Fluke 8502A - Source Impedance

8502A
Table
1-3.
Specifications (Cont)
JNSTRUMEMT OPERATING CHARACTERfSTfCS (Continued)
!
DC Ratio
1
INPUT IMPEDANCE
SOURCE IMPEDANCE
Ext Ref HI or LO > 10,000
relative
to
Ohms Resistive Unbalance
(Ext
Ref
HI to LO)
<4
;
Guard*
or Sense
LO
j
1
Total Resistance Sense LO
from either
HI
or
LO
<20
kCl
BIAS
CURRENT
OVERLOAD
(Ext
Ref
HI
or LO)
i
Ext Ref HI or
LO
relative
to Ohms
Guard*
or ±180
volts
peak
,
127V
rms (relative
to Ohms
Sense
LO <5 nA
Guard*
or
Sense
LO) X (360V
peak
Hi to LO)
t
*
Ohms
Guard available through rear input
(-16
or
-17
Option)
NOISE REJECTION
Normal Mode Common Mode, All
Inputs Driven
Sense
Input—Same as dc volts
Ext Ref Input—dc, line frequency and
2x
line freq-
uency >100 dB
Sense input—
Same as dc volts
Ext Ref Input—Line frequency and
2x
line frequen-
cy, 75 dB
Settling Time
Sense Input Fast Filter
< 50 ms to 0.001%
of
change
Sense Input Slow Filter <500 ms to
0.001%
of
change
Digitizing Time
NOTE
The Sense Input is measured
prior
to
measur-
ing Ext Ref HI and L
0.
Ext Ref Input-Each input Hi and LO
90 ms at 60
Hz line frequency
107
ms
at
50
Hz line
frequency
Ext
Ref Calibration—1 2 ms
EXT
REF
VOLTAGE RANGE
Maximum Ext Ref Voltage
=
±
40V between Ext Ref HI and LO terminals,
providing neither ter-
minal is greater
than ±
20V relative to the
Sense
LO or
Ohms Guard
terminals.
Minimum
Ext
Ref
Voltage
=
±0.0001
V,
or
(whichever is greater)
10
^
MAXIMUM DISPLAY-
Ratio. Scaling or
Offset Mode
=
±1.00000
x
10^
in all Ranges
Sense
Input
Approx. Digitizing
Rdg. Rate Time
60 Hz
4Va rdg/s 136
ms
1 Vi rdg/s 536
ms
50
Hz
SVa
rdg/s
1 Va.
rdg/s
162 ms
642
ms
60 Hz
4 samples/rdg 18 ms
50 Hz
4 samples/rdg 22 ms