User Manual
52 GMC-I Messtechnik GmbH
14 Special Functions – EXTRA Switch Position
Select EXTRA Switch Position 
Overview of Special Functions
Selecting Special Functions
The list of special functions is accessed by pressing the upper-
most softkey. Select the desired function with the requested icon.
Softkey Meaning / Spe-
cial Function
MBASE+
M
TECH+
M
PRO
MXTRA
SECULIFE IP
Sec-
tion / 
Page
Voltage drop 
measurement 
ΔU function
✓
✓✓✓✓
sec-
tion 
14.1 
page 
53
Standing sur-
face insulation 
impedance 
Z
ST
 function
✓
✓✓✓✓
sec-
tion 
14.2 
page 
54
Meter start-up 
test
kWh function
✓
✓✓✓
—
sec-
tion 
14.3 
page 
55
Leakage Cur-
rent Measure-
ment 
I
L
 function
———
✓✓
sec-
tion 
14.4 
page 
56
Check insula-
tion monitoring 
device
IMD function
———
✓✓
sec-
tion 
14.5 
page 
57
Residual volt-
age test 
Ures function
———
✓
—
sec-
tion 
14.6 
page 
59
Intelligent ramp
ta + IΔ function
———
✓
—
sec-
tion 
14.7 
page 
60
Residual cur-
rent monitor 
(RCM)
RCM function
———
✓
—
sec-
tion 
14.8 
page 
61
Testing the op-
erating states 
of electric vehi-
cles at charging 
stations per 
IEC 61851
—
✓
—
✓
—
sec-
tion 
14.9 
page 
62
Report genera-
tion of fault 
simulations on 
PRCDs with 
PROFITEST 
PRCD adapter
———
✓
—
sec-
tion 
14.10 
page 
63
EXTRA










