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GW Instek GSP-930 User Manual

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Spectrum Analyzer
GSP-930
USER MANUAL
REVISION 1.1 APRIL 2012
ISO-9001 CERTIFIED MANUFACTURER
This manual contains proprietary information, which is protected by copyright. All rights are reserved. No part of this manual may be photocopied, reproduced or translated to another language without prior written consent of Good Will company.
The information in this manual was correct at the time of printing. However, Good Will continues to improve products and reserves the rights to change specification, equipment, and maintenance procedures at any time without notice.
Good Will Instrument Co., Ltd. No. 7-1, Jhongsing Rd., Tucheng Dist., New Taipei City 236, Taiwan.
SAFETY INSTRUCTIONS
Table of Contents
SAFETY INSTRUCTIONS .................................................. 3
GETTING STARTED .......................................................... 8
GSP-930 Introduction ............................ 9
Accessories .......................................... 11
Appearance .......................................... 13
First Use Instructions .......................... 24
BASIC OPERATION ........................................................ 36
Frequency Settings ............................... 39
Span Settings ....................................... 43
Amplitude Settings .............................. 46
Autoset ................................................ 59
Bandwidth/Average Settings ................ 61
Sweep .................................................. 66
Trace .................................................... 72
Trigger ................................................. 79
Marker ................................................. 84
Display................................................. 98
System Settings ................................. 105
Preset ................................................ 109
ADVANCED OPERATION ............................................... 111
Measurement ..................................... 112
Limit Line Testing .............................. 159
Sequence ........................................... 165
Tracking Generator ............................ 170
Power Meter ...................................... 173
FILE .............................................................................. 178
File Overview ..................................... 178
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GSP-930 User Manual
REMOTE CONTROL ...................................................... 194
Interface Configuration ...................... 195
FAQ .............................................................................. 205
APPENDIX .................................................................... 206
Replace the Clock Battery ................... 206
Glossary of Acronyms ........................ 207
GSP-930 Default Settings ................... 209
Menu Tree .......................................... 211
GSP-930 Specifications ...................... 240
GSP-930 Dimensions ......................... 249
Declaration of Conformity .................. 250
INDEX .......................................................................... 251
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SAFETY INSTRUCTIONS
WARNING
Warning: Identifies conditions or practices that could result in injury or loss of life.
CAUTION
Caution: Identifies conditions or practices that could result in damage to the instrument or to other properties.
DANGER High Voltage
Attention Refer to the Manual
Earth (ground) Terminal
Frame or Chassis Terminal
Do not dispose electronic equipment as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased.

SAFETY INSTRUCTIONS

This chapter contains important safety instructions that you must follow during operation and storage. Read the following before any operation to insure your safety and to keep the instrument in the best possible condition.

Safety Symbols

These safety symbols may appear in this manual or on the instrument.
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GSP-930 User Manual
General Guideline
CAUTION
Do not place any heavy object on the
instrument.
Avoid severe impact or rough handling that
leads to damaging the instrument.
Do not discharge static electricity to the
instrument.
Use only mating connectors, not bare wires, for
the terminals.
Ensure signals to the RF input do not exceed
+30dBm.
Ensure reverse power to the TG output terminal
does not exceed +30dBm.
Do not supply any input signals to the TG
output.
Do not block the cooling fan opening. Do not disassemble the instrument unless you
are qualified.
(Measurement categories) EN 61010-1:2010 specifies the measurement categories and their requirements as follows. The instrument falls under category II.
Measurement category IV is for measurement performed at the
source of low-voltage installation.
Measurement category III is for measurement performed in the
building installation.
Measurement category II is for measurement performed on the
circuits directly connected to the low voltage installation.
Measurement category I is for measurements performed on
circuits not directly connected to Mains.
Power Supply
WARNING
AC Input voltage range: 100V~240V Frequency: 50/60Hz To avoid electrical shock connect the protective
grounding conductor of the AC power cord to an earth ground.

Safety Guidelines

4
SAFETY INSTRUCTIONS
Battery
CAUTION
Rating: 10.8V, 6 cell Li-ion battery Turn off the power and remove the power cord
before installing or removing the battery.
Cleaning
Disconnect the power cord before cleaning. Use a soft cloth dampened in a solution of mild
detergent and water. Do not spray any liquid.
Do not use chemicals containing harsh material
such as benzene, toluene, xylene, and acetone.
Operation Environment
Location: Indoor, no direct sunlight, dust free,
almost non-conductive pollution (Note below)
Temperature: 5°C to 45°C Humidity: <90%
(Pollution Degree) EN 61010-1:2010 specifies the pollution degrees and their requirements as follows. The instrument falls under degree 2.
Pollution refers to “addition of foreign matter, solid, liquid, or
gaseous (ionized gases), that may produce a reduction of dielectric strength or surface resistivity”.
Pollution degree 1: No pollution or only dry, non-conductive
pollution occurs. The pollution has no influence.
Pollution degree 2: Normally only non-conductive pollution
occurs. Occasionally, however, a temporary conductivity caused by condensation must be expected.
Pollution degree 3: Conductive pollution occurs, or dry, non-
conductive pollution occurs which becomes conductive due to condensation which is expected. In such conditions, equipment is normally protected against exposure to direct sunlight, precipitation, and full wind pressure, but neither temperature nor humidity is controlled.
Storage environment
Location: Indoor Temperature: -20°C to 70°C Humidity: <90%
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GSP-930 User Manual
Disposal
Do not dispose this instrument as unsorted municipal waste. Please use a separate collection facility or contact the supplier from which this instrument was purchased. Please make sure discarded electrical waste is properly recycled to reduce environmental impact.
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SAFETY INSTRUCTIONS
Green/ Yellow:
Earth
Blue:
Neutral
Brown:
Live (Phase)

Power cord for the United Kingdom

When using the instrument in the United Kingdom, make sure the power cord meets the following safety instructions.
NOTE: This lead/appliance must only be wired by competent persons
WARNING: THIS APPLIANCE MUST BE EARTHED IMPORTANT: The wires in this lead are coloured in accordance with the following code:
As the colours of the wires in main leads may not correspond with the coloured marking identified in your plug/appliance, proceed as follows:
The wire which is coloured Green & Yellow must be connected to the Earth terminal marked with either the letter E, the earth symbol
or coloured Green/Green & Yellow.
The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black.
The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment or contact the supplier.
This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, a cable of 0.75mm2 should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used.
Any exposed wiring from a cable, plug or connection that is engaged in a live socket is extremely hazardous. If a cable or plug is deemed hazardous, turn off the mains power and remove the cable, any fuses and fuse assemblies. All hazardous wiring must be immediately destroyed and replaced in accordance to the above standard.
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GSP-930 User Manual
GSP-930 Introduction ....................................................... 9
Main Features .................................................................................................................9
Accessories..................................................................... 11
Package Contents ....................................................................................................... 12

GETTING STARTED

This chapter provides a brief overview of the GSP-930, the package contents, instructions for first time use and an introduction to the front panel, rear panel and GUI.
8
GETTING STARTED
Performance
9kHz~3GHz bandwidth 1Hz resolution Nominal RBW accuracy of 5% <750kHz, 8%
@>750kHz
Video bandwidth 1Hz~1MHz (10 steps) Amplitude measurement range: DANL~30dBm
(frequency dependent)
Input attenuation: 0 ~ 50dB Phase noise: < -88dBc/Hz@1GHz, 10kHz
Features
10%-step increments for RBW bandwidth Three display modes: Spectrum, Topographic
and Spectrographic
Split window display Built-in EMI filter Auto Wake-up Built-in preamplifier Gate sweep Marker Frequency counter Two operating modes: Spectrum and Power
Meter mode
SEM measurement ACPR measurement OCBW measurement

GSP-930 Introduction

The GSP-930 is the most advanced spectrum analyzer GW Instek has produced to date. The GSP-930 features a split window display to view data in spectrum, topographic or spectrographic views.

