Giga-tronics 8003, Руководство по эксплуатации

Страница: 196 / 258

8003 Precision Scalar Analyzer
3-54 Manual 20791, Rev. C, June 2001
3.3.27 Swept Measurement Command Structure
SWP, SWP?
Current Swept Measurements:
Swept power measurements are defined by a command string beginning with SWP. The
addition of the question mark affixed to the end of the SWP verb is a query flag. This is
used if the Swept data measured on the specified channel is to be captured and returned
to the host controller when the instrument is next talked addressed. The return value is
defined as follows:
data(freq 1),data(freq 2),......,data(freq n)EOL
where:
freq 1 = start frequency
freq n = stop frequency
freq 2 = freq 1 + 2 *(freq 2 - freq 1)/(items-1)
items = an integer from 1 to 512 defined by the ITEMS modifier.
where a data item, data(freq x), is returned in the fixed form of
±
ddd.dd. The assumed
units for the data items is dBm if in absolute measurement mode or dB if in relative
measurement mode. The data returned represents the next full sweep (or n full sweeps if
an averaging factor of n is chosen). The Output command can capture and return data
(see the related verb OUTPUT section 3.3.19 for more information.) If the channel is
making a CW measurement and the data returned represents the measured data point,
the format is dataEOL.
Current Swept Measurement Syntax:
SWP[?] hs Channel Specifier [ ds Sensor Specifier] us [modifiers]..[modifiers]
Current Swept Measurement Specifiers:
Channel specifiers: 1, 2, 3, and 4
Sensor Specifiers: A, B, C, A/B, A/C, B/A, B/C, C/A, and C/B
Current Swept Measurement Modifiers:
Modifier Description: This modifier defines an average factor for the measure-
ment.
Modifier name: AVERAGE, AVG
Modifier Syntax 1: AVG ds numerical value or state
valid numerical values: 1, 2, 4, 8, 16, 32, 64, 128, 256
assumed units: no units
Modifier Syntax 2: AVG hs state
State definition: ON, +, OFF, -, RESET, RS
Modifier Description: This modifier defines the measurement to be made in
absolute power (dBm) units with the appropriate Cal
Factors applied.
If a non-valid numerical value is used, the valid value closest to the entered value is used.