Fluke 1650B [30/62] Warning

165XB

Users Manual

apx034f.eps

Figure 13. Line Impedance Display

To measure line impedance:

1. Turn the rotary switch to the

x position. The LCD indicates that the

high current loop mode is selected by displaying the o symbol.

2. Connect the red lead to the L (red) and the blue lead to the N (blue)

terminals of the tester.

3. Press 1 to select L-N.

4. Use the zero adapter to zero the test leads or the mains cord.

5. Press and hold Z for more than two seconds until the ZERO

annunciator appears.

The tester measures the lead resistance, stores the reading in memory,

and subtracts it from readings. The resistance value is saved even when

the power is turned off so it is unnecessary to repeat the operation each

time you use the tester with the same test leads or mains cord.

XW Warning

At this step, be careful not to select L-PE because a high current

loop test will take place. Any RCDs in the system will trip if you

proceed.

Note

Connect the leads in a single-phase test to the system live and

neutral. To measure line-to-line impedance in a 3-phase system,

connect the leads to 2 phases.

6. Press and release T. Wait for the test to complete.

• The primary (upper) display shows the line impedance.

• The secondary (lower) display shows the Prospective Short Circuit

Current (PSC).

7. If the mains is too noisy, Err 5 will be displayed. (The measured value

accuracy is degraded by the noise). Press the down arrow U to display