Main Features

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GSP-930 User Manual
Channel power measurement Demodulation analyzer Diverse marker functions and features with
Peak Table
Sequence function to automatically perform pre-
programmed sequential operations
Optional battery operation
Interface
8.4 color LCD (800600) On-screen menu icons DVI-I video output RS-232 with RTS/CTS hardware flow control USB 2.0 with support for USB TMC LAN TCP/IP with LXI support Optional GPIB/IEEE488 interface IF output @ 886MHz Headphone output REF (reference clock) input/output BNC ports Alarm/Open collector output BNC port Trigger/Gate input BNC ports RF N-type input port Tracking generator output DC +7V/500mA output SMB port
10
GETTING STARTED
Standard Accessories
Part number
Description Region dependant
User manual
Region dependant
Power cord
Options
Option number
Description
Opt1.
Tracking generator
Opt2.
Battery (11.1V/5200mAH Li-ion battery)
Opt3.
GPIB interface (IEEE 488 bus)
Optional Accessories
Part number
Description
PWS-06
USB Average Power Sensor (up to 6200 MHz;
-32 to 20 dBm)
GRA-415
6U Rack mount kit

Accessories

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GSP-930 User Manual
Opening the box
Contents (single unit)
Main unit
(may include optional GPIB, TG output)
Quick Start manual User Manual CD
Power cord x1 (region
dependent)
Optional battery pack Calibration certificate

Package Contents

Check the contents before using the GSP-930.
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GETTING STARTED
Frequency
Autoset
Amplitude
Span
BW/Avg
Display
Trace
Sweep
Meas
Trigger
Sequence
File
Recall
Save
Peak
Marker->
Marker
System
Mode
Preset
Search
Quick Save
Limit Line
7
4
1
0
8
5
2
9
6
3
/
Enter
BK SP
F 4
F 3
F 2
F 1
F 6
F 5
F 7
GSP-930
9 kHz 3 GHz
Spectrum Analyzer
LOCAL
RF INPUT 50
REV PWR +30dBm
TG OUTPUT 50
W W
500mA MAX.
DC 7V
OUTPUT +30dBm MAX.
MAX.DC ±50V MAX.DC ±50V
CONTROL FILE
MARKER STATE
LCD display
Main keys
Function keys
Control keys
Power key
File keys
State keys
Scroll wheel
Arrow keys
RF input terminal
DC power supply
Tracking generator output
Numeric, Enter and BK SP keys
USB A, Micro SD port
Marker keys
LCD display
800600 color LCD display. The display shows the soft keys for the current function, frequency, amplitude and marker information.
Function keys
F 1
~
F 7
The F1 to F7 function keys directly correspond to the soft keys on the right-hand side of display.
Main keys
Frequency
Sets the center frequency, start frequency, stop frequency, center frequency step and frequency offset values.

Appearance

GSP-930 Front Panel

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GSP-930 User Manual
Span
Sets the span, with options for full span, zero span and last span.
Amplitude
Sets the amplitude reference level, attenuation, pre-amplifier controls, scale and other options for attenuation and scale.
Autoset
Automatically searches the peak signal with maximum amplitude and displays it with appropriate horizontal and vertical scales.
Control keys
BW/Avg
Sets the resolution bandwidth, video bandwidth, average type and turns the EMI filter on/off.
Sweep
Sets the sweep time and gate time.
Trace
Sets traces and trace related functions.
Display
The Display key configures the windowing mode and basic display properties.
Meas
Accesses measurement options such as ACPR, OCBW, demodulation measurements, SEM, TOI and other advanced measurements.
Limit
Line
Sets and tests Pass/Fail limit lines.
Sequence
Access, set and edit program sequences.
14
GETTING STARTED
Trigger
Sets the triggering modes.
File
File
File utilities options
Quick
Save
The Quick Save utility allows you to save either the state, trace, screen limit line, correction or sequence with only a single press.
Save
Save the trace, state etc., and save options.
Recall
Recall the trace, state etc., and recall options.
Marker
Marker
Turns the Markers on/off and configures the markers.
Marker->
The Marker-> key positions the markers on the trace.
Peak
Search
Finds each maximum and minimum peak. Used with the Marker function.
State
Preset
LOCAL
The Preset key will restore the spectrum analyzer to the Factory or User-defined settings.
The Preset key will also return the instrument back to local control after it has been in remote control mode.
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GSP-930 User Manual
Mode
The Mode key sets the spectrum analyzer to either Spectrum or Power Meter mode.
System
The System key shows system information, settings and other system related functions.
Power key
Turns the instrument on/off.
Scroll wheel
Edit values, select listed items.
Arrow keys
Increment/decrement values (in steps), select listed items.
RF input terminal
RF INPUT 50
W
+30dBm MAX.
MAX.DC ±50V
RF input port. Accepts RF inputs.
Maximum input: +33dBm Input impedance: 50Ω Maximum DC voltage: ±50V N-type: female
DC power supply
500mA MAX.
DC 7V
OUTPUT
SMB port supplies power for optional accessories.
DC +7V 500mA Max.
16
GETTING STARTED
Numeric keypad
7 8 9
654
1 2 3
/
0
BK SP
Enter
The numeric keypad is used to enter vales and parameters. It is often used in conjunction with the arrow keys and scroll wheel.
TG output port
REV PWR +30dBm
TG OUTPUT 50
W
MAX.DC ±50V
The Tracking Generator (TG) output source.
N-type: female Input impedance: 50Ω Output power: -50dBm to 0dBm Maximum reversed power:
+30dBm
USB A, Micro SD
USB A port, Micro SD port for saving/recalling settings/files.
17

Rear Panel

AC 100 240V
50 60 Hz 82W MAX.
AC 100 240V
50 60 Hz 82W MAX.
USB-B, LAN port
FanDVI-I
port
IF OUT
TRIG IN/GATE
IN port
ALARM OUT/
OPEN
COLLECTOR
REF OUT Battery cover/
Optional battery pack
REF IN
RS232 port
GPIB port (optional)
Power socket
RS232
RS232 9 pin DSUB port.
IF OUT
SMA IF Out port.
DVI-I
DVI video out port. Supports SVGA (800X600) @ 60Hz.
Fan
Power Socket
Power Socket: 100~240V, 50/60Hz.
GSP-930 User Manual
18
GETTING STARTED
Battery pack
Voltage: 10.8V Capacity: 5200mAH
REF IN
BNC female reference input.
REF OUT
BNC female reference output: 10MHz, 50Ω impedance
Security Lock
ALARM OUT
BNC female open collector Alarm output.
TRIG IN/GATE IN
BNC female 3.3V CMOS trigger input/gated sweep input.
Phone
3.5mm stereo headphone jack (wired for mono operation)
USB B
USB B Device port. USB 1.1/2.0
LAN
RJ-45 10Base-T/100Base-Tx
19

Display

Scale and Reference level
Attenuation level
Date and time
Function menu
Marker information
Trigger settings
Pre-amp settings
Trace and Detection settings
Frequency/Bandwidth settings
Status icons
Sweep settings
Traces and waveforms
LXI icon
Entry / Message area
Reference level
Displays the reference level. For details, see page
46.
Attenuation
Displays the vertical scale (attenuation) of the input signal. For details, see page 47.
Date/Time
Displays the date and time. See page 106 for details.
Marker information
Displays marker information. For details see page
83.
LXI icon
This icon indicates the status of the LXI connection. For details, see page 196.
Function menu
Soft menu keys associated with the F1 to F7 function keys to the right of the display.
GSP-930 User Manual
20
GETTING STARTED
Sweep settings
Sweep icon that shows the sweep status. See page 66 for details.
Trigger settings
Trigger icon that shows the trigger status. See page 79 details.
Pre-amp settings
Pre-amplifier icon that shows the Pre-amplifier status. See from page 48 for details.
Trace and detection settings
Trace icon that shows the trace type and the detection mode used for each trace. See from page 72 for details.
Status Icons
Displays the interface status, power source status, and alarm status, etc. See the Status Icon Overview on page 22 for a list of the status icons.
Frequency/ Bandwidth settings
Displays the Start, Center and Stop frequencies, RBW, VBW, Span and Sweep settings.
Entry/Message area
This area is used to show system messages, errors and input values/parameters.
Trace and waveforms
Main display showing the input signals, traces (page 72), limit lines (159) and marker positions (83).
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GSP-930 User Manual
PreAmp
Indicates that the pre amplifier is on.
AC
Shown when running on AC power.
AC Charge
Shown when the AC power is charging the battery.
Alarm Off
Alarm buzzer output is currently off.
Alarm On
Alarm buzzer output is currently on.
Amplitude Offset
Indicates that the amplitude-shift is active. This icon appears when amplitude-related functions are used: Reference level offset Amplitude Correction Input Z = 75Ω Input Z cal >0
Battery indicator
~
Indicates the battery charge.
Bandwidth Indicator
Indicates that the RBW or VBW settings are in manual mode.
Average
Indicates that the Average function is active.

