Product Details
ST5540 Leakage Current Tester -HTI
Leakage Current HiTester

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Category:Insulation/Saftey Testing

Leak current measurement, an essential part of electrical safety (Medical-use Electrical Devices/For Standard- and Regulation-compliant)

•IEC 60601-1: (2005) 3rd Edition-compliant

•The ST5540 complies with JIS, IEC, and UL standards governing medical- and general-use electrical devices.

•Uninterrupted polarity switching function dramatically reduces cycle time.

•Support for rated currents up to 20 A gives the instrument more than adequate capability for testing products designed to comply with new standards.

•Touch panel features simple, interactive operation.

•Communications functionality and external I/O support allow automatic testing on production lines.

Note: Always use an isolation transformer when measuring leak current for medical-use electrical devices. The ST5540 does not include an isolation transformer. When measuring medical-use electrical devices, use a step-up isolation transformer or similar component operating at 110% of the rated supply voltage as the power supply for the device under test.


Measurement methods

Measurement of voltage drop across body simulated resistance points

Calculation and display of current values True rms measurement

Measurement unit floats relative to instrument ground.

Measurement modes

Leak current measurement, voltage measurement, safety conductor current measurement

Standard compliance

Medical electrical equipment: IEC 60601-1 (1988) + A2:1995, (2005, 3rd Edition), JIS T0601-1:1999

Electrical Appliances and Materials Safety Act

Measurement of touch current and protective conductor current: IEC 60990 (1999)

Electrical equipment for measurement, control, and laboratory use: IEC 61010-1 (2001)

Information technology equipment: IEC 60950-1 (2005)

Household and similar appliances: IEC 60335-1 (2001) + A1:2004 + A2:2006

Audio, video and similar electronic apparatus: IEC 60065 (2001) + A1:2005

Personnel Protection Systems for EV: UL-2231-1 (2002), UL-2231-2 (2002)

UL: UL-1492 (1996)

Electrical equipment for measurement, control, and laboratory use; current measurement circuits in damp conditions: IEC 61010-1 (2001)

Leak current measurement

Ground leak current, 3 types of contact current, 7 types of patient leak current, patient measurement current, 4 types of total patient leak current, free current measurement, 3 types of enclosure leak current

Measurement current

DC, AC (true rms, 0.1 Hz to 1 MHz), AC+DC (true rms, 0.1 Hz to 1 MHz), AC peak (15 Hz to 1 MHz)

Measurement ranges

DC / AC / AC+DC mode:50 μA/500 μA/5 mA/50 mA

AC peak mode:500 μA/1 mA/10 mA/75 mA

Measurement accuracy

(current measurement)

DC measurement: ±2.0% rdg. ±6 dgt. (typ.)

AC / AC+DC measurement: ±2.0% rdg. ±6 dgt. (15 Hz to 100 kHz, typ.)

AC peak measurement: ±2.0% rdg. ±6 dgt. (15 Hz to 10 kHz, typ.)


External I/O, medical device relay output, USB 1.1 (communications), RS-232C


110% voltage application, automatic test, data storage for 100 target devices, clock, data backup, printed output (optional), etc.

HiTESTER power supply

100/120/220/240 V AC (specify at time of order), 50/60 Hz, 30 VA rated power

Target device power supply input

100 to 240 V AC, 50/60 Hz Rated current input from terminal block: 20 A

Target device power supply output

Output from terminal block: 20 A Output from outlet: 15 A

Dimensions, mass

320 mm (12.60 in) W × 110 mm (4.33 in) H × 253 mm (9.96 in) D, 4.5 kg (158.7 oz)

Supplied accessories

TEST LEAD L2200 (for ST5540, Red ×2, Black ×1) ×1 set, ENCLOSURE PROBE 9195 ×1, Instruction manual ×1, Users manual ×1, Power cord ×3, Spare fuse for measurement line ×1

ST5540, ST5541 List of functions





Network A

(Electrical Appliances and Materials Safety Act)

Network B (Medical-use electrical devices)


Network C (IEC 60990)

Network D (UL)

Network E (General-purpose 1)

Network F (General-purpose 2)

Network G (IEC 61010-1)



Power on polarity switching function

Rated current 20 A

Function for checking for blown fuses

Frequency band switching


110% voltage output terminal (T3 terminal)


S10, S12, S13, E terminal


Product URL: ST5540

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