8664A硬件故障

你好 - 即使衰减器的精度非常可重复，但是有一个包含Cal常数的EEPROM，可以进行精确的功率设置。
当更换衰减器时，应该使用EEPROM;
EEPROM与衰减器匹配。
多年来，由于机械衰减器的可重复性，通常不需要更换EEPROM。
许多衰减器已经单独更换，没有考虑更换EEPROM。
然而，经常出现漂移或仅有轻微差异，更换的衰减器不会或不再满足诊断或校准期间使用的预期EEPROM校验和算法，从而导致错误。
此校验和错误可能非常小，因此不会影响设备的实际功能。
其他时候存在可察觉的问题。
完成仪器级别诊断（ILD）并且结果为+ 6,030，nnn后，设备需要修复才能使设备恢复全部功能。
当然，如果单元仍然满足特定应用程序的用户需求，那么只接受错误并监视任何未来的降级可能是可以接受的.Regards -



     以下为原文

  Hello -

Even though the accuracy of the attenuators are very repeatable there is a EEPROM that contains the Cal Constants that allow for precision power settings.  When the attenuators are replaced so should the EEPROM; EEPROM is matched to the attenuators.  Over the years the replacing of the EEPROM has typically not been mandatory due to the repeatability of the mechanical attenuators.  Many attenuators have been individually changed without thought to replacing the EEPROM. However, every so often either from drift or just a slight difference, replaced attenuators don’t or no longer meet the expected EEPROM checksum algorithm used during diagnostics or calibration and thus causing a error.  This checksum error can be quite small thus not impacting the actual functionality of the unit.  Other times there is a perceivable problem.  After completing Instrument Level Diagnostics (ILD) and the results is +6,030,nnn then the unit requires repairing to return the unit to full functionality.  Of course, if the unit is still meeting the needs of the user for a particular application then just accepting the error and monitoring for any future degradation may be acceptable.

Regards -

嗨，谢谢你的回复。
该装置具有机械衰减器，发电机内无任何设施可验证其准确性 - 这些衰减器是继电器驱动的，不提供智能反馈。
我了解EEPROM并且它包含安装的特定衰减器组的校准常数（偏移）。
这个EEPROM和衰减器都是原始部件。您是否建议此EEPROM可能已损坏且其校验和不再检出？
这会导致错误代码6,030,311？您知道是否有可用的默认EEPROM？
我知道这可能会导致校准误差很小，但是比更换衰减器组件便宜得多吗？感谢您的帮助！



     以下为原文

  Hi, and thanks for the reply. This unit has mechanical attenuators and there is no facility within the generator to verify their accuracy - these attenuators are relay actuated and provide no intelligent feedback. I understand about the EEPROM and that it contains calibration constants (offsets) for the particular set of attenuators installed. This EEPROM and the attenuators are all the original parts.

Are you suggesting that this EEPROM may have become corrupted and its checksum no longer checks out? This would cause error code 6,030,311?

Do you know if there Is there a default EEPROM available? I recognize this may result in a small calibration error but would be considerably less expensive than replacing the attenuator assy?

Thanks for your help!

嗨 - 不一定表明EEPROM已经改变，但诊断/校准算法中的某些内容可能有，衰减器和EEPROM都是其中的一部分。
过去的故障表明机械衰减器更可能比EEPROM略有变化。
如我的初始响应中所示，更换单个衰减器，当作为正确的更换部件订购时，将附带相应的EEPROM。
但是，如果衰减器按其自己的P / N排序，则不提供EEPROM。
没有更换EEPROM的大部分替换工作都没有错误。
然而，有些情况下新的衰减器和旧的EEPROM不兼容并且显示了+ 6,030，nnn。在8664A的生产年份，衰减器可以自己获得，因为多年来它已被用于许多
不同的产品和应用，其中一些不需要使用EEPROM。
EEPROM从未被设置为独立的替换部件，因为这个源应用程序;
它与特定的衰减器齐头并进。
8664A现在已经失去支持，部分可用性可能会受到质疑。



     以下为原文

  Hi -

Not necessarily suggesting the EEPROM has changed but something within either the diagnostic/calibration algorithm likely has, which both the attenuator and the EEPROM are part of.  Past failures indicate that It is more likely that the mechanical attenuator has changed slightly than the EEPROM.  As indicated in my initial response, replacing the individual attenuator, which when ordered as the correct replacement part comes with the appropriate EEPROM.  If however, the attenuator is ordered by its own P/N then no EEPROM is provided.  The majority of these replacements where the EEPROM was not replaced worked just fine without errors.  However, there have been cases where the new attenuator and old EEPROM were not compatible and the +6,030,nnn was displayed.

