Agilent 8757D
Scalar Network Analyzer
Data Sheet
Accurate measurement of transmission and
reflection characteristics is a key requirement in
your selection of a scalar network analyzer. To
help you achieve these goals, Agilent Technologies
offers you a choice of microwave scalar measurement solutions which provide an excellent balance
of cost, system versatility, and measurement
precision.
Agilent 8757D overview of features
• Four display channels
• Three detector inputs
• An optional fourth detector input
• An optional internal power calibrator
• Accurate power measurements with
Agilent 85037 series precision detectors
• High resolution color display
• Internal plotter/printer buffer
• +16 to –60 dBm dynamic range
• AC/DC detection modes
• 101 to 1601 measurement points/trace
• Noise figure measurement display capability
• Compatible with the Agilent 85025 and 85026
series detectors and the Agilent 85027 series
directional bridges
• Limit line testing (channels 1 and 2)
• Adaptive normalization
• Cursor search functions (max, min, n dB, BW)
Specifications describe the instrument’s warranted performance over the
temperature range 0 to 55 °C (except where noted). Supplemental characteristics
are intended to provide information useful in applying the instrument, by giving
typical but non-warranted performance parameters. These are denoted as “typical,”
“nominal,” or “approximate.”
Agilent 8757D scalar network analyzer
The Agilent 8757D has four independent display
channels that process the signals from the Agilent
85037 series precision detectors, 85025 and 85026
detectors, and the 85027 series directional bridges
for logarithmic display, in single channel or ratio
mode. Three (optionally four) detector inputs are
provided.
Display
Horizontal resolution
The number of points (horizontal resolution)
that can be selected depends on the number of
traces displayed.
Network analyzer Traces Selectable number of points
8757D 1 101, 201, 401, 801, 1601
2 101, 201, 401, 801
3, 4 101, 201, 401
LCD Display 640 (horizontal) x 480 (vertical) resolution
A display is considered faulty if:
• A complete row or column of “stuck” or “dark”
pixels.
• More than six “stuck on” pixels (but not more
than three green) or more than 0.002% of the
total pixels are within the LCD specifications.
• More than twelve “dark” pixels (but no more
than seven of the same color) or more than
0.004% of the total pixels are within the LCD
specifications.
• Two or more consecutive “stuck on” pixels or
three or more consecutive “dark” pixel (but no
more than one set of two consecutive dark
pixels) “Stuck on” of “dark” pixels less than
6.5 mm apart (excluding consecutive pixels)
Display modes
All analyzer display channels can display any one
of the detector inputs or any ratio combination
of detector inputs.
Log magnitude
dBm: single channel power measurement
dB: relative power measurement (ratio or relative
to trace memory)
SWR
Relative measurements (normalized or ratio
measurements) can be displayed in SWR.
Channels 1 and 2 only: 401 points or fewer
AUX voltage
The rear panel BNC input ADC IN can be measured and displayed in volts (–10 to +10 volts).
Typical maximum error is 60 mV.
Color settings
Up to 8 operator-selectable colors are available
for LCD attributes, such as the grid, measurement
traces, and labels.
Sweep time
The minimum sweep time depends on the number of traces displayed and the number of points
selected.
Minimum sweep time (ms)
Number (log magnitude format)
of points 1 trace 2 traces 3 traces 4 traces
101 40 50 60 70
201 50 75 90 100
401 100 100 150 200
801 200 250
1601 400 NA NA NA
Averaging
2, 4, 8, 16, 32, 64, 128, or 256 successive traces can
be averaged.
Smoothing
Provides a linear moving average of adjacent data
points. The smoothing aperture defines the trace
width (number of data points) to be averaged, and
ranges from 0.1% to 20% of the trace width.
Normalization
Traces are stored and normalized with the highest
resolution, independent of display scale/division or
offset. With adaptive normalization on the Agilent
8757D, calibration data is interpolated when the
frequency span is decreased.
Limit lines
Limit lines facilitate quick pass/fail decisions.
Limits can be any combination of flat or sloped
lines or single points up to 12 segments. They
are only available for channels 1 and 2, for traces
with 401 points or fewer, and can be stored in
save/recall registers 1 through 4.
2
Internal save/recall registers
Up to 9 complete front panel states may be saved
or recalled. If the source (Agilent PSG, 8360 or 8370
series) is connected to the 8757 system interface,
the front panel states of both the network analyzer
and source are saved. Registers 1 through 4 store
the instrument state and the memory traces for
channels 1 and 2. The memory traces for channels
3 and 4 are not stored. Registers 5 through 9 only
store the instrument state.
