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Since 1955, Pearson Electronics has been manufacturing current transformer products. Our website is designed to simplify the selection of the right current probe to fit your application. Our current sensors feature pulse-current monitoring down to less than 1ns, making these high frequency current transformers ideal for a world of applications
 

Wideband Current Monitors


Wide Band Current Monitors

 

wide band current transformers

  

Data

 

Selection Guide


Whether you are interested in observing and measuring submilliamp currents in a charged particle beam or thousands of amps resulting from a fault in a major power feeder, you will find a Pearson current monitor to suit your needs.

The use of our patented distributed termination technique permits pulse-current monitoring of rise times as short as two nanoseconds. Our current sensor devices of larger inner diameter make possible high voltage current measurement without the risk of voltage breakdown.

Several of our current transformer models feature double shielding for greater noise immunity and increased safety in high voltage applications. All models are sealed and are suitable for use in high voltage insulating oil or under vacuum.

They can be connected to oscilloscopes, spectrum analyzers, power analyzers, digital voltmeters, analog-to-digital convertors, and a variety of other measuring instruments.


Model
(click for spec)

Shape
(see below table)

Output
(volts/
amp)

Hole ID
(inches)

Time Domain Parameters

Frequency Domain Parameters

Max.
Peak
Curr.
(amps)

Droop
(%/msec.)

Useable Rise
Time
(nsec.)

IT Max.
(amp-sec.)

Max.
RMS
Curr.
(amps)

3dB pt.
Low

(Hz)

3dB
pt. High

(MHz)

I/f
(peak
amps
/Hz)

2877

F

1.0

0.25

100

200

2

0.0004**

2.5

300

200

0.0025

4100

E

1.0

0.5

500

90

10

0.002**

5

140

35

0.006

2100

D

1.0

2.0

500

80

20

0.005**

7.5

125

20

0.017

6585

K

1.0

2.0

500

300

1.5

0.002**

10

400

250

0.008

6656

J

1.0

3.5

500

140

3.5

0.01**

10

200

120

0.04

3100*

C

1.0

3.5

500

40

50

0.03**

12

40

7

0.1

150

D

0.5

2.0

1,000

20

20

0.02**

15

40

20

0.07

6595

K

0.5

2.0

1,000

100

2.5

0.008**

20

100

200

0.03

325*

C

0.25

3.5

2,000

100

30

0.09

60

160

10

0.6

2878

F

0.1

0.25

400

20

5

0.004**

10

30

70

0.025

410

E

0.1

0.5

5,000

60

20

0.25

50

120

20

1.7

411

E

0.1

0.5

5,000

0.9

20

0.2**

50

1

20

0.6

3972

I

0.1

1.0

5000

1

20

0.2

50

1

20

0.6

110

D

0.1

2.0

5,000

0.8

20

0.5**

65

1

20

1.5

110A†

D

0.1

2.0

10,000

0.8

20

0.5**

65

1

20

1.5

6600

K

0.1

2.0

2,000

15

5

0.04**

40

25

120

0.12

310*

C

0.1

3.5

5,000

20

40

0.6

140

40

10

3.6

1010*

A

0.1

10.75

5,000

250

50

0.7**

120

400

7

4.4

1025

D

0.025

2.0

20,000

100

100

0.5

100

160

4

3.0

3025*

C

0.025

3.5

20,000

4

100

3.0

325

7

4

20.0

2879

F

0.01

0.25

2,000

2

20

0.04**

25

3

20

0.25

5046

E

0.01

0.5

25,000

0.3

20

0.5**

100

0.5

20

3.0

101

D

0.01

2.0

50,000

0.1

100

2.5**

200

0.25

4

12.0

4997

D

0.01

2.0

20,000

0.3

25

1.0**

150

0.5

15

3.5

301X*

C

0.01

3.5

50,000

3

200

22.0

400

5

2

140.0

1080*†

C

0.005

3.5

200,000

2.0

250

25

750

3.0

1.5

150

1330*

C

0.005

3.5

100,000

1.0

250

65

1400

0.9

1.5

400

4418

D

0.001

2.0

200,000

0.05

200

6.0**

400

0.7

2

40

1423*

C

0.001

3.5

500,000

0.7

500

75

2500

1.0

1.2

450

2093*

B

0.001

4.75

500,000

0.09

2000

1200

2500

0.15

0.2

7500


Current Monitor Sizes
Pearson Current Monitor small sizes

Accuracy +1%, -0% of initial pulse amplitude for all models, with a high impedance load such as 1 megohm in parallel with 20 pF. A 50 ohm termination will reduce the output to half.

