万用表显示测量值不正确
Fluke 77 Series III 万用表的测量值没有以你想要的单位显示——例如，你的电压测量值以千伏 (kV) 为单位，而不是以伏特 (V) 为单位。
量程问题
如果你的万用表没有以正确的单位显示测量值，你可以通过反复按“RANGE”（量程）按钮将万用表设置为不同的量程。如果还没启用“HOLD”（保持）功能，你也可以通过按两次“HOLD”按钮将万用表设置为自动量程。如果已启用“HOLD”，你可以通过按一次“HOLD”按钮来设置自动量程。保持模式会获取并显示功能下的稳定测量值。
万用表无法开机
即使将旋钮转到测量模式，Fluke 77 Series III 万用表的显示屏上也没有任何电源迹象。
电池没电
如果万用表无法开机，可能是其中的 9V 电池没电了，你可能需要更换它。
PCA 损坏
如果万用表无法开机，可能是 PCA（印刷电路板组件）损坏了。作为最后的手段，你可能需要更换 PCA。
万用表显示错误消息
你的 Fluke 77 Series III 万用表显示错误消息，而不是正确测量。
电池电量不足
如果你的万用表显示错误消息，电池电量可能不足。电池电量不足可能会导致 LCD 显示屏上的所有元件变暗。如果电池电量不足，也可能会显示“0L”消息。你将需要更换 9V 电池。
PCA 损坏
如果你的万用表显示错误消息，说明万用表可能从根本上损坏了。如果更换电池无效，则需要更换 PCA。
没有错误消息，但万用表不进行测量
你的 Fluke 77 Series III 万用表已开机，但在将表笔插入万用表的插孔并将探头连接到电路的相应部分后，LCD 显示屏没有任何变化。
表笔位置错误
如果万用表不进行测量且没有错误消息，你可能将表笔插在了万用表错误的插孔中。对于 Fluke 77 Series III 万用表，标记为“COM”的黑色输入插孔（右下角）始终是任何类型测量的接地端。然而，标记为“V”和欧姆符号的红色输入插孔（右上角）仅为电压、电阻和二极管测量的正极输入。300 mA 输入插孔（左上角）是任何低于 300 mA 电流的正极输入，而 10 A 输入插孔（左下角）是任何低于 10 A 电流的正极输入。请记住使用所需的最小电流值插槽，并且绝对不要超过设备的能力。
旋钮位置错误
如果万用表不进行测量且没有错误消息，你可能将旋钮设置成了错误的测量模式。例如，如果你想测量 100 mA 的直流电流，你应该将旋钮设置到距离“关”位置的最后一个测量选项。你可能将输入表笔插在了正确的位置（300 mA 和 COM），但如果你将旋钮设置到直流电压（距离“关”位置的第二个选项）或交流电流（距离“关”位置的倒数第二个选项），你将无法正确测量或完全无法测量。
表笔脏了
如果万用表不进行测量且没有错误消息，输入端口或表笔可能脏了。你可以按照 Fluke 77 Series III 万用表维修手册 中的说明清洁万用表。
表笔损坏
如果万用表不进行测量且没有错误消息，万用表表笔可能损坏，你需要购买一副新的。请确保只使用按照 Fluke 77 Series III 万用表维修手册 规定可与该万用表配合使用的表笔。
一个或两个保险丝损坏
如果万用表不进行测量且没有错误消息，说明你的万用表至少有一个保险丝可能损坏，你将需要更换任何损坏的保险丝。记住：绝对不要使用 Fluke 77 Series III 万用表测量大于所用输入端口允许的最大电流的交流/直流电流。
万用表读数的一个或多个段没有显示
你开启了 Fluke 77 Series III 万用表并使用它来测量电路中的值。万用表似乎在工作，但显示屏没有显示完整的值。七段式 LCD 显示屏上缺少输出的某些段或整个字符。
LCD 损坏
如果万用表测量值的某些段没有显示，你 Fluke 77 Series III 万用表上的 LCD（显示屏）可能已部分或全部损坏。你将需要更换 LCD。
按钮失灵
你尝试按下 Fluke 77 Series III 万用表上的 RANGE 或 HOLD 按钮，但其中一个或两个按钮都没有反应。
按钮卡住
如果按钮失灵，按钮可能是卡住了，你将需要重新安装或更换它们。
PCA 的输入端损坏
如果按钮失灵，你万用表 PCA 的输入/输出功能可能已损坏。你将需要更换 PCA。
旋钮失灵
你尝试转动万用表的旋钮来开机、关机或更改测量模式，但旋钮没有改变显示、错误地改变显示，或以其他方式失灵。
旋钮卡住
如果旋钮失灵，旋钮可能是卡住了，你将需要重新安装或更换它。
旋钮无法改变显示
如果旋钮失灵，显示屏可能已损坏。你将需要更换 LCD。
PCA 的输入端损坏
如果旋钮失灵，PCA 的输入/输出功能可能已损坏。你将需要更换 PCA。
以上皆非
以上类别均不符合你的问题，或者你尝试了上述修复方法但没有奏效。
还有许多资源可供你使用，以诊断或修复你的 Fluke 77 Series III 万用表。请查阅 Fluke 77 Series III 万用表制造商支持资料，以获取更多维修建议以及有关零件更换、测试和清洁的指南。Fluke 77 Series III 万用表说明书 是了解如何使用万用表并修复其基本问题的另一个有用资源。如果一切方法都失败了，你可以查找 Fluke 77 Series III 万用表制造商设备页面，以获取更多信息并联系 Fluke 公司。
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11条评论
My Fluke 77111 has blew a fuse and after replacing the fuse , the display was ok but will not read anything ,then i found this site and check out a few trouble shooting tips ,found out that my black lead was shorted , swapped lead and now I am good to go .
Thanks for this site .
jai - 回复 分享
I don’t like fluke 77 much. I like more Fluke 87 series especially Fluke 87V https://bestmultimeterreviews.org/fluke-... multimeter.
