Agilent Technologies 4284A, Operation Manual

Page: 74 / 460

k) in series b et w een the INT DC BIAS MONITOR connector and
the H
CUR
T erminal. So if y ou use a dc v oltmeter to nd the actual
DC bias v oltage, use the following formula to calculate it.
V
dc
= (1 +
9 : 9 k
R
in
) 2 V
m
0 V
l ow
Where,
V
dc
: Actual DC bias v oltage
R
in
: Input Resistor of the DC v oltage meter
V
m
: Actual monitor v alue at the INT DC BIAS
MONITOR connector
V
low
: Residual v oltage at the LO W T erminal (Typical: 2
mV, Max.: 6 mV (DCI:ISO ON), 20 mV (DCI:ISO
OFF))
Figure 3-7. DC BIAS Monitor Circuits
Front P anel Operation for Setting the DC Bias
There are t w o w a ys to set the DC bias, one is to use the softkeys,
and the other is to use the n umeric en try k eys. P erform the follo wing
steps to set the DC bias.
1. Mov e the cursor to the BIAS eld. The follo wing softkeys will b e
display ed.
a.
NNNNNNNNNNNNNNNNNNNN
INCR *
Press this softkey to increase the DC bias lev el.
b.
NNNNNNNNNNNNNNNNNNNN
DECR +
Press this softkey to decrease the DC bias lev el.
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