Display Scale Display Vertical
mode resolution range resolution
dBm 0.1 to 20 dB/div –80 to +80 dBm 0.003 dB
(1/2/5 sequence)
dB 0.1 to 20 dB/div –90 to +90 dB 0.006 dB
(1/2/5 sequence)
Normalized 0.1 to 20 dB/div –180 to +180 dB 0.01 dB
ratio (1/2/5 sequence)
measurements
1
1
Modulator drive
The modulator drive output of the 8757 scalar
analyzer provides the circuitry to drive the
8340/50/60/70 series synthesized sweepers and the
Agilent 11665B modulator. Modulation drive may
be turned on and off via the front panel or GPIB.
In the “off” state, the modulator drive signal turns
the 11665B fully on for minimum insertion loss.
The 8360 and 8370 synthesized sweepers have the
capability of modulating signals, so an external
modulator such as the 11665B is not necessary
when using the 8360/70 series.
Frequency: 27,778 Hz ±12 Hz
Symmetry: 50% ±1%
Stop sweep
Used with the PSG, 8360 and 8370 series when
controlled by the 8757 system interface to stop the
sweep at band crossings and at the end of sweep.
SWR 0.02 to 10 units/div 1.0 to 37.0 0.01 at 1
(1/2/4 sequence) 0.1 at 10
0.27 at 30
AUX 0.025 to 5 V/div –10 to +10 V 0.001 V
voltage (1/2.5/5 sequence)
1. 0.01 dB for display cursor
Modulation requirements
Applies to the Agilent 85037 series precision detectors, 85025/26 series detectors, and 85027 series
directional bridges in AC mode.
Square-wave amplitude modulation
Frequency 27,778 Hz ±20 Hz
≥30 dB on/off ratio
45% to 55% symmetry
Rear panel connectors
Sweep voltage requirements (Sweep in)
Horizontal sweep voltage, normally provided by
the sweeper, from 0 to 10 volts.
Marker and blanking requirements (Pos z blank)
Blanking and marker signals are provided by the
sweeper through the “Pos z blank” input on the
rear panel of the Agilent 8757.
Voltage levels
Blanked: +5 V typical
Unblanked: 0 V typical
Marker: –4 V typical
Active marker: –8 V typical
ADC in
An input connector for auxiliary voltage input
in the –10 to +10 volt range. This voltage can be
displayed (in volts) on any channel.
Control 1 and control 2
These connectors provide digital output signals
(TTL open-collector) as a user convenience for
driving other peripheral equipment in a GPIB
controlled system.
Video outputs
Used to drive an external color monitor that has
the following characteristics:
8757D with LCD monitor (VGA input on the
analyzer’s rear panel)
• VGA compatible
8757D with CRT monitor (RGB inputs on the
analyzer’s rear panel)
• Red, green, and blue (RGB) BNC inputs, sync
on green
• 75 ohm input impedance
• 26.5 kHz horizontal scan rate
• 60 Hz vertical refresh rate
• 1 V p-p (typically 0.7 V = white; 0 V = black;
-0.3 V = sync)
3
Agilent 8757D scalar network analyzer, continued
GPIB
Interface
GPIB operates according to IEEE 488-1978 and
IEC-625 interface standards.
Interface function codes
SH1, AH1, T6, TE0, L4, LE0, SR1, RL1, PP0, DC1,
DT0, C0, E1.
Transfer formats
Data can be transferred either as ASCII strings
or as 16-bit integers. Readings may be taken at a
single point, or an entire trace may be transferred
at once.
Transfer speed
ASCII format, 401 point trace: 500 ms typical
ASCII format, single point: 10 ms typical
Binary format, 401 point trace: 30 ms typical
Binary format, single point: 7 ms typical
Programmable functions
All front panel functions except power on/off
are programmable. The 8757D is compatible with
all appropriate 8757A/C scalar analyzer programming codes.
User-accessible display graphics
HPGL subset that allows user to display test
setup diagrams and operator instructions on the
analyzer CRT/LCD.
Interrupts
GPIB service interrupts (SRQs) are generated for
the following conditions:
System interface
The Agilent 8757 system interface is a dedicated
GPIB port used exclusively by the 8757 to control
and extract information from a swept source, a
digital plotter, and a printer.
