HT instruments EQUITEST5071 - Manual (Page 24)

EQUITEST 5071
EN - 22
6.4.1. High-resolution impedance measurement (0.1 m
)
The instrument allows measuring impedance with a high resolution next to a MT/BT
transformer by using the optional accessory IMP57. Measurement is selectable in modes
LOOP P-P, P-N, P-PE by means of the F2 key (Z2
). In case high-resolution impedance
measurement is selected with no connection of the accessory IMP57, the instrument shows a
screen similar to the following one (e.g.: Loop P-N):
LOOP 30.11.12
Z=-----

R=-----
 X=-----
IkSTD=----A
V1-2= 0V FRQ= 0.0Hz
NO IMP57
P-N Z2

FUNC ZSTD ICAL RMT
For any detail regarding the use and the technical specifications of accessory IMP57,
please refer to the relevant user manual or visit the website www.ht-instruments.com.
6.4.2. "P-N" mode: measurement procedure and results
1. Select the P-N mode using the F1 key.
2. Insert the 3 Black, Green, Blue connectors of the three-pin shuko cable or of the separate
cables into the relevant instrument input terminals B1, B3, B4 (see Fig. 7, Fig. 8). In case
separate cables are used, insert alligator clips on the free cable ends.
Fig. 7: Connection for measuring Loop
impedance of single-phase/two-phase
230V system
Fig. 8: Connection for measuring Loop
impedance of three-phase 400V system
3. Insert the Shuko plug into a 230V 50Hz socket or the alligator clips onto the conductors
of the three-phase system (see Fig. 7, Fig. 8)
4. When possible, disconnect all loads connected downstreams of the measuring point since
the impedance of these users may alter test results.
5. Press the START key. The instrument carries out the test.