R&S ZVAX24 User manual

R&S® ZVAX24
Extension Unit
Quick Start Guide
Quick Start Guide
(=<ÝãÌ)
1312.7985.62 ─ 03
Test & Measurement

This Quick Start Guide describes the "Extension Unit" R&S® ZVAX24, order no. 1311.2509K02, and the
following options:
●"Low Noise Preamplifier" R&S® ZVAX-B203, order no. 1311.2515.02
●"Port 2 Receiver Monitor Output" R&S® ZVAX-B210, order no. 1311.2521.02
●"Combiner" R&S® ZVAX-B211, order no. 1311.2538.02
●"Harmonic Filter Generator Port 1" R&S® ZVAX-B251, order no. 1311.2544.02
●"Harmonic Filter Receiver Port 2" R&S® ZVAX-B252, order no. 1311.2550.02
●"Harmonic Filter Generator Port 3" R&S® ZVAX-B253, order no. 1311.2567.02
●"Pulse Modulator Generator Port 1" R&S® ZVAX-B271, order no. 1311.2573.02
●"Pulse Modulator Receiver Port 2" R&S® ZVAX-B272, order no. 1311.2580.02
●"Pulse Modulator Generator Port 3" R&S® ZVAX-B273, order no. 1311.2596.02
●"High Power Coupler Port 1" R&S® ZVAX-B291, order no. 1311.2609.02
●"High Power Coupler Port 2" R&S® ZVAX-B292, order no. 1311.2615.02
© 2011 Rohde & Schwarz GmbH & Co. KG
Muehldorfstr. 15, 81671 Munich, Germany
Phone: [phone] - 0
Fax: [phone]
E-mail: [email protected]
Internet: http://www.rohde-schwarz.com
Printed in Germany – Subject to change – Data without tolerance limits is not binding.
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. KG.
Trade names are trademarks of the owners.
The following abbreviations are used throughout this guide: R&S® ZVAX24 is abbreviated as R&S ZVAX24. Options R&S® ZVAX-Bxxx
are abbreviated as R&S ZVAX-Bxxx. The vector network analyzer R&S® ZVA24 is abbreviated as R&S ZVA24.

Contents
R&S® ZVAX24
3Quick Start Guide 1312.7985.62 ─ 03
Contents
1Safety Instructions.................................................................................5
2Preparing the Extension Unit for Use..................................................7
2.1 Front Panel Tour...........................................................................................................7
2.1.1 Standby Key....................................................................................................................7
2.1.2 USB Connectors.............................................................................................................7
2.1.3 RF Connectors................................................................................................................8
2.2 Rear Panel Tour...........................................................................................................13
2.2.1 Mains Connector and Switch........................................................................................13
2.2.2 USB FROM NWA..........................................................................................................13
2.2.3 Master USB Connectors...............................................................................................14
2.2.4 FILTER CONTROL IN...................................................................................................14
2.2.5 PORT 1 / 2 / 3 SOURCE...............................................................................................14
2.2.6 CASCADE IN................................................................................................................14
2.2.7 EXT PULSE GENERATOR IN / OUT...........................................................................15
2.3 Putting the Extension Unit into Operation................................................................15
2.3.1 Unpacking the Extension Unit.......................................................................................15
2.3.2 Instrument Setup...........................................................................................................16
2.3.3 Bench Top Operation....................................................................................................16
2.3.4 Mounting the Extension Unit in a 19'' Rack...................................................................17
2.3.5 EMI Protective Measures..............................................................................................18
2.3.6 Connecting the Extension Unit to the AC Supply..........................................................18
2.3.7 Power on and off...........................................................................................................18
2.3.8 Standby and Ready State.............................................................................................18
2.3.9 Replacing Fuses...........................................................................................................19
2.4 Maintenance................................................................................................................19
2.5 Storing and Packing...................................................................................................20
3Pulse Profile Measurement.................................................................21
3.1 Required Equipment...................................................................................................21
3.2 Measurement Principle...............................................................................................21
3.3 Connecting the Extension Unit..................................................................................22
3.4 ZVAX Path Configuration...........................................................................................23