Status Icon Overview

22
GETTING STARTED
External Lock
Indicates that the system is now locked and refers to the external reference input signal
External Trigger
External trigger signal is being used.
Math
Trace math is being used.
Sequence Indicator
Shown when a sequence is running.
Sweep Indicator
Indicates that the sweep time is manually set.
Tracking generator
Indicates the tracking generator is turned on.
TG Normalization
Indicates that the tracking generator has been normalized.
Wake-up clock
Indicates that the wake-up clock is turned on.
USB
Indicates that a USB flash drive is inserted into the front panel and is recognized.
Micro SD
Indicates that a micro SD card is inserted into the front panel and is recognized.
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GSP-930 User Manual
Description
The GSP-930 has two adjustable rubber feet that can used to position the instrument into two preset orientations.
Upright Position
Tuck the feet under the bottom of the instrument to stand the instrument upright.
Leaning Position
Pull the feet back to have the instrument leaning back.

First Use Instructions

Use the procedures below when first using the GSP-930 to tilt the stand, insert the battery pack, power up the instrument, setting the internal clock, the wake-up clock, updating the firmware and restoring the default settings. Lastly, the Conventions sections will introduce you to the basic operating conventions used throughout the user manual.

Tilting the Stand

24
GETTING STARTED
Description
The GSP-930 has an optional battery pack. The battery should be inserted before power is connected to the AC power socket and before the unit is turned on.
Steps
1. Ensure the power is off and the AC power is
disconnected.
2. Remove the battery cover.
3. Insert the battery as shown in the diagram
below.
4. Replace the battery cover.
Display Icon
The battery icon is displayed when GSP­930 is running on battery power.
Insertion Diagram

Inserting the Battery Pack

25

Power UP

Steps
1. Insert the AC power cord into the power
socket.
2. The power button exterior will be lit blue to
indicate that the GSP-930 is in standby mode.
3. Press the power button to turn the GSP-930 on.
4. The power button will turn orange and the
GSP-930 will start to boot up.
Note
It takes approximately 1.5 minutes for the GSP-930 to fully startup.
GSP-930 User Manual
26

Power Down

Description
The GSP-930 has two methods to power down: Normal and Forced Power Down.
The normal power down method will save the system state and end any running processes. The state is saved for the next time the instrument is turned back on.
The forced power down method only does a minimum state save.
Normal Power Down
Press the power button. The system will automatically handle the power down procedure in the following order:
The system state is saved. Outstanding processes are closed in
sequence.
The LCD backlight is turned off. The system enters standby mode (the
power key changes from orange to blue).
Note
The process takes ~10 seconds.
Forced Power Down
Press and hold the power button for ~4 seconds until the system turns off and the power button turns blue.
Note
The forced down mode might cause the GSP­930 to perform a longer system check the next time it is powered up.
GETTING STARTED
27
GSP-930 User Manual
Description
The GSP-930 can be setup to power-up automatically using the Wakeup Clock function. This feature is useful to wake-up the instrument early and eliminate settling time.
System Date
Example: Set the System Date to March 1, 2012
1. Press
System
>Date/Time[F4]>Set
Date[F1]>Year[F1].
2. Press 2012>Enter[F1].
3. Press Month[F2]>3>Enter[F1].
4. Press Day[F3]>1>Enter[F1].
5. Press Return[F7].
Note
The System Date will be shown at the top of the display.
System Time
Example: Set the System Time to 9.00 AM
1. Press
System
>Date/Time[F4]>Set
Time[F2]>Hour[F1].
2. Press 9>Enter[F1].
3. Press Minute[F2]>0>Enter[F1].
4. Press Second[F3]>0>Enter[F1].
5. Press Return[F7].

Setting the Date, Time and Wake-Up Clock

28
GETTING STARTED
Note
The System Time will be shown at the top of the display.
System Wake-Up Clock
Example: Set the GSP-930 to wake up at 9.00 AM
1. Press
System
>Date/Time[F4]>Wake-Up
Clock[F3]>Clock[F1].
2. Press Clock[F1] to choose a clock (1 ~ 7).
3. Press State[F2] to turn the clock on/off.
4. Press Hour[F3]>9>Enter[F1].
5. Press Minute[F4]>0>Enter[F1].
6. Press [F5] and choose Rept. (Repeat) or Single.
7. Press Select Date[F6] and select a day.
8. Press Return[F7] to save the Wake-Up Clock
settings.
Note
The system time is kept with the CR2032 clock battery. If the system time/ wake up clock can no longer be set, please replace the clock battery. See page 206.
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GSP-930 User Manual
Description
The GSP-930 allows the firmware to be updated by end-users. Before using the GSP­930, please check the GW Instek website or ask your local distributor for the latest firmware.
System version
Before updating the firmware, please check the firmware version.
1. Press
System
>System Information[F1].
2. The firmware will be listed on the display.
Firmware: T. 1. 0. 0
3. Press any other key to exit out of the System
Information screen.
4. To upgrade the firmware, insert the new
firmware onto a USB flash drive or Micro SD card and put the drive/ card into the appropriate front panel port. The firmware files should be located in a directory named “gsp930”.
5. Press
System
>More 1/2[F7]>Upgrade[F3].

Firmware Update

30
GETTING STARTED
6. The spectrum analyzer will automatically find
the firmware on the USB flash drive and start to update the firmware. When finished, the message “Upgrade is finished” will be shown at the bottom of the screen followed by “Rebooting”.
Rebooting
7. The system will automatically restart after the
rebooting message.
Note
The upgrade process may take a few minutes.
Description
The factory default settings or user-defined presets can be easily restored using the Preset key on the front panel. By default, the factory default settings are restored with the Preset key.
For details on how to configure the preset settings, please see page 109.
Steps
1. Press
Preset
.
2. The spectrum analyzer will load the preset
settings.

Restoring Default Settings

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GSP-930 User Manual
Soft Menu keys
The F1 to F7 function keys on the right side of the display correspond directly to the soft­menu keys on their left.
Frequency
Autoset
Amplitude
Span
BW/Avg
Display
Trace
Sweep
Meas
Trigger
Sequence
File
Recall
Save
Peak
Marker->
Marker
System
Mode
Preset
Search
Quick Save
Limit
Line
7
4
1
0
8
5
2
9
6
3
/
Enter
BK SP
F 4
F 3
F 2
F 1
F 6
F 5
F 7
GSP-930
9 kHz 3 GHz
Spectrum Analyzer
LOCAL
RF INPUT 50
REV PWR +30dBm
TG OUTPUT 50
W W
500mA MAX.
DC 7V
OUTPUT +30dBm MAX.
MAX.DC ±50V MAX.DC ±50V
CONTROL FILE
MARKER STATE
Soft-menu keys
F1 ~ F7 function keys
Input Parameter Values
Selecting this type of menu key will allow you to enter a new value with the numeric keypad or increment/decrement the value using the scroll wheel.
Toggle State
Pressing this menu key will toggle the state.

