User`s manual

74 Chapter 3
O:\Manuals\E6380A_Progguid\Book\Guidelin.fm
HP-IB Command Guidelines
Guidelines for Operation
Guidelines for HP-IB Units
• When setting the value of a numeric field (such as AFGen1 Freq),
any non–HP-IB Unit unit-of-measure must be specified in the
command string, otherwise the current HP-IB Unit is assumed by
the Test Set.
For example, if the command RFG:FREQ 900 is sent through HP-IB,
the Test Set will interpret the data as 900 Hz, since HZ is the HP-IB
Unit for frequency. This would result in an Input value out of
range error. Sending the command RFG:FREQ 900 MHZ would set
the value to 900 MHz.
• When querying measurements or settings through HP-IB, the Test
Set always returns numeric values in HP-IB units, regardless of the
current Display Unit setting. Numeric values are expressed in
scientific notation.
For example, if the TX Frequency measurement is displayed as
150.000000 MHz on the Test Set, the value returned through HP-IB
is 1.5000000E+008 (1.5 X10
8
). Converting the returned value to a
format other than scientific notation must be done
programmatically.