我有一个85054B校准套件。如果我使用连接器量规检查套件中的N标准和适配器，则量具表明一切都在规格范围内，但一个适配器略微超出规格（我将替换它）。如果我用旧的85032B校准套件检查设备，那么事情看起来还不错。所以这些量具似乎可以与惠普/安捷伦设备配合使用。但我似乎发现几乎所有非HP / Agilent连接器都不符合规范。我有两条VNA级测试电缆，带有N型连接器，每端都是Flexco Microwave。这些是昂贵的电缆，所以我不希望发现所有4个公N连接器都超出规格。在4个连接器中，都显示进动，但从连接器到连接器有很多不同。在一根电缆上，两端的进动是* 0.0039“* 0.0136”而在另一根电缆上* 0.0144“* 0.0132”我检查了一个使用过的Radiall衰减器的两端，并且它再次看起来是英里外的。这些应变计对于它们使用的连接器是否挑剔？根据该方框，量具的零件编号为85054-80011，与Agilent 85054B套件的当前手册不同，后者列出了设置为85054-60049的量具。我附上了一套量具。如果您只能检查HP / Agilent部件，则会降低量具的实用性。 DaveEdited：drkirkby于2014年1月17日下午10:53 以上来自于谷歌翻译 以下为原文I've got an 85054B cal kit. If I check the N standards and adapters in the kit using the connector gages, the gages indicate everything is within spec, with the exception of one adapter that is slightly out of spec (I'll replace that). If I check the devices in an old 85032B cal kit, again things look ok. So the gages seem to work fine with HP/Agilent devices. But I seem to find almost every non-HP/Agilent connector is *way* out of spec. I have for example two VNA grade test cables with male N connectors each end from Flexco Microwave. These are expensive cables, so I would not expect to find all 4 male N connectors to be out of spec so much. Of the 4 connectors, all show precession, but differing a lot from connector to connector. On one cable, the precession at the two ends are * 0.0039" * 0.0136" And on the other cable * 0.0144" * 0.0132" I checked both ends of a used Radiall attenuator, and again it appears to be miles out. Are these gages fussy about what connectors they work with? According to the box, the part numbers for the gage set are 85054-80011, which is different to the current manual for the Agilent 85054B kit, which lists the gages set as 85054-60049. I've attached a picture of the gages. It rather reduces the usefulness of the gages if you can only check HP/Agilent parts with them. DaveEdited by: drkirkby on Jan 17, 2014 10:53 PM附件another-view-of-gages-from-85054B-cal-kit.jpg352.7 KB
2018-11-23 10:16
in digital noise margin, but it isusually acceptable with TTL or CMOS logic if it’s less than afew hundred
2018-11-27 09:09
dm365_afew_hw_init ch0 default output "COMPOSITE", mode "PAL" VPBE Encoder Initialized
2018-05-28 08:57
本帖最后由 一只耳朵怪 于 2018-5-29 14:40 编辑 嗨喽，我有一个DM368的开发板，使用的sensor为MT9P031。我有将内核make menuconfig 里的其他解码器去掉。选中MT9P031有在static struct vpfe_subdev_info vpfe_sub_devs[] 添加.module_name = "mt9p031", .is_camera = 1, .grp_id = VPFE_SUBDEV_MT9P031, .num_inputs = ARRAY_SIZE(mt9p031_inputs), .inputs = mt9p031_inputs, .ccdc_if_params = [ .if_type = VPFE_RAW_BAYER, .hdpol = VPFE_PINPOL_POSITIVE, .vdpol = VPFE_PINPOL_POSITIVE, ], .board_info = [ I2C_BOARD_INFO("mt9p031", 0x5d), /* this is for PCLK rising edge */ .platform_data = (void *)1, ], ],我的bootargs为setenv bootargs dm365_imp.oper_mode=0 mem=48M console=ttyS0,115200n8 noinitrd rw ubi.mtd=3 root=ubi0:rootfs rootfstype=ubifs video=davincifb:osd0=720x480x16,4050K davinci_capture.device_type=4;现在内核启动信息出现问题为：i2c /dev entries driverLinux video capture interface: v2.00ths7303 1-002c: chip found @ 0x58 (DaVinci I2C adapter)ths7303 1-002c: ths7303 write failedths7303: probe of 1-002c failed with error -121vpfe_initvpfe-capture: vpss clock vpss_master enabledvpfe-capture vpfe-capture: v4l2 device registeredvpfe-capture vpfe-capture: video device registeredEVM: switch to tvp7002 HD video inputvpfe-capture vpfe-capture: v4l2 sub device ths7353 register failsdm365evm_enable_pca9543adm365evm_enable_pca9543a, status = -121EVM: switch to HD imager video inputmt9p031 1-0055: No MT9P031 chip detected, register read ffffff87vpfe-capture vpfe-capture: v4l2 sub device mt9p031 register failsNo sub devices registeredvpfe-capture: vpfe capture clocks disabledvpfe_register_ccdc_device: DM365 ISIFdm365_isif: probe of dm365_isif failed with error -22请问该如何解决呢？
2018-05-28 08:28