Conventions

The following conventions are used throughout the user manual. Read the conventions below for a basic grasp of how to operate the GSP-930 menu system and front panel keys.
32
GETTING STARTED
Toggle State & Input Parameter
Pressing this menu key will allow you to toggle the state of the function between Auto and Man(ual) state. When in the Man state, the parameter value can be manually edited. Use the numeric keypad to enter the new value or use the scroll wheel to increment/decrement the current value.
Sub Menu
Pressing this menu key will enter a submenu.
Sub Menu to select parameter
Pressing this menu key will enter a submenu to select a parameter.
Active Function
Pressing this type of menu key will activate that function. The menu key will be highlighted to show it is the active function.
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GSP-930 User Manual
Parameter input
Numerical keypad
Scroll wheel
7
4
1
0
8
5
2
9
6
3
/
Enter
BK SP
Directional arrow keys
Backspace, Enter keys
Parameter values can be entered using the numeric keypad, the scroll wheel and occasionally with the arrow keys.
Using the numeric keypad
When prompted to enter a parameter, use the number keys (0~9), the decimal key (.) and the sign key (+/-) to enter a value. After a value has been entered, the soft-menu keys can be used to select the units.
The value of the parameter is shown at the bottom of the screen as it is edited.
Edited parameter
Span: 1.5
Back Space
Use the backspace key to delete the last character or number entered.
34
GETTING STARTED
Using the scroll wheel
Use the scroll wheel to alter the current value. Clockwise increases the value, anti-clockwise decreases the value.
Directional arrows
Use the directional arrows to select discrete parameters or to alter values by a coarser resolution than the scroll wheel. Left decreases the value, right increases the value.
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GSP-930 User Manual
Frequency Settings .......................................................... 39
Center Frequency ....................................................................................................... 39
Start and Stop Frequency .......................................................................................... 40
Center Frequency Step .............................................................................................. 41
Frequency Offset ........................................................................................................ 42
Span Settings ................................................................. 43
Span .............................................................................................................................. 43
Full Span ...................................................................................................................... 44
Zero Span .................................................................................................................... 44
Last Span ...................................................................................................................... 45
Amplitude Settings ......................................................... 46
Reference Level .......................................................................................................... 46
Attenuation .................................................................................................................. 47
Scale/Div ..................................................................................................................... 48
Scale Type .................................................................................................................... 48
View Scale .................................................................................................................... 49
Vertical Scale Units .................................................................................................... 50
Reference Level Offset .............................................................................................. 50
Amplitude Correction ................................................................................................ 51
Create a Correction Set ............................................................................... 52
Amplitude Correction On/Off .................................................................. 54
Delete Correction Set .................................................................................. 55
Save Correction Set To Memory ............................................................... 55
Recall Correction Set From Memory ........................................................ 56
Input Impedance ........................................................................................................ 56
Input Impedance Calibration ................................................................................... 57
Using the Built-in Pre-Amplifier ............................................................................. 57
Autoset ........................................................................... 59
Using Autoset ............................................................................................................. 59
Limiting the Autoset Vertical Search Range .......................................................... 60

BASIC OPERATION

36
BASIC OPERATION
Limiting the Autoset Horizontal Search Range .....................................................60
Bandwidth/Average Settings ........................................... 61
Resolution Bandwidth Setting (RBW) .....................................................................61
Video Bandwidth Settings (VBW) ...........................................................................62
VBW/RBW Ratio .......................................................................................................62
Average Trace ..............................................................................................................63
Average Type ...............................................................................................................65
EMI Filter .....................................................................................................................66
Sweep ............................................................................ 66
Sweep Time ..................................................................................................................66
Single Sweep .................................................................................................................67
Continuous Sweep ......................................................................................................68
Gated Sweep Overview ..............................................................................................68
Using the Gated Sweep Mode ..................................................................................70
Trace ............................................................................. 72
Selecting a Trace ..........................................................................................................72
Trace Math ...................................................................................................................74
Trace Detection Mode ...............................................................................................75
Trigger ........................................................................... 79
Selecting a Trigger Type .............................................................................................79
Free Run Mode ..............................................................................................79
Activate Video Trigger .................................................................................79
Activate External Trigger .............................................................................81
Selecting the Trigger Mode .......................................................................................82
Set the Trigger Delay Time .......................................................................................83
Marker ........................................................................... 84
Activating a Marker.....................................................................................................85
Activate a Normal Marker ...........................................................................85
Move Marker Manually ................................................................................86
Move Marker to Preset Locations ..............................................................86
Activate Delta Marker ..................................................................................87
Move Delta Marker(s)Manually ..................................................................88
Marker Functions ........................................................................................................89
Marker Noise .................................................................................................89
Frequency Counter .......................................................................................90
Move Marker to Trace ...............................................................................................91
Show Markers in Table ..............................................................................................92
Peak Search ..................................................................................................................93
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Move Marker to Peak .................................................................................. 93
Move Marker and Peak to Center ............................................................. 93
Search for Peaks ........................................................................................... 94
Peak Configuration ...................................................................................... 95
Peak Table ................................................................................................................... 96
Display ........................................................................... 98
Adjusting the LCD Brightness ................................................................................. 98
Turning the LCD Backlight Off .............................................................................. 98
Setting a Display Line (Reference Level Line) ...................................................... 99
Using the Video Out Port ......................................................................................... 99
Setting the Display Mode ........................................................................................ 100
Split Spectrum View ................................................................................................ 103
System Settings ............................................................ 105
System Information ................................................................................................. 105
Error Messages ......................................................................................................... 105
Set the System Language ......................................................................................... 106
Set the Date and Time ............................................................................................. 106
Using the Wake-Up Clock ...................................................................................... 107
Alarm Output ............................................................................................................ 108
Preset ........................................................................... 109
Using the Preset Key ............................................................................................... 109
Save the User Preset Settings ................................................................................. 109
Preset Type Settings ................................................................................................. 110
Power on Preset Settings ........................................................................................ 110
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BASIC OPERATION
Description
The center frequency function sets the center frequency and centers the display to the center frequency.
Operation
1. Press
Frequency
>Center[F1] and enter the
frequency and unit.
Range: Resolution: Default
0kHz~3GHz 1Hz
1.5GHz
Display

Center frequency

Set Center Frequency

Frequency Settings

Center Frequency
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GSP-930 User Manual
Description
The start/stop frequency function will set the start and stop frequency of the span.
Operation
1. To set the start frequency, press
Frequency
> Start
Freq[F2] and enter the frequency and unit.
2. To set the stop frequency, press
Frequency
> Stop
Freq[F3] and enter the frequency and unit.
Range: Resolution: Default Start frequency: Default Stop frequency:
0kHz~3GHz 1Hz 0Hz 3GHz
Display
Start Frequency
Start Frequency Stop Frequency
Stop Frequency
Note
The start and stop frequency can change when the span settings are used. The stop frequency must be set higher than the start frequency (for spans 0), otherwise the span will be automatically set to 100Hz.

Start and Stop Frequency

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Description
The CF Step function sets the step size of the center frequency when using the arrow keys.
When the arrow keys are used to alter the center frequency, each press will move the center frequency by the step size specified by the CF Step function.
In auto mode, the center frequency step size is equal to 10% (1 division) of the span.
Operation
1. Press
Frequency
> CF Step[F4] and set the CF Step to
Auto or Man.
2. If Man was selected, set the frequency and unit
of the center frequency step size.
Manual Range: Auto range:
100Hz~3GHz 1/10 of span frequency
Display
CF Step size

Center Frequency Step

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Description
The Freq Offset function allows you to add an offset to the Center, Start and Stop frequencies as well as the marker frequencies. The offset value does not affect displaying the trace on the display.
Operation
1. Press
Frequency
>Freq Offset[F5] and set the offset
value.
The Center, Start, Stop and Marker frequencies are updated accordingly.
Offset Range:
0Hz~100GHz
Display
Frequency
Offset

Frequency Offset

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Description
The Span function will set the frequency range of the sweep. The sweep will be centered around the center frequency.
Setting the span will alter the start and stop frequencies.
Operation
1. Press

Span

> Span[F1] and enter the span
frequency range and unit.
Range: Resolution: Default Span:
0kHz~3GHz 1Hz 3GHz
Display
Span
Set Span

Span Settings

Span
43

Full Span

Description
The Full Span function will set the span to the full frequency range.
This function will set the start and stop frequencies to 0Hz and 3GHz respectively.
Operation
1. Press
Span
> Full Span[F2].
Description
The Zero Span function will set the frequency range of the sweep to 0Hz and fixes the start and stop frequencies to the center frequency. The Zero Span function measures the time domain characteristics of the input signal at the center frequency. The horizontal axis is displayed in the time domain.
Operation
1. Press
Span
> Zero Span[F3].
The span changes accordingly.

Zero Span

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Display
Time domain
0Hz Span
Example: Amplitude modulation
Note
The measurement functions such as TOI, SEM, CNR, CTB, CSO, ACPR, OCBW, phase, Jitter and NdB are not available with the zero span setting:

Last Span

Description
The last span function returns the spectrum analyzer to the previous span settings.
Operation
1. Press
Span
> Last Span[F4].
BASIC OPERATION
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Description
The reference level defines the absolute level of the amplitude on the top graticule in voltage or power.
Operation
1. Press
Amplitude
> Ref Level[F1] and enter the
reference level amplitude and unit.
Range: Units: Resolution:
-120dBm ~ 30dBm dBm, W, V, dBmV, dBuV 1dBm
Display
Reference LevelRef Level reading

Amplitude Settings

The vertical display scale is defined by the reference level amplitude, attenuation, scale and external gain/loss.

