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8500
Series
Tab!© 2A-1.
Programming
Instructions (cont)
Ohms
Fast
Ohms
The
Z1 character
will
place the instrument
into
the
ohms
function
and
the
fast
ohms
mode.
In
normal
ohms
operation, the
unknown
resistor
value
Rx
is
computed
from
the following
measurements:
VI
-V2:
the voltage
across
an
internal
precision
resistor (Rr)
VO: the voltage
across
the
unknown
resistor (Rx).
The
value
of
Rx
is
then
computed
with
Ohm's
Law:
Rx
=
Rr
VO
VI -V2
Fast
Ohms
mode
differs
in
that
the value
of
Rr
(V1-V2)
ls
stored as
a
constant.
The
instrument
will
the
find
Rx
by measuring
VO and
multiplying
this
constant.
The
constant
will
change
with
a
function
change, range
change
or overload
condition.
NOTE
Fast
ohms
f'Zr)
differs
from
HIGH SPEED
READING
f'F).
When
using
"!"
for
ohms
measurement,
Rx
is
not
computed
by
the
DM
M.
RANGE
COMMAND
CHARACTERS
The
nine
range
commands
specify the following
maximum
values
by
function.
DC
VOLTS
VA
or
C
AC
VOLTS
1
Ut
DC
or
AC
Z
or
11
©Hfyis
0
Auto
Auto
CURRENT
Auto
Auto
00
312
mV
Auto
312
pA
31.250
00
2.5V
2.5V
2.5
mA
250Q
00
20V
20V
20 rnA
2
kO
00
160
V
160
V
160
mA
32
kO
00
1200V
1000V
1.28A
256
kO
00
Auto
Auto
Auto
4.096
MO
00
Auto
Auto
Auto
32.768
MO
00
Auto
Auto
Auto
262.144
MO
2A-9
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