Compatible swept sources
The following swept sources are specifically made
to complement the 8757 system. With them, the
8757 is able to display start, stop, and marker frequencies, save and recall front panel states of both
the sweeper and the scalar analyzer, preset both
instruments simultaneously, and alternately sweep
two different frequency or power ranges and display both simultaneously:
• Agilent PSG1 signal generators (Option 007)
• Agilent 8360 series synthesized sweeper
• Agilent 8370 series synthesized sweeper
Printers
For a list of compatible printers, consult our
printer-compatibility guide Web page. Its URL
location is http://www.agilent.com/find/pcg. Or go
to www.agilent.com and use keyword search
printer guide.
Internal plotter/printer buffer
The GPIB buffer speeds measurements by returning the control to the analyzer while outputting
data to a plotter or printer. Output two channels
(401 points each) of information to the buffer in
typically less than 5 seconds.
Note: In order to use the currently available printers a GP-IB
to parallel port adapter is needed. Adapters are available
from Intelligent Interfaces. Please see their website at
http://www.intelligentinterfaces.com.
• Front-panel key pressed
• Operation complete
• Illegal command
• Instrument self-test error
• Limit test failed
1
URL location: http://www.agilent.com/find/psg
4
Disk interface
The 8757D provides the capability to store and
retrieve the analyzer’s instrument state, measurement data, and user accessible display graphics
to and from an external GPIB disk drive that is
compatible with command subset CS/80. Data files
are stored in Agilent’s standard LIF format and
can be read by a wide variety of computers, including the HP 9000 series 200 or 300. Files can be
stored in binary or ASCII format.
Disk drive
Agilent no longer offers Option 802, the HP 9122C
disk drive. Agilent 8757D-compatible disk drives
are available from ISA, Inc. In the U.S., contact
Saaya, Inc. (formerly known as ISA, Inc.).
Elsewhere, contact ISA Company, Ltd. at
http://www.isa-j.co.jp/.
General information
Temperature range
Operating: 0 to 55 °C
Storage: –40 to 75 °C
Power requirements
48 to 66 Hz, 100/120/220/240 V ±10%,
typically 155 VA
Dimensions: 178 H x 425 W x 482 mm D
(7.0 x 16.75 x 19.0 in)
Weight: Net 22 kg (48 lb), Shipping: 28 kg (61.5 lb)
Power calibrator (Option 002 only)
The 8757D’s internal power calibrator provides
a 50 MHz reference standard for characterizing
the absolute power accuracy and dynamic power
accuracy of the 85037 series precision detectors.
Frequency: 50 MHz ±0.2 MHz
Output power: (25 ±5 °C)
Range: +20 to –50 dBm
Accuracy at 0 dBm: ±0.05 dB
Linearity: (over any 10 dB range)
±0.08 dB (+20 to +10 dBm)
±0.04 dB (+10 to –30 dBm)
±0.06 dB (–30 to –50 dBm)
Ordering information
Agilent 8757D scalar network analyzer (select one)
8757D-700 Standard network analyzer
8757D-001 Adds fourth detector input
8757D-002 Adds internal power calibrator
8757D-012 Adds fourth detector and internal
calibrator
SWR: ≤1.05
Modes of operation
DC Mode (unmodulated)
AC Mode (modulated at 27,778 Hz ±12 Hz)
Connector: Type-N (f)
Accessory included
A Type-N (m) to 3.5-mm (f) adapter is provided
to allow calibration of the 85037B (3.5 mm)
precision detector.
5
System accuracy
Transmission measurement accuracy
Transmission loss or gain measurements are made
relative to a 0 dB reference point established at
calibration.
Transmission measurement uncertainty =
dynamic power accuracy + mismatch uncertainty
Dynamic power accuracy is the measurement
uncertainty due to the change in power level
between calibration and the measurement.
Mismatch uncertainty is the uncertainty due to
reflections in the measurement setup. The frequency
response errors of the source, detectors, bridge,
and power splitter are removed via calibration.
Transmission measurement uncertainty examples
Assumptions:
• Measurement frequency = 10 GHz
• DUT input/output SWR = 1.5
• Ratio measurement
Change in power after calibration
<30 dB (+0 to –30 dBm range)
85037B 85025E
Uncertainty component precision detector detector
Absolute power measurement accuracy
This specification is useful for determining the
accuracy of power measurements in dBm when
using the Agilent 85037 series precision detectors
or the 85025 series detectors in DC mode.
