Agilent 87075C Data Sheet

Agilent 87075C 3 MHz to 1.3 GHz
This document describes the performance and features of Agilent Technologies 87075C 75-Ohm multiport test sets, both as standalone units and when combined with Agilent 75-Ohm 8712ET, 8712ES, 8714ET, or 8714ES network analyzers. The following options are available:
• Option 012 (12 ports)
For more information about these test sets, please read the following documents:
• Agilent 87075C brochure, literature number 5968-4766E
• Agilent 87075C Configuration Guide, literature number 5968-4768E
Agilent 87075C
75-Ohm Multiport Test Sets
Data Sheet
2
All specifications and characteristics apply over a 25 °C ± 5 °C range (unless otherwise stated) and 30 minutes after the instrument has been turned on.
Definitions
Specification: Warranted performance. Specifications include guardbands to account for the expected statistical distribution, measurement uncertainties, and changes in performance due to environmental conditions.
Characteristic: A performance parameter that the product is expected to meet before it leaves the factory, but is not verified in the field and is not covered by the product warranty. A characteristic includes the same guardbands as a specification.
Typical: Expected performance of an average unit. A typical does not include guardbands. It is not covered by the product warranty.
Nominal: A general, descriptive term that does not imply a level of performance. It is not covered by the product warranty.
Supplemental information: May include typical, nomi­nal, or characteristic values.
Calibration: The process of measuring known stan­dards from a calibration kit to characterize the sys­tematic (repeatable) errors of a network analyzer.
Corrected (residual) performance: Indicates perform­ance after error correction (calibration). It is deter­mined by the quality of calibration standards and how well “known” they are, plus system repeatabil­ity, stability, and noise.
Uncorrected (raw) performance: Indicates instrument performance without error correction. The uncor­rected (raw) performance affects the stability of a calibration.
System performance: Performance of a complete multiport test system, which includes an 87075C test set and a 75-Ohm 8712ET/ES or 8714ET/ES network analyzer.
Test Set Cal: The calibration of a multiport test sys­tem, requiring the connection of known calibration standards to all of the ports that will be used for measurements.
SelfCal: An automated system calibration that uses calibration standards internal to the test set and the most recent Test Set Cal data to calibrate the test system.
Environmental specifications: Environmental specifi­cations bound the external conditions for which the specifications are valid. The environmental specifications also bound the external conditions the test set may be subject to without permanently affecting performance or causing physical damage.
Table of contents
System performance, two-port calibration 3 System performance, T/R calibration 5 System performance, uncorrected 8 System performance, general 9 Test set input/output performance 12 Test set general information 13 Physical dimensions 14 Block diagrams 15 System features 16
Introduction
3
Two-port calibration (user)
Agilent 85036B/E Type-N calibration kit
Transmission uncertainty (typical)
2
Reflection uncertainty (typical)
2
1. These specifications apply under the following conditions: measurement uses the “Fine” (15 Hz) bandwidth, no averaging, and isolation cal “on”; Test Set Cals use the “Fine” (15 Hz) bandwidth, 16 averages, and assume an isolation calibration has been performed; the test set must be used with a 75-Ohm 8712ES or 8714ES network analyzer with firmware revision E.06.00 or later; the test set and the ana­lyzer must have had their performance verified within the last year; both instru­ments must have warmed up for at least 30 minutes after turn-on; measurements are made at an environmental temperature of 25 °C ± 5 °C and within ± 1 °C of the last valid Test Set Cal.
2. These uncertainty curves only include the effects of the test port(s) within the measurement path. The effect of the uncorrected match of test ports outside the measurement path is ignored, and is dependent on the isolation between the ports of the DUT that are within the measurement path and ports of the DUT that are outside the measurement path.
System performance
Magnitude
Phase
Magnitude
Phase
Specification1(dB)
Parameter 3 MHz to 1.3 GHz
Directivity 47
Source match 37
Load Match 47
Reflection tracking ±0.1
Transmission tracking ±0.1
4
Two-port calibration (user)
Agilent 85039B Type-F calibration kit
Transmission uncertainty (typical)
3
Reflection uncertainty (typical)
3
1. These specifications apply under the following conditions: measurement uses the “Fine” (15 Hz) bandwidth, no averaging, and isolation cal “on”; Test Set Cals use the “Fine” (15 Hz) bandwidth, 16 averages, and assume an isolation calibration has been performed; the test set must be used with a 75-Ohm 8712ES or 8714ES network analyzer with firmware revision E.06.00 or later; the test set and the analyzer must have had their performance verified within the last year; both instruments must have warmed up for at least 30 minutes after turn-on; measure­ments are made at an environmental temperature of 25 °C ± 5 °C and within ± 1 °C of the last valid Test Set Cal.
