Products > Test Equipment
Old Fluke Multimeters
IconicPCB:
Gearhead thanks for Your consideration.
I have a NOS 8050 bought on ebay with 120V transformer.
Am looking for a 240V transformer to replace the 120V option. I understand the transformers are like hens teeth.
If the transformer based powersupply were to be replaced by a battery pack what would be the appropriate voltages coming from the battery pack.
I can not measure the rails in the 8050, no way to power it up at the moment.
edavid:
--- Quote from: IconicPCB on December 27, 2015, 10:30:50 pm ---If the transformer based powersupply were to be replaced by a battery pack what would be the appropriate voltages coming from the battery pack.
--- End quote ---
5V, but why not just buy a small transformer?
http://www.ebay.com/itm/Hot-220V-240V-to-110V-120V-Step-Down-Voltage-Converter-50W-Transformer-Adapter-/351444718689
IconicPCB:
VotlageS..plural.
The meter operates on a few rails... so what would they be?+/-15?+5?
wiss:
--- Quote from: edavid on December 28, 2015, 12:22:44 am ---
--- Quote from: IconicPCB on December 27, 2015, 10:30:50 pm ---If the transformer based powersupply were to be replaced by a battery pack what would be the appropriate voltages coming from the battery pack.
--- End quote ---
5V, but why not just buy a small transformer?
--- End quote ---
How about hacking in a USB PowerPack? and a 5V regulator for charging?
ModemHead:
--- Quote from: IconicPCB on December 28, 2015, 12:57:04 pm ---The meter operates on a few rails... so what would they be?+/-15?+5?
--- End quote ---
I assume you have a line-powered model. The battery-powered model (-01 option) has a multi-tapped transformer and runs from a 4.8V NiCd pack via a DC-DC converter.
According to the text of the instruction manual, the transformer has to be replaced in the line-powered model. Oddly, the schematic shows a multi-tapped transformer, but I checked a 120V unit that I have here and the 100V and 240V pins are indeed no-connect.
I measured this unit and marked the readings on the attached schematic section. All readings are relative to ground (TP1). It looks like a small 24VCT transformer would be a reasonable substitute. For a direct DC supply, I would guess that anything from a +/-12V to +/-15V would probably work OK, since those rails are unregulated and seem to vary widely. The positive rail load averages 23mA, the negative rail load averages 60mA. The assymetric load is probably due to powering the CMOS logic between -5V and ground.
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