Inhaltsverzeichnis
Werbung
This instrument has been designed to meet the requirements of the EMC Directive 2004/108/EC.
Compliance was demonstrated by meeting the test limits of the following standards:
Emissions
EN61326 (1998) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use. Test limits used were:
a)
Radiated : Class B
b)
Conducted : Class B
c)
Harmonics: EN61000-3-2 (2000) Class A; the instrument is Class A by product category.
Immunity
EN61326 (1998) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use.
Test methods, limits and performance achieved were:
a)
EN61000-4-2 (1995) Electrostatic Discharge : 4kV air, 4kV contact, Performance A.
b)
EN61000-4-3 (1997) Electromagnetic Field, 3V/m, 80% AM at 1kHz, Performance B.
c)
EN61000-4-11 (1994) Voltage Interrupt, 1 cycle, 100%, Performance B.
d)
EN61000-4-4 (1995) Fast Transient, 1kV peak (AC line), 0.5kV peak (DC Outputs),
Performance B.
e)
EN61000-4-5 (1995) Surge, 0.5kV (line to line), 1kV (line to ground), Performance A.
f)
EN61000-4-6 (1996) Conducted RF, 3V, 80% AM at 1kHz (AC line only; DC Output
connections <3m not tested), Performance A.
According to EN61326 the definitions of performance criteria are:
Performance criterion A: 'During test normal performance within the specification limits.'
Performance criterion B: 'During test, temporary degradation, or loss of function or
performance which is self-recovering'.
Performance criterion C: 'During test, temporary degradation, or loss of function or
performance which requires operator intervention or system reset occurs.'
Where Performance B is stated it is because DC Output regulation may deviate beyond
Specification limits under the test conditions. However, the possible deviations are still small and
unlikely to be a problem in practice. Note that if operation in a high RF field is unavoidable it is
good practice to connect the PSU to the target system using screened leads which have been
passed (together) through an absorbing ferrite sleeve fitted close to the PSU terminals.
Cautions
To ensure continued compliance with the EMC directive observe the following precautions:
a) after opening the case for any reason ensure that all signal and ground connections are
remade correctly and that all case screws are correctly refitted and tightened.
b) In the event of part replacement becoming necessary, only use components of an identical
type, see the Service Manual.
Mains Operating Voltage
Check that the operating voltage of the instrument shown on the rear panel is suitable for the
local supply. Should it be necessary to change the operating voltage range proceed as follows:
1.
Ensure that the instrument is disconnected from the AC supply.
2.
Remove the screws holding the case upper.
3.
Lift off the case upper.
4.
Change the transformer connections following the diagrams below.
5.
Reassemble in the reverse order.
6.
Change the fuse type if necessary.
EMC
Installation
5
Werbung
Inhaltsverzeichnis
