Manual

Gossen Metrawatt GmbH 85
19.4 Leakage Current Measurement with PRO-AB Leakage
Current Adapter as Accessory – I
L
Function
(PROFITEST MXTRA only)
Application
Measurement of touch voltage in accordance with
DIN VDE 0107, part 10, as well as continuous leakage and
patient auxiliary current per IEC 62353 (VDE 0750-1) / IEC 601-1
/ EN 60601-1, is possible using the PRO-AB leakage current
measuring adapter as an accessory with the test instrument.
As specified in the standards listed above, current values of up to
10 mA can be measured with this measuring adapter. In order to
be able to fully cover this measuring range using the measure-
ment input provided on the test instrument (2-pole current clamp
input), the measuring instrument is equipped with range switching
including transformation ratios of 10:1 and 1:1. In the 10:1 range,
voltage dividing takes place at the same ratio.
Connection and Test Setup
In order to perform the leakage current measurement, the
adapter’s measurement outputs must be plugged into the mea-
surement inputs at the left-hand side of the test instrument (2-
pole current clamp input and probe input).
Either of the leakage current measuring adapter’s inputs is con-
nected to reference earth (e.g. safe earth electrode / equipotential
bonding) via a measurement cable. The metallic housing (accessi-
ble part) of the device under test is contacted with a test probe or
alligator clip which is connected to the other input by means of a
second measurement cable.
Testing the PRO-AB Adapter
The adapter should be tested before use and at regular intervals
(see adapter operating instructions).
Measuring Procedure
Refer to the operating instructions for the PRO-AB leakage cur-
rent measuring adapter regarding performance of the measure-
ment.
Attention!
!
The test plug should be located in the storage slot during
leakage current measurement. Under no circumstances
may the test plug be connected with any system compo-
nents, including PE / ground potential (measured values
might otherwise be distorted).
The measurement can be started or stopped by pressing the ON/
START ▼ key. Leakage current measurement is a long-term mea-
surement, i.e. is continues until it’s stopped by the user. The
momentary measured value is displayed continuously during
measurement.
Note
The self-test must be deactivated in the menu (set
“TEST ON/OFF” function key to “OFF”) in order to perform a
measurement.
Always start with the large measuring range (10:1), unless there’s
no doubt that small measured values can be expected, in which
case the small measuring range can be used (1:1). The measuring
range must be selected at the measuring adapter, as well as in
the menu using the corresponding function key (RANGE). It must
be assured that the range settings at the adapter and at the test
instrument are always identical, in order to prevent any distortion
of measurement results.
Depending on the magnitude of the measured values, the range
setting can or must (in the case of overranging) be manually cor-
rected at the measuring adapter and the test instrument.
Individual limit values can be adjusted after pressing the Limits
function key. Exceeded limit values are indicated by the red limit
value LED at the test instrument.