User Manual
Table Of Contents
- PSA Spectrum Analyzers User's and Programmer's Reference
- Table of Contents
- List of Commands
- 1 Using This Document
- 2 Instrument Functions: A - L
- 3 Instrument Functions: M - O
- 4 Instrument Functions: P - Z
- 4.1 Peak Search
- 4.2 Preset
- 4.3 Print
- 4.4 Print Setup
- 4.5 Save
- 4.6 SPAN / X Scale
- 4.7 SWEEP
- 4.8 System
- 4.8.1 Show Errors
- 4.8.2 Power On/Preset
- 4.8.3 Time/Date
- 4.8.4 Alignments
- 4.8.5 Config I/O
- 4.8.6 Reference
- 4.8.7 Show System
- 4.8.8 Show Hdwr
- 4.8.9 Color Palette
- 4.8.10 Diagnostics
- 4.8.11 Restore Sys Defaults
- 4.8.12 Licensing
- 4.8.13 Personality
- 4.8.14 Service
- 4.8.15 Keyboard Lock (Remote Command Only)
- 4.8.16 Remote Message
- 4.8.17 Remote Message Turned Off
- 4.8.18 Power On Elapsed Time (Remote Command Only)
- 4.8.19 SCPI Version Query (Remote Command Only)
- 4.9 Trace/View
- 4.10 Trig
- 5 One-Button Measurement Functions
- 5.1 MEASURE (Spectrum Analysis Mode)
- 5.1.1 Command Interactions: MEASure, CONFigure, FETCh, INITiate and READ
- 5.1.2 Meas Off
- 5.1.3 Channel Power
- 5.1.4 Occupied BW
- 5.1.5 Adjacent Channel Power—ACP
- 5.1.6 Multi-Carrier Power
- 5.1.7 Power Stat CCDF
- 5.1.8 Harmonic Distortion
- 5.1.9 Burst Power
- 5.1.10 Intermod (TOI)
- 5.1.11 Spurious Emissions
- 5.1.12 Spectrum Emission Mask
- 5.1.13 Current Measurement Query (Remote Command Only)
- 5.2 Meas Control
- 5.3 Mode Setup
- 5.4 Restart
- 5.5 Single
- 5.6 Meas Setup (Adjacent Channel Power—ACP)
- 5.7 Trace/View (ACP Measurement)
- 5.8 Meas Setup (Burst Power)
- 5.9 Trace/View (Burst Power)
- 5.10 Meas Setup (ComplementaryCumulativeDistributionFunction—CCDF)
- 5.11 Display (ComplementaryCumulativeDistributionFunction—CCDF)
- 5.12 SPAN X Scale
- 5.13 Marker (ComplementaryCumulativeDistributionFunction—CCDF)
- 5.14 Meas Setup (Channel Power—CHP)
- 5.15 Trace/View (Channel Power Measurement)
- 5.16 Meas Setup (Harmonic Distortion)
- 5.17 Trace/View (Harmonics)
- 5.18 Meas Setup (Intermod (TOI))
- 5.19 Meas Setup (Multi-Carrier Power—MCP)
- 5.20 Trace/View (Multi-Carrier Power Measurement)
- 5.21 Meas Setup (Occupied Bandwidth—OBW)
- 5.22 Meas Setup (Spectrum Emissions Mask—SEM)
- 5.23 Trace/View (Spectrum Emissions Mask)
- 5.24 Display (Spectrum Emissions Mask—SEM)
- 5.25 SPAN X Scale
- 5.26 Marker (Spectrum Emissions Mask—SEM)
- 5.27 Meas Setup (Spurious Emissions)
- One - Button Measurement Functions
- 5.1 MEASURE (Spectrum Analysis Mode)
- 6 Programming Fundamentals
- SCPI Language Basics
- Improving Measurement Speed
- Turn off the display updates.
- Use binary data format instead of ASCII
- Minimize the number of GPIB transactions.
- Avoid unnecessary use of *RST.
- Put ADC Ranging in Bypass for FFT Measurements
- Minimize DUT/instrument setup changes.
- Consider using LAN instead of GPIB.
- Using an Option Mode: Minimize the number of GPIB transactions.
- Using an Option Mode: Avoid automatic attenuator setting.
- Using an Option Mode: Optimize your GSM output RF spectrum switching measurement.
- Using an Option Mode: Avoid using RFBurst trigger for single burst signals.
- Using an Option Mode: When making power measurements on multiple bursts or slots, use CALCulate:D...