Contents
R&S® ZVAX24
4Quick Start Guide 1312.7985.62 ─ 03
3.5 Pulse Generator Signals.............................................................................................24
3.6 Pulse Profile Mode......................................................................................................26
3.7 Calibration...................................................................................................................26
3.8 Measurement...............................................................................................................26
3.9 Possible Extensions...................................................................................................27
3.10 Additional Information................................................................................................28
4Overview of R&S ZVAX24 Options.....................................................29
Index......................................................................................................30

Safety Instructions
R&S® ZVAX24
5Quick Start Guide 1312.7985.62 ─ 03
1 Safety Instructions
This R&S ZVAX24 extension unit has been designed and tested in accordance with the
EC Certificate of Conformity and has left the manufacturer’s plant in a condition fully
complying with safety standards.
General safety instructions
To maintain this condition and to ensure safe operation, you must observe all instructions
and warnings given in this Quick Start Guide: Please notice in particular the instructions
below on this page and in chapter 2.
RF Connection
The extension unit is intended to be operated with an R&S ZVA24 network analyzer. The
maximum RF input powers of the extension unit are beyond the RF output power range
of the R&S ZVA24, so there is no risk of damage if it is connected to the test ports with
no external amplifiers or other active devices in the test setup. Notice, however, the
following items:
●Always connect the extension unit as described in chapter 2.1.3, "RF Connectors",
on page 8.
●The "High Power Coupler Port 1 / 2" options (R&S ZVAX24-B91 / -B92) extend the
source power range at port 1 and the receiver power range at port 2. External ampli-
fiers may be used to boost the RF powers. Notice the maximum RF powers of the
extension unit and the network analyzer quoted in the data sheets. Moreover, observe
that maximum RF powers are allowed only if the following conditions are fulfilled:
– The quoted power handling capability refers to the couplers only. In order to pre-
vent damage to other components of the extension unit and/or the network ana-
lyzer, the use of external attenuators and/or isolators may be necessary.
– None of the options R&S ZVAX-B203, "Low Noise Preamplifier", R&S ZVAX-
B252, "Harmonic Filter Source Port 2", and R&S ZVAX-B272, "Pulse Modulator
Source Port 2", is switched into the RF signal path of port 2.
– The signal fed in at the 3.5 mm test port connectors of the high power couplers
must not contain a DC offset, as this may impair the measurements and even
cause damage to the extension unit.
●Observe the maximum nominal input power of the "Low Noise Preamplifier" quoted
in the R&S ZVAX24 data sheet.
ESD Protective Measures
To protect the extension unit against damage due to Electrostatic Discharge (ESD) use
the wrist strap and grounding cord supplied with the network analyzer and connect your-
self to the GND connector at the front panel. For details refer to the Quick Start Guide of
your analyzer.

Safety Instructions
R&S® ZVAX24
6Quick Start Guide 1312.7985.62 ─ 03
USB Connection to the Analyzer
●The extension unit is intended for direct connection to R&S ZVA24 network analyzers
according to the instructions in chapter 2.2.2, "USB FROM NWA", on page 13 and
in the analyzer’s help system. Do not connect the unit to other USB hosts, e.g. a PC,
or insert any USB hubs between the analyzer and the unit, as this may cause damage
to the unit or the host.
●It is safe to connect or disconnect the extension unit while the network analyzer is
operating. Never connect the unit during a firmware update.