2. Measurements made using a DUT with center pins of the Type-F connectors meeting the 0.77 to 0.86 mm limits.
3. These uncertainty curves only include the effects of the test port(s) within the measurement path. The effect of the uncorrected match of test ports outside the measurement path is ignored, and is dependent on the isolation between the ports of the DUT that are within the measurement path and ports of the DUT that are outside the measurement path.
System performance
Magnitude
Phase
Magnitude
Phase
Specification
1,2
(dB)
Parameter 3 MHz to 1.3 GHz
Directivity 35
Source match 28
Load Match 35
Reflection tracking ±0.1
Transmission tracking ±0.2
Transmission/reflection (T/R) calibration (user)
Agilent 85036B/E Type-N calibration kit
1. These specifications are valid for reflection (one-port) and transmission (enhanced-response) Test Set Cals, and apply under the following conditions: measurement uses the “Fine” (15 Hz) bandwidth, no averaging, and isolation cal “on”; Test Set Cals use the “Fine” (15 Hz) bandwidth, 16 averages, and assume an isolation calibration has been performed; the test set must be used with a 75-Ohm 8712ET, 8712ES, 8714ET, or 8714ES network analyzer with firmware revi­sion E.06.00 or later; the test set and the analyzer must have had their perform­ance verified within the last year; both instruments must have warmed up for at least 30 minutes after turn-on; measurements are made at an environmental temperature of 25 °C ± 5 °C and within ± 1 °C of the last valid Test Set Cal.
2. Corrected system performance is changed to typical when the current tempera­ture has drifted beyond ± 1 °C of the last valid Test Set Cal. Typicals are valid only when the current temperature is within 25 °C ± 5 °C, and within ± 1 °C of the most recent SelfCal.
Specification1(dB) Typical2(dB)
Parameter 3 MHz to 1.3 GHz 3 MHz to 1.3 GHz
Directivity 40
Source match 35
Load match (reflection calibration) 20 25
Load match (transmission calibration) 15 20
Reflection tracking ±0.1
Transmission tracking ±0.1
5
System performance
6
Transmission/reflection (T/R) calibration (user)
Agilent 85036B/E Type-N calibration kit (continued)
1. These uncertainty curves only include the effects of the test port(s) within the measurement path. The effect of the uncorrected match of test ports outside the measurement path is ignored, and is dependent on the isolation between the ports of the DUT that are within the measurement path and ports of the DUT that are outside the measurement path.
System performance
Transmission uncertainty, enhanced-response calibration (typical)
1
Magnitude, ES models
Magnitude, ET models with attenuator
Magnitude, ET models without attenuator
Phase, ES models
Phase, ET models with attenuator
Phase, ET models without attenuator
7
Transmission/reflection (T/R) calibration (user)
Agilent 85036B/E Type-N calibration kit (continued)
1. These uncertainty curves only include the effects of the test port(s) within the measurement path. The effect of the uncorrected match of test ports outside the measurement path is ignored, and is dependent on the isolation between the ports of the DUT that are within the measurement path and ports of the DUT that are outside the measurement path.
System performance
Magnitude, ES models
Magnitude, ET models with attenuator
Magnitude, ET models without attenuator
Phase, ES models
Phase, ET models with attenuator
Phase, ET models without attenuator
Reflection uncertainty, one-port calibration (typical)
1
8
Uncorrected
Type-N
1. These specifications apply under the following conditions: measurement uses the “Fine” (15 Hz) bandwidth with narrowband detection and no averaging, and isola­tion cal “on”; Test Set Cals use the “Fine” (15 Hz) bandwidth, 16 averages, and assume an isolation calibration has been performed; the test set must be used with a 75-Ohm 8712ET, 8712ES, 8714ET or 8714ES network analyzer with firm­ware revision E.06.00 or later; the test set and the analyzer must have had their performance verified within the last year; both instruments must have warmed up for at least 30 minutes after turn-on; measurements are made at an environmental temperature of 25 °C ± 5 °C and within ± 1 °C of the last valid Test Set Cal.