Absolute power uncertainty =
absolute power accuracy at 50 MHz + frequency
response + mismatch uncertainty
Absolute power measurement uncertainty examples
Assumptions:
• Measurement frequency = 10 GHz
• DUT input/output SWR = 1.5
Power = +10 dBm
85037B 85025E
Uncertainty component precision detector detector
Absolute power accuracy
at 50 MHz (±dB) 0.11 0.50
Frequency response (±dB) 0.18 0.50
Mismatch (±dB) 0.18 0.10
Total (±dB) 0.47 1.10
Dynamic accuracy (±dB) 0.11 0.40
Mismatch (±dB) 0.45 0.33
Total (±dB) 0.56 0.73
Change in power after calibration
60 dB (+6 to –55 dBm range)
85037B 85025E
Uncertainty component precision detector detector
Dynamic accuracy (±dB) 0.96 2.00
Mismatch (±dB) 0.45 0.33
Total (±dB) 1.41 2.33
Power = 0 dBm
85037B 85025E
Uncertainty component precision detector detector
Absolute power accuracy
at 50 MHz (±dB) 0.11 0.40
Frequency response (±dB) 0.18 0.50
Mismatch (±dB) 0.18 0.10
Total (±dB) 0.47 1.00
Power = 50 dBm
85037B 85025E
Uncertainty component precision detector detector
Absolute power accuracy
at 50 MHz (±dB) 0.85 1.30
Frequency response (±dB) 0.18 0.50
Mismatch (±dB) 0.18 0.10
Total (±dB) 1.21 1.90
6
Precision detector vs. power sensor absolute
power measurement accuracy
Accuracy terms differ depending on the test equipment used to make absolute power measurements.
The following table simplifies and compares the
accuracy terms of an Agilent 8757 system (using
an 85037 series precision detector) and a power
meter (using a power sensor). A measurement
accuracy example is also provided.
Scalar terms Equivalent power meter/sensor terms
Reflection measurement accuracy
Uncertainties due to calibration error and the
frequency response of the source, detectors, and
bridges are removed via open/short averaging.
The remaining uncertainties are primarily the sum
of directivity uncertainty, effective source match
uncertainty, and dynamic power accuracy. As shown
in the graphs below, directivity is the dominant error
term when measuring small reflected signals (high
return loss) and source match is dominant when
measuring large reflected signals (low return loss).
Absolute power Power reference uncertainty
accuracy at 50 MHz Instrument linearity
Zero set
Noise
Frequency response Sensor calibration factor uncertainty
Mismatch Mismatch
Scalar analyzer vs. power meter
Absolute power measurement uncertainty examples
Assumptions:
• Measurement frequency = 10 GHz
• DUT input/output SWR = 1.5
• Power measurement range = +10 to –20 dBm
Uncertainty component
(see above table for 8757D Opt. 002/ EPM-4418B
equivalent power meter terms) 85037B 8485A
Absolute power accuracy
at 50 MHz (±dB) 0.11 0.09
Frequency response (±dB) 0.18 0.09
Mismatch (±dB) 0.18 0.12
Total (±dB) 0.47 0.30
Effective source match vs. reflection uncertainty
Directivity vs. reflection uncertainty
Example calculation
The following example shows how to find the
uncertainty (excluding dynamic accuracy) in
measuring a 14-dB return loss (SWR = 1.5)
with an 85027A directional bridge at 10 GHz
(directivity = 40 dB, test port match = 1.25 SWR).
Uncertainty component Uncertainty
Source match error approximately ±0.2 dB
Directivity error approximately ±0.4 dB
Total uncertainty approximately ±0.6 dB
7
System accessories
Detectors
Agilent 85037 series precision detectors (AC/DC)
The 85037 series precision detectors are designed
specifically for operation with the Agilent 8757D
scalar network analyzer and are not compatible
with the 8757A/E, 8756, or 8755 scalar network
analyzers. These detectors may be used in either
AC or DC detection modes. For improved power
measurement accuracy versus frequency, each
85037 series precision detector includes detector
specific frequency response data, stored in an
internal EEPROM, which is automatically read
by the 8757D. When used in conjunction with the
8757D’s internal power calibrator (Option 002),
these detectors provide the maximum absolute
power measurement accuracy.
Agilent 85025 and 85026 series detectors (AC/DC)
The 85025 and 85026 series detectors are designed
specifically for operation with the Agilent 8757
scalar network analyzer and are not compatible
with either the 8756 or the 8755. The 85025/26
detectors may be used in either AC or DC
detection modes.