Preparing the Extension Unit for Use
R&S® ZVAX24
7Quick Start Guide 1312.7985.62 ─ 03
2 Preparing the Extension Unit for Use
This chapter gives an overview of the front panel controls and connectors of the
R&S ZVAX24 extension unit and gives all information that is necessary to put the unit
into operation and connect it to the network analyzer.
Chapter 3, Pulse Profile Measurement outlines a typical application example for the
extension unit (pulse profile measurement). Chapter 4, Overview of R&S ZVAX24
Options describes the available options and their use. For further information including
remote control reference refer to the online help system of your network analyzer or its
printed/printable version delivered on CD-ROM.
2.1 Front Panel Tour
The front panel of the extension unit provides the standby key, two type A USB connec-
tors, and RF connectors for ports 1, 2, and 3.
2.1.1 Standby Key
The standby key connects/disconnects all internal modules of the extension unit to/from
the DC supply voltages generated by its internal power supply.
The two LEDs indicate whether the extension unit is ready to operate (green LED on) or
in standby state (yellow LED on).
It is recommendable to switch the extension unit to standby state or switch it off by the
rear panel AC power switch if it is not used for some time.
2.1.2 USB Connectors
The USB connectors of type A (master USB) may be used to connect e.g. a calibration
unit, a keyboard, mouse or other pointing devices, a printer or an external storage device
(USB stick, CD-ROM drive etc.). A second pair of equivalent USB connectors is located
on the rear panel of the extension unit.
Front Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
8Quick Start Guide 1312.7985.62 ─ 03
When the extension unit is connected to the network analyzer via the type B USB con-
nector on the rear panel of the extension unit, the USB connectors on the front and rear
panel of the extension unit are functionally equivalent to those of the network analyzer.
For the USB connection between the two instruments, see also chapter 2.2.2, "USB
FROM NWA", on page 13.
The length of the connecting USB cables should not exceed 1 m. The maximum current
per USB port is 500 mA.
2.1.3 RF Connectors
The extension unit provides three groups of RF connectors that are located in color-coded
areas on the front panel. The colors indicate the corresponding network analyzer ports
that are modified in their functionality.
An RF connection to any of the network analyzer ports requires option R&S ZVA24-B16,
"Direct Generator/Receiver Access" on the analyzer side.
RF emissions
To comply with the emission requirements, always use semirigid cables (preferably, the
cables supplied by Rohde & Schwarz) to connect the extension unit to the network ana-
lyzer. Use double-shielded measurement cables for connections to the 3.5 mm test port
connectors PORT 1 and PORT 2 and the MONITOR output.
2.1.3.1 RF Connectors Port 1
The Port 1 connectors allow components inside the extension unit to be looped into the
RF signal path of the network analyzer (NWA) test port 1. The connectors must be con-
nected to the corresponding connectors provided by the NWA option R&S ZVA24-B16
(see chapter 2.1.3.4, "Rules for RF Connections", on page 12).
The following connectors are available:
●Two 2.92 mm connectors SOURCE IN and SOURCE OUT. To modify the source
signal from analyzer port 1, connect the 2.92 mm connectors as follows:
Front Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
9Quick Start Guide 1312.7985.62 ─ 03
– SOURCE IN (ZVAX) to SOURCE OUT (NWA)
– SOURCE OUT (ZVAX) to SOURCE IN (NWA)
This type of connection is used in the application example of chapter 3, "Pulse Profile
Measurement", on page 21.
●Option R&S ZVAX-B291, "High Power Coupler Port 1", provides two additional 2.92
mm connectors labeled REF OUT and MEAS OUT plus a 3.5 mm test port connector
PORT 1. The SOURCE OUT connector is not installed. This option extends the
source power range to values up to 20 W (+43 dBm) at the PORT 1 connector. The
"High Power Coupler Port 1" replaces the internal coupler at the network analyzer
port 1. The PORT 1 connector replaces the respective test port connector of the
network analyzer. To provide a high-power RF source signal at the PORT 1 connector
and measure the input signal at PORT 1, connect the extension unit as follows:
– SOURCE IN (ZVAX) to SOURCE OUT (NWA). To boost the NWA source power,
loop an external amplifier into the source signal path using the PORT 1
SOURCE 2.92 mm connectors on the rear panel.
– REF OUT (ZVAX) to REF IN (NWA). It may be necessary to loop an external
attenuator (at least 33 dB for 43 dBm max power) into this connection.
– MEAS OUT (ZVAX) to MEAS IN (NWA). It may be necessary to loop an external
attenuator (at least 33 dB for 43 dBm max power) into this connection.
– 3.5 mm test port connector (ZVAX) to the input of the DUT
In the figure below, red lines denote signal paths where the power may exceed the max-
imum input power of the network analyzer.
Fig. 2-1: Connection of PORT 1 for high source powers
Front Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
10Quick Start Guide 1312.7985.62 ─ 03
Maximum RF power and DC offset
Please observe the maximum RF output power at PORT 1 of the extension unit and the
maximum RF input power at the network analyzer ports (see data sheets). If the DUT
provides a high input power at the 3.5 mm test port connector of the extension unit,
external attenuators may be needed to prevent excess input power at REF IN and MEAS
IN (NWA).
In addition, it is important that the signal fed in at the 3.5 mm test port connector contains
no DC offset, as this may impair the measurements and even cause damage to the
extension unit.
2.1.3.2 RF Connectors Port 2
The Port 2 connectors allow components inside the extension unit to be looped into the
RF signal path of the network analyzer (NWA) test port 2. The connectors must be con-
nected to the corresponding connectors provided by the NWA option R&S ZVA24-B16
(see chapter 2.1.3.4, "Rules for RF Connections", on page 12).
The following connectors are available:
●Two 2.92 mm connectors MEAS IN and MEAS OUT. To modify the test signal mea-
sured at analyzer port 2, connect the 2.92 mm connectors as follows:
– MEAS IN (ZVAX) to MEAS OUT (NWA)
– MEAS OUT (ZVAX) to MEAS IN (NWA)
●A 2.92 mm MONITOR connector. This connector is intended e.g. for an external
spectrum analyzer used to monitor the measured signal.
●Option R&S ZVAX-B292, "High Power Coupler Port 2", provides two additional 2.92
mm connectors labeled SOURCE IN and REF OUT plus a 3.5 mm test port connector
PORT 2. The MEAS IN connector is not installed. This option extends the receiver
