The 77BN was my favorite Multimeter👍I was issued a 77BN at my job. I had to swap it out every year to be calibrated. We had 8 of them at work. The Boss got them 20+ years ago from the U.S.Navy surplus yard. I think they were crazy cheap. Like $100 for the whole case of 8 brand new meters. Unfortunately I had to give it back when I retired🖖😎☮
Glad you like the video - I'm not really an expert on the 77s but I would expect to need to clean the function-range switch and the edges of the zebra strips, and clean the metal pads on the circuit board where they touch. The zebra strips also have connection inside the lcd module but I haven't quite had the nerve to tear one of those modules apart. Make sure the input jacks are tight and there are no burned resistors or blown foil runs.
Thanks! Just got one for cheap, even if there is no LCD output. Hopefully it will work again with your tip. Is there anything else one should think about when repairing them?
I recently saw a Fluke 77 ET-77 DMM MAC for sale online. Anyone know what the ET stands for? I know DMM stands for digital multimeter and the MAC letters on the meter were similar in appearance to the lettering style used by MAC Tools, so I'm thinking the meter may have been issued to that company, but that's just a guess on my part.
Mark, My 21 just bit the dust after 15 years. I'm thinking of getting a 77 but the one I'm looking at has that BN. What is a BN? It threw me off because I never noticed those letters. Hey also whats the differences in a 21 and a 77? I bet you'd know. Thanks.
BN was a military designation, made for the Marine Corps. AN was Army. I think the 21 was the same as a 75. The 77 was the same as a 23 but the 23 was yellow. If you are buying one now, might be the time to think about True RMS. I recently had a deal where my 77 lied to me by about 40% on a current measurement because it wasn't true RMS. An 85III can be had for 100.00 or less on eBay for example. There lots of newer True RMS non-Flukes but overall many kinda fail, especially on the auto-hold thing. Don't forget though, the 83 is NON RMS. Need the 85 or 87 or above to get true RMS (or 180 or 280 etc). A 27 FM is like a 77 on steroids and does True RMS. Make sure it's the FM version though.
Thanks Mark! I was Army... I'll have to look for the AN. I can appreciate the True RMS but I do plant start ups so it won't hurt me too bad. Lots of 4-20mA and 120 on and off. My 21 has been my crash around meter for so long I think I'll just get another 21 or 77. I hate change lol. Maybe I'll take the money I save and get a new DC amp clamp. I have bulkier meters that belong to the company that should be True RMS. A 789 I think. I run around too much to carry my process meter.
The 77BN was my favorite Multimeter👍I was issued a 77BN at my job. I had to swap it out every year to be calibrated. We had 8 of them at work. The Boss got them 20+ years ago from the U.S.Navy surplus yard. I think they were crazy cheap. Like $100 for the whole case of 8 brand new meters. Unfortunately I had to give it back when I retired🖖😎☮
Thanks for the review Sir!!!
Thank you for the review sir!
Glad you like the video - I'm not really an expert on the 77s but I would expect to need to clean the function-range switch and the edges of the zebra strips, and clean the metal pads on the circuit board where they touch. The zebra strips also have connection inside the lcd module but I haven't quite had the nerve to tear one of those modules apart. Make sure the input jacks are tight and there are no burned resistors or blown foil runs.
Great score!
Picked one up for 15 dollars today at a local pawn shop great multimeter!
Thanks! Just got one for cheap, even if there is no LCD output. Hopefully it will work again with your tip. Is there anything else one should think about when repairing them?
I recently saw a Fluke 77 ET-77 DMM MAC for sale online. Anyone know what the ET stands for? I know DMM stands for digital multimeter and the MAC letters on the meter were similar in appearance to the lettering style used by MAC Tools, so I'm thinking the meter may have been issued to that company, but that's just a guess on my part.
+Davilo Olivad MAC is a good guess or maybe a custom order for a tech school chain. Fairly common practice.
Re-edited and re-uploaded 6-24-11.
Mark, My 21 just bit the dust after 15 years. I'm thinking of getting a 77 but the one I'm looking at has that BN. What is a BN? It threw me off because I never noticed those letters. Hey also whats the differences in a 21 and a 77? I bet you'd know. Thanks.
BN was a military designation, made for the Marine Corps. AN was Army. I think the 21 was the same as a 75. The 77 was the same as a 23 but the 23 was yellow. If you are buying one now, might be the time to think about True RMS. I recently had a deal where my 77 lied to me by about 40% on a current measurement because it wasn't true RMS. An 85III can be had for 100.00 or less on eBay for example. There lots of newer True RMS non-Flukes but overall many kinda fail, especially on the auto-hold thing. Don't forget though, the 83 is NON RMS. Need the 85 or 87 or above to get true RMS (or 180 or 280 etc). A 27 FM is like a 77 on steroids and does True RMS. Make sure it's the FM version though.
Thanks Mark! I was Army... I'll have to look for the AN. I can appreciate the True RMS but I do plant start ups so it won't hurt me too bad. Lots of 4-20mA and 120 on and off. My 21 has been my crash around meter for so long I think I'll just get another 21 or 77. I hate change lol. Maybe I'll take the money I save and get a new DC amp clamp. I have bulkier meters that belong to the company that should be True RMS. A 789 I think. I run around too much to carry my process meter.
is the Fluke 77 series II true RMS?
+RJ L The 77 and the series II are average responding not True RMS.