有人熟悉 安捷伦 agilent 和 罗德与施瓦茨 Rohde & Schwarz 等测试设备的开发吗? (SCPI 如何入门?)

[wzw]

问题:

1. SCPI 感觉有点难理解, 如何入门?
2. 我用用程序控制这些设备,进行测试. 那我应该如何完成最简单的一个测试步骤?(帮助理解 SCPI 流程)

1 目前看懂了 hello world 的例子, 连上了设备. 这个代码跑通

import visa

rm = visa.ResourceManager()
scope = rm.open_resource("TCPIP::192.168.2.2::5025::SOCKET")

# All these three settings are required for SOCKET and Serial connection
scope.write_termination = '\n'
scope.set_visa_attribute(visa.constants.VI_ATTR_TERMCHAR, 10)
scope.set_visa_attribute(visa.constants.VI_ATTR_TERMCHAR_EN, True)

scope.clear()  # Clear instrument io buffers and status
idn_response = scope.query('*IDN?')  # Query the Identification string

print 'Hello, I am ' + idn_response

---

2 但是开始测试的 SCPI 命令就有点难上手的感觉了. (这段卡不太懂了. 恶补中)

 RTO/RTE Oscilloscope example for Python using PyVISA

import visa
import VISAresourceExtentions

# -----------------------------------------------------------
# Initialization
# -----------------------------------------------------------
rm = visa.ResourceManager()
scope = rm.open_resource('TCPIP::10.85.0.119::INSTR')

# try block to catch any InstrumentErrorException() or InstrumentTimeoutException()
try:
    scope.write_termination = ''
    # Some instruments require LF at the end of each command. In that case, use:
    # scope.write_termination = '\n'
    scope.ext_clear_status()  # Clear instrument io buffers and status
    scope.write('*RST;*CLS;:SYST:DISP:UPD ON')  # Reset the instrument
    scope.write('*ESE 1')  # Event Status Enable OPC bit - one time setting after *RST
    scope.ext_error_checking()  # Error Checking

    # -----------------------------------------------------------
    # Settings all in one string:
    # -----------------------------------------------------------
    scope.write('ACQ:POIN:AUTO RECL;:TIM:RANG 2.0;:ACQ:POIN 1002;:CHAN1:STAT ON;:TRIG1:MODE AUTO')
    scope.ext_error_checking()  # Error Checking

    # -----------------------------------------------------------
    # Acquisition:
    # -----------------------------------------------------------
    print '\nAcquisition started...'
    scope.ext_write_with_srq_sync('SING', 6000)
    print 'Acquisition finished'
    # -----------------------------------------------------------
    # Selftest:
    # -----------------------------------------------------------
    print '\nSelftest started...'
    scope.ext_query_with_srq_sync('*TST?', 120000)
    scope.ext_error_checking()  # Error Checking
    print 'Selftest finished...'

    print 'Finished'

except VISAresourceExtentions.InstrumentErrorException, e:
    # Catching instrument error exception and showing its content
    print 'Instrument error(s) occurred:\n' + e.message

except VISAresourceExtentions.InstrumentTimeoutException, e:
    # Catching instrument error exception and showing its content
    print 'Timeout error(s) occurred:\n' + e.message

有没有这方面入门经验的分享一下, 感觉 SCPI 命令好难懂.

谢谢

[v2byy]

看开发手册啊，做自动化测试吗

[wzw]

@v2byy #1 很多测试只能半自动吧. 正在看手册... 感觉有点怪怪的. 不如 python node js php .net C 好理解. 也可能我刚开始

[wzw]

一个回复，三个收藏+++

[fsdafsag]

只会用 labview 控制，一般都有范例可以改或者 DLL 可以调用， 再不济也可以根据通讯协议通过 scpi 模块来通讯。