power range to values up to 20 W (+43 dBm) at the PORT 2 connector. The "High
Power Coupler Port 2" replaces the internal coupler at the network analyzer port 2.
The PORT 2 connector replaces the respective test port connector of the network
analyzer. To provide an RF source signal at the PORT 2 connector and measure a
high-power input signal at PORT 2, connect the extension unit as follows:
– SOURCE IN (ZVAX) to SOURCE OUT (NWA). It may be necessary to loop an
external isolator with high power termination into this connection in order to pre-
vent the port 2 source of the NWA from being damaged.
Front Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
11Quick Start Guide 1312.7985.62 ─ 03
– REF OUT (ZVAX) to REF IN (NWA). It may be necessary to loop an external
attenuator (at least 33 dB for 43 dBm max power) into this connection.
– MEAS OUT (ZVAX) to MEAS IN (NWA). It may be necessary to loop an external
attenuator (at least 33 dB for 43 dBm max power) into this connection.
– 3.5 mm connector (ZVAX) to the output of the DUT
In the figure below, red lines denote signal paths where the power may exceed the max-
imum input power of the network analyzer.
Fig. 2-2: Connection of PORT 2 for high receiver powers
Maximum RF power and DC offset
An input power of +43 dBm is allowed only if none of the options R&S ZVAX-B203, "Low
Noise Preamplifier", R&S ZVAX-B252, "Harmonic Filter Source Port 2", and R&S ZVAX-
B272, "Pulse Modulator Source Port 2", is switched into the RF measurement signal path
of port 2. Refer to the data sheet of your network analyzer.
Please observe the maximum RF output power at PORT 1 and the maximum RF input
power at the network analyzer ports (see data sheet). If the DUT provides a high input
power at the 3.5 mm test port connector of the extension unit, external attenuators may
be needed to prevent an excess input power at REF IN and MEAS IN (NWA).
In addition, it is important that the signal fed in at the 3.5 mm test port connector contains
no DC offset, as this may impair the measurements and even cause damage to the R&S
ZVA port 2 source.
Front Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
12Quick Start Guide 1312.7985.62 ─ 03
Input and output power of option R&S ZVAX-B203, "Low Noise Preamplifier"
The power gain of the low noise preamplifier is >30 dB. Its maximum output power is
below the damage level of the network analyzer ports.
Please observe the maximum input power of the preamplifier quoted in the R&S ZVAX24
data sheet. Never use the preamplifier in combination with the high power coupler and
high input powers at PORT 2 (see Connection of PORT 2 for high receiver powers).
2.1.3.3 RF Connectors Port 3
The Port 3 connectors allow components inside the extension unit to be looped into the
RF signal path of the network analyzer (NWA) test port 3. The connectors must be con-
nected to the corresponding connectors provided by the NWA option R&S ZVA24-B16
(see chapter 2.1.3.4, "Rules for RF Connections", on page 12).
To modify the source signal at analyzer port 3, connect the 2.92 mm connectors as fol-
lows:
●SOURCE IN (ZVAX) to SOURCE OUT (NWA). If needed, connect an external ampli-
fier to the PORT 3 SOURCE 2.92 mm connectors on the rear panel to boost the
source power.
●SOURCE OUT (ZVAX) to SOURCE IN (NWA)
2.1.3.4 Rules for RF Connections
The following rules simplify the RF connection between the extension unit and the net-
work analyzer (NWA):
●The DUT is connected to the NWA test port connectors (3.5 mm). If a high power
coupler is installed at port 1 or port 2 of the extension unit, the test port connector of
the coupler replaces the NWA test port connector.
●The 2.92 mm connectors labeled SOURCE of the extension unit are connected to
the NWA SOURCE connectors. The same applies to the REF and MEAS connectors.
●XXX OUT connectors of the extension unit (where XXX denotes SOURCE, REF, or
MEAS) are connected to XXX IN connectors of the NWA and vice versa.
●If no external components (attenuators, isolators) are looped into the connection, the
semirigid jumper cables provided along with the extension unit can be used for all
front panel connections between NWA and R&S ZVAX24.
Front Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
13Quick Start Guide 1312.7985.62 ─ 03
2.2 Rear Panel Tour
The rear panel contains the mains connector with the AC power switch and a fuse holder
and several connectors for control and RF signals.
2.2.1 Mains Connector and Switch
The mains connector is located in the lefthand part of the rear panel; see also chap-
ter 2.3.7, "Power on and off", on page 18.
2.2.2 USB FROM NWA
The type B USB connector (slave USB) is used to control the extension unit from an R&S
ZVA24 vector network analyzer. Connect the USB FROM NWA connector to any of the
type A USB connectors at the front or rear panel of the analyzer.
A USB control connection is a prerequisite for accessing the ZVAX Path Configuration
dialog; see chapter 3.4, "ZVAX Path Configuration", on page 23.
With an established connection to USB FROM NWA, the type A USB connectors of the
extension unit are functionally equivalent to those of the NWA.
USB connection
The length of the connecting USB cable should not exceed 1 m. It is recommended to
use the cable delivered with the extension unit.
Rear Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
14Quick Start Guide 1312.7985.62 ─ 03
2.2.3 Master USB Connectors
Two type A USB connectors (master USB), equivalent to the master USB connectors on
the front panel; see chapter 2.1.2, "USB Connectors", on page 7.
2.2.4 FILTER CONTROL IN
For future extensions.
2.2.5 PORT 1 / 2 / 3 SOURCE
Three pairs of 2.92 mm connectors used to loop external components, e.g. amplifiers,
into the source signal paths of test ports 1, 2, and 3. The source signal path of test port
2 does not contain any additional modules; see figure 3-2.
RF emissions
To comply with the emission requirements, always use semirigid cables (preferably, the
cables supplied with the extension unit) to connect external components or close the
OUT/IN loops.
2.2.6 CASCADE IN
Input connector for pulse generator signals from the R&S ZVA24 network analyzer (with
option R&S ZVA-K27). The two pulse generator signals control the pulse modulators in
the extension unit (options R&S ZVAX-B271, R&S ZVAX-B272, R&S ZVAX-B273). Refer
to the detailed description of the pulse generator in the help system of your network
analyzer.
The pulse modulators are controlled either via the CASCADE IN or via the EXT PULSE
GENERATOR IN connectors; see figure 3-3 on page 24. The pulse generator signals
are also fed to the PULSE GENERATOR OUT connectors. See chapter 2.2.7, "EXT
PULSE GENERATOR IN / OUT", on page 15.
Rear Panel Tour