Reference Level

46

Attenuation

Description
The attenuation of the input signal level can set to automatic (Auto) or manual (Man). When the attenuation is set to Man, the input attenuator can be changed manually in 1dB steps.
Operation
1. Press
Amplitude
> Attenuation[F2] and select Auto
or Man.
2. If Man was selected, enter the attenuation level
and unit.
Range: Units: Resolution:
0dBm ~ 50dBm dBm 1dB
Display
Attenuation level
BASIC OPERATION
47

Scale/Div

Description
Sets the logarithmic units for the vertical divisions when the scale is set to Log.
Operation
1. Press
Amplitude
> Scale/Div[F3] repeatedly to select
the vertical division units.
Unit Range:
10, 5, 2, 1
Display
Scale
Note
The Scale/Div function is only selectable when the scale is set to Log (logarithmic).
Description
Sets the vertical scale in linear or logarithmic units. By default the linear scale is set to volts and the logarithmic scale is set to dBm.
Operation
1. Press
Amplitude
> Scale Type[F4] and set the vertical
scale to Log or Lin.
Note
If the unit scale is changed (i.e. dBm → volts), the
displayed
vertical scale type will remain in the set
linear or logarithmic setting.
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Scale Type

48

View Scale

Description
The Scale function turns the vertical scale on/off. The value of each graticule division is displayed with same units used for the Ref Level settings.
Operation
1. Press
Amplitude
> Scale[F5] to toggle the Scale on or
off.
2. Press Scale Pos.[F6] to toggle the position of the
scale when on.
Scale position:
Left, Center, Right
Display
Scale
Left
The vertical scale is displayed on the left hand side by default.
BASIC OPERATION
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GSP-930 User Manual
Description
Change the vertical units for both linear or logarithmic scales.
Operation
1. Press
Amplitude
> More[F7]>Y Axis[F1] and then
choose the desired units.
2. The units are changed accordingly.
Units:
dBm, dBmV, dBuV, Watts, Volts
Description
The Reference Level Offset function sets an offset value to the reference level to compensate for any loss or gain from an external network or device. The offset value does not affect the input attenuation or the on-screen trace. This setting will change the reference level readout, the scale readout and the marker readout.
Operation
1. Press
Amplitude
> More[F7]>RefLvlOffset[F2] and set
the offset level and unit.
2. To remove the offset level, set the reference
offset to 0 dB.
Range:
0dB ~ 50dB
Display Icon
The AMP icon is displayed at the bottom of the screen.

Vertical Scale Units

Reference Level Offset

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BASIC OPERATION
Example:
Ref: 0dBm
Before reference level offset(offset: 0dB)
Ref: 10dBm
Reference level
offset: 10dB
After reference level offset (offset: 10dB)
Description
Amplitude correction adjusts the frequency response of the spectrum analyzer by altering the amplitudes at specified frequencies. This allows the spectrum analyzer to compensate for loss or gain from an external network or device at certain frequencies.
Range
Correction Sets:
5 sets of 30 points
Amplitude:
-40dB to +40dB
Amplitude Resolution:
0.1dB
Frequency:
9kHz to 3GHz
Frequency Resolution:
1Hz

Amplitude Correction

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GSP-930 User Manual
Display
Correction points
Original waveform
Corrected
output
Example: The diagram above shows how amplitude correction is used to compensate for any losses or gains at specific frequencies.
Description
The GSP-930 can create and edit up to 5 sets of correction points. The correction points and associated values are all tabulated for ease of use.
Operation
1. Press
Amplitude
> More[F7]>Correction[F3]>
Correction Set[F1] and choose a correction set to
edit/create.
Correction set:
1~5
Create a Correction Set
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BASIC OPERATION
2. Press Edit[F3].
The GSP-930 will split into two screens. The top screen will show the waveform and the bottom screen will provide an overview of the correction points.
Spectrum display
Correction points
Frequency of
selected point
3. Press Point Num[F1] and choose a point number
to edit.
Point Num:
1~30
4. Press Frequency[F2] and choose the frequency of
the selected point.
Press Gain Offset[F3] and choose the amplitude of the select point. The units will be the same as those used for the vertical scale.
The frequency of the point values displayed in the correction table on the bottom display.
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Correction Table
5. Repeat steps 2 to 4 for any other correction
points.
6. To delete the selected point, press Delete
Point[F6].
7. Press Return[F7]>Save Correction[F5] to save the
correction set.
Note
Note that the correction points are automatically sorted by frequency (low → high). The correction set must be saved before it can be turned on.
The frequency values
displayed
in the correction table are rounded down for display purposes only. The actual frequency for each point can be seen in the Frequency soft-key.
Description
Any one of the 5 correction sets can be turned on.
Activate Correction
1. Press
Amplitude
> More[F7]>Correction[F3]>
Correction Set[F1] and choose a correction set.
Correction Set:
1~5
2. Press Correction[F2] and toggle correction on.
Amplitude Correction On/Off
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BASIC OPERATION
Deactivate Correction
1. Press
Amplitude
> More[F7]>Correction[F3]>
Correction[F2] to turn correction back off.
Operation
1. Press
Amplitude
> More[F7]>Correction[F3]>
Correction Set[F1] and choose the correction set
to delete.
Correction Set:
1~5
2. Press Delete Correction[F6].
The selected correction set will be deleted.
Operation
1. Press
Save
> Save To[F1] and choose the save
location.
Location:
Register, Local, USB, SD
2. Press Type[F2]> Correction[F5].
3. Press Data Source[F3] and choose a correction.
Correction Set:
Correction 1~5
4. Press Save Now[F7].
5. The correction set will be saved to the selected
location. For more information on Save and Recall, please see page 170.
Delete Correction Set
Save Correction Set To Memory
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Operation
1. Press
Recall
> Recall[F1] and choose the recall
location:
Location:
Register, Local, USB, SD
2. Press Type[F2]> Correction[F5].
3. Press Destination[F3] and choose a correction
set.
Correction Set:
Correction 1~5
4. Press Recall Now[F4].
5. The current correction set will be recalled from
the selected location. For more information on Save and Recall, please see page 170.
Description
Sets the input impedance to 75Ω or 50Ω.
Operation
1. Press
Amplitude
> More[F7]>Input Z[F4] to toggle
the input impedance.
Range:
75Ω, 50Ω
Recall Correction Set From Memory

Input Impedance

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BASIC OPERATION
Description
When an external impedance converter module (optional accessory ADP-101) is used to convert the impedance of a device from 50Ω to 75Ω, some external loss can be induced. The Input Z Cal function can be used to compensate for these losses with an offset value.
Note
The Input Z Cal function is only available when the input impedance is set to 75Ω.
Operation
1. Press
Amplitude
> More[F7]>Input Z Cal[F5] and set
the impedance offset.
Range: Resolution:
0dB to +10dB 1dB
Display Icon
The AMP icon is displayed at the bottom of the screen when Input Z Cal0dB.
Description
The built-in pre-amplifier boosts weak input signals, such as EMI testing signals, to levels that are easy to handle, over the entire frequency range. The built-in pre-amplifier on the GSP-930 has a nominal gain of 20dB.
In the Auto setting, the pre-amplifier will be automatically turned on when the reference level is less than -30dBm. When the reference level is greater than -30dBm, the pre-amplifier is turned off.
The bypass setting turns the pre-amplifier off.

Input Impedance Calibration

Using the Built-in Pre-Amplifier

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Operation
1. Press
Amplitude
> More[F7]>Preamp[F6] to toggle
the Preamp state.
Range:
Auto, Bypass
Display Icon
The Pr-amp icon indicates that the pre amplifier is on.
Example:
Pr-amp icon
Note
When the pre-amplifier is on, the attenuator becomes fixed at 0dB (i.e. Attenuation = 0dB).
58
Operation
1. Press

Autoset

> Autoset[F1].
Autoset Range
Amplitude: Span:
-80dBm ~ +20dBm 100Hz ~ 3GHz
Example:
Before Autoset, preset state
After Autoset
BASIC OPERATION
Autoset
The Autoset function searches the peak signals in two stages (full span & 0Hz - 100MHz limited span), picks the signal peak with the maximum amplitude, and then shows it in the display.