During the production years of the 8664A, the attenuator could be obtained by itself because over the years it had been used in many different products and applications, some of which do not require the use of an EEPROM.  The EEPROM was never setup as a standalone replacement part because for this source application; it goes hand in hand with a specific attenuator.  The 8664A now is out of support and part availability may be in question.

衰减器板上没有什么东西 - 只有2个衰减器组件和反向电源保护电路。
衰减器直接连接在信号的RF输出电路和前面板上的RF输出连接器之间（通过RPP检测器和簧片继电器）。
衰减器工作正常，因为输出电平在整个范围内都是准确的。
没有任何设施（在单元内）来测量这些衰减器的精度 - 如果它们的值漂移，则该单元无法自行检测。
事实上，我可以拔掉这些衰减器，错误检查结果不变。
我的理解是EEPROM通过存储这些衰减器的偏移值来校正在工作频率范围内的6个衰减器部分（每个衰减器总成中3个）的累积误差。
一旦启动自检，就会标记此错误消息。
自检例程需要几分钟才能运行，所以我怀疑它是非常基本的东西 - 可能是你建议的校验和错误？
或者也许RPP正在标记某些错误，但仪器没有显示RPP已经跳闸。
也许RPP探测器也用于检测仪器本身的输出功率，这有缺陷吗？
仪器还报告硬件故障6和校准故障2，但我假设这些都是因为指示了一个错误代码？
没有其他错误代码。非常感谢您的帮助！
一个替代的衰减卡总成约5000美元，就像我说的 - 衰减器工作正常。
没有详细的原理图似乎可用，所以它使故障排除变得困难！由于这个板上的电路很少，我对指向这个组件的错误代码的数量感到有些惊讶。
如果每个错误代码都有更多的信息，那就太好了。



     以下为原文

  There really is nothing much on the attenuator board - just 2 attenuator assemblies and the Reverse Power Protection circuitry. The attenuators are wired directly between the RF output circuits of the sig gen and the RF output connector on the front panel (via the RPP detector and a reed relay). The attenuators work fine as the output level is accurate over the full range. There is no facility (within the unit)to measure the accuracy of these attenuators - if they were to drift in value the unit has no way of detecting this by itself. In fact I can unplug these attenuators and the error check results are unchanged. My understanding is that the EEPROM corrects for the accumulated error of the 6 sections of attenuator (3 in each attenuator assy) over the operating frequency range by storing offset values for these.

This error message is flagged almost as soon as the self test is initiated. The self test routine takes several minutes to run so I would suspect it is something quite basic - possibly a check sum error as you suggest? or perhaps the RPP is flagging something is wrong but the instrument does not show RPP has tripped. Perhaps the RPP detector is also used to detect output power from the instrument itself and this is defective?

The instrument also reports hardware failure 6 and calibration failure 2 but I am assuming these are both because of the one error code indicated? There are no other error codes.

I really appreciate your help with this! A replacement attenuator card assy is ~$5,000 and like I said - the attenuators are working fine. No detailed schematics seem to be available so it makes troubleshooting difficult!

With so little circuitry on this board I was somewhat surprised at the number of error codes that point to this assembly. It would be nice if a bit more info was available on each of the error codes.

这里有更多信息......仪器级诊断（ILD）产生'+'6,030,311（带+）。我移除了校准EEPROM，上电后我得到了与安装它相同的错误代码 - 没有区别！
监视该EEPROM的芯片使能，直到非常接近上电校准程序结束时才会读取它。
这很重要，因为错误消息标志几乎是在开机校准程序开始时设置的，所以我认为这是非常基本的失败。
我还监控RF输出（为衰减器组件提供信号）并确认它在开机校准期间静音，因此我建议RPP探测器可能用于检测信号输出功率是无效的。我只能
另一个想法是它可能是校准EEPROM中存在故障的逻辑。按下预置按钮总是设置'MSG'信号器，它返回硬件错误6和校准错误2.无论运行什么例程，它都不能访问校准EEPROM。
all - 芯片启用没有任何活动。



     以下为原文

  Here's a little more info...
Instrument Level Diagnostics (ILD) yields  '+'6,030,311 (with a +).
I removed the calibration EEPROM and I get the same error code after power up as I do with it installed - no difference!
Monitoring the chip enable for this EEPROM it does not appear that it is read until very close to the end of the power up calibration routine. This is significant because the error message flag is set almost as soon as the power on calibration routine begins so I think it is something very basic that is failing.

I also monitored the RF out (that feeds the attenuator assy) and confirmed that it is muted for the duration of the power on calibration so my suggestion that the RPP detector might be being used to detect sig gen output power is not valid.

My only other idea is that it is perhaps the logic surounding the calibration EEPROM that is faulty.

Pressing the preset button always sets the 'MSG' annunciator which returns Hardware error 6 and calibration error 2. Whatever routine this runs it is not accessing the calibration EEPROM at all - there is no activity on the chip enable.