Preparing the Extension Unit for Use
R&S® ZVAX24
15Quick Start Guide 1312.7985.62 ─ 03
2.2.7 EXT PULSE GENERATOR IN / OUT
Input connector for pulse generator signals from external pulse generators. The two pulse
generator signals labeled 1 and 2 can be set to control the pulse modulators in the exten-
sion unit (options R&S ZVAX-B271, R&S ZVAX-B272, R&S ZVAX-B273).
The pulse generator signals from the CASCADE IN or the EXT PULSE GENERATOR
IN inputs can be fed to the PULSE GENERATOR OUT connectors; see figure 3-3 on
page 24.
The pulse modulators are controlled either via the EXT PULSE GENERATOR IN or via
the CASCADE IN connector. See chapter 2.2.6, "CASCADE IN", on page 14.
The pulse PULSE GENERATOR OUT signals are also compatible with external pulse
generators with a 50 Ω load impedance.
2.3 Putting the Extension Unit into Operation
This section describes the basic steps to be taken when setting up the extension unit for
the first time.
Risk of instrument damage
Before switching on the instrument, make sure that the following conditions are met:
●Instrument casing is in place and all fasteners are tightened.
●All fan openings are unobstructed and the airflow perforations are unimpeded. The
minimum distance from the wall is 10 cm.
●The instrument is dry and shows no sign of condensation.
●The instrument is operated in the horizontal position on an even surface.
●The ambient temperature does not exceed the range specified in the data sheet.
●Signal levels at the input connectors are all within the specified ranges.
Failure to meet these conditions may cause damage to the instrument or other devices
in the test setup.
2.3.1 Unpacking the Extension Unit
The extension unit is shipped together with its mandatory accessories in a cardboard box.
Putting the Extension Unit into Operation

