User Manual

46 GMC-I Messtechnik GmbH
Setting Measuring Parameters for IA
Measuring 
Parameter
Meaning
Measurement Type,
Suitable for 
DUT Connection via
Direct P1 Direct measuring method (via
test sock
et) with test probe P1
Test socket, AT3 adapter 
(AT3-I I I E, AT3-I IS, AT3-I IS32), 
AT16DI/AT32DI
Alternative P1 Equivalent leakage current mea-
suring method (via test socket)
with test pr
obe P1
Test socket
Perm. con. P1 Direct measuring method
Permanent connection
Phase angle – for direct P1 and permanent connection P1 only
0 ° or 180 ° Selectable phasing for the internal generator relative to mains phas-
ing
Polarity – for direct only P1
L/N or N/L Selection of polarity for mains voltage to the test socket
The measuring parameters of measuring ty
pe „Alternative“ U(setpoint) and fre-
quency (setpoint) are no longer included as fr
om firmware version 1.7.0. These
parameters apply to individual measurements as well as test sequences and
have to be entered in the SETUP, see section 6.2
U(set) – for alternative P1 and permanent connection P1 only
110 V, 115 V, 
220 V, 230 V, 240 V
Selection of a line voltage for synthetic test voltage
Frequency(set) – for alternative only P1
48 Hz ... 400 Hz Selection of a line frequency for synthetic test voltage
Test Sequence
➭ Prior to all leakage current measurements, please make sure
that the measurement parameters „Ref. voltage L-PE“ and
„Testingfreq. Alt“ have been correctly set in the SETUP, see
section 6.2.
➭ Set the rotary switch to the I
A
position.
➭ Connect the DUT in accordance with the selected measuring
method.
➭ Set the parameters: 
Select the Dir
ect P1 or Alternative P1 measurement type:
➭ I
n the case of direct measurement, measurement must
be performed with mains plug polarity in both direc-
tions. Select the respective polarity to this end by
pressing the NL/LN key.
➭ Start the test: press the START/STOP key.
➭ After each reconnection to the mains, and as soon as
the first test is started, a mains connection test is exe-
cuted.
➭ I
n the case of the direct measurement type P1: acknowl-
edge the warning which indicates that
line voltage will
be connected to the test socket.
➭ Contact the short-circuited applied parts with the test probe.
➭
The measured values are displayed. The measured
value recording symbol shown at the right appears.
Each time
this key is pressed, the currently displayed
measured value is saved to the buffer.
➭ S
top the test: press the START/STOP key. 
The save symbol appears (floppy disk showing the
number of measured values stored to buffer memory)
and
prompts you to save the measured values to an ID
number.
➭ Read
the measured values and compare them with the
table of permissible limit values.
➭ P
ress the ESC key in order to discard the measured
values stored to buffer memory and acknowledge by
pressing the key shown at the right.
8.7.5 Patient Leakage Current – IP
I
P
Single measurements, rotary switch level: green
Switch Position
Measure-
ment Type,
With Mains 
to Test
Socket
Measure-
ment Type,
Without
Mains 
to Test
Socket
Measuring Functions
I
P
Direct P1 I
P
Patient leakage current, RMS
I
P~
AC component
I
P=
DC component
U
LN
Test voltage 
Permanent
connection P1
Definition
Patient leakage current is the current which flows to ground or PE
from the patient ports at the running device via the patient. 
The AC and the DC component of
the current is measured.
Direct Measuring Method 
– Dir
ect measurement type P1 
– DUT mains plug (PC1) connected to test socket 
– Probe to P1 terminal
Schematic Diagram
After activating test voltage, patient leakage current is measured
at the DUT between PE (DUT mains plug) and the short-circuited
application parts.
Wiring Diagram