HP 4284A - Page 347

K
a
and K
b
values are the incremental factors in low imp edance
and high imp edance measurements, resp ectively. K
a
is practically
negligible for imp edances ab ove 500 , and K
b
is also negligible for
imp edances b elow 500 .
Table 9-1. Impedance Proportional Factors K
a
and K
b
Integ-
time
Frequency K
a
K
b
MEDIUM
LONG
f
m
< 100 Hz

1 2 10
0 3
j Z
m
j

0
1+
200
V
s
1

1+
q
100
f
m

j Z
m
j
0
1 2 10
0 9
1
0
1+
70
V
s
1

1+
q
100
f
m

100 Hz  f
m
 100 kHz

1 2 10
0 3
j Z
m
j

0
1+
200
V
s
1
j Z
m
j
0
1 2 10
0 9
10
1+
70
V
s
1
100 kHz < f
m
 300 kHz

1 2 10
0 3
j Z
m
j

0
2+
200
V
s
1
j Z
m
j
0
3 2 10
0 9
10
1+
70
V
s
1
300 kHz < f
m
 1 MHz

1 2 10
0 3
j Z
m
j

3+
200
V
s
+
V
2
s
10
8

j Z
m
j
0
10 2 10
0 9
10
1+
70
V
s
1
SHORT f
m
< 100 Hz

2 : 5 2 10
0 3
j Z
m
j

0
1+
400
V
s
1

1+
q
100
f
m

j Z
m
j
0
2 2 10
0 9
10
1+
100
V
s
1

1+
q
100
f
m

100 Hz  f
m
 100 kHz

2 : 5 2 10
0 3
j Z
m
j

0
1+
400
V
s
1
j Z
m
j
0
2 2 10
0 9
10
1+
100
V
s
1
100 kHz < f
m
 300 kHz

2 : 5 2 10
0 3
j Z
m
j

0
2+
400
V
s
1
j Z
m
j
0
6 2 10
0 9
1
0
1+
100
V
s
1
300 kHz < f
m
 1 MHz

2 : 5 2 10
0 3
j Z
m
j

3+
400
V
s
+
V
2
s
10
8

j Z
m
j
0
20 2 10
0 9
10
1+
100
V
s
1
f
m
:Test Frequency [Hz]
j Z
m
j : Imp edance of DUT []
V
s
:Test Signal Voltage [mV
rms
]
K
aa
is practically negligible for imp edances ab ove 500 .
Table 9-2. Cable Length Factor K
aa
Test Signal
voltage
Cable Length
0m 1m 2m 4m
 2V
rms
0 0
K
a
2
K
a
> 2V
rms
0
2 2 10
0 3
2 f
2
m
j Z
m
j
(1+5 2 f
2
m
) 2 10
0 3
j Z
m
j
(2+10 2 f
2
m
) 2 10
0 3
j Z
m
j
f
m
:Test Frequency [MHz]
j Z
m
j : Imp edance of DUT []
K
a
: Imp edance Prop ortional Factor
9-14 General Information