C operating temperature range • Connect the CT6280 flexible sensor to measure up to 4199 A in thick or paired wires • Drop proof design withstands drop from a height of 1 meter CAT IV 300 V (Current) CAT III 600 V (Current) CAT III 300 V (Voltage) CAT II 600 V (Voltage)

Model No. (Order Code)

3280-10F Average rectified
3280-70F 3280-10F, CT6280 bundled model

Note: The 3280-70F includes both the meter and an AC Flexible Current Sensor. 1: AC CLAMP METER 3280-10F×1 2: AC FLEXIBLE CURRENT SENSOR CT6280×1 3: CARRYING CASE C0205×1


Using 3280 series AC clamp meters: Introduction to functionality and measurement methods

In addition to AC current measurement, these clamp meters provide voltage and resistance measurement as well as continuity check functionality. Their compact size, low-profile design, and resistance to both rough handling and extreme temperatures make them essential tools for any electrician.

Using 3280 series AC clamp meters: Difference between mean value and true RMS measurement

Measurements taken with the Hioki 3280-10F (which uses the mean value method) and the the Hioki 3280-20F (which uses the true RMS method) are compared. Observe the difference between readings from these two types of instruments when measuring a distorted waveform that contains harmonic components such as those produced by inverters and switching power supplies.

A pocket clamp meter that can use flexible sensors

When connected to an optional flexible current sensor, the 3280-10F can be used to measure the current flowing in pairs of wires or in tangled or complexly routed wires around which it was not possible to apply a clamp-on sensor in the past.

Essential for electrical work: A thin card tester that fits in the pocket with all the capabilities of a clamp meter

The 3280-10F delivers all the functionality of a clamp meter and card tester in the form factor of the latter. In addition to current measurement, this single instrument delivers voltage measurement, continuity check, and resistance measurement functionality.

A tough, pocket-size clamp meter with an operating temperature range of -25°C to 65°C

The 3280-10F inherits the drop-proof durability of the previous 3280-10 (making it able to withstand being dropped onto concrete from a height of 1 m) and expands that instrument’s operating temperature range to -25°C to 65°C (from the previous 0°C to 40°C). As a result, it can be used in even harsher environments.

■ Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)

AC Current41.99 to 1000 A, 3 ranges (50 to 60 Hz, Average rectified),
Basic accuracy: ±1.5 % rdg. ±5 dgt.
DC Voltage419.9 mV to 600 V, 5 ranges, Basic accuracy: ±1.0 % rdg. ±3 dgt.
AC Voltage4.199 V to 600 V, 4 ranges (45 to 500 Hz, Average rectified),
Basic accuracy: ±1.8 % rdg. ±7 dgt.
Crest factorN/A
Resistance419.9 Ω to 41.99 MΩ, 6 ranges, Basic accuracy: ±2 % rdg. ±4 dgt.
Other functionsContinuity: Buzzer sounds at 50 Ω ±40 Ω or less, Data hold, Auto power save, Drop-proof from height of 1 meter
DisplayLCD, max. 4199 dgt., Display refresh rate: 400 ms
Environmental protectionIP40 dustproof and waterproof
Power supplyCoin type lithium battery (CR2032) ×1, Continuous use 120 hours
Core jaw dia.φ 33 mm (1.30 in)
Dimensions and mass57 mm (2.24 in) W × 175 mm (6.89 in) H × 16 mm (0.63 in) D, 100 g (3.5 oz)
AccessoriesCARRYING CASE 9398 ×1, TEST LEAD L9208 ×1, Coin type lithium battery (CR2032) ×1, Instruction manual ×1

■ CT6280 Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)

Core jaw dia.φ 130 mm (5.12 in) (Cable cross-section diameter: 5 mm (0.20 in); tip cap diameter: 7 mm (0.28 in))
AC Current419.9 A/ 4199 A, 2 ranges (±3.0 % rdg. ±5 dgt.)
Cable length800 mm (31.5 in)

Hioki offers members manuals and other technical documentation.
The documents are available for download on your myHIOKI page.


CLAMP ON HiTESTER Series Download PDF  [2MB] English
AC CLAMP METER 3280-10F, 3280-20F Download PDF  [2MB] English

User Guides

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Instruction Manual Simplified Chinese  Ver.00
Instruction Manual Traditional Chinese  Ver.00
Instruction Manual Korean  Ver.00
Instruction Manual English
Instruction Manual English
Spanish  German  French  Italian 
Instruction Manual English
Indonesian  Thai  Vietnamese 

Outline Drawings

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Technical Notes

Declaration of Conformity


Drivers, Firmware

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Usable temperature range Max.65°C Max.-25°C Download PDF  [1MB] English


Bundled Accessories


70 cm (2.30 ft) length



The C0205 is a bundled accessory for the CT6280, 3280-70F


For storing the CT6280, L9208 and main body


Attaches to the tip of the Test Lead L9207-10/DT4911, L9206, 70V DC/ 33V AC


Attaches to the tip of the L4932, L9207-10/DT4911, L9206, CAT III 300V, CAT II 600V


Includes C0205 and attachment


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