Preparing the Extension Unit for Use
R&S® ZVAX24
16Quick Start Guide 1312.7985.62 ─ 03
In order to unpack its contents proceed as follows:
1. Remove the unit from its packaging and check the equipment for completeness using
the delivery note and the accessory lists for the various items.
2. First, pull off the polyethylene protection pads from the unit's rear feet and then care-
fully remove the pads from the unit handles at the front.
3. Pull off the corrugated cardboard cover that protects the rear of the unit.
4. Carefully unthread the cardboard cover at the front that protects the unit handles and
remove it.
5. Check the unit for damage. If you notice any damage, immediately contact the carrier
who delivered the unit. In this case, make sure not to discard the box and packing
material.
It is advisable to keep the original packing material in order to protect the control elements
and connectors in case the unit is to be transported or shipped at a later date.
2.3.2 Instrument Setup
The extension unit is designed for use under laboratory conditions, either on a bench top
or in a rack.
The general ambient conditions required at the operating site are as follows:
●The ambient temperature must be in the ranges specified for operation and for com-
pliance with specifications (see data sheet).
●All fan openings including the rear panel perforations must be unobstructed. The
distance to the wall should be at least 10 cm.
Electrostatic discharge
To avoid damage of electronic components of the DUT and the extension unit, the oper-
ating site must be protected against electrostatic discharge (ESD). ESD is most likely to
occur when you connect or disconnect the extension unit's test ports.
To prevent ESD damage use the wrist strap and grounding cord supplied with the unit
and connect yourself to the GND connector at the front panel.
2.3.3 Bench Top Operation
If the extension unit is operated on a bench top, the surface should be flat. The unit must
be used in horizontal position, standing on its feet. It is also possible to place the unit
underneath the network analyzer; see figure 3-1 on page 22.
Putting the Extension Unit into Operation