     *     are double shielded and are recommended for high voltage or high noise environments. The entries labeled
     **   may need a small dc bias current through the secondary for maximum current-time rating.
     †    Type N Connector

 

 

Pearson Clamp On Current Monitors



Clamp-on Current Monitors

Pearson Clamp On Current Monitor




Accuracy ±1% or better, initial pulse response for all models, with a high impedance load such as 1 megOhm in parallel with 20 pF.

A 50 Ohm termination will reduce the output to half. All models listed below come with a BNC connector except as noted and are to be used with a 50 Ohm coaxial cable.

The current monitor case is conductive and not insulated. Adequate insulation must be provided on the conductor being monitored.

To avoid electrical shock, do not mount or remove the current monitor from a live conductor.


Data


Installation





Model #

 


Shape



Output
(Volts/
Amp)




Hole Id.
(inches)

Time Domain Parameters

Frequency Domain Parameters


Peak
Curr.

(Amps)



Droop
(%/µsec.)

Useable
Rise
Time

(nsec.)



IT Max.
(Amp-sec.)

Max.
RMS
Curr.

(Amps)

3dB
pt.
Low

(Hz)

3dB
pt.
High

(MHz)

I/f
(RMS
Amps
/Hz)

I2t max
(Amps
squared
 sec)

8585C

N

1.0

0.5

500

1.0

2

0.003

5

1,500

200

0.01

5

4100C

N

1.0

0.5

500

1.0

15

0.0015

5

1,500

25

0.008

150

8590C

M

1.0

1.0

500

0.7

2.5

0.002

5

1,000

150

0.01

25

7790

M

1.0

1.0

500

1.0

15

0.002

5

1,500

25

0.01

150

4688

L

1.0

2.0

500

0.4

12

0.005

15

600

30

0.03

150

8705C†

-

1.0

2.0

15

4.0

1

.0006

4

1,500

400

.002

.02

7805

K

1.0

4.0

500

0.7

25

0.004

15

1,000

25

0.02

150

7760

J

1.0

6.0

500

0.5

50

0.005

20

750

7.0

0.03

350

5101

L

0.5

2.0

1,000

0.1

20

0.02

25

150

18

0.08

700

5949†

K

0.5

4.0

1,000

0.1

30

0.02

30

150

12

0.08

700

411C

N

0.1

0.5

5,000

0.015

20

0.15

50

25

20

0.7

18,000

7795

M

0.1

1.0

5,000

0.015

25

0.15

60

25

15

0.8

18,000

3525

L

0.1

2.0

5,000

0.004

25

0.5

100

6.0

15

2.5

18,000

7810

K

0.1

4.0

5,000

0.007

50

0.4

150

10

7.0

2.0

18,000

7655

J

0.1

6.0

5,000

0.007

100

0.4

175

10

4.0

2.0

35,000

5008C

N

0.01

0.5

50,000

0.005

150

1.0

150

7.5

3.0

4.2

250,000

7800

M

0.01

1.0

50,000

0.003

175

0.8

125

5.0

2.0

4.0

140,000

4160

L

0.01

2.0

50,000

0.001

200

2.5

300

1.5

2.0

15.0

1,000,000

7815

K

0.01

4.0

50,000

0.001

200

3.0

400

1.5

2.0

15.0

2,000,000

7450

J

0.01

6.0

50,000

0.001

250

3.0

400

1.5

1.5

12

2,000,000

5664

L

0.001

2.0

200,000

0.00025

250

8.0

500

0.4

1.5

50

1,000,000



Pearson Clamp On Current Clamp Sizes

Accuracy ±1%, initial pulse response for all models unless otherwise stated, with a high impedance load such as 1 megOhm in parallel with 20 pF. A 50 Ohm termination will reduce the output to half.  

>Droop:   For a flat top current pulse, the output voltage decays toward zero. Initially, the decay appears linear and the slope is referred to as the droop rate. 

Usable Rise Time: If the 10 to 90% rise time is greater than the specified usable rise time, initial overshoot will be less than 10% of the pulse amplitude.