Using Autoset

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GSP-930 User Manual
Note
RBW, VBW and sweep settings are reset to Auto when the Autoset function is used.
Description
You can set the amplitude floor so that the signals lower than the setting will be ignored by the Autoset search.
Operation
1. Press
Autoset
> Amp.Floor[F2] and switch the
range from Auto to Man.
2. Enter the amplitude limit and unit for the
Autoset search.
Range:
−80 to +20dBm
Note
See page 48 for setting the amplitude units.
Description
You can change the frequency span limit in the display to get a better view of the Autoset result. By default, the frequency span after Autoset is set at 3MHz.
Operation
1. Press
Autoset
> Span[F3] and switch the range
from Auto to Man.
2. Enter the span frequency for the Autoset
search.
Manual Range:
100Hz to 3GHz

Limiting the Autoset Vertical Search Range

Limiting the Autoset Horizontal Search Range

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Description
RBW (Resolution Bandwidth) defines the width of the IF (intermediate frequency) filter that is used to separate signal peaks from one another. The narrower the RBW, the greater the capability to separate signals at close frequencies. But it also makes the sweep time longer under specific frequency spans (the display is updated less frequently).
Operation
1. Press
BW/Avg
> RBW[F1] and set the RBW to
Auto or Man.
2. Set the resolution bandwidth and unit for Man
mode.
Mode: Frequency Range(3dB):
Frequency Range(6dB):
Auto, Man 10Hz~3kHz (1-3-10 step) 10kHz~1MHz (10% step) 200Hz, 9kHz, 120kHz
Display Icon
The BW icon is displayed at the bottom of the screen when the RBW is in Man mode.
Note
If the RBW settings have an asterisk (*), it indicates that the -6dB filters are used.

Bandwidth/Average Settings

BW/Avg key sets the resolution bandwidth (RBW), video bandwidth (VBW) and averaging functions. The resolution, sweep time, and averaging are in a trade-off relationship, so configuration should be done with care.

Resolution Bandwidth Setting (RBW)

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Description
VBW (Video Bandwidth) defines the smoothness of the trace on the display. Combined with RBW, VBW defines the ability to sort out the target signal from surrounding noise or adjacent peaks.
Operation
1. Press
BW/Avg
> VBW[F2] and set the VBW to
Auto or Man.
2. Set the video bandwidth and unit for Man
mode.
Mode: Frequency Range(3dB):
Auto, Man 1Hz~1MHz (1-3-10 step)
Display Icon
The BW icon is displayed at the bottom of the screen when the VBW is in Man mode.
Description
The VBW/RBW function is used to view the ratio between the video bandwidth and the resolution bandwidth.
The VBW/RBW ratio is altered by setting the RBW and or VBW settings, see page 61 & 62 respectively.
View VBW/RBW ratio
1. Press
BW/Avg
.
2. The ratio is displayed on the VBW/RBW[F3] soft
key.

Video Bandwidth Settings (VBW)

VBW/RBW Ratio

62
Display
VBW/RBW
Ratio
Tip
Signals that are masked by the noise floor level should have a ratio of less than 1 to smooth the noise out.
Signals with strong frequency components should use a ratio equal to or greater than 1.

Average Trace

Description
The Average function averages the trace for a user-defined number of times before it is displayed. This feature smoothes the noise level, but has the drawback of slowing down the display update rate.
Operation
1. Press
BW/Avg
> Average[F4] and toggle Average
on or off.
2. Set the number of averages.
Range: Default:
4 ~ 200 20
Display Icon
The AVG icon is displayed at the bottom of the screen when the Average function is on.
BASIC OPERATION
63
Example:
Average:Off
Average: On (20)
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64

Average Type

Description
The Average Type function determines how the GSP-930 determines the average value.
LOG Average: Averages the trace points on a logarithmic scale.
Volt Average: Averages the amplitudes of the trace points on a linear voltage scale.
Power Average: Averages the trace points on a logarithmic scale in watts.
Operation
1. Press
BW/Avg
> Average Type[F5] and choose the
average type.
Range:
Default:
LOG Power, Volt Average, Power Average LOG Power
BASIC OPERATION
65

EMI Filter

Description
The built-in EMI filter is used for specific measurement situations such as EMI average detection, where a higher level of sensitivity is required than the standard configuration. When turned on, the RBW is set to -6dB, indicated by an asterisk (*).
When any measurement functions are turned on (see page 111 for details), the EMI filter is automatically disabled. Conversely if the EMI filter is turned on, any measurement functions are turned off.
Operation
1. Press
BW/Avg
> EMI Filter[F6] and toggle EMI
filter on or off.
Description
Sweep time defines the length of time the
system takes to "sweep” the current frequency
span. Note, however, that sweep time and RBW/VBW are in a trade-off. Faster sweep times update the display more frequently but make RBW and VBW wider, reducing the capability to separate signals at close frequencies.

Sweep

GSP-930 User Manual
The GSP-930 has a number of sweep options including setting the sweep time and sweep mode(continuous, single). The GSP-930 also has gated sweep modes.

Sweep Time

66
Operation
1. Press
Sweep
> Sweep Time[F1] and toggle the
Sweep time to Auto or Man.
2. Set the sweep time for the Man mode.
Mode: Range:
Resolution:
Auto, Man 22ms ~ 1000s (span>0Hz) 50us ~ 1000s (span=0Hz) 10us
Display Icon
The SWT icon will be displayed at the bottom of the screen when in the sweep is in manual mode.

Single Sweep

Description
The single sweep function is used to perform a single sweep. When Sweep Single is pressed the GSP-930 will perform a single sweep and then stop.
Operation
1. Press
Sweep
> Sweep Single[F2] to put the
spectrum analyzer into single sweep mode.
2. Press Sweep Single[F2] again to perform a single
sweep.
Display Icon
The Sweep Single icon is displayed on the right-hand side of the screen when the sweep is in single mode.
Note
You must wait for the single sweep to finish before pressing the Single Sweep key again.
If a setting is changed whilst the spectrum analyzer is still sweeping, the single sweep will immediately start over.
BASIC OPERATION
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Description
The GSP-930 has two main sweeping modes: single and continuous. Use the continuous mode to have the sweep constantly updated.
Operation
1. Press
Sweep
> Sweep Cont[F3] to put the spectrum analyzer into continuous sweep mode.
Display Icon
The Sweep Cont icon is displayed on the right-hand side of the screen when the sweep is in continuous mode.
Note
The GSP-930 will now continuously sweep unless the mode is changed to single sweep mode or if the system is waiting for a trigger condition.
Description
The Gated Sweep mode allows a trigger signal to dictate when the spectrum analyzer can sweep. This mode is useful for characterizing signals that are pulsed on and off, such as RF burst transmissions or for measuring spurious noise levels between transmission bursts.
Overview
1. The trigger signal must be synchronized to the
period of the input signal (shown as RF burst below).
2. The start of the gate time is produced from the
positive or negative edge of the trigger signal + the delay time.
3. The end of the gate time is determined by the

Continuous Sweep

Gated Sweep Overview

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BASIC OPERATION
set gate length.
4. The gated sweep should not be positioned at
either end of the transmission.
Delay Length
Gate
Trigger
RF Burst
period
Example: The diagram above demonstrates the relationship between the input trigger, the input signal and the position of the gated sweep relative to the input signal.
Note
Please take into consideration RBW settling time. Setting the delay time too short may not leave enough time for the RBW filter to resolve.
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Connection
1. Connect a trigger signal (3.3v CMOS) to the
GATE IN port on the rear panel.
Trigger
Operation
1. Press
Sweep
> GateDelay[F5] and set the gate delay time.
2. Press
Sweep
> Gated Length[F6] and set the gate time length.
3. Press
Sweep
> Gated Sweep[F4] and turn the mode on.
Gate Delay: Gate Length:
0s ~ 1000s 10us ~ 1000s
Display Icon
The Sweep Gated icon is displayed when Gated Sweep is turned on.

Using the Gated Sweep Mode

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BASIC OPERATION
Example:
The example below shows the spectrum of an FSK modulated signal when gated sweep mode is off.
The example below shows the same signal with the gated sweep timed to sweep when only the desired frequency is output.
Gated sweep icon
Note
Gate Delay and Gate Length must first be set before Gated Sweep is turned on.
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Description
Each trace (1, 2, 3, 4) is represented by a different color. When activated, an icon for each trace color and function is shown to the left of the display. When a trace is selected, parameters can be set/edited from the trace menu.
Trace Color:
1: Yellow 2: Pink 3: Blue 4: Red
Trace Type
The type of trace used determines how the trace data is stored or manipulated before being displayed. The analyzer updates each trace according to the type of trace used.
Clear and Write
The GSP-930 continuously updates the display with each sweep.
Hold Max/ Hold Min
The maximum or minimum points are maintained for the selected trace. The trace points are updated each sweep if new maximum or minimum points are found.

