HP 4284A - Page 73

DC Bias
Description
The HP 4284A has internal dc bias voltage selections of 0 V, 1.5 V,
and 2.0 V.
When option 001 is installed, the dc bias voltage can be set from 0
Vto 6 40 V with a resolution as listed in Table 3-4, or the DC bias
current can be set from 0 A to 6 100 mA with a resolution as listed
in Table 3-4.
Note
Option 001 can b e made valid or invalid from the MEAS SETUP
page. When the option 001 function is used, the high power mo de
must be set to ON from the MEAS SETUP page. (For more
information, refer to Chapter 4.)
Table 3-4. DC bias and Resolution (Opt.001)
Mode DC Bias Level Resolution
Voltage 6 (0 V to 4 V)
6 (4.002 V to 8 V)
6 (8.005 V to 20 V)
6 (20.01 V to 40 V)
1mV
2mV
5mV
10 mV
Current 6 (0 A to 40 mA)
6 (40.02 mA to 80 mA)
6 (80.05 mA to 100 mA)
10  A
20  A
50  A
Note
The setting value of the dc bias current is the value set when the
measurement contacts (UNKNOWN Terminals) are shorted. (Refer
to Figure 3-6.) When a DUT is connected to the measuremen
t
contacts, the setting currentvalue is dierent from the actual current
through the DUT. To determine the bias current through a device,
refer to BIAS CURRENT ISOLATION FUNCTION, Chapter 4.
The setting value of the DC bias voltage is the value set when the
measurement contacts (UNKNOWN Terminals) are op ened.
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