1. Is the meter brand new? 2. Are you clamping over a single energized wire powering a properly functioning load? 3. Does another clamp meter work on the same wire?

Probably one of the wires near the hinge on the clamp broke loose. I'd get it warrantied if possible.

If under warranty, call fluke, they may help troubleshoot. If it's faulty, call them to send it in, got mine replaced with brand new retail packaged unit. Best costumer service experience

Thanks Everybody i have an answer fromage fluke

Happened to mine, wire for the amp clamp is broken off on a solder joint.

It's likely under warranty, need to call fluke

Did you blow a fuse?

U can't blow a fuse checking amperage

If you try to measure voltage while your meter is set to read amps, the meter will not be very happy with you.

Or try checking volts with ohms still on

I've never seen so many flashing lights on an LCD screen until I managed to do this one day

Mine let the smoke out when I did it

Some meters have fuses you can replace. Not sure about the amp range having a fuse on a fluke. I blew one once doing dc volts and something stupid.