2. This is the match of any test port that is unselected (not in the measurement path). If the network analyzer is performing a reflection measurement with one­port calibration, then only one port on the test set is selected (the source port). If the network analyzer is performing a transmission measurement or a reflection measurement with two-port calibration, then only two ports on the test set are selected (the source and load ports).
3. This is the match of the test set port that has been selected as the load port. The network analyzer must be making a transmission measurement or a reflection measurement with two-port calibration for a test port to be selected as the load port.
4. The uncorrected tracking terms are defined as the deviation over the defined frequency band, ignoring offset loss.
5. Crosstalk is computed by normalizing the result of an isolation measurement to a through measurement between the two ports such that the path losses are taken into account. Isolation is defined as the transmission signal measured between any two ports of the test system when those two ports are terminated with shorts.
System performance
Specification1(dB) Typical (dB)
Parameter 3 MHz to 1.3 GHz 3 MHz to 1.3 GHz
Source match, ratioed 10 15
Load match, test port unselected
2
20 25
Load match, test port selected
3
13 18
Transmission tracking
4
±3.0
Reflection tracking
4
±3.0
Crosstalk5, 8712ET/8714ET 72
Crosstalk5, 8712ES/8714ES 72
9
General
1. Noise floor is defined as the rms value of the trace (in linear format) for a trans­mission measurement in CW mode, using the “Fine” bandwidth (15 Hz), the test ports terminated in loads, 0 dBm at the test set source port, and no averaging. This measurement ignores the effects of crosstalk. This is a system specifica­tion—the test set increases the network analyzer noise floor by adding loss to the network analyzer measurement.
2. The system dynamic range is calculated as the difference between the receiver minimum input (noise floor plus calibrated crosstalk) and the system’s maximum output power. System dynamic range applies to transmission measurements only, since reflection measurements are limited by directivity.
System performance
Specification Typical
System bandwidth
Fine Fine Med Wide Wide
15 Hz 15 Hz 4000 Hz 6500 Hz
3 MHz 3 MHz 3 MHz 3 MHz
to to to to
Network analyzer 1.3 GHz 1.3 GHz 1.3 GHz 1.3 GHz
System noise floor1(dBm)
8712ET/8714ET –96 –104 –79 –40
8712ES/8714ES –87 –99 –75 –42
System dynamic range2(dB)
8712ET, no attenuator 65 82 82 44
8712ET, with attenuator 63 81 81 43
8712ES 61 79 75 42
8714ET, no attenuator 65 79 79 41
8714ET, with attenuator 60 78 78 40
8714ES 58 76 72 39
General (continued)
Dynamic accuracy (typical)
2
1. The receiver dynamic range is calculated as the difference between the receiver minimum input (noise floor) and the receiver maximum input. Receiver dynamic range applies to transmission measurements only, since reflection measurements are limited by directivity.
2. The reference power for dynamic accuracy is –20 dBm.
System performance
Specification Supplemental information
System bandwidth
Fine Fine Med Wide Wide
Network analyzer 15 Hz 15 Hz 4000 Hz 6500 Hz
Receiver dynamic range1(dB)
8712ET/8714ET 114 119 94 56
8712ES/8714ES 105 114 90 57
10
Magnitude, ES models
Magnitude, ET models
Phase, ES models
Phase, ET models
11
General (continued)
1. This is the time required to switch to any new port configuration, and requires that the Test Set Cal has been performed for 201 points, the new measurement configuration is 201 points, and no new SelfCal occurs during switching.
2. This is the time required to perform the SelfCal for any single port configuration, assuming that the Test Set Cal was performed for 201 points, the new measure­ment configuration is 201 points, and the measurement bandwidth is “Med Wide” (4000 Hz). SelfCal times for other settings can be found in Table 4-1 of the Agilent 87050E/87075C User’s and Service Guide (87050-90026).
