HT Italia HT77N AC Clampmeter for Measuring Leakage Currents 10µA to 100A

The HT77N clampmeters is designed for accurate measurement of very low values of AC currents and, therefore, they are mainly employed in detecting and and defining leakage currents in private and industrial electric systems, which typically cause RCDs’ tripping. The 50/60Hz integrated low pass filter permits the cut off of high order harmonics. Some alarm threshold are selectable of the HT77N meter with buzzer sound during measurements and sophisticated automatic backlight sensor is provided to perform correct test in dark environments. The meter is compliance to IEC/ EN 61010-1 safety standard in CAT III 300V.


  • True RMS current up to 100A.
  • 50/60Hz Low Pass filter.
  • Threshold alarm on measurements.
  • Data Hold, Auto Hold, Peak Hold.
  • Manual and Auto ranging.
  • Automatic backlight sensor.
  • Backlight.
  • Auto Power Off.
  • Maximum conductor size 40mm.

 Included Accessories

  • Soft carrying case.
  • Battery.
  • User’s manual.


HT 4020 Data SheetHT 77N Data Sheet

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SKU: HT Italia HT77N Categories: , Tags: ,

The innovative model HT Italia HT77N is a clamp meter for accurate measurements of very low AC current values. It is mainly employed in measuring leakage currents causing typical problem of RCDs accidental tripping on civil and industrial electrical installations.

The built-in 100Hz low pass filter permits to cut off harmonic components. Some alarm thresholds can be selected on HT77N with acoustic indications depending on the measured current values.

It is also provided with an automatic backlight sensor to perform testing in dark environments. The meter complies with IEC/EN61010-1 safety standards under CAT III 300V.

HT Italia HT77N Specifications

Block of readings at display Data HOLD
Automatic block of readings at display Auto HOLD (for continuous digit oscillation)
Block of peak readings Peak HOLD
Low pass filter 100Hz to erase harmonic components
Comparator with sound emission 0.25, 0.75, 3.25mA thresholds compliance to IEC60950-1
Backlight automatic detectable sensor
Mechanical specifications
Dimensions (L x W x H) 200 x 70 x 40mm
Weight (including batteries) 265g
Max conductor size 40mm
Power supply
Power supply 2×1.5V batteries type AAA LR03
Life battery about 60 hours of continuous operation
Auto Power OFF after 20 minutes of idleness
Features LCD, 4 dgt, 6000 points, bargraph, backlight and decimal point
Sampling rate 4 times/s
Over range indication “OL” message at display
Conversion mode TRMS
Climatic conditions
Reference temperature 23° ± 5°C
Operating temperature 0 – 50 °C
Operating humidity <80%RH
Storage temperature -20 to 60 °C
Storage humidity <80%RH
Reference standards
Comply with IEC/EN61010-1
Insulation double insulation
Pollution level 2
Max height of use 2000m
Installation category CAT III 300V



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