RF Power and Control Line Filters

Due to the nature of the EMC chamber, all conductors passing through the shield need to do so in a controlled manner to ensure that conducted and radiated emissions do not interfere with the quiet environment/ test conditions created within the chamber. In order to achieve this any power or data cables which pass into the shielded chamber need to do so through an EMI Filter.

Generally, EMI filters consist of passive components which are connected together to form LC circuits. The LC circuits allow DC or low frequency currents to pass through, whilst ushering the higher frequency, unwanted currents down a low impedance path and into the ground/ earth connection leaving the clean/ quiet environment within.

NTD Shielding Services supply high performance filters that are ideal for this application and are designed to meet the very highest insertion loss requirement of 100dB from 10kHz to 10GHz and features an extended low frequency performance to provide considerable filter attenuation at frequencies as low as 1kHz.


Power Filters are available in both single phase and three phase as per the table below.

General Specification

Rated Voltage
Single Phase Filters

250V a.c. 50/60Hz

Also suitable for 277V a.c. 50/60Hz and 2 line d.c. supplies up to 600V d.c. (with alternative varistors if transient suppressed)

Three Phase Filters

250/440V a.c. 50/60Hz

Also suitable for 277/480V a.c. 50/60Hz (with alternative varistors if transient suppressed)

Rated Current See table below
Insertion Loss 100dB from 10kHz to >10GHz
Maximum Temperature Rise on Full Load 25oC
Ambient Temperature Range -45oC to +85oC
Maximum Full Load Heat Dissipation See table below
Operating Temperature Range on Full Load -45oC to +50oC
Maximum Volt Drop per line at Full Load d.c. 500mV
Current Discharge time to below 34V 30 seconds MAX

 


 

Single Phase (+N)

Part Number

Volt Drop (mV)

Heat Dissipation (W)

Major Dimensions (mm)

Approx Weight (kg)

A

B

C

6

NSF-6

500

8

310

175

90

8

10

NSF-10

500

11

310

175

90

8

16

NSF-16

500

15

550

205

95

16

32

NSF-32

500

25

550

205

95

18

63

NSF-63

500

52

640

205

120

22

100

NSF-100

500

60

660

475

135

60

200

NSF-200

500

120

750

500

160

75

400

NSF-400

500

160

1050

525

185

110

Three Phase (+N)

6

NTF-6

500

12

310

350

90

16

10

NTF10

500

16

310

350

90

16

16

NTF-16

500

25

550

410

95

22

32

NTF-32

500

48

550

410

95

24

63

NTF-63

500

70

660

410

135

45

100

NTF-100

500

70

660

575

150

70

200

NTF-200

500

120

750

700

170

95

400

NTF-400

500

240

1700

700

170

200

 


NTD Shielding Services also offer filters which can be used for data, control lines, ethernet and much more so don’t hesitate to get in touch with your requirement. 

For additional product information and pricing please contact NTD sales office

sales@ntdshielding.co.uk  Tel: + 44 (0) 1744 757 277