HO10-P-SP33 datasheet(10/11 Pages) LEM

Part #	HO10-P-SP33

Description	Current Transducer

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Manufacturer	LEM [LEM]

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12February2014/Version 1

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice

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HO-P/SP33 SERIES

Figure 2: Current cycle used to measure magnetic and

electrical offset

(transducer supplied)

Electrical offset

The electrical offset V

OE can either be measured when

the ferro-magnetic parts of the transducer are:

● completely demagnetized, which is difficult to realize,

● or in a known magnetization state, like in the current

cycle shown in figure 2.

Using the current cycle shown in figure 18, the electrical

offset is:

Note: the transducer has to be demagnetized prior to

the application of the current cycle (for example with a

demagnetization tunnel).

Overall accuracy

The overall accuracy at 25 °C X

G is the error in the - IPN .. +

I

PN range, relative to the rated value IPN.

It includes:

● the electrical offset V

OE

● the sensitivity error ε

G

● the linearity error ε

L (to IPN) (%)

Response and reaction times

The response time t

r and the reaction time tra are shown in

figure 18.

Both depend on the primary current di/dt. They are measured

at nominal ampere-turns.

Figure 3: Response time t

r and reaction time tra

Ampere-turns and amperes

The transducer is sensitive to the primary current linkage Θ

P (also

called ampere-turns).

Θ

P = NP·IP (At)

Where N

P is the number of primary turn (depending on

the connection of the primary jumpers)

Caution: As most applications will use the transducer with only

one single primary turn (N

P = 1), much of this datasheet is

written in terms of primary current instead of current linkages.

However, the ampere-turns (At) unit is used to emphasis that

current linkages are intended and applicable.

Transducer simplified model

The static model of the transducer at temperature T

A is:

V

out = G·ΘP + overall error (mV)

In which error =

ε

G ·ΘP·G + εL··ΘP·G + TCG·(TA-25)·ΘP·G + V

OE + TCVOE·(TA-25) (mV)

With:

Θ

P = NP·IP

: primary current linkage (At)

Θ

P max

: max primary current linkage applied to the

transducer (A/t)

V

out

: output voltage (V)

T

A

: ambient operating temperature (°C)

V

OE

: electrical offset voltage (V)

TCV

OE

: temperature coefficient of V

OE (mV/K)

G

: sensitivity of the transducer (V/At)

TCG

: temperature coefficient of G (%/K)

ε

G

: sensitivity error (%)

ε

L

: linearity error for Θ

P (%)

This model is valid for primary ampere-turns Θ

P between -ΘP max

and +Θ

P max only.

Sensitivity and linearity

To measure sensitivity and linearity, the primary current (DC) is

cycled from 0 to I

P, then to -IP and back to 0 (equally spaced

I

P/10 steps). The sensitivity G is defined as the slope of the linear

regression line for a cycle between ± I

PN.

The linearity error ε

L is the maximum positive or negative

difference between the measured points and the linear regression

line, expressed in % of I

PN.

Magnetic offset

The magnetic offset voltage V

OM is the consequence of a current

on the primary side (“memory effect” of the transducer’s ferro-

magnetic parts). It is measured using the following primary

current cycle. V

OM depends on the current value IP1 (IP1> IPM).

Performance parameters definition

t

V

t

V

out

OM

2

)

(

)

(

2

1

−

=

P (DC)

-IP1

P1

0 A

t1

t

Ip(3)

t2

Ip(

3)

I

tra

V

tr

90 %

10 %

t

100 %

I

out

p

2

)

(

)

(

2

1

t

V

t

V

out

OE

+

=

)

25

(

)

(

)

(

C

...

T

...

T

...

OE

OT

°

−

=

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