Agilent Technologies 4294A Service Manual download pdf (Page 499)

Appendix D 499

Error messages

Error number: 134

1. Chapter Title

2. Chapter Title D. Error messages

4. Chapter Title

5. Chapter Title

specify the lower limit of a partial search range (SEARMIN) or a command to specify the

upper limit of a partial search range (SEARMAX) and, as a result, the command was

ignored. When the sweep type is the list sweep, you cannot specify a partial search range

using the lower limit and the upper limit. Before specifying a partial search range using the

lower limit and the upper limit, specify a sweep type other than the list sweep (command:

SWPT LIN or SWPT LOG).

134 REDUCE OSC LEVEL

The oscillator level is considerably higher than the measured |Z| (absolute value of

impedance) of the DUT, causing increased nonlinear measurement error that cannot be

ignored. This message is displayed when the oscillator level is set to greater than 0.5 V

while |Z| of the DUT is smaller than 48 Ω. To avoid this error, set the oscillator level below

0.5 V.

135 ADC OVERLOAD

Due to, for example, a sudden change of the connection of a DUT, the internal circuit

(ADC) was temporarily overloaded. Measurement data at the occurrence of this error is

invalid. If this error often occurs in usual measurements, the instrument may fail. In this

case, Contact your local Agilent Technologies sales office or the company you purchased

this instrument from.

136 BRIDGE UNBALANCED

Because the connection of a DUT or the setting for it was incorrect, the internal circuit

(BRIDGE) temporarily could not perform measurements (UNBALANCED).

• The setting of the four-terminal pair extension (NONE, 4TP 1M, 4TP 2M, 7mm

42942A, PROBE 42941A) may not match with the fixture, cable, adapter, or probe

actually connected. Check and correct the setting.

• The setup (acquisition of calibration data) for the setting of the four-terminal pair

extension may have failed. If necessary, perform the setup again.

• Some measured DUTs may cause this error due to their characteristics. In this case, the

error may be avoided by changing the measurement condition (for example, lowering

the measurement signal level).

If this error often occurs in usual measurements, the instrument may fail. In this case,

Contact your local Agilent Technologies sales office or the company you purchased this

instrument from.

137 DCBIAS OVERLOAD

When the DC bias was applied, DC current that exceeded the setting of the DC bias range

(<1mA, <10mA, or <100mA) was supplied from the bias source, or the overcurrent limit

circuit of the DC bias source operated. Increase the setting of the DC bias range, or

decrease the level of the applied DC bias.

138 DCBIAS CONSTANT OPERATION FAILED

When the DC bias mode was constant voltage (VOLT CONSTANT) or constant current

(CURRRENT CONSTANT), the actual DC bias output did not converge to the set DC

voltage value or DC current value, or it exceeded the set voltage limit or current limit. If a

DUT needs time to be stabilized after DC bias is applied, specify the point delay. If

necessary, change the voltage limit value or the current limit value.

139 DCBIAS LEVEL MONITOR NOT VALID

When the DC bias level monitor was not on, you attempted to execute the command to turn

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Agilent Technologies 4294A Service Manual Page 499

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