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Fluke 77 Series III Troubleshooting

The multimeter is not displaying the measurements correctly

The Fluke 77 Series III Multimeter's measurements are not displaying in your desired units - for example your voltage measurements are in kilovolts (kV) rather than Volts (V).

Range issues

If your multimeter is not displaying measurements in the correct units, you can set the multimeter to a different range by repeatedly pressing the "RANGE" button. You can also set the multimeter to automatic ranging by pressing "HOLD" twice, if Hold is not already enabled. If Hold is enabled, you can set automatic ranging by pressing "HOLD" once. The Hold mode takes and displays stable measurements for functions.

The multimeter is not powering on

The Fluke 77 Series III Multimeter is showing no signs of power in the display even after the dial is turned to a measurement mode.

The battery is dead

If the multimeter does not turn on, its 9V battery may be dead and you may need to replace it.

The PCA is damaged

If the multimeter is not powering on, the PCA may be damaged. As a last resort, you may have to replace the PCA.

The multimeter is displaying an error message

Your Fluke 77 Series III Multimeter displays an error message instead of correctly measuring.

The battery is low

If your multimeter is displaying an error message, the battery may be weak. A weak battery may cause every element on the LCD Display to darken. The message "0L" could also display if the battery is weak. You will have to replace the 9V battery.

The PCA is damaged

If your multimeter is displaying an error message, the multimeter may be fundamentally damaged. The PCA needs to be replaced if changing the battery does not work.

There are no error messages, but the multimeter is not measuring

Your Fluke 77 Series III Multimeter is powered on, but after you connect your leads into the input holes of the multimeter and connect the probes to the desired part of your circuit, the LCD Display does not change.

Your leads are in the wrong locations

If the multimeter is not measuring and there are no error messages, you might have the leads in the wrong sockets on the multimeter. For the Fluke 77 Series III Multimeter the black labelled "COM" input (bottom right) is always ground for any type of measurement. However, the red labelled input with the "V" and Omega symbol (top right) is the positive input only for voltage, resistance, and diode measurements. The 300 mA input (top left) is the positive input for any current below 300 mA and the 10 A input (bottom left) is the positive input for any current below 10 A. Remember to use the minimum current value slot necessary, and also to never exceed the device's capabilities.

The dial is in the wrong position

If the multimeter is not measuring and there are no error messages you may have set the dial to the wrong measuring mode. For example if you want to measure 100 mA of DC current, you should have the dial set to the last measuring option from "off". You may have the input leads in the correct spots (300 mA and COM), but if you have the dial set to DC Voltage (second option from off) or AC Current (second to last option), you will measure incorrectly or not at all.

The leads are dirty

If the multimeter is not measuring and there are no error messages, the input ports or leads could be dirty. You can clean the multimeter according to the instructions on the Fluke 77 Series III Multimeter Service Manual.

The leads are broken

If the multimeter is not measuring and there are no error messages, the multimeter leads may be broken and you will need to get a new pair. Make sure to only use leads with the multimeter that are accepted for use with it according to the Fluke 77 Series III Multimeter Service Manual.

One or both of the fuses are broken

If the multimeter is not measuring and there are no error messages, at least one of your multimeter's fuses may be broken and you will need to replace any broken fuse(s). Remember: never use the Fluke 77 Series III Multimeter to measure AC/DC current greater than maximum current allowed for the input port you are using.

One or more segments of the multimeter's readout is not displaying

You turn on your Fluke 77 Series III Multimeter and use it to measure a value in a circuit. The multimeter seems to be working, but the display is not showing the entire value. Segments, or whole characters, of the output are missing from the seven segment LCD display.

The LCD is damaged

If a segment of the multimeter measurements are not displaying, the LCD (display) on your Fluke 77 Series III Multimeter may be partially or fully damaged. You will need to replace the LCD.

The buttons are not working

You try to press the RANGE or HOLD button on your Fluke 77 Series III Multimeter, but one or both of them do not do anything.

The buttons are jammed

If the buttons are not working, the buttons may be jammed and you will need to reinstall or replace them.

The input on the PCA is broken

If the buttons are not working, the input/output functionality of your multimeter's PCA may be broken. You will need to replace the PCA.

The dial is not working

You try to turn the dial of the multimeter to turn it on, off, or change a measurement mode, but the dial is not changing the display, changes the display incorrectly, or is not working in some other way.

The dial is jammed

If the dial is not working, the dial is jammed and you will need to reinstall or replace it.

The dial is not changing display

If the dial is not working, the display may be broken. You will need to replace the LCD.

The input on the PCA is broken

If the dial is not working, the input/output functionality of the PCA may be broken. You will need to replace the PCA.

None of the above

None of the above categories matches your problem, or you tried one of the above fixes and it did not work.

There are a number of resources that you can still use to diagnose or fix your Fluke 77 Series III Multimeter. Consult the Fluke 77 Series III Multimeter Manufacturer Support Materials for more repair advice and guides on part replacement, testing, and cleaning. The Fluke 77 Series III Multimeter Instruction Sheet is another useful resource for understanding how to use the multimeter and fix its basic issues. If all else fails, you can find the Fluke 77 Series III Multimeter Manufacturer Device Page for more information and to contact Fluke Corporation.

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 - Réponse

I don’t like fluke 77 much. I like more Fluke 87 series especially Fluke 87V https://bestmultimeterreviews.org/fluke-... multimeter.

Gobri - Réponse

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 - Réponse

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 - Réponse

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 - Réponse

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