System performance
Network analyzer Specification Characteristic (dBm)
Output power (system maximum)
<1 GHz >1 GHz
8712ET, no attenuator 7 3.5
8712ET, with attenuator 6 2.5
8712ES 4 0.5
8714ET, no attenuator 2 0.5
8714ET, with attenuator 1 –0.5
8714ES 0 –2.5
Parameter Specification Supplemental information
Port switching time1(sec)
Reflection calibration
0.7
Transmission enhanced calibration 0.7
Two-port calibration 0.7
SelfCal time2(sec)
Reflection calibration 1 (typical)
Transmission enhanced calibration 3 (typical)
Two-port calibration 8 (typical)
12
1. Compression is defined for the test set, independent of the network analyzer.
2. This is the match of the test set port that has been selected as the source port. The test set interconnect reflection port must be terminated with a load standard from an 85036B/E calibration kit.
3. This is the match of any test port that is unselected (not in the measurement path). Only the source port of the test set is selected when you make a reflection measurement with one-port calibration. Only the source and load ports of the test set are selected when you make a transmission measurement, or a reflection measurement with two-port calibration.
4. This is the match of the test set port that has been selected as the load port. A transmission or two-port measurement is required for a test port to be selected as the load port. The test set interconnect transmission port must be terminated with a load standard from an 85036B/E calibration kit.
5. This is the match of the test set interconnect ports (transmission and reflection ports) with the test set in transmission, or two-port mode. The selected test set test ports must be terminated with load standards from 85036B/E calibration kits.
6. The reflection and transmission ports of the test set are connected to the corre­sponding ports of the network analyzer. Port-n is any one of the test ports used to connect to the device-under-test.
7. This is crosstalk of the test set measured between the test set’s interconnect ports, with shorts on the selected test ports. Crosstalk is computed by normaliz­ing the result of an isolation measurement to a through measurement between the two ports such that the path losses are taken into account. Isolation is defined as the transmission signal measured between any two ports of the test system when these two ports are terminated with shorts.
Test set input/output performance
Parameter Specification Supplemental
Frequency range 3 MHz to 1.3 GHz
RF input power
Maximum input power at 0.1 dB 16 dBm (nominal) compression
1
Input damage power 20 dBm (characteristic)
Specification (dB) Typical (dB)
Parameter 3 MHz to 1.3 GHz 3 MHz to 1.3 GHz
Source match, test port
2
12 16
Load match, test port unselected
3
20 25
Load match, test port selected
4
15 20
Interconnect match, reflection port
5
12 18
Interconnect match, transmission port
5
12 18
Insertion loss, reflection port to port-n
6
7.5 6.5
Insertion loss, transmission port to port-n
6
11.5 10.5
Tracking, reflection port to port-n
6
1.5
Tracking, transmission port to port-n
6
1.5
Crosstalk, uncalibrated, adjacent ports
7
57 72
Crosstalk, uncalibrated, non-adjacent ports
7
57 72
13
1. A third-wire ground is required.
Test set general information
Description Specification Supplemental information
Front panel ports
87075E, Option 006 6 Type-N, female 75 Ohms (nominal)
87075E, Option 012 12 Type-N, female 75 Ohms (nominal)
Real panel
Parallel in connector 25-pin D-subminiature female (DB-25)
Parallel out connector 25-pin D-subminiature female (DB-25)
Line power
1
Frequency 47 to 63 Hz
Input voltage, operating 90 to 264 V
Input power <45 W (typical)
General environment
Minimize using static-safe work
ESD procedures and an antistatic bench mat
(part number 9300-0797)
Dust Minimize for optimum reliability
Operating environment
General Indoor use only
Temperature 0 °C to + 55 °C
Humidity (relative)
less than 80% RH up to 31 °C,
decreasing linearly to 50% RH at 40 °C
Altitude 0 to 4.5 km (15,000 ft)
Storage conditions
Temperature –40 °C to +70 °C
Humidity (relative) 0% to 90% RH at +65 °C (noncondensing)
Altitude 0 to 15 km (50,000 ft)
Cabinet dimensions
132.8 x 425 x 497 mm (nominal)
Height x width x depth 5.2 x 16.7 x 19.6 in (nominal)
Cabinet dimensions exclude front and rear protrusions
Weight
Net 8 kg (18 lb) (nominal)
Shipping 11 kg (24 lb) (nominal)