General information—coaxial detectors
Impedance: 50 ohms nominal
Maximum input power: +20 dBm (100 mW)
Maximum input voltage: 10 VDC
Dimensions: Cable length is 1.22 m (48 in.)
Weight: Net 0.24 kg (0.5 lb), Shipping 1.0 kg (2.2 lb)
Detector adapters
The Agilent 85025C detector adapters match the
scalar analyzer display to most standard crystal,
silicon, and gallium arsenide detectors. This
enables the user to operate up to 110 GHz with
the Agilent 8757. The 85025C detector adapters
are designed for use with the 8757 only, and can
operate in either AC or DC detection modes.
Maximum measurable input: ±3 V peak
Maximum allowable input: ±10 V peak
Connector: SMA (m)
Precision Detector Summary, Agilent 85037 Series1
For use with the 8757D in either AC or DC detection modes
Frequency Connector Return Frequency
Model range type Dynamic range Frequency loss response
85037A 10 MHz to 18 GHz Type-N (m) AC mode +20 to –55 dBm 0.01 to 0.04 GHz 10 dB ±0.35 dB
7 mm
85037B 10 MHz to 26.5 GHz 3.5 mm (m) AC mode +20 to –55 dBm 0.01 to 0.04 GHz 10 dB ±0.35 dB
DC mode +20 to –50 dBm 0.04 to 18 GHz 20 dB ±0.18 dB
18 to 26.5 GHz 18 dB ±0.22 dB
Power Dynamic accuracy
Model (50 MHz) Corrected Default Corrected Default
85037A/B 20 dBm ±0.25 dB ±0.40 dB ±0.25 dB ±0.40 dB
10 dBm ±0.11 dB ±0.40 dB ±0.11 dB ±0.40 dB
–30 dBm ±0.11 dB ±0.40 dB ±0.11 dB ±0.40 dB
–40 dBm ±0.40 dB ±0.80 dB ±0.40 dB ±0.80 dB
–50 dBm ±0.85 dB ±1.30 dB ±0.85 dB ±1.30 dB
–55 d8m ±0.85 dB ±1.30 dB — —
Temperature coefficient of linearity: 0.01 dB/°C temperature change after calibration
2
DC mode +20 to –50 dBm 0.04 to 18 GHz 20 dB ±0.18 dB
4,5
Absolute accuracy
4,6
3
1. The 85037A/B specifications are only applicable when used with the 8757D
scalar network analyzer.
2. Option 001 changes to 7 mm connector.
3. –10 dBm, 25 ±5 °C
8
4. The corrected specifications apply after a calibration via the 8757D-002 internal
power calibrator. The default specifications apply when the calibrator is not used.
Power calibrator uncertainty is included in the 85037A/B corrected specifications.
5. Dynamic accuracy refers to measurement accuracy as power varies (in dB) from
a 0 dBm reference. 25 ±5 °C. 50 MHz, calibration and measurement at the same
temperature.
6. DC mode. 25 ±5 °C, calibration and measurement at the same temperature.
Coaxial Detector Summary, Agilent 85025 Series
For use with the 8757 in either AC or DC detection modes
Frequency Connector Dynamic Return Frequency Power Dynamic Absolute
Model range type range Frequency loss response2 (50 MHz) accuracy3 accuracy
85025A5 10 MHz to Type-N (m) AC mode 0.01 to 0.04 GHz 10 dB ±0.8 dB 16 dBm ±0.8 dB ±0.8 dB
