HT Instruments IMP57 Loop/Line Impedance Meter

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Description
The HT Instruments IMP57 is a high-resolution accessory for measuring loop impedance and prospective short-circuit current (Ipsc), up to 400 kA. It operates as a "slave unit" that connects to compatible HT Instruments "master" multifunction testers via an RS-232 serial cable.

Key Features
High-resolution measurement: Generates a test current of approximately 200 A, which allows for a high measurement resolution of 0.1 mΩ. This enables accurate readings even in installations with very low impedance, such as those near MT/BT transformer cabinets.
4-wire measurement: The unit uses a 4-wire method for testing, which separates the current injection from the voltage sensing. This eliminates potential errors caused by the resistance of the test leads and ensures more accurate results.
Test capabilities: It can measure loop impedance for phase-neutral (P-N), phase-phase (P-P), and phase-earth (P-PE) connections.
Master instrument compatibility: The IMP57 is designed for use with compatible HT Instruments devices, including those from the GSC, SIRIUS, Combi, Macrotest Gx, ZG47, Fulltest3, and Speed418 series.
No internal battery: The accessory is powered directly by the system under test, so it does not require its own batteries.
No display: As a slave unit, the IMP57 does not have its own display. Test results are viewed on the master instrument it is connected to.
Compact design: The unit is housed in a robust case and is portable for on-site use.

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