Agilent 8757D：经济高效微波 scalar network analyzer 实用入门指南

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Agilent 8757D是一款高级的 Scalar Network Analyzer (矢量网络分析仪)，专为微波和射频领域的测量设计。它旨在满足用户对传输和反射特性精确测量的需求，是初学者和专业工程师的理想选择。该仪器以其卓越的性能、成本效益和系统灵活性而受到认可。该设备的关键特性包括： 1. **四显示通道**：8757D拥有四个独立的显示通道，能够同时进行多路信号的测量与分析，提高了工作效率。 2. **三个及可选的四个探测器输入**：仪器配置了基础的三个探测器接口，可扩展至四个，支持灵活连接多种测试设备。 3. **内置功率校准器**：作为标准配置，提供了准确的功率测量能力，配合Agilent 85037系列精密探测器，确保了测量精度。 4. **高分辨率彩色显示器**：直观清晰的图形显示，便于用户理解和解读复杂的测量数据。 5. **内部绘图器和打印机缓冲**：内置的绘图功能和打印功能，方便用户即时记录和存档测量结果。 6. **宽动态范围**：+16 dBm到-60 dBm的动态范围，适用于各种信号强度的测量场景。 7. **AC/DC检测模式**：适应不同类型的信号源，无论是交流还是直流，都能有效捕捉。 8. **测量点/迹线**：高达101到1601个测量点，保证了精细的频率分辨率和数据密度。 9. **噪声系数测量**：具备噪声系数的测量显示功能，有助于评估系统的信噪比。 10. **兼容性**：与Agilent 85025、85026系列探测器和85027系列定向桥搭配使用，扩展了仪器的适用性。 11. **特性测试功能**：针对通道1和2提供限值线测试，用于验证信号的正常范围。 12. **自适应标准化**：通过智能算法自动调整测量条件，确保结果的准确性。 13. **光标搜索功能**：支持最大值、最小值、dB值以及带宽等多种搜索方式，便于快速定位关键参数。规格部分详细描述了仪器在特定温度范围内的性能保证，这表明Agilent 8757D不仅提供出色的测量工具，而且有可靠的质量控制标准。对于从事微波通信、雷达、无线通信等领域研究或维护的工程师来说，这款仪器是一个强大且实用的伙伴。

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

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 detec-

tors, 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

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.

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)

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