† =  Type N Connector  

 

Pearson Custom Current Monitors

 

 Custom Current Monitors
 

 

 

Pearson Custom Current Clamps

 

Data

 

 

 

Accuracy ±1% or better, initial pulse response for all models, with a high impedance load such as 1 megOhm in parallel with 20 pF.

A 50 Ohm termination will reduce the output to half. All models listed below come with a BNC connector except as noted and are to be used with a 50 Ohm coaxial cable.

The current monitor case is conductive and not insulated. Adequate insulation must be provided on the conductor being monitored.

To avoid electrical shock, do not mount or remove the current monitor from a live conductor.
STANDARD MODELS





Model #



Output
(Volts/
Amp)




Hole Id.
(inches)

Time Domain Parameters

Frequency Domain Parameters


Peak
Curr.

(Amps)



Droop
(%/msec.)

Useable
Rise
Time

(nsec.)



IT Max.
(Amp-sec.)

Max.
RMS
Curr.

(Amps)

3dB
pt.
Low

(Hz)

3dB
pt.
High

(MHz)

I/f
(peak
Amps
/Hz)

10

2.0

50

700

150

0.0005

4

1,000

3

0.004

10

2.0

50

300

350

0.001

4

500

1

0.006

10

2.0

10

35,000

3

0.00005

1

45,000

125

0.00007

1

5.0

500

40

15

0.04

5

30

20

3.5

1

10.75

500

500

40

0.006

35

750

9

0.003

1

1.0

500

80

15

0.002

5

125

20

0.014

1

2.0

500

4

400

0.1

40

6

1

0.6

1

Coaxial

100

200

2

0.0004

2.5

300

200

0.0025

1

3.5

500

3

350

0.25

75

4

1

1.5

0.1

2.0

5,000

50

20

0.5

75

30

20

3.5

0.1

2.0

5,000

12

20

0.6

75

20

20

3.5

0.1

4.0

5,000

1.5

40

0.5

140

2

10

3

0.1

5.0

5,000

90

40

1

150

120

10

7.5

0.1

15.0

1,000

50

80

1.5

250

100

4

10

0.1

10.75

5,000

1.5

50

0.4

300

2

7

5.7

0.1

0.25

400

20

5

0.004

10

30

70

0.025

0.1

2.0

5,000

100

9

0.15

100

150

40

1.1

0.1

0.25

400

7

20

0.004

10

10

20

0.025

0.05

10.75

10,000

0.5

75

3

600

1

5

21.2

0.02

0.5

1,000

1

500

6

150

1.5

0.7

40

0.01

1.0

25,000

0.3

25

0.6

120

0.5

15

4

0.01

4.0

50,000

4

60

5

400

6

7

35

0.01

2.0

50,000

3

100

4.5

200

5

4

25

0.01

10.75

50,000

4

200

12

1,000

7

2

80

0.01

2.0

20,000

9

25

2

150

12

20

12

0.01

2.0

4,000

2

5

0.2

100

5

70

1.2

0.01

0.5

50,000

6

150

2

150

10

3

12

0.01

3.5

50,000

0.02

200

30

750

0.03

2

225

0.005

4.0

100,000

2

350

20

1,500

3

1

120

0.001

3.5

500,000

0.1

300

480

2,800

1

1.2

3,060

0.001

2.0

200,000

1

200

15

400

1.5

2

90

0.001

12 x 2

100,000

0.3

500

150

1,200

0.5

0.7

1,000

0.001

14.5

500,000

1.5

300

40

3,000

3

2

250

0.001

10.75

500,000

1

400

50

2,000

2

1.5

300

0.0005

4.75

1,000,000

0.2

2,000

750

3,500

0.15

0.2

3,500

   
CLAMP-ON MODELS





Model #



Output
(Volts/
Amp)




Hole Id.
(inches)

Time Domain Parameters

Frequency Domain Parameters


Peak
Curr.

(Amps)



Droop
(%/msec.)

Useable
Rise
Time

(nsec.)



IT Max.
(Amp-sec.)

Max.
RMS
Curr.

