Turning Dc Bias On Or Off; Optimizing Dc Bias Range - Agilent Technologies 4294A Operating Manual

range as narrow as possible without causing the error message "DCBIAS OVERLOAD"
(error number: 137) to appear. An initial dc bias range of 1 mA is recommended for the
first measurement when dc bias is applied.
NOTE When you do not apply dc bias, always set the dc bias range to 1 mA, which is the preset
setting. Keeping this setting is especially important when you run through the sequence of
applying dc bias, turning off dc bias, and then performing a measurement.
Step 1. Press the
Step 2. Press the
Step 3. Press the
NOTE Always set the dc bias range to 1 mA when you measure without applying dc bias.

5. Turning dc bias ON or OFF

Step 1. Press the BIAS on OFF (or BIAS ON off) key to make your selection (pressing the key
toggles your selection).
Softkey label
DC BIAS on OFF
DC BIAS ON off
NOTE
When the error message "CAUTION: DCBIAS OVERLOAD" (error number: 137)
appears in the instrument message area in the upper left part of the screen after turning dc
bias ON, follow the steps given in "6. Optimizing dc bias range" to set the appropriate
range for the dc bias.
Turning dc bias ON displays "DC BIAS ON" in the lower right area of the screen and also
shows the application status of the dc bias (indicating dc bias mode and whether dc voltage
exceeds the limits). See "dc bias status" on page 57 for details.

6. Optimizing dc bias range

Step 1. When the error message "CAUTION: DCBIAS OVERLOAD" (error number: 137)
appears after applying dc bias, increase the dc bias range by 1 step until the message
disappears. Then select the narrowest possible range.
dc bias range
1 mA
10 mA
100 mA
Step 2. Press the
Chapter 5
key to display the dc bias range menu.
MEAS RANGE [ ]
key to select 1 mA as the dc bias range (preset state is 1 mA).
1mA
key to return to the dc bias menu.
return
key to return to the dc bias menu. Note that the dc bias range currently
return
Setting Measurement Conditions
Setting and Applying dc Bias
Applied dc bias
Off
On
Key stroke
1mA
10mA
100mA
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