Typical Lead Connections - Datron 4708 User Handbook Manual

Typical
Lead Connections
Voltage
and
Resistance Outputs
CAUTION:
All leads
and
cables
must be proofed
to at least
NOTE:
Refer
also
to
reactive load
specifications in Section
6.
2kV,
Simple
2-wire
Connection
Use
for
many
applications
where:
The
voltage drop
in the leads
is
insignificant.
The
E-M
environment
is 'quiet'.
External
common-mode
voltages are insignificant. 4708
Use
for
measurements
in the
following
ranges:
Terminals
Voltage
DCV
> lOOmV
ACV
>
lOOmV
Frequency
F
< lOOkHz
Resistance
IkO <
R
<
IMQ
N.B.
After
selecting Q,
Remote
Sense must be
cancelled
for 2-
wire
operation.
Select
Local Sense and Local Guard.
Keep
leads as short as possible, (not longer than
1
meter-twisted Load
pair
is
preferable).
Terminals
On
lOOV/lOOOV
Ranges,
Ground
the
Lo
line
for Safety.
-
Screened
2-wire
Connection
Use
where:
Sensitive measurements
are
being made.
The
E-M
environment
is
relatively 'noisy'.
External
common-mode
voltages are
significant.
Use
for
measurements
in the following
ranges:
Voltage
DCV
>
lO^iV
ACV
>
90p.V
Frequency
F < IMHz
Resistance IkQ.
< R
<
IMQ
After selecting Q,
Remote
Sense must be
cancelled
for 2-
wire
operation.
Select Local Sense and Local Guard.
Keep
leads as short as possible, (not longer than
1
meter).
On
lOOV/lOOOV
Ranges,
Ground
the
Lo
line
for Safety.
4708
Terminals
Load
Terminals
0
0
.©
1+
X-
^
/
Gu
Local
Guard
Local
Sense
Local
Guard
Local
Sense
X+
I-
^
/
Gu
Screened
4-wire
Connection
using Coaxial
cable.
Use
where:
The
load resistance
is
low enough
to
cause a
signifi-
cant voltage drop
in the output connection.
Sensitive
measurements
are
being made.
The
E-M
environment
is
relatively noisy.
External
common-mode
voltages are
significant.
Use
for
measurements
in the
following
ranges:
Voltage
DCV
> 90mV
ACV
> 90mV
Frequency
F
<
IMHz
Resistance
Not
appropriate
4708
Terminals
Select
Remote
Sense and Local Guard.
Keep
leads as short as possible, (not longer than
1
meter).
Load
Terminals
On
lOOV/lOOOV
Ranges,
Ground
the
Lo
line for Safety.
Local
Guard
4-4