HP 4284A - Page 357

DC Bias (1.5 V/2 V)
Output Current: 20 mA max.
Option 001 (Power
Amp/DC Bias)
DC Bias Voltage
DC Bias voltage applied to DUT ( V
dut
) is given as,
V
dut
= V
b
0 100 2 I
b
[ V ]
Where, V
b
is DC bias setting voltage [V],
I
b
is DC bias current [A].
DC Bias Current
DC bias current applied to DUT ( I
dut
) is given as,
I
dut
=
V
b
100 + R
dc
[ A ]
Where, V
b
is DC bias setting voltage [V],
R
dc
is the DUT's DC resistance [].
Maximum DC bias current when the normal measurement can b e
performed is as follows.
Measurement
Range
10  100  300  1k 3k 10 k 30 k 100 k
Bias Current
Isolation
On 100 mA
O 2 mA 2 mA 2 mA 1 mA 300  A 100  A30  A 10  A
Relative Measurement Accuracy with Bias Current Isolation
When the bias current isolation function is set to ON, add the
display uctuation (N) given in the following equation to the Ae
of relative measurement accuracy (Refer to \relative measurement
accuracy" of sp ecication).
The following equation is sp ecied when all of the follo wing
conditions are satised.
DUT imp edance  100 
Test signal level setting  1V
rms
DC bias current  1mA
Integration time : MEDIUM
N=P 2
DUT
imp edance
[]
Measurement Range []
2
DC
bias current
[mA]
Test signal level [V
rms
]
2
1
p
n
2 10
0 4
[%]
Where, P is the coecient listed on Table A,
n is the number of averaging.
9-24 General Information