(Amps)

3dB
pt.
Low

(Hz)

3dB
pt.
High

(MHz)

I/f
(peak
Amps
/Hz)

2

2.0

500

n/a

12

n/a

n/a

100,000

30

n/a

1

2.0

500

10

600

0.15

50

15

0.5

1.1

1

2.0

500

7,000

4

0.001

10

11,000

100

0.007

1

9.0

500

750

75

0.007

25

1,250

5

0.04

0.1

10.75

5,000

250

50

0.7

120

400

7

4.4

0.1

2.0

5,000

1,040

25

0.5

100

2,000

20

3

0.01

2.0

1,000

100

7

0.3

100

200

50

2.1

0.01

3.5

50,000

3

200

400

100

5

2

140

0.05

3.5

10,000

8

100

4

250

12

3.5

25

0.005

3.5

100,000

1.5

25

50

320

1.5

2.5

320

0.001

6.0

500,000

0.3

400

15

1,000

0.4

1

105

   
DOUBLE SHIELDED MODELS





Model #



Output
(Volts/
Amp)




Hole Id.
(inches)

Time Domain Parameters

Frequency Domain Parameters


Peak
Curr.

(Amps)



Droop
(%/msec.)

Useable
Rise
Time

(nsec.)



IT Max.
(Amp-sec.)

Max.
RMS
Curr.

(Amps)

3dB
pt.
Low

(Hz)

3dB
pt.
High

(MHz)

I/f
(peak
Amps
/Hz)

1

0.5

500

0.09

10

0.002

5

140

35

0.006

1

1.75

500

0.08

20

0.005

7.5

125

20

0.017

0.1

1.75

5000

0.8

20

0.5

100

1

20

1.7

0.1

0.5

5000

0.9

20

0.2

50

1

20

0.6

0.01

1.75

20000

0.3

20

1

150

0.5

20

3.5

0.01

0.5

50000

6

150

2

150

10

3

12

0.025

1.75

20,000

100

100

0.5

100

160

4

3

   
THIN MODELS





Model #



Output
(Volts/
Amp)




Hole Id.
(inches)

Time Domain Parameters

Frequency Domain Parameters


Peak
Curr.

(Amps)



Droop
(%/msec.)

Useable
Rise
Time

(nsec.)



IT Max.
(Amp-sec.)

Max.
RMS
Curr.

(Amps)

3dB
pt.
Low

(Hz)

3dB
pt.
High

(MHz)

I/f
(peak
Amps
/Hz)

7713-03

1

0.22

100

600

1.5

0.0002

2

1000

250

0.0014

8105-03

0.1

0.22

300

50

10

0.002

6

50

40

0.013

5974

0.1

0.5

5,000

1

20

0.15

50

2

20

0.6

8500

0.1

2.0

5,000

4

20

0.1

75

10

20

0.6

8445

0.1

2.0

5,000

4

20

0.1

75

10

20

0.6

8568

0.01

0.5

25,000

0.4

25

0.4

100

0.8

15

2.5

8532

0.01

1.0

10,000

0.5

25

0.5

100

0.7

15

3

7765

0.01

2.0

20,000

1

25

0.25

150

1

20

1

6535-03

0.005

0.22

5,000

1.5

20

0.04

30

2.5

20

0.25

   
  • Accuracy ±1%, initial pulse response for all models unless otherwise stated, with a high impedance load such as 1 megOhm in parallel with 20 pF. A 50 Ohm termination will reduce the output to half.
  • Droop: For a flat top current pulse, the output voltage decays toward zero. Initially, the decay appears linear and the slope is referred to as the droop rate.
  • Usable Rise Time: If the 10 to 90% rise time is greater than the specified usable rise time, initial overshoot will be less than 10% of the pulse amplitude.
  • †= Type N Connector

 

Pearson Accessories

Accessories

  • Attenuators:  Pearson Attenuators may be used with almost all Pearson Current Transformers, except those that do not have 50 ohm output impedance. The most popular attenuator, the model A10, has a voltage ratio of 1:10 and will reduce a CTs output voltage by a factor of 10.  All of the maximum ratings of the CT are preserved. The input and output on the Attenuator are symmetrical and are matched to 50 ohms.  BNC connectors are used.
     
  • Connector Adaptors: We maintain a small supply of adaptors for connection to BNC cables.  A list of adaptors is below:   
       - SMA to BNC adaptor for models: 2877, 2878, 2879  
       - UHF to BNC adaptor for models: 3025, 310, 325, 3100, 1010, 301X, 1330, 1423, 2093
       - N to BNC adaptor for models: 110A, 1080
     
  • Replacement banana plugs:  Available for our split clamp-on models.

 


 
  Last Updated: October 24, 2019
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An Electro Mechanical Research and Development (EMRAD) Corporation, Company
 
 

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