5100
Series
Table
2-4.
Main
Output Group
i.
Warning Decal
Warning that lethal voltages may be
present at the output
terminals.
:
i
:
|
2. Sense
Switch
Push-Push toggle switch to select
internal
(2-wire) or external !4-wire)
sensing.
The
indicator
illuminated
signifies
the type of sensing
selected.
To change types depress the
switch
one
time
and the indicators
will
reverse.
3.
Output
Terminals
The
HI
and LO output terminals. All standard Voltage,
Current and
Resistance outputs
are
available
on these terminals. The maximum
difference
between the
HI
and LO terminals is
1100
Volts rms.
4. Sense
Terminals
Used
for
4-wire resistance and remote
voltage sensing. The allowable difference
between
Out-
put
HI
and Sense
HI
or Output LO and Sense LO
is
0,3
Volts,
'
5
5.
V
Guard
Connects to the inner
shield surrounding
the
analog sections
of
the
51 00A to
isolate
them
from
the chassis, I/O connections and digital section.
Normally connected
to Output Lo at either the
Front Panel or the Voltmeter under test.
6. 1
Guard
Provides a
driven shield "guard" around
output HI in the AC and DC Current
modes.
Held at
the
same
voltage as
Output
HI
by
a unity gain amplifier, is used to minimize the degradation of
accuracy
caused by stray
capacitance between
Output HI and Output
LO.
CAUTION
Output Current inaccuracies will
result if the
1-Guard
terminal
is
connected
to
the V-Guard, Output LO,
Chassis or Sense
terminal.
7.
50£2
Divider/
Override
The 500
DIVIDER indicator illuminates when an
output voltage
between
0 and 1.99999 Vdc
or
between
1 and 199.99 mVac
is selected to
notify the operator the
instrument
has
automat-
ically changed to
anjpternal precision 500
divider. The instrument
also automatically
reverts
to
internal
sensing,
if external
had been selected. This
divider
can be overridden in the dc
voltage mode
by
depressing the switch, which illuminates the OVERRIDE indicator. This
holds
the
instrument in the 20
Volt
range, dropping one or more digits; however, external
sensing can be
selected. If the amplitude of the output is changed while OVERRIDE is
selected,
the
instrument remains in OVERRIDE provided the amplitude stays within the
0
to 1.99999
dc
voltage
figure,
it
if
exceeds
that It
automatically
reverts to its normal operation, i.e.
both indi-
cators
extinguished; however, it remains
in internal sensing. If
external sensing
is desired it
must be
reprogrammed, either manually or through the remote interface.
Table
2-5.
Output Display Group
1.
Numeric
The absolute
numeric value
with decimal point and
polarity,
if
applicable, of
the
signal pre-
Display sent at the
output terminals.
2. AC
Indicator
Illuminated when the output signal is an AC Voltage
of Current.
3.
Multiplier
Indicator illuminates
to show the
multiplier
of
the
numeric display.
The
muitipiiers are
u(10'
6
*'
m(IO^), k
(
1
0
3
)
and M(10
6
}.
Units
(10°)
are
the default condition
with no
indicator illumi-
nated.
4. Function
Illuminated
to show whether the
function
displayed is Voltage (V), Current
(A),
Resistance
(£2)
or decibel milliwatts (dBm). Indicators D1 and D2
are
not
used
at this
time.
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