R&S ZVB - Page 1001

R&S
®
ZVA / R&S
®
ZVB / R&S
®
ZVT Command Reference
SCPI Command Reference
Operating Manual 1145.1084.12 – 30 986
frequency converter.
 -6, "no simultaneous measurement possible"
Simultaneous Measurement with Frequency Offset requires that port groups may actually be
measured simultaneous. There are some situations in which this is not possible (see Define Port
Groups); in these situations Simultaneous Measurement with Frequency Offset is not available.
 -7, "stimulus buffer too small"
The stimulus buffer must contain at least two elements.
 -8, "invalid offset or frequency spacing"
The frequency offset which is actually used and which is determined both by the minimum
frequency offset and the frequency spacing may not be too large as in that case the VNA is not
able to simultaneously measure at different frequencies anymore. There is no simple formula
specifying the maximum frequency offset which can be handled by the VNA. However, in all but
very special cases an actual frequency offset of several MHz can be used, even with four or more
port groups. Please note, however, that a small minimum frequency offset combined with a large
frequency spacing may lead to a large actual frequency offset.
 -9, "extended stimulus buffer too large"
Internally, the firmware uses additional measurement points which are completely transparent to
the user. However, the number of sweep points entered by the user plus the number of additional
internal sweep points (called the "extended stimulus buffer") must not exceed the maximum
number of sweep points (60001). The number of additional sweep points depends on the relation
between minimum frequency offset and frequency spacing. The worst case occurs when the
minimum frequency offset is equal to or greater than the sweep range, in this case the extended
stimulus buffer contains the number of sweep points entered by the user times the number of port
groups.
<Ch>
Channel number.
If unspecified, this parameter is set to 1.
SCPI, Command Types
Device-specific, query only
Example:
See SOURce<Ch>:GROup:SIMultaneous:FOFFset[:STATe]
SOURce<Ch>:GROup:SIMultaneous:FOFFset:MOFFset:BWFactor <bandwidth
factor>
This command is used for Simultaneous Measurement with Frequency Offset to define the multiplication
factor to calculate the minimum frequency offset in BANDwidth mode from the measurement bandwidth.
If SOURce<Ch>:GROup:SIMultaneous:FOFFset:MOFFset:MODE is set to DIRect, the value set via
this command has no effect. For details see description for command
SOURce<Ch>:GROup:SIMultaneous:FOFFset:MOFFset:MODE.
<Ch>
Channel number.
If unspecified, this parameter is set to 1.
<bandwidth factor>
The multiplication factor to calculate the minimum frequency offset.
Range [def. unit]
1 to 100 [-]
*RST value
10