Omega Vehicle Security OM-550 Manuel D’Utilisation

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EXAMPLE: Given a 20 - 90 % RH (Relative Humidity) transducer with a 0 - 10 VDC
output at a maximum current of 3 mA.

Program the OM-550 to indicate 20.00 %RH to 90.00 %RH (that is, to indicate %RH
with 0.01% resolution).

If a ±10 Voltage Probe is being used, begin with step 3, below. (This probe is already
matched to the OM-550).

1. First, find the Matching resistors:

I =

1/2 maximum current

=

0.003 / 2

=

0.0015 Amps

R1

= 2 / I

R2 =

(V - 2) / I

=

2 / 0.0015

=

(10 - 2) / 0.0015

=

1333 

Ω

=

5333 

Ω

2. Check:

V=

(R1 + R2) * I

V =

R2 * I

=

(1333+5333)*1.5 mA

=

1333*1.5 mA

=

9.999

=

1.9995

=

10

=

2

With these matching resistors the OM-550 will see a max 2 VDC at the Transducer max
output of 10 VDC.