Trace

The GSP-930 is able to set the parameters of up to 4 different trances on the display at once. Each trace is represented by a different color and is updated with each sweep.

Selecting a Trace

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BASIC OPERATION
View
View will hold the selected trace and stop updating the trace data for the selected trace. Pressing View[F4] will display the trace data that was cleared using the Blank[F5] key.
Blank
Clears the selected trace from the display and stores trace data. The trace data can be restored by pressing View[F4].
Display Icon
Clear & Write
Hold Max
View
Blank
Trace 1
Trace 2
Trace 3
Trace 4
Operation
1. Press
Trace
> Trace[F1] and choose the trace number.
Trace:
1, 2, 3, 4
2. Select the trace type:
Clear & Write[F2] Max Hold[F3] Min Hold[F4] View[F5] Blank[F6]
Note
Traces, 2, 3 and 4 are set to
Blank
by default.
73

Trace Math

Description
Performs trace math from two traces (TR1, TR2) and stores the result in the currently selected trace. It also performs trace shift.
Math functions
Power Diff
Subtracts the TR1 amplitude data from the TR2 amplitude data. The TR1 data TR2 data are converted to watts. The result is converted back to dBm.
Log Diff
Subtracts the TR1 amplitude data from the TR2 amplitude data and then adds a logarithmic reference. Both the TR1 and TR2 data is in dBm. The resultant trace of the subtraction is in dB. When the result is added to a logarithmic reference the resulting data is in dBm.
LOG Offset
Adds a reference to the TR1 trance
Operation
1. Press
Trace
> More[F1]>Trace Math[F1].
2. Press TR1[F1] and select the first trace source:
TR1:
Trace 2, Trace 3, Trace 4
3. Press TR2[F2] and select the second trace
source:
TR2:
Trace 2, Trace 3, Trace 4
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BASIC OPERATION
4. Select the trace math function:
PowerDiff[F3] LogDiff[F4] LogOffset[F5]
5. If LogDiff was selected, set the reference level
and unit.
LogDiff ref range: LogDiff ref units:
-120dBm ~ 30dBm dBm, W
6. If LogOffset was selected, set the offset level
and unit.
LogOffset range:
-50dB~+50dB
7. To turn trace math off, press the OFF[F6].
Display Icon
The Math icon is displayed when trace math is turned on.
Description
Each time the spectrum analyzer samples data for each point on the trace, a number of samples are usually taken for each point, known as a sample bucket. The actual value of each point is determined by the detector from the samples in each bucket.
Each selected trace, (1, 2, 3, 4), can use a different detection mode.

Trace Detection Mode

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Detection modes
Auto
Automatically chooses an appropriate mode based on the values of all the samples.
Normal
While the signal level is constantly increasing or decreasing, the positive peaks are detected. Otherwise, detecting mode switches between positive peak and negative peaks. Useful for picking up burst phenomenon while avoiding excessive noise.
Peak+
Detects positive peak signals by selecting the maximum peak value for each point from each bucket. This mode is useful for sinusoidal signals.
Peak-
Detects negative peak signals by selecting the lowest peak value for each point from each bucket. This mode is not recommended for amplitude measurement.
Sample
Randomly selects a value from the bucket sample. Useful for noise signals.
Average
Calculates the average of all the samples in the sample bucket.
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BASIC OPERATION
Auto Detector Selection Method
Below is a flow chart diagram showing the Detector selection for the Auto mode.
Is (trace) Average
on?
Are any traces set
to Max Hold?
Are any traces set
to Min Hold?
Is Average Type
set to Power?
AverageSample
Peak+
Peak-
Normal
Y
N
Y
N
Y
N
N
Y
Is Phase Jitter
measurement on?
Sample
Y
N
Are any windows
set to Topographic?
Peak+
Y
N
Detector
(Auto mode)
Operation
1. Press
Trace
> More[F7]>Detection[F2].
2. Select the trace detection mode for the selected
trace:
Auto[F1] Normal[F2] Peak+[F3] Peak-[F4] Sample[F5] Average[F6]
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3. The display will return the Trace menu.
Display Icon
Normal
Average icon
Peak+ icon
Peak - icon
Sample icon
Average icon
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BASIC OPERATION
Description
In free run mode all signals are captured and the trigger conditions are not used.
Free Run Mode
1. Press

Trigger

> Free Run[F1] to run in free mode.
Description
Sets the video trigger level for video signals. When the video signal voltage level exceeds* the video trigger level, a trigger signal will be generated. *for positive video edge
Trigger
The Trigger function sets the signal conditions upon which the spectrum analyzer triggers captured waveforms, including frequency, amplitude, and delay. An external trigger signal, instead of the default internal signal, may be used as required for special conditions.
The sections below can be used to skip to the relevant section:
Free Run Mode → from page 79 Activate Video Trigger → from page 79 Activate External Trigger → from page 81 Selecting Trigger Mode → from page 81 Set the Trigger Delay Time → page 83

Selecting a Trigger Type

Free Run Mode
Activate Video Trigger
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GSP-930 User Manual
Parameters
Video Edge:
Determines the polarity of the video trigger.
Positive: The signal voltage exceeds the video level at the trigger frequency.
Negative: The signal voltage is lower than the video level at the trigger frequency.
Video Level:
The trigger voltage level.
Trigger Frequency:
Sets the frequency to start triggering
Operation
1. Press
Trigger
>Trigger Condition[F2]>Video[F1]
2. Press Video Edge[F1] and choose the edge.
Range:
Positive, Negative
3. Press Video Level[F2] and set the video voltage
trigger level.
Trigger level:
(-120dBm to +30dBm) +Ref Level Offset
4. Press Trigger Freq[F3] and choose the frequency
at which the spectrum analyzer will check the triggering conditions.
Frequency:
0-3GHz+frequency offset
Note
Set the trigger back to Free Run to disable the video trigger.
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BASIC OPERATION
Description
The external trigger is used when an external trigger signal is input into the rear panel TRIG IN port. The external trigger signal can be configured as positive or negative edge.
Trigger: 3.3V, CMOS
Operation
1. Press
Trigger
>Trigger Condition[F2]>Ext.Edge[F2] and select the trigger edge:
Pos: Neg:
Positive edge Negative edge
2. Connect the external trigger signal to the rear
panel TRIG IN port.
Trigger
3. Press Action Now[F5] to activate the external
trigger.
4. The system will now wait the trigger conditions
to be matched before starting a sweep.
Display Icon
The EXT Trigger icon is displayed when the external trigger is activated.
Note
The trigger will revert back to the Free Run mode if any parameter settings are changed, such as the span or amplitude settings.
Activate External Trigger
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GSP-930 User Manual
Description
In free run mode all signals are captured and the trigger conditions are not used.
Modes
Normal:
The spectrum analyzer captures every signal that meets the trigger conditions.
Single:
The spectrum analyzer captures the first signal that meets the trigger conditions.
Continuous:
The spectrum analyzer captures the first signal that meets the trigger conditions then switches to free run mode thereafter.
Operation
1. Press
Trigger
> Trigger Mode[F3] to toggle the trigger mode:
Nor.: Sgl.: Cont.:
Normal Single Continuous
2. Press Action Now[F5] to manually start
triggering.

