Agilent Technologies ENA Series User Manual page 392

Troubleshooting
Error Messages
-121 Invalid character in number
A character that is invalid for the data type subject to syntactic analysis has been received.
For example, a letter is found in a decimal numeric value or a numeric character "9" in
octal data.
-171 Invalid expression
The expression-data element is invalid (see 7.7.7.2, IEEE488.2). Parentheses are not
paired, or illegal characters are used, for example.
-103 Invalid separator
The parser (a syntactic analysis program) had been expecting a delimiter, but a character
that is not a delimiter has been sent.
-151 Invalid string data
Character string data has been expected, but the character string data that appears is invalid
for some reason (see 7.7.5.2, IEEE488.2). The END message is received before the ending
quotation mark character appears, for example.
-131 Invalid suffix
The suffix does not comply with the syntax defined in 7.7.3.2, IEEE488.2. Or it does not
suit 4294A.
L
53 Log sweep requires 2 octave minimum span
The span of sweep range is not satisfied the requirement for logarithmic sweep. The sweep
type is automatically changed to linear sweep when this error occurs.
For example, this error occurs when, with the start and stop frequency are set 1 MHz and 2
MHz respectively, the sweep type is changed to logarithmic sweep.
Set the stop frequency to more than four times as many as the start frequency. And then
select logarithmic sweep.
M
-109 Missing parameter
The number of parameters is less than that required for the command, or the parameter has
not been entered. For example, the command SENS {1 - 6} :SWE:POIN requires one more
parameter.
Therefore, when a message "SENS1:SWE:POIN" is sent to a correct program message
"SENS1:SWE:POIN 201" this instrument receives the former message as an invalid one
because all parameters have not been entered. Enter command parameters correctly.
N
-120 Numeric data error
An error resulting from the numeric value data (including numeric value data having no
decimal point representation) has occurred. A numeric value error other than Errors -121
through -129 has occurred.
384 Appendix B