14
Physical dimensions of the Agilent 87075C Option 006 multiport test set
1
Physical dimensions of the Agilent 87075C Option 012 multiport test set
1
1. These dimensions exclude rear protrusions.
Physical dimensions
15
Block diagram for the Agilent 8712ET and 8714ET
Block diagram for the Agilent 8712ES and 8714ES
Block diagram for the Agilent 87075C (only one test set port pair is shown)
Block diagrams
REAR PANEL
ADC and Processor
CRT
FRONT PANEL Reflection
With Attenuator Option 1E1
Narrowband Detector
Broadband Detector
AUX Input
Y
Input B
Input B*
X
Input R
Input R*
Input A
External Detectors
Reference
Reflected
(RF Out)
Y
X
RF
Source
Device
Under
Test
Incident
Transmission
Transmission
(RF In)
REAR PANEL
ADC and Processor
CRT
FRONT PANEL
Narrowband Detector
Broadband Detector
AUX Input
Y
Input B
Input B*
X
Input R
Input R*
Input A
External Detectors
Reference
Port 1
Y
X
RF
Source
Device Under
Test
Port 2
16
Test set control
Control of the switches inside the test set and cali­bration of the test system can be accomplished from the front panel of the network analyzer—an external computer is not required. However, the analyzers are fully programmable for use in auto­mated test environments.
Measurement
Number of display measurements
Two measurement displays are available, with independent control of display parameters includ­ing format type, scale per division, reference level, reference position, and averaging. The displays can share network analyzer sweep parameters, or, by using alternate sweep, each measurement can have independent sweep parameters including frequency settings, IF bandwidth, power level, and number of trace points. The instrument can display a single measurement, or dual measurements on a split (two graticules) or overlaid (one graticule) screen.
Measurement choices
Narrowband ET models: reflection (A/R), transmission (B/R),
A, B, R ES models: S11(A/R), S22(B/R), S21(B/R), S12(A/R), A, B, R
Broadband X, Y, Y/X, X/Y, Y/R*, power (B*, R*), conversion loss (B*/R*) Note: X and Y denote external broadband-detector inputs; * denotes internal broadband detectors.
Formats
Log or linear magnitude, SWR, phase, group delay, real and imaginary, Smith chart, polar, and imped­ance magnitude.
Trace functions
Current data, memory data, memory with current data, division of data by memory.
Display annotations
Start/stop, center/span, or CW frequency, scale per division, reference level, marker data, softkey labels, warning and caution messages, screen titles, time and date, and pass/fail indication.
Limits
Measurement data can be compared to any combi­nation of line or point limits for pass/fail testing. User-defined limits can also be applied to an amplitude- or frequency-reference marker. A limit-
test TTL output is available on the rear panel for external control or indication. Limits are only available with rectilinear formats.
Data markers
Each measurement channel has eight markers. Markers are coupled between channels. Any one of eight markers can be the reference marker for delta-marker operation. Annotation for up to four markers can be displayed at one time.
Marker functions
Markers can be used in absolute or delta modes. Other marker functions include marker to center frequency, marker to reference level, marker to electrical delay, searches, tracking, and statistics. Marker searches include marker to maximum, marker to minimum, marker to target value, band­width, notch, multi-peak and multi-notch. The marker-tracking function enables continuous update of marker search values on each sweep. Marker statistics enable measurement of the mean, peak­to-peak, and standard deviation of the data between two markers. For rapid tuning and test­ing of cable-TV broadband amplifiers, slope and flatness functions are also available.
Storage
Internal memory
1.5 Mbytes (ET models) or 1 Mbyte (ES models) of nonvolatile storage is available to store instrument states, measurement data, screen images, and IBASIC programs. Instrument states can include all control settings, limit lines, memory data, calibration coef­ficients, and custom display titles. If no other data files are saved in nonvolatile memory, between approximately 20 and 150 instrument states can be saved (depending on the model type and on instrument parameters). Approximately 14 Mbytes of volatile memory are also available for tempor­ary storage of instrument states, measurement data, screen images, and IBASIC programs.
Disk drive
Trace data, instrument states (including calibra­tion data), and IBASIC programs can be saved on floppy disks using the built-in 3.5-inch disk drive. All files are stored in MS-DOS®-compatible format. Instrument data can be saved in binary or ASCII format (including Touchstone/.s2p format), and screen graphics can be saved as PCX (bit-mapped), HP-GL (vector), or PCL5 (printer) files.