Selecting the Trigger Mode

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BASIC OPERATION
Description
Sets the delay time between when the analyzer triggers and when the analyzer begins to capture the signal.
Delay time range: 1ns to 1ks
Operation
1. Press
Trigger
>Trigger Delay[F4] and set the trigger delay time.
Delay range:
0~1000s

Set the Trigger Delay Time

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GSP-930 User Manual

Marker

A Marker shows the frequency and amplitude of a waveform point. The GSP-930 can activate up to 6 markers or marker pairs simultaneously as well as up to 10 peak markers in the marker table.
The marker table helps editing and viewing multiple markers in a single display.
A delta marker shows the frequency and amplitude differences between the reference marker.
The GSP-930 can automatically move a marker to various locations including the peak signal, center frequency, and start/stop frequency. Other marker operations regarding signal peaks are available in the Peak Search function.
Activating a Marker → from page 85 Move Marker Manually → from page 86 Move Marker to Preset Locations → from page 86 Activate Delta Marker → from page 87 Move Delta Marker(s)Manually → from page 88 Marker Functions → from page 89 Move Marker to Trace → from page 91 Show Markers in Table → from page 92 Peak Search → from page 93 Peak Configuration → from page 95 Peak Table → from page 96
84
BASIC OPERATION
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
Marker:
1~6
2. Press [F2] to turn the selected marker on.
3. Press Normal[F3] to set the selected marker to
the Normal type.
4. The display will show the marker on the trace
(centered by default) with the marker measurement at the top of the display.
Marker
Maker ID, Frequency, Amplitude

Activating a Marker

There are two basic marker types, normal markers and delta markers. Normal markers are used to measure the frequency/time or amplitude of a point on the trace. Delta markers are used to measure the difference between a reference point and a selected point on the trace.
Activate a Normal Marker
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GSP-930 User Manual
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Use the left/right arrow keys to
move the marker one grid division.
3. Use the scroll wheel to move the
marker in fine increments.
4. Alternatively, the numeric keypad
can be used to directly enter the frequency of the marker position.
7 8 9
654
1 2 3
/0
Description
The
Marker->
key is used to move the selected
marker to a number of preset positions.
Functions
Mkr>Center: Mkr>Start: Mkr>Stop: Mkr>CF Step: Mkr>Ref Lvl:
Move to center frequency. Move to start frequency. Move to stop frequency. Move to step frequency. Move to reference level amplitude.
Note
When the
Marker->
key is used, the span and other
settings may be automatically changed.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press
Marker->
and select a marker position:
Move Marker Manually
Move Marker to Preset Locations
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BASIC OPERATION
Mkr>Center[F1] Mkr>Start [F2] Mkr>Stop[F3] Mkr>CF Step[F4] Mkr>Ref Lvl[F5]
Description
Delta markers are marker pairs that measure the difference in frequency/time and amplitude between a reference marker and a delta marker.
When delta markers are activated, the reference and delta marker appear at the position of the selected marker, or in the center of the display if the selected marker has not yet be activated.
The marker measurement is located at the top
of the display, under the “normal marker”
measurement.
Delta Markers
Ref:
Reference marker, designated as 1.
Delta:
Delta marker, designated as Δ1.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press [F2] to turn the selected marker on.
3. Press Delta[F4]>Delta[F1] to set the selected
marker to the Delta type.
Activate Delta Marker
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GSP-930 User Manual
Move Delta or Reference Marker
1. Press
Marker
> Delta[F4]> Move[F2]>Move Ref[F2]
to move the reference marker.
2. Press
Marker
> Delta[F4]> Move[F2]>Move
Delta[F3] to move the Delta marker.
3. Move the selected marker in the same fashion
as a normal marker, see page 86
Move Both reference and delta marker
1. Press either Move Pair Span[F4] or Move Pair
Center[F5] to move both markers at the same
time.
Move Pair Span:
Sets the frequency span between both markers. The span can be positive or negative:
1
+spanΔ1
Δ1
-span1
Move Pair Center:
Moves both markers at the same time, keeping the span between both markers even throughout.
2. Move both markers in the same fashion as a
normal marker, see page 86
Move Delta Marker(s)Manually
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BASIC OPERATION
Description
The noise marker function calculates the average noise level over a bandwidth of 1Hz, referenced from the marker position.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press [F2] to turn the selected marker on.
3. Press Normal[F3] and then position the marker
to the desired location.
4. Press Function[F5]>Marker Noise and turn
Marker Noise on.
5. The display will show the noise level
measurement at the top of the screen in dBm/Hz.
Marker ID, Frequency, dBm/Hz
Marker

Marker Functions

Marker Noise
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GSP-930 User Manual
Description
The frequency counter function is used to make accurate frequency measurements.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press [F2] to turn the selected marker on.
3. Press Normal[F3] and then position the marker
to the desired location.
4. Press Function[F5]>Frequency Counter[F1] and
turn the counter function on.
5. Press Resolution[F2] and set the resolution:
Auto:
Automatically chooses the best resolution.
Man:
Allows the resolution to be manually set.
Man Range:
1Hz, 10Hz, 100Hz, 1kHz
6. The display will show the frequency
measurement at the top of the screen at the selected resolution.
Frequency
Marker
Frequency Counter
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BASIC OPERATION
Description
The Marker Trace function moves the selected marker to any of the currently active traces.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press [F2] to turn the selected marker on.
3. Press More 1/2[F7]>Marker Trace[F1] and choose
a trace to move the current marker to. Only active traces can be selected.
Auto[F1] Trace1[F2] Trace2[F3] Trace3[F4] Trace4[F5]
4. In the example below, marker 1 is set to Trace1
and marker 2 is set to Trace2.
Marker 1, Trace 1
Marker 2, Trace 2

Move Marker to Trace

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GSP-930 User Manual
Description
The GSP-930 has a Marker Table function to show all the active markers and measurements at once.
Operation
1. Press
Marker
> More 1/2[F7]>Marker Table[F2] and
turn the marker table on.
2. The display will split into two screens. The
bottom half will show the Marker Table with the marker ID(normal, reference or delta), trace, x-axis position (frequency/time) and the amplitude of the marker.
Marker Table

Show Markers in Table

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BASIC OPERATION
Description
The
Peak
Search
key is used to find trace peaks.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press
Peak
Search
>Peak Search[F1]. The marker will
move to the highest signal peak.
3. To continually search for the peak each sweep,
press,
Peak
Search
>More 1/2[F7]>Peak Track[F1] and
set Peak Track to on.
Description
The Center function moves the marker to the highest signal peak and moves the center frequency to that peak.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press
Peak
Search
>Mkr>Center[F2].
Note
The span will not be changed.

Peak Search

Move Marker to Peak
Move Marker and Peak to Center
93
Search for Peaks
Description
The
Peak
Search
key can be used to search for a
number of different peaks.
Peak Search
Next Peak:
Searches for next highest peak visible on the display.
Next Peak Right:
Searches for the next peak to the right of the marker.
Next Peak Left:
Searches for the next peak to the left of the marker.
Min Search:
Searches for the lowest peak.
Operation
1. Press
Marker
> Select Marker[F1] and select a
marker number.
2. Press
Peak
Search
and select the type of peak you
wish to find.
Example: Next Peak
GSP-930 User Manual
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BASIC OPERATION
Example: Next Peak Right
Example: Next Peak Left
Description
There are two peak search configuration options: Peak Excursion and Peak Threshold.
Peak Excursion:
Peak Excursion sets the minimum value above the peak threshold for which peaks will be detected.
Peak Configuration
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GSP-930 User Manual
Peak Threshold:
Peak threshold sets the minimum threshold level for the analyzer to detect peaks. Any value above the Peak Threshold + Peak Excursion will be detected as a peak.
Peak Threshold
Peak Excursion
1
Peak
detection area
Operation
1. Press
Peak
Search
>More 1/2[F7].
2. Press Peak Excursion[F2] to set the excursion
level.
3. Press Peak Threshold[F3] to set the peak
threshold.
Peak Excursion:
0~100dB
Peak Threshold:
-120dB~+30dB
Description
The Peak Table function will display all peaks (up to 10) that meet the peak configuration settings. The amplitude and frequency for each peak is listed.
Operation
1. Press
Peak
Search
>More 1/2[F7]>Peak Table[F5].

Peak Table

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BASIC OPERATION
2. Press Peak Sort[F2] and set the sorting type:
Freq:
Amp:
Sort by frequency in ascending order. Sort by amplitude in ascending order.
3. Press Peak Table[F1] to turn the peak table on.
4. The display splits in two. The bottom screen
shows the peak table with the peak marker ID, X-axis position and amplitude.
Peak Table
Peak markers
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GSP-930 User Manual
Description
The LCD brightness levels can be adjusted to three pre-set levels.
Operation
1. Press

Display

> LCD Brightness[F2] to toggle the display brightness:
Hi: Mid: Lo:
High brightness Medium brightness Low brightness
Description
The LCD backlight can be turned off to preserve power or to prolong the lifetime of the LCD display when not in use.
Operation
1. Press
Display
> LCD Backlight[F3] and turn the LCD backlight off.
2. When the backlight is off, press any function
key to turn the LCD backlight back on.
Display
The Display key configures the basic display settings as well as setting up the display mode (spectrum, spectrographic, topographic) and the split screen modes.

Adjusting the LCD Brightness

Turning the LCD Backlight Off

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