18 GHz +16 to –55 dBm 0.04 to 4 GHz 20 dB ±0.5 dB 6 dBm ±0.4 dB ±0.4 dB
7 mm1 DC mode 4 to 18 GHz 17 dB ±0.5 dB –35 dBm ±0.4 dB ±0.4 dB
+16 to –50 dBm –50 dBm ±1.3 dB ±1.3 dB
–55 dBm ±1.6 dB
85025B5 10 MHz to 3.5 mm (m) AC mode 0.01 to 0.04 GHz 10 dB ±0.8 dB 16 dBm ±0.8 dB ±0.8 dB
26.5 GHz +16 to –55 dBm 0.04 to 4 GHz 20 dB ±0.5 dB 6 dBm ±0.4 dB ±0.4 dB
DC mode 4 to 18 GHz 17 dB ±0.5 dB –35 dBm ±0.4 dB ±0.4 dB
+16 to –50 dBm 18 to 26.5 GHz 12 dB ±2.0 dB –50 dBm ±1.3 dB ±1.3 dB
–55 dBm ±1.6 dB
85025D5 10 MHz to 2.4 mm (m) AC mode 0.01 to 0.1 GHz 10 dB ±0.8 dB 16 dBm ±1.0 dB ±1.0 dB
50 GHz +16 to –55 dBm 0.1 to 20 GHz 20 dB ±0.5 dB 6 dBm ±0.4 dB ±0.4 dB
DC mode 20 to 26.5 GHz 20 dB ±1.0 dB –35 dBm ±0.4 dB ±0.4 dB
+16 to –50 dBm 26.5 to 40 GHz 15 dB ±2.5 dB –50 dBm ±1.3 dB ±1.3 dB
40 to 50 GHz 9 dB ±3.0 dB –55 dBm ±1.6 dB
85025E5 10 MHz to 3.5 mm (m) AC mode 0.01 to 0.1 GHz 10 dB ±0.8 dB 16 dBm ±1.0 dB ±1.0 dB
26.5 GHz +16 to –55 dBm 0.1 to 18 GHz 25 dB ±0.5 dB 6 dBm ±0.4 dB ±0.4 dB
DC mode 18 to 25 GHz 25 dB ±0.5 dB –35 dBm ±0.4 dB ±0.4 dB
+16 to –50 dBm 25 to 26.5 GHz 23 dB ±1.4 dB –50 dBm ±1.3 dB ±1.3 dB
–55 dBm ±1.6 dB
Waveguide Detectors and Detector Adapters Summary
For use with the 8757 only in either AC or DC detection modes
4
Frequency Connector Return Frequency Dynamic
Model range type Dynamic range loss response accuracy
R85026A5 26.5 to WR-28 +10 to –50 dBm (AC mode) 12 dB ±1.5 dB ±(0.3 dB + 0.03 dB/dB)
40 GHz +10 to –45 dBm (DC mode)
Q85026A5 33 to WR-22 +10 to –50 dBm (AC mode) 12 dB ±2.0 dB ±(0.3 dB + 0.03 dB/dB)
50 GHz +10 to –45 dBm (DC mode)
U85026A5 40 to WR-19 +10 to –50 dBm (AC mode) 12 dB ±2.0 dB ± (0.3 dB + 0.03 dB/dB)
60 GHz +10 to –45 dBm (DC mode)
85025CK-K577 50 to WR-15 +10 to –45 dBm (typical) 9.5 dB
75 GHz (typical)
85025CK-K717 75 to WR-10 +10 to –45 dBm (typical) 9.5 dB
110 GHz (typical)
85025C5
1. Option 001 changes to 7 mm connector.
2. –10 dBm, 25 ±5 °C
3. Dynamic accuracy refers to measurement accuracy as power varies (in dB)
from a 0 dBm reference. 25 ±5 °C, 50 MHz.
4. DC mode, 25 ±5 °C.
6
SMA (m)
6 6 6 6
5. The 85025 and 85026 series detectors and the 85025C detector adapter require
8757A firmware revision 2.0 or higher.
6. Depends on the detector.
7. Must be used with the 85025C detector adapter.
9
System accessories, continued
Directional bridges
Agilent 85027 series directional bridges (AC/DC)
The 85027 series directional bridges are designed to
operate with either the 8757 in AC or DC detection
modes or with the 8756 or 8755 in AC detection
mode. These bridges offer high directivity, excellent
test port match, and a measurement range of up
to 50 GHz in coax.