NFS: See description under Control via LAN.
System features
17
Data hard copy
Hard copy prints can be made using PCL and PCL5 printers (such as HP DeskJet or LaserJet series printers), or Epson-compatible graphics printers. Single color and multicolor formats are supported. Hard copy plots can be automatically produced with HP-GL-compatible plotters such as the Agilent 7475A, or with printers that support HP-GL. The analyzer provides Centronics (parallel), RS-232C, GPIB, and LAN interfaces.
Automation
Controlling via GPIB Interface: The GPIB interface operates to IEEE
488.2 and SCPI standard-interface commands.
Control: The analyzer can either be the system controller, or pass bus control to another active controller.
Data transfer formats:
• ASCII
• 32- or 64-bit IEEE 754 floating-point format
• Mass-memory-transfer commands allow file transfer between external controller and analyzer.
Control via LAN
The built-in LAN interface and firmware support data transfer and control via direct connection to a 10 Base-T (Ethertwist) network. A variety of stan­dard protocols are supported, including TCP/IP, sockets, ftp, http, telnet, bootp, and NFS. The LAN interface is standard.
SCPI: The analyzer can be controlled by sending Standard Commands for Programmable Instru­ments (SCPI) within a telnet session or via a socket connection and TCP/IP (the default socket port is
5025). The analyzer’s socket applications program-
ming interface (API) is compatible with Berkeley sockets, Winsock, and other standard socket APIs. Socket programming can be done in a variety of environments including C programs, Agilent VEE, SICL/LAN, or a Java™ applet. A standard web browser and the analyzer’s built-in web page can be used to remotely enter SCPI commands via a Java applet.
FTP: Instrument state and data files can be trans­ferred via ftp (file-transfer protocol). An internal, dynamic-data disk provides direct access to instru-
ment states, screen dumps, trace data, and operat­ing parameters.
HTTP: The instrument’s built-in web page can be accessed with any standard web browser using http (hypertext transfer protocol) and the network analyzer’s IP address. The built-in web page can be used to control the network analyzer, view screen images, download documentation, and link to other sites for firmware upgrades and VXIplug&play drivers. Some word processor and spreadsheet pro­grams, such as Microsoft® Word 97 and Excel 97, provide methods to directly import graphics and data via a LAN connection using http and the net­work analyzer’s IP address.
SICL/LAN: The analyzer’s support for SICL (standard instrument control library) over the LAN provides control of the network analyzer using a variety of computing platforms, I/O interfaces, and operating systems. With SICL/LAN, the analyzer is controlled remotely over the LAN with the same methods used for a local analyzer connected directly to the com­puter via a GPIB interface. SICL/LAN protocol also allows the use of Agiltent’s free VXIplug&play driver to communicate with the multiport test system over a LAN. SICL/LAN can be used with Windows® 95/98/NT, or HP-UX.
NFS: The analyzer’s built-in NFS (network file sys­tem) client provides access to remote files and directories using the LAN. With NFS, remote files and directories (stored remotely on a computer) behave like local files and directories (stored locally within the analyzer). Test data taken by the net­work analyzer can be saved directly to a remote PC or UNIX® directory, eliminating the need for a remotely initiated ftp session. For Windows-based applications, third-party NFS-server software must be installed on the PC. NFS is fully supported in most versions of UNIX.
Bootp: Bootstrap protocol (bootp) allows a network analyzer to automatically configure itself at power­on with the necessary information to operate on the network. After a bootp request is sent by the analyzer, the host server downloads an IP and gate­way address, and a subnet mask. In addition, the analyzer can request an IBASIC file, which auto­matically executes after the transfer is complete. For Windows-based applications, third-party bootp-server software must be installed on the PC. Bootp is fully supported in most versions of UNIX.
System features (continued)
18
Programming with IBASIC
As a standard feature, all Agilent 8712ET/ES and 8714ET/ES network analyzers come with the Instrument BASIC programming language (IBA­SIC). IBASIC facilitates automated measurements and control of other test equipment, improving productivity. For simpler applications, you can use IBASIC as a keystroke recorder to easily automate manual measurements. Or, you can use an optional, standard PC keyboard to write custom test applica­tions that include:
• Special softkey labels
• Tailored user prompts
• Graphical setup diagrams
• Barcode-reading capability
• Control of other test instruments via the GPIB, serial, or parallel interfaces
Measurement calibration
Measurement calibration is a process that improves measurement accuracy by using error­correction arrays to remove systematic measure­ment errors.