Preparing the Extension Unit for Use
R&S® ZVAX24
17Quick Start Guide 1312.7985.62 ─ 03
Danger of injury
The feet may fold in if they are not folded out completely or if the unit is shifted. The feet
may break if they are overloaded. Fold the feet completely in or completely out to ensure
stability of the unit and personal safety.
To avoid injuries, never shift the unit when its feet are folded out. The overall load (the
unit's own weight plus that of the units stacked on top of it) on the folded-out feet must
not exceed 500 N.
Place the unit on a stable surface. Secure the units stacked on top of it against slipping
(e.g. by locking their feet on the top front frame). When the unit is standing on its folded-
out feet, do not work under the unit and do not put anything under it, otherwise injuries
or material damage could occur.
The unit can be used in each of the positions shown below.
2.3.4 Mounting the Extension Unit in a 19'' Rack
The unit can be mounted in 19" racks using the adapter R&S ZZA-211 (order number
1096.3260.00). Mounting instructions are supplied with the rack adapter.
Risk of instrument damage
For rack installation, make sure that all fan openings are unobstructed and that the airflow
perforations are unimpeded. This helps to prevent the instrument from overheating.
Putting the Extension Unit into Operation

Preparing the Extension Unit for Use
R&S® ZVAX24
18Quick Start Guide 1312.7985.62 ─ 03
2.3.5 EMI Protective Measures
To avoid electromagnetic interference, the unit may only be operated when it is closed
and with all shielding covers fitted. Use only appropriate shielded signal and control
cables; see chapter 2.1.3, "RF Connectors", on page 8. Observe the EMI classifications
of both the R&S ZVAX24 and the R&S ZVA24 in their data sheets.
Electrostatic discharge
To protect the extension unit against Electrostatic Discharge (ESD) damage use the wrist
strap and grounding cord supplied with the network analyzer and connect yourself to the
GND connector at the front panel. For details refer to the Quick Start Guide of your ana-
lyzer.
2.3.6 Connecting the Extension Unit to the AC Supply
The extension unit is automatically adapted to the AC supply voltage. The supply voltage
must be in the range 100 V to 240 V; 50 Hz to 60 Hz. The mains connector is located at
the rear panel.
► Connect the extension unit to the AC power source using the AC power cable deliv-
ered with the unit.
The maximum and typical power consumption of the extension unit is listed in the data
sheet. The extension unit is protected by two fuses which can be replaced as described
in chapter 2.3.9, "Replacing Fuses", on page 19.
2.3.7 Power on and off
The mains connector and switch is located at the rear panel.
► To turn the power on or off, press the AC power switch to position I (On) or 0 (Off).
After power-on, the extension unit is in standby or ready state, depending on the state of
the standby key at the front panel of the unit.
2.3.8 Standby and Ready State
The standby key connects/disconnects all internal modules of the extension unit to/from
the DC supply voltage generated by its internal power supply.
Putting the Extension Unit into Operation

Preparing the Extension Unit for Use
R&S® ZVAX24
19Quick Start Guide 1312.7985.62 ─ 03
●In standby state (yellow LED on) the power consumption of the unit is very small,
however, the internal power supply is still connected to the AC mains power as long
as the mains power switch at the rear panel is on.
●In ready state (green LED on) all modules are power-supplied and the unit can be
used as described in chapter 3, "Pulse Profile Measurement", on page 21.
It is recommendable to switch the extension unit to standby state or switch it off by the
rear panel AC power switch if it is not used for some time.
Switching on the instruments
Switching on the connected extension unit while the network analyzer is booting can
cause problems. It is safe to switch on the R&S ZVAX24 while the R&S ZVA network
analyzer is off or in standby mode, or after it has completed its startup procedure. You
can also switch on both instruments before you connect the USB control cable.
Shock hazard
The unit is still power-supplied while it is in standby mode.
2.3.9 Replacing Fuses
The mains connector at the rear panel is protected by two fuses IEC127 T3.15 H.
► To replace the fuses carefully open the lid from the left side and remove the red fuse
holder from its shaft. If needed, use a small screwdriver for lifting the fuse holder.
2.4 Maintenance
The R&S ZVAX24 extension unit does not require any special maintenance. Make sure
that the air vents are not obstructed. The outside of the unit is suitably cleaned using a
soft, line-free dust cloth.
Instrument damage caused by cleaning agents
Cleaning agents contain substances that may damage the instrument, e.g. cleaning
agents that contain a solvent may damage the front panel labeling or plastic parts.
Never use cleaning agents such as solvents (thinners, acetone, etc), acids, bases, or
other substances.
The outside of the instrument can be cleaned sufficiently using a soft, lint-free dust cloth.
Maintenance

Preparing the Extension Unit for Use
R&S® ZVAX24
20Quick Start Guide 1312.7985.62 ─ 03
For our support center address and a list of useful R&S contact addresses refer to the
pages at the beginning of this manual.
2.5 Storing and Packing
The extension unit can be stored at the temperature range quoted in the data sheet. When
it is stored for a longer period of time the unit should be protected against dust.
The original packing should be used when the unit is to be transported or dispatched. If
the original packing is no longer available, use a sturdy cardboard box of suitable size
and carefully wrap the unit to protect it against mechanical damage.
Storing and Packing