Inside the 1902
52
The various adjustable pots and the Radiall SMB calibration
connector are described in the calibration procedure (see
page 46 onwards). Apart from that, there are only two features
on 1902 circuit boards that may be relevant to users:
The switch labelled ‘OPT0’ on the 4-way switchpack is the
most significant bit of the 1902 channel number. When this is
off, the most significant bit is set to 1, and the channel number
selectable by the rear-panel rotary switch will be in the range
16-31. The switchpack is indicated on the diagram on page 51.
The other three switches are reserved for future expansion.
They should be left as they are.
If you need to change the notch filter frequency, a link has
either to be closed (for 60 Hz) or open (for 50 Hz). This link is
indicated on the diagram on page 51.
A full set of circuit diagrams can be supplied to authorized
personnel on request. There will be an administration charge for
this service, and purchasers must sign a non-disclosure
agreement.
Features of the
motherboard
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