Products > Test Equipment
Old Fluke Multimeters
bd139:
There are a few different LED display types in those. Some of the models had very early Monsanto dot matrix displays. Those buggers are (a) impossible to get and (b) totally unreliable. The later LED models are fine as long as they haven't been dropped. The mounting peg system was stupid. You can spot a dropped one a mile off up front by shaking it :)
Past LEDs, the main failure modes I have seen are dicky switches, reed relays packing in, power supply pass transistors with degraded beta, knackered electrolytics, entirely duff ASICs.
Martin.M:
8300A: function display assy.
GregDunn:
--- Quote from: bd139 on October 17, 2018, 08:27:05 am ---There are a few different LED display types in those. Some of the models had very early Monsanto dot matrix displays. Those buggers are (a) impossible to get and (b) totally unreliable. The later LED models are fine as long as they haven't been dropped. The mounting peg system was stupid. You can spot a dropped one a mile off up front by shaking it :)
Past LEDs, the main failure modes I have seen are dicky switches, reed relays packing in, power supply pass transistors with degraded beta, knackered electrolytics, entirely duff ASICs.
--- End quote ---
Thankfully, mine look like standard MANxx segment displays; and when I had the meters open to replace caps, one of the things I did was check the seating of the display assemblies in their sockets. A few of the main board ICs were a little loose initially but it didn't seem to have any effect on the meters. I remember early computers which, after multiple on/off heat cycles, would lever the ICs out of their sockets and cause flakeys. Hasn't happened to my meters yet.
I know they're not sexy like the VFDs or OLEDs, but I'll take LEDs or TN LCDs over anything else in a device I use as a tool every day.
bd139:
Yes agree with the displays. The LCD 8010 was a big regression unfortunately if you ask me. I had one a while back and did actually consider backlighting it.
Martin.M:
the 883A Differential Voltmeter :)
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