
If you do not intend to install any of the Variable Range options, then you will want to
follow the notes of Figure 7-7. Note that trim pot R41 is installed (it is not installed if a
variable range option is to be installed). W2 is installed, but J16 is not required. Though
it is not shown, D30 is not required either. If J16 and D30 are installed, this will not
affect the operation of the unit, they just will serve no purpose.
Position 8 Range Switch: Fixed
J16 is not required
Ensure W2 Jumper is Installed
Install R41
Figure 7-7: Range Switch Position 8 Fixed Range Considerations
If any of the variable range options are installed, then you should refrain from installing
R41. The front panel Variable Range Control will take over the function performed by
that trim pot.
J16 must be installed (unless, of course, you are hardwiring the Klee together). J16
provides the signal(s) to the front panel Variable Range control(s).
If any of the external range options are to be installed, D30 also
must
be installed. D30
provides protection from any negative voltages that may be applied to the External
Variable Range jack. This jack directly feeds the input of U7, which is a CD4051. The
CD4051 cannot accept a voltage lower than 0.5V below its supply rail. D30 is a BAT85
Schottky diode that will prevent voltages 0.4V below ground from being applied to U7.
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