General information—directional bridges
Dynamic power accuracy
(50 MHz, 25 ±5 °C, +7 dBm input)
Typical insertion loss
6.5 dB at 10.0 MHz
8.0 dB at 18.0 GHz
10.0 dB at 26.5 GHz
11.0 dB at 40.0 GHz
13.0 dB at 50.0 GHz
Typical minimum input power for a 40 dB return loss
measurement at 18 GHz: +2 dBm
Dimensions: 26 H x 124 W x 118 mm D
(1.0 x 4.9 x 4.4 in)
Weight: Net 0.5 kg (1.2 lb), Shipping 2.3 kg (5 lb)
Accessories included with directional bridges:
85027A
7 mm open/short
Type-N (m)–(m) adapter
85027B
3.5 mm (m) open/short
3.5 mm (m)–(m) adapter
3.5 mm (m)–(f) adapter
85027C
Type-N (m) short
Type-N (m) shielded open
Type-N (m)–(m) adapter
85027D
2.4 mm (f) open
2.4 mm (f) short
85027E
3.5 mm (f) open/short
3.5 mm (f)–(f) adapter
3.5 mm (f)–(m) adapter
Directional Bridge Summary
For use with the 8757 in AC or DC detection mode or with the 8756 or 8755 in AC detection mode only
Frequency Nominal Input Test port Test port
Model range impedance connector connector Frequency Directivity Frequency match
85027A 10 MHz to 50 ohms Type-N (f) 7 mm 0.01 to 18 GHz 40 dB 0.01 to 8.4 GHz <1.15 SWR
18 GHz 8.4 to 12.4 GHz <1.25 SWR
12.4 to 18 GHz <1.43 SWR
85027B 10 MHz to 50 ohms 3.5 mm (f) 3.5 mm (f) 0.01 to 20 GHz 40 dB 0.01 to 8.4 GHz <1.15 SWR
26.5 GHz 20 to 26.5 GHz 36 dB 8.4 to 20 GHz <1.43 SWR
20 to 26.5 GHz <1.78 SWR
85027C 10 MHz to 50 ohms Type-N (f) Type-N (f) 0.01 to 12.4 GHz 36 dB 0.01 to 8.4 GHz <1.15 SWR
18 GHz 12.4 to 18 GHz 34 dB 8.4 to 12.4 GHz <1.25 SWR
12.4 to 18 GHz <1.43 SWR
85027D 10 MHz to 50 ohms 2.4 mm (f) 2.4 mm (m) 0.01 to 26.5 GHz 35 dB 0.01 to 16 GHz <1.18 SWR
50 GHz 16 to 30 GHz <1.27 SWR
26.5 to 40 GHz 30 dB 30 to 40 GHz <1.40 SWR
40 to 50 GHz 25 dB 40 to 50 GHz (typical) <1.85 SWR
85027E 10 MHz to 50 ohms 3.5 mm (f) 3.5 mm (m) 0.01 to 20 GHz 40 dB 0.01 to 8.4 GHz <1.15 SWR
26.5 GHz 20 to 26.5 GHz 36 dB 8.4 to 20 GHz <1.43 SWR
20 to 26.5 GHz <1.78 SWR
10
Power splitters
The Agilent 11667 series power splitters are tworesistor splitters recommended for external source
leveling or for ratio measurement applications.
General information
Impedance: 50 ohms nominal
Maximum input power: +27 dBm
Dimensions: 46 H x 52 W x 21 mm D
(1.8 x 2.0 x 0.8 in)
Weight: Net 0.14 kg (0.3 lb), Shipping 0.22 kg (0.5 lb)
Power dividers
The Agilent 11636 series power dividers are threeresistor splitters intended for direct power dividing applications such as transmission line fault
location. The 11636 series can also be used as a
power combiner.
General information
Impedance: 50 ohms nominal
Dimensions: 42 H x 45 W x 18 mm D
(1.6 x 1.8 x 0.7 in)
Weight: Net 0.14 kg (0.3 lb), Shipping 0.45 kg (1.0 lb)
Power splitters
Frequency Input Output Insertion loss Equivalent Output
Model range connector connectors Frequency (typical) output match tracking
11667A DC to 18 GHz Type-N (f)1 Type-N (f) DC to 4 GHz 6.6 dB 1.10 SWR 0.15 dB
4 to 8 GHz 7.0 dB 1.20 SWR 0.20 dB
8 to 18 GHz 7.8 dB 1.33 SWR 0.25 dB
11667B DC to 26.5 GHz 3.5 mm (f) 3.5 mm (f) DC to 8 GHz 6.5 dB 1.22 SWR 0.25 dB
8 to 18 GHz 7.0 dB 1.22 SWR 0.25 dB
18 to 26.5 GHz 7.3 dB 1.22 SWR 0.40 dB
11667C DC to 50 GHZ 2.4 mm (f) 2.4 mm (f) DC to 18 GHz 6.0 dB 1.29 SWR 0.30 dB
18 to 26.5 GHz 7.0 dB 1.20 SWR 0.35 dB
26.5 to 40 GHz 8.0 dB 1.50 SWR 0.40 dB
40 to 50 GHz 8.5 dB 1.65 SWR (typical) 0.40 dB
Power dividers
Frequency Input Output Output Output
Model range connector connectors Frequency match tracking
11636A DC to 18 GHz Type-N (m) Type-N (f) DC to 4 GHz 1.25 SWR 0.20 dB
4 to 10 GHz 1.25 SWR 0.40 dB
10 to 18 GHz 1.35 SWR 0.50 dB
11636B DC to 26.5 GHz 3.5 mm (f) 3.5 mm (f) DC to 10 GHz 1.22 SWR 0.25 dB
10 to 18 GHz 1.29 SWR 0.50 dB
18 to 26.5 GHz 1.29 SWR 0.50 dB
1. Option 001 changes the input connector to Type-N (m).
11
System accessories, continued
Agilent 11679A/B extension cables
These cables extend the distance between the
scalar network analyzer and the detector or bridge
to a maximum of 200 feet without degradation of
performance.
