Service manual

224 Appendix C
Error messages
Order of Alphabet
NOTE If an error with a positive error number occurs, only its error message is displayed on the
LCD following the string of “CAUTION:” (in this case, its error number is not displayed).
On the other hand, if an error with a negative error number occurs, “CAUTION: GPIB error
occurred” is always displayed on the LCD. When error messages are outputted through
GPIB, their error number and error message are outputted for all errors (“CAUTION:” is
not added). Some messages displayed on the LCD do not have “CAUTION:”; these are not
error messages. Messages without “CAUTION:” are not described here.
Errors with a negative error number are basically general errors for GPIB instruments
defined by IEEE488.2. On the other hand, errors with a positive error number are ones
defined specifically for the 4294A.
Order of Alphabet
A
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.
10 ADDITIONAL STANDARDS NEEDED
Before the measurement of all the calibration standards (OPEN, SHORT, LOAD) required
to complete user calibration or four-terminal pair extension setting were completed, an
GPIB command (CALDON or ECALDON) to calculate error coefficients was sent. The
command was invalid. Measure all the required calibration standards.
B
17 BACKUP DATA LOST
The contents of the battery-backed memory (SRAM), storing user calibration data, fixture
compensation data, GPIB address, IP address, and so on, were lost, causing an error (check
sum error). Its cause is running out of the battery for backup. To enable the battery backup
for the memory again, turn on the power and keep it approximately 10 minutes to charge
the battery completely.
-160 Block data error
An error not included in error numbers between -161 and -169 occurred during the syntax
analysis of block data.
-168 Block data not allowed
A block data element was received at where the 4294A did not accept any block data
elements.