- Programming Command Compatibility Across Model Numbers and Across Modes
- Using the LAN to Control the Instrument
- Programming in C Using the VTL
- Overview of the GPIB Bus
- 7 Using the STATus System
- 8 Menu Maps: Spectrum Analysis
- Alpha Editor Keys, 1 of 2
- AMPLITUDE Y Scale Key, 1 of 2 (
- Auto Couple Key, 1 of 3 (
- BW/Avg Key (
- Det/Demod Key (
- Display Key, 1 of 2 (
- File Key, 1 of 6 (
- FREQUENCY Channel Key (
- Input/Output Key (
- Marker Key (
- menu map:marker to;marker to:menu map
- Marker Fctn Key (
- MODE Key (
- Peak Search Key (
- Preset Key (
- Print Setup Key (
- SPAN X Scale Key (
- SPAN X Scale Key for CCDF Measurement (
- Sweep Key (
- System Key, 1 of 4 (
- Trace/View Key (
- Trig Key (
- 9 Menu Maps: One-Button Measurement Functions
- One-Button Measurement Menu Maps
- MEASURE Key
- Meas Control Key
- Mode Setup Key
- Mode Setup Key (2 of 2)
- ACP Measurement: Meas Setup Key
- ACP Measurement: Trace/View Key
- Burst Power Measurement: Meas Setup Key
- Burst Power Measurement: Trace/View Key
- CCDF (Power Stat) Measurement: Meas Setup Key
- CCDF (Power Stat) Measurement: Trace/View Key
- CCDF (Power Stat) Measurement: Display Key
- CCDF (Power Stat) Measurement: Span X Scale Key
- CCDF (Power Stat) Measurement: Marker Key
- Channel Power Measurement: Meas Setup Key
- Channel Power Measurement: Trace/View Key
- Harmonic Distortion Measurement: Meas Setup Key
- Harmonic Distortion Measurement: Trace/View Key
- Intermod (TOI): Meas Setup Key
- Multi-Carrier Power Measurement: Meas Setup Key
- Multi-Carrier Power Measurement: Trace/View Key
- Occupied Bandwidth Measurement: Meas Setup Key
- Spectrum Emission Mask Measurement: Meas Setup Key
- Spectrum Emission Mask Measurement: Trace/View Key
- Spectrum Emission Mask Measurement: Display Key
- Spectrum Emission Mask Measurement: Span X Scale Key
- Spectrum Emission Mask Measurement: Marker Key
- Spurious Emissions Measurement: Meas Setup Key
- One-Button Measurement Menu Maps
- Index
Chapter 6 517
Programming Fundamentals
Improving Measurement Speed
Programming Fundamentals
• :CONF:WAV? turns on the waveform measurement
• :WAV:BAND 300khz sets a resolution bandwidth of 300 kHz
• :WAV:SWE:TIME 5ms sets a sweep time of 5 milliseconds
• :WAV:BAND:TYPE FLAT selects the flat filter type
• :WAV:DEC 4;DEC:STAT ON selects a decimation of 4 and turns on
decimation. This reduces the amount of data that needs to be sent
since the instrument hardware decimates (throws some away).
• :INIT to initiate a measurement and acquire the data
• CALC:DATA2:COMP? MEAN,25us,526us,579.6us,8 to return the
desired data
There are two versions of this command depending on your firmware
revision. Earlier revisions require the optional variables be entered in
terms of their position in the trace data array. Current instruments
allowthevariablestobeenteredintermsoftime.
For early firmware revisions you need to know the sample interval. In
the waveform measurement it is equal to the aperture value. Query
:WAVeform:APERture? to find the sample interval. (Note: the
WAV:APER? command always takes decimation into account.) The
sample interval (aperture value) is dependent on the settings for
resolution bandwidth, filter type, and decimation. See the following
table to see how these value relate.
The parameters for this GSM example are:
MEAN,9,197,1730 (or with later firmware:
MEAN,25us,526us,579.6us,8)
• MEAN calculates the mean of the measurement points indicated
• 9 is how many points you want to discard before you look at the data.
This allows you to skip over any “unsettled” values at the beginning
of the burst. You can calculate this start offset by
(25µs/sampleInterval)l
• 197 is the length of the data you want to use. This would be the
portion of the burst that you want to find the mean power over. You
can calculate this length by (526µs/sampleInterval)
• 1730 is how much data you have before you repeat the process. For
this example it’s the time between the start offset point on the burst
in the first slot (first frame) to the same spot on the burst in the first
slot (second frame). You can calculate this by
(576.9µs*N/sampleInterval) where N is the number of data items
that you want. In this case it is the number of slots in the frame,
N=8.)