Agilent Technologies 4294A Operating Manual page 439

memory (SRAM), which stores user calibration data, fixture compensation data, GP-IB
address, IP address, and so on. This is caused by the battery used for backup being drained.
To again enable the battery-powered backup memory, turn on the power and keep the
device on for approximately 10 minutes to charge the battery completely.
-160 Block data error
An error not described by error numbers from -161 to -169 occurs during the syntax
analysis of block data.
-168 Block data not allowed
A block data element is received where the Agilent 4294A does not accept any block data
element.
136 BRIDGE UNBALANCED
Because the connection of a DUT or the setting for it is incorrect, the internal circuit
(BRIDGE) temporarily cannot perform measurements (UNBALANCED).
• The setting of the four-terminal pair extension (NONE, 4TP 1M, 4TP 2M, 7mm
42942A, PROBE 42941A) may not match 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 conditions (for example, lowering
the measurement signal level).
If this error often occurs in normal measurements, the instrument may fail. In this case,
Contact your local Agilent Technologies sales office or the company you purchased this
instrument from.
13 CALIBRATION ABORTED
One of the following problems has occurred.
• In the middle of or after the completion of the setup for user calibration or fixture
compensation (measurement of required calibration data and calculation and storage of
error coefficients), the setting of calibration points (FIXED or USER) is changed. The
current setup and error coefficients previously stored become invalid.
• When the setting of calibration points is USER, in the middle of or after the completion
of the setup for user calibration or fixture compensation (measurement of required
calibration data and calculation and storage of error coefficients), the sweep condition
(sweep range, sweep parameter, number of sweep points, sweep type) is changed. The
current setup and error coefficients previously stored become invalid.
• In the middle of the setup for user calibration or four-terminal pair extension
(measurement of required calibration data and calculation and storage of error
coefficients), the setup is canceled (the cancel key, CALQUI command, or ECALQUI
command is executed). The setup is invalid, but error coefficients previously stored are
still available.
If necessary, again perform the setup for user calibration, fixture compensation, or
Appendix C
Block data error
C
Error messages
431