NOTE
2-16.
DESCRIPTION
2-17.^
The 8502A’s display consists of a
digit
readout,
exponent, and LED annunciators for indication of instru-
ment
function
and
status. Spedtlcaiiy, these features prtv-
vide:
]. 5 1/2 or
6
1/2
digit display with polarity, auto-
matic reading and decimal placement.
2.
Exponent display
with polarity
for
readings in
engineering notation. Serves as an extra digit of res-
olution in
Hi Res and
Ca!
modes,
3.
Function and autoranging
indicators light
for
function selected and for autoranging.
4.
Status
indicators give a constant illumination to
signify selection of
REMOTE, OFFSET, PEAK,
SCALING, slow FILTER. Dual
function LED’s
will flash to indicate
selection
of CAL or
EXT REF.
SAMPLE LEDwill flash at the reading
rate selected
(with
more than 128 samples per
reading, the LED
will flash at the same rate to denote a reading in
progress).
5 . Power ON LED.
2
-
18
.
WARNING INFORMATION
2-19.
The
digit and exponent displays will
provide
warning
indications
and
error codes.
1.
“HHHHHH” will flash at the reading rate if the
input voltage exceeds the full scale value for the
range selected.
Full
scale values are included with
the specifications in Section 1.
2. “H”
will
flash
in the exponent
display should an
input
voltage greater
than
40V
occur when in the
Scaling, External Reference or
Offset modes.
3.
These flashing indications will not be seen when in
the Cal
mode.
NOTE
Flashing
indicators
in the
digit or exponent
display are a warning only; they have no
effect
on
instrument operation.
4.
Error codes will be provided in
the digit and expon-
ent displays when
appropriate. Consult Table
2-2
for
applicable meanings.
Error codes will not
be
displayed
in
Cal
mode.
Random, readings will then be the only indic-
ation
of
an invalid
fiinction
or
faulty
module.
Table
2-2.
Error Codes
CODES FAULT
Error System
error
-
if
this error message
appears prior
to
the
introductory messages
at
power initialization or
reset, the problem is with the calibration memory
module.
Error 0 VDC/Ohm Zero
Error
-
either
a VDC/Ohm
Zero
was
attempted
in
a
range other than 100
mV
or
10 ohms,
or an overrange was
entered.
Error I Store during overload condition attempted.
Error
2
Filter
module
error
—
the
module
is
faulty or
not
installed.
Error 3
pc
Signal Conditioner
error
—
the
module is faulty
or not installed.
Error 4 Ohms or Current error
—
excessive voltage applied to
the
selected module, shorting links not properly con-
nected, or the selected module is
faulty.
Error
5 R A/D
error
—
the
recirculating remainder analog
to
digital converter module is faulty or not installed.
Error
6
Numeriedisplay
ovwflow error.
Error
7
External Referen(» error
—
the magnitude of one of
the external reference inputs is greater than
20V
dc.
Error
8
Controller
error
—
the module is faulty or
not
installed.
Error
9
Function Selection error
—
the function module sel-
ected, other than
dc
volts, is faulty or not installed.
Error
C
Invalid switch sequence during Recall or Store oper-
ations.
2-20.
SPECIAL
CONSIDERATIONS
2-21.
Cal
2-22.
Use of the Cal mode will significantly change nor-
mal display indications. As
noted above,
no
warning indic-
ations will be displayed.
Further,
the exponent
display will
now serve as an extra digit of resolution
(yielding 6
1/2
digit
resolution).
2-23.
Hi Res
2-24-
The exponent display will be used as an extra digit
of
resolution in
the High Resolution
mode (not used in the
100
mV or 100 uA ranges). No exponent will be displayed.
2-4
To Next Page
Loading...
