MARTINDALE ET4000 Instruction Manual page 29

Martindale ET4000 / ET4500
Voltage measurement procedure
Select the VOLTAGE TRMS

Connect the test leads to the instrument.

Connect the test leads to the wiring or socket to be tested (see Figure 5.2 and

Figure 5.3).
Store voltage measurement results, if required, by pressing the MEM key

(ET4500 only).
Measurement starts immediately after selection of the
Figure 5.4: Examples of voltage measurement in a three-phase system
Displayed results for a single phase system:
Uln .......... voltage between phase and neutral conductors
Ulpe ........ voltage between phase and protective conductors
Unpe ....... voltage between neutral and protective conductors
f ............... frequency
Displayed results for a three-phase system:
U12 .......... voltage between phases L1 and L2
U13 .......... voltage between phases L1 and L3
U23 .......... voltage between phases L2 and L3
1.2.3 ........ correct connection – clockwise rotation sequence
3.2.1 ........ incorrect connection – anticlockwise rotation sequence
f ............... frequency
Testing considerations
When only two of the three test terminals are connected to the electrical

installation under test, only the voltage indication between those two terminals is
correct.
function using the function selector switch.
VOLTAGE TRMS
29
Measurements
function.