11679A 7.6 m (25 ft) extension cable
11679B 61 m (200 ft) extension cable
Agilent 11665B modulator
Note: This product is no longer available. The 11665B modulator is only
necessary when using the 8340/8341 series synthesizer.
The 11665B modulates test signals with the
27.8 kHz modulation drive signal from the scalar
network analyzer.
Frequency range: 15 MHz to 18 GHz
Insertion loss and return loss
Insertion loss
Frequency Return loss ON (+50 mA) OFF (–50 mA)
15 MHz to 40 MHz >10 dB <7.0 dB >35 dB
40 MHz to 4 GHz >15 dB <3.2 dB >35 dB
4 GHz to 8 GHz >12 dB <3.8 dB >40 dB
8 GHz to 12.4 GHz >8 dB <4.3 dB >45 dB
12.4 GHz to 18 GHz >8 dB <5.0 dB >45 dB
Agilent 85022A system cable kit
The 85022A contains the BNC and GPIB cables
needed to connect a source to the 8757.
Contents
GPIB cable, 100 cm (3.3 ft.), 3 each
50 ohm BNC (m) cable, 61 cm (2 ft.), 3 each
50 ohm BNC (m) cable, 122 cm (4 ft.)
Weight: Net: 0.5 kg (1.2 lbs.), Shipping: 1.2 kg (2.9 lbs)
Agilent 11613B calibrator
The 11613B is a dedicated transfer standard for
calibration of the 8757. The 11613B provides the
standard, a 27.778 kHz source, and a series of
precision attenuators. The calibrator includes
software (3.5-inch format) that operates on an
HP 9000 series 200 or 300 computer, the BASIC
operating system (BASIC 3.0 or higher), or an
external controller with HP BASIC for Windows 7.0
or higher. The software verifies (and adjusts if necessary) the internal calibration parameters stored
in the nonvolatile memory of the 8757. All 8757
detector inputs can be calibrated in a matter of
minutes. Recalibration of the 11613B is recommended every two years.
Maximum input: +24 dBm
Connectors: Input: Type-N (f), Output: Type-N (m)
Weight: Net: 0.17 kg (0.38 lbs), Shipping: 0.9 kg (2 lbs)
Memory requirement: 0.5 Mbyte
Outputs
The 5-pin cable (1.22 m) mates with the detector
inputs of the 8757. The lines in this cable transfer
the squarewave signal to the 8757, provide power
for the 11613B (from the 8757 supply), and program the 11613B’s internal attenuators.
Dimensions: 40 H x 185 W x 203 mm D
(1.5 x 7.3 x 8.0 in)
Cable length: 1.22 m (48 in)
Weight: Net: 0.91 kg (2 lbs), Shipping: 2.3 kg (5 lbs)
12
Web resources
Literature guide Pub. number
Visit our Web sites for additional product
information and literature.
Scalar Network Analyzers
www.agilent.com/find/8757
RF & MW Network Analyzers
www.agilent.com/find/na
Agilent 8757D scalar network 5967-6177E
analyzer, Configuration Guide
Improving network analyzer 5966-3318E
measurements of frequencytranslating devices,
Application Note 1287-7
Network analyzer measurements: 5965-7710E
filter and amplifier examples,
Application Note 1287-4
Microwave component measure- 5954-1599
ments; amplifier measurements
using the scalar network analyzer,
Application Note 345-1
Measuring voltage-controlled 5964-1537
devices with the Agilent 8757A
scalar network analyzer,
Product Note 8757-5
Improving scalar network analysis 5988-8432EN
using the PSG signal generator and
the 8757D scalar network analyzer,
Application Note 1435
13
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Revised: July 17, 2008
Product specifi cations and descriptions in this document
subject to change without notice.
© Agilent Technologies, Inc. 2002, 2003, 2005, 2008
Printed in USA, October 15, 2008
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