RETURN TO HOME PAGE
BROADBAND UNTERMINATED CURRENT TRANSFORMER DATA
These transformers can provide an economical alternative to the broadband terminated transformers
where a frequency response significantly above 2MHz is not required

Unterminated-current-transformer

All models available with terminal or flying lead output, with and without mounting feet.
A screened secondary winding may be specified

Unterminated-current-transformer
ID
minimum
mm

typical
mm

W
typical
mm
H
typical
mm
Screened secondary
14
50
25
60
Unscreened secondary
17
47
23
55
 
 

TYPICAL VALUES

Rectangular pulse

Sinewave

 

Screen,
leads,
feet

Secondary
resistor

Output

Droop

Rise
time

I-t

3dB bandwidth

Ipeak/f

DC saturation
current.

Max rms
current

Peak
current

Price

 

 

 

 

 

 

lf

hf

 

Isat

 

 

 

 

Ohm

V/A

%/ms

ns

mA s

Hz

MHz

A/Hz

A

Irms, A

Ipeak, A

GBP

Note
1
2
3
4
5
Model                          
K2108
Y,N,Y
5
0.025
0.8
200
400
1.5
2
2.7
3
50
5000
78.00
20
0.1
2.2
200
140
5
2
0.8
50
0.25
5
200
60
10
2
0.4
K2125
N,Y,N
5
0.01
0.06
800
1600
0.1
0.5
10
0.8
200
10,000
57.00
50
0.1
0.25
800
350
0.5
0.5
2.3
K2136
N,Y,N
5
0.01
2
800
1200
3
0.5
8
18
200
10,000
63.00
50
0.1
10
800
250
15
0.5
1.5
Notes
1. Resistor should be non-inductive and selected to carry secondary rms and pulse currents.
2. The sensitivity is determined from the relationship Output = Secondary resistor/ratio.   The ratio may be deduced from the resistor values and sensitivities in the data table.   Current ratio accuracy +/-0.5% at log mid frequency point. +/-2% within one decade of 3dB cut-off points
3. I-t capability may be improved up to 80% by applying a dc offset current equal to Isat. See “Characteristics” section
4. High frequency properties achieved when secondary resistor is connected to a 50R cable via a resistor designed to make the source resistor equal to 50R. A 50R terminating resistor is employed at the receiver.
5. Small quantity price

Other Models:

The table describes a small selection from the possible designs of unterminated broadband current transformers.   The range can be extended to cover: ID 5mm to 100mm; sensitivity to 5V/A; droop to <0.01%/ms; I-t to >20,000mA s; lf cut-off to <0.01Hz and hf cut-off to 5MHz.   Contact Lilco Ltd or complete the enquiry form for further information on this range.
TOP OF PAGE
RETURN TO HOME PAGE