HT instruments HT77N - Manual (Page 10)

HT77N
EN - 9
4.3.2. Leakage current measurement
CAUTION
Insert the cable(s) in the middle of the clamp jaws, in order to obtain
accurate measures. Use the marks as a reference (see § 4.1.2)
Fig. 4: Measuring leakage current with direct
method in a single phase load
Fig. 5: Measuring leakage current with
indirect method in a single phase load
Fig. 6: Measuring leakage current with direct
method in a three phase load
Fig. 7: Measuring leakage current with
indirect method in a three phase load
Leakage current measurement with Direct method on earth conductors
1. Switch on the clamp by pressing the
key
2. Select the desired capacity with the Range key or keep in the Autorange mode
3. Open the clamp jaw and connect the clamp as shown in Fig. 4 or Fig. 6. The leakage
current value will be shown on the display
4. For Hold, Data Hold, Auto Hold and Peak Hold feature refer to § 4.2
Leakage current measurement with Indirect method
1. Switch on the clamp by pressing the
key
2. Select the desired capacity with the Range key or keep in the Autorange mode
3. Open the clamp jaw and connect the clamp as shown in Fig. 5 or Fig. 7. The leakage
current value will be shown on the display
4. For Hold, Data Hold, Auto Hold and Peak Hold feature refer to § 4.2