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The SI1287
can
generate two
types of overloads: measurement
overloads and
input overloads.
Measurement Overloads
are reported
when
the voltage
or current DVMs
measure
a value which is
too large for the measurement range. This
means that
the overloads
can only be reported when measurements
are
taking
place.
The measurement
overloads are :
Message Error
Number Meaning
Current DVM
O/L Error 31 Readings from the current
DVM have
exceeded the range.
Voltage DVM O/L Error
32 Readings from the voltage
DVM have
exceeded the range.
Both DVM O/L Error
33 Readings from the voltage
and current
DVMs have exceeded their respective
ranges.
Measurement overloads are
reported in the following ways
:
Display Message
flashes on the display and the error beeper sounds
(if
enabled).
GPIB The error number
appears in the output next to the result.
(Note : The error
bit in the serial
poll register is NOT set, although the error
can still be
queried
using the ?ER
command.)
RS423 The error number
appears in the output next
to
the result.
Input Overloads are detected
by comparators in the instrument hardware
and can
be reported at any
time provided
the appropriate
input
is enabled internally
(S11287 in half-standby or ON).
This ensures the instrument can report
situations
which may
be damaging to the
test cell even
if measurements
are not being
taken.
The input overloads
are :
Message Error
Number Meaning
RE1 O/L Error
35 Voltage on
RE1 input exceeds a nominal
15.4V.
RE1-RE2
O/L Error
36 Voltage between RE1 and
RE2 exceeds
a
nominal
15.4V.
Current OIL Error
37 Current into the WE terminal
has exceeded
the range
selected by the sense resistor.
Current Limit
Error 38 Current into
the WE terminal has exceeded
the range selected
by
the
sense resistor and
the SI1287
is limiting the current.
S11287 Standby
Error 39 Current into
the WE terminal has exceeded
the range selected
by
the
sense resistor and
the SI 1287 has gone into standby.
B.4
CSB/SI1287 User Guide/issue AA
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