Gobri - 回复 分享
Part 1 This is more of a Safety Recall notice… In 1991 +- the Fluke 77 and the Fluke 77 AN/BN Military version had a fault… Fluke the Multimeter people tied to save pennies in the early 90's... A Engineer designed the Fluke 77 and when it went to production retired proud of his new product. The New Engineer was given a challenge to see if he could save Fluke some money... He was asked to look for any unnecessary components. He found some surface mount capacitors and he ordered them removed as he felt they were not needed... The Navy was a big user of the Fluke 77, I have had a few over the years. Even Sony had hundreds when I worked in the Calibration Lab. So sometime in the early 90's Technicians were getting shocked and killed.... Touching a energized electrical circuit... Mostly 450 volt AC. Fluke 77 Meters were involved... Finally 2 Tech's working together measured a circuit and it showed 000 on the Fluke 77. They both measured it... BOOM... DEAD TECHNICIAN.
digitalwoodshop - 回复 分享
Part 2 Based on the Surviving Tech Fluke was contacted and they were able to duplicate the 000 with the same meter.... The meter had the missing Capacitors to save money... It turns out that if the tech put the black lead on the 450 volt first then the red lead it would cause the meter to lock up at 000. Red lead first no problem.... I first heard of the recall my last 4 years in the Navy. The Electronic Tech's came to every shop and ship on base in San Diego checking Serial Numbers. They sent them in for the fix. A melted "R" in front of the serial number = a FIXED Meter... So I get to Sony in 1995 and in my 3rd and 4th year work in the Calibration Lab. First week I was sent off to LA to Fluke Calibration School. I asked about the recall and the Instructor told us the whole story I never heard in the Navy. So I go back to Sony and find over 50 meters in the Calibration Data Base that I sent out for repair.
digitalwoodshop - 回复 分享
Part 3 Then talking to a Former Coworker Mechanic about the meters, he was Retired Navy he mentioned he had a Fluke 77 in his Sony Tool Box not on the calibration list... Troubleshooting meters were not required to be calibrated only meters used in the Manufacturing process... So I put the word out and I find another pile of Fluke 77' in mechanics tool boxes... I get them fixed and add them to the Calibration Data Base... That way they get a fresh battery every year... If you call FLUKE today with a Fluke 77 Serial Number and it needs the FIX they no longer have the parts... They will send you a FREE METER..... Here is a picture off the internet showing a FLUKE 77.... The KILLER METERS..... SO in the end it cost Fluke a lot of money....
digitalwoodshop - 回复 分享