Agilent 8757D Technical Specifications

HP 8757D/E
Scalar Network Analyzers

Technical Specifications

10 MHz to 110 GHz

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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, Hewlett-Packard offers you a choice of microwave
scalar measurement solutions which provide an excel­lent balance of cost, system versatility, and
measurement precision.

Overview of features and differences

HP 8757E

• High resolution monochrome display

• Two display channels

• Three detector inputs

• Internal plotter/printer buffer

• +16 to –60 dBm dynamic range

• AC/DC detection modes

• 101 to 401 measurement points/trace

• Noise figure measurement display capability

• Cursor max and min search functions

• Compatible with the HP 85025 and 85026 series
detectors and the HP 85027 series directional bridges

HP 8757D

Includes all of the HP 8757E features, plus the following:

• High resolution color display

• Four display channels

• An optional fourth detector input (Option 001)

• An optional internal power calibrator (Option 002)

• Accurate power measurements with the HP 85037
series precision detectors

• External disk save/recall

• 101 to 1601 measurement points/trace

• 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.”

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HP 8757D/E
scalar network analyzers

HP 8757D/E scalar network analyzers

The HP 8757D has four independent display channels
that process the signals from the HP 85037 series pre­cision detectors (HP 8757D only), the HP 85025 and
85026 detectors, and the HP 85027 series directional
bridges for logarithmic display, in single channel or
ratio mode. Three (optionally four) detector inputs are
provided. The HP 8757E has two independent display
channels and three detector inputs.

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
HP 8757E 1, 2 101, 201, 401
HP 8757D 1 101, 201, 401, 801, 1601

2 101, 201, 401, 801
3, 4 101, 201, 401

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 (HP 8757D only)

Up to 8 operator-selectable colors are available for
CRT 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.

Number Minimum sweep time (ms)
of (log magnitude format)
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 NA NA
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 HP 8757D, calibra­tion data is interpolated when the frequency span
is decreased.

Limit lines (HP 8757D only)

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.

Internal save/recall registers

Up to 9 complete front panel states may be saved or
recalled. If the source (HP 8360 or 8370 series) is con­nected to the HP 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

(1/2/5 sequence)

dB 0.1 to 20 dB/div –90 to +90 dB 0.006 dB

1

(1/2/5 sequence)

Normalized 0.1 to 20 dB/div –180 to +180 dB 0.01 dB
ratio (1/2/5 sequence)
measurements

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 +10V 0.001V
Voltage (1/2.5/5 sequence)

1. 0.01 dB for display cursor

Modulation requirements

Applies to the HP 85037 series precision detectors,
HP 85025/26 series detectors, and HP 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.

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HP 8757D/E
network analyzer (cont'd)

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
HP 8757.

Voltage levels

Blanked: +5V typical
Unblanked: 0V typical
Marker: –4V typical
Active marker: –8V typical

Modulator drive

The modulator drive output of the HP 8757 scalar
analyzer provides the circuitry to drive the HP 8360/8370
series synthesized sweepers and the HP 11665B modu­lator. Modulation drive may be turned on and off via the
front panel or HP-IB. In the “off” state, the modulator
drive signal turns the HP 11665B fully on for minimum
insertion loss.

Frequency: 27,778 Hz ±12 Hz
Symmetry: 50% ±1%

Stop sweep

Used with the HP 8360 and 8370 series when controlled
by the HP 8757 system interface to stop the sweep at
band crossings and at the end of sweep.

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 an HP-IB controlled system.

Video outputs (HP 8757D only)

Used to drive an external color monitor that has the
following characteristics:

• Red, green, and blue (RGB) BNC inputs, sync on green

• 75 ohm input impedance

• 25.5 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)

HP-IB

Interface

HP-IB 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 HP 8757D/E is compatible with all appro­priate HP 8757A/C scalar analyzer programming codes.

User-accessible display graphics

HP-GL subset that allows user to display test setup
diagrams and operator instructions on the analyzer CRT .

Interrupts

HP-IB service interrupts (SRQs) are generated for the
following conditions:

• Front-panel key pressed

• Operation complete

• Illegal command

• Instrument self-test error

• Limit test failed

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System interface

The HP 8757 system interface is a dedicated HP-IB
port used exclusively by the HP 8757 to control and
extract information from a swept source, a digital plotter,
a printer, and a disk drive (HP 8757D only).

Compatible swept sources

The following swept sources are specifically made to
complement the HP 8757 system. With them, the HP 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:

• HP 8360 series synthesized sweeper

• HP 8370 series synthesized sweeper

Printers

For a list of compatible printers, consult our printer­compatibility guide Web page. Its URL location is
http://www.hp.com/go/pcg

Internal plotter/printer buffer

The HP-IB 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.

Disk interface (HP 8757D only)

The HP 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 HP-IB disk drive that is compatible
with command subset CS/80. Data files are stored in
Hewlett-Packard’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.

Recommended disk drive

HP 9122C dual 3.5 in disk drive (only available with
Option 802)

General information

Temperature range

Operating: 0 to 55°C
Storage: –40 to 75°C

Power requirements

48 to 66 Hz, 100/120/220/240V ±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 (HP 8757D Option 002 only)

The HP 8757D’s internal power calibrator provides a
50 MHz reference standard for characterizing the abso­lute power accuracy and dynamic power accuracy of the
HP 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)

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 HP 85037B (3.5 mm) precision detector.

Ordering information

HP 8757D scalar network analyzer

Option 001: adds fourth detector input
Option 002: adds internal power calibrator
Option 802: adds an HP 9122C dual 3.5 inch disk drive

and HP 10833A HP-IB cable.

HP 8757D/E options

Option 1BN: MIL-STD 45662A certificate of calibration
Option 1BP: MIL-STD 45662A certificate of calibration

with data