12.29.4
Output
The until will deliver up to 20mA at 50V with a total regulation of about 0.2V.
The ripple does not exceed 10mV.
12.30 Injection Unit (Specification)
Any equipment connected to an inject socket should comply with the
following:
12.30.1
Screened Transformers should be used both in the send and the return
leads. These should be connected to the inject plug by twisted screened pair leads.
12.30.2
The impedance at the primary of the send transformer should not be less
than 3k
Ω
and the impedance at the secondary of the return transformer should not
be greater than 200
Ω
.
12.30.3
The send transformer will be fed from 20
Ω
in series with a capacitor of
nominally 6.8, 4.7 or 2.7µF.
The receive transformer will feed into not less than 3k
Ω
.
12.30.4
The nominal level at both send and return will be –10dBV and at least 20dB
overload margin should be allowed for.