The Test Set Cal and SelfCal features on your mul­tiport test system increase the accuracy of your measurements and significantly increase the test efficiency of your work stations by eliminating frequent and lengthy calibration procedures.
Test Set Cal
A Test Set Cal is a calibration that should be per­formed on a regular but relatively infrequent basis (at least once a month is recommended). A Test Set Cal requires connection of mechanical calibration standards to all of the ports you will be using for your measurements.
Test Set Cal for the 8712ET and 8714ET analyzers
The data collected by the analyzer during a Test Set Cal always includes both transmission (enhanced response) calibration data and reflec­tion (one-port) calibration data. When making measurements after calibration, the analyzer auto­matically recalls and uses the correct set of cali­bration data for the type of measurement chosen.
Test Set Cal for the 8712ES and 8714ES analyzers
The S-parameter network analyzers perform either two-port calibration or enhanced response/one­port calibration. Choosing a two-port calibration for the Test Set Cal removes the most systematic errors, giving you the greatest measurement accu­racy. Choosing the enhanced response/one-port calibration allows faster measurement speeds, but is not as accurate as full two-port calibration.
SelfCal
A SelfCal is an internal system calibration that automatically executes in just a few seconds on a regular, frequent basis (once per hour is recom­mended). A SelfCal does not require that you remove your DUT or that you make any connections of external calibration standards. The SelfCal uses the results of the most recent Test Set Cal, along with current measurements of internal, electroni­cally switched, open, short, load, and through standards. SelfCal removes the drift of the network analyzer and multiport test set due to environ­mental variations.
System features (continued)
19
Other calibrations
Besides using a Test Set Cal, individual instrument states and their corresponding calibrations can be saved and recalled for use with specific measure­ment paths. For example, to improve measurement throughput, one signal path could be tested using a response calibration, while all other paths are tested with a Test Set Cal using two-port calibration. Note: the SelfCal feature is only supported with Test Set Cals.
A variety of calibration types are available and described below:
ES models only
Two-port calibration Compensates for frequency response, source and load match, and directivity errors while making S-parameter measurements of trans­mission (S21, S12) and reflection (S11, S22). Compensates for transmission crosstalk when the Isolation on OFF softkey is toggled to ON. Requires short, open, load, and through standards.
ET and ES models: transmission measurements
Normalization Provides simultaneous magnitude and phase correction of transmission frequency-response errors. Requires a through connection. Used for both narrowband and broadband detection. Does not support calibration interpolation.
Response Simultaneous magnitude and phase correction of frequency response errors for transmission measurements. Requires a through standard.
Response and isolation Compensates for frequency response and crosstalk errors. Requires a load termination on both test ports and a through standard.
Enhanced response Compensates for frequency response and source match errors. Requires short, open, load, and through standards.
ET and ES models: reflection measurements
One-port calibration
Compensates for frequency response, directivity, and source-match errors. Requires short, open, and load standards.
Calibration kits
Data for several standard calibration kits are stored in the instrument for use by the calibration routines. They include:
• Type-N 75-Ohm (Agilent 85036B/E)
• Type-F (Agilent 85039B)
In addition, you can also describe the standards for a user-defined calibration kit (for example, open-circuit capacitance coefficients, offset-short length, or through-standard loss).
For more information about calibration kits avail­able from Agilent, consult the 87075C Configuration Guide, literature number 5968-4768E.
Key network analyzer options
75 Ohms (Option 1EC)
Provides 75-Ohm system impedance.
Step attenuator (Option 1E1)
Adds a built-in 60 dB step attenuator to transmis­sion/reflection (ET) models to extend the output power range to –60 dBm. The attenuator is stan­dard in S-parameter (ES) models.
System features (continued)
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Our Promise
“Our Promise” means your Agilent test and measurement equip­ment will meet its advertised performance and functionality. When you are choosing new equipment, we will help you with product information, including realistic performance specifica­tions and practical recommendations from experienced test engineers. When you use Agilent equipment, we can verify that it works properly, help with product operation, and provide basic measurement assistance for the use of specified capabili­ties, at no extra cost upon request. Many self-help tools are available.
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