Agilent Technologies 4294A Instruction Manual download pdf (Page 117)

Chapter 5 109

Setting Measurement Conditions

Setting and Applying dc Bias

5. Setting Measurement

Conditions

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

MEAS RANGE [ ] key to display the dc bias range menu.

Step 2. Press the 1mA key to select 1 mA as the dc bias range (preset state is 1 mA).

Step 3. Press the

return key to return to the dc bias menu.

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).

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.

Step 2. Press the

return key to return to the dc bias menu. Note that the dc bias range currently

Softkey label Applied dc bias

DC BIAS on OFF Off

DC BIAS ON off On

dc bias range Key stroke

1mA

10 mA 10mA

100 mA 100mA

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Agilent Technologies 4294A Instruction Manual Page 117