.TH E1432_BOB 5 E1432
.SH NAME
e1432_bob \- Description of E1432 break-out box options
.IX e1432_bob(5) 5
.SH DESCRIPTION

When a smart break-out box (BoB) is attached to an E1432 or E1433
module, the BoB provides additional input modes that are not available
without a BoB.  For example, a Charge BoB provides a charge input
which allows us to use \fBE1432_INPUT_MODE_CHARGE\fR.  A Mike BoB
provides a microphone input which allows us to use
\fBE1432_INPUT_MODE_MIC\fR or \fBE1432_INPUT_MODE_MIC_200V\fR.

\fBE1432_INPUT_MODE_VOLT\fR works the same whether a BoB is attached
or not.  All BoBs allow the module to program the low-side to be
floating or grounded.  (If no smart BoB is present, we accept the
e1432_set_input_low function to program floating/grounded, but we
don't actually do anything except remember the value.)  All BoBs also
provide a programmable ICP current source, allowing
\fBE1432_INPUT_MODE_ICP\fR to be used.

For either \fBE1432_INPUT_MODE_VOLT\fR or \fBE1432_INPUT_MODE_ICP\fR,
the ranges that are available are the same as when no BoB is attached:
0.1 to 20 volts for the E1432, and 0.005 to 10 volts for the E1433.
The default range setting is 10 volts.  The range setting is
controlled by the \fIe1432_set_range\fR function.

For a Charge BoB, the charge input ranges are specified in
picocoulombs, and are controlled by the \fIe1432_set_range_charge\fR
function.  The charge amp has several programmable gain settings,
allowing a very wide set of range settings.  For the E1432, the charge
range settings available are 0.1 to 50000 picocoulombs.  For the
E1433, the charge range settings available are 0.005 to 50000
picocoulombs, although ranges below 0.1 are probably not very useful
because of noise and offsets.  The default charge range setting is
50000 picocoulombs.  The Charge BoB also provides a 2 kHz low-pass
filter which can be switched on and off, for the charge input only.
This filter can be controlled with the \fIe1432_set_filter_freq\fR
function.

For a Mike BoB, the microphone input measures volts, and is controlled
by the \fIe1432_set_range_mike\fR function.  The microphone input
allows the input ranges to extend beyond the ranges that are normally
available.  The microphone ranges allowed are 0.01 to 50 volts for the
E1432, and 0.0005 to 50 volts for the E1433.  The default microphone
range setting is 10 volts.

Both the Charge BoB and the Mike BoB have an option 402 version of the
BoB, which provides an additional high-pass filter which can be
enabled or disabled programmatically.  This high-pass filter works
only when the Charge BoB is in Charge mode, or the Mike BoB is in
Microphone mode (\fBE1432_INPUT_MODE_MIC\fR or
\fBE1432_INPUT_MODE_MIC_200V\fR).  This high-pass filter is controlled
by the \fIe1432_set_coupling\fR function, and is in addition to any
other AC coupling on the input.  The high-pass filter is a third order
Butterworth filter.  On the Charge BoB, the cutoff frequency is about
10 Hz.  On the Microphone BoB, the cutoff frequency is about 22.4 Hz.

.SH "SEE ALSO"
.na
e1432_set_coupling, e1432_set_filter_freq, e1432_set_input_mode,
e1432_set_range, e1432_set_range_charge, e1432_set_range_mike
.ad
