| Products > Test Equipment |
| Fluke 8600A Battery / Power Supply Conversion |
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| PlaneSailing:
Yes, aware the 2 versions (battery or line only) of the 8600A use different transformers. If someone with either version and an IR thermometer can measure the hottest spot on the top of the case 30 minutes after power on, at normal room temp, would be grateful. Then I can tell if my observed 120 degF after converting a battery version to line operation is "normal", or something I have to work on, thanks. |
| Jeff eelcr:
I have the line version not an -01 option I can check tuesday next day at work If no one else does it first. Jeff |
| BobRyan:
I have the line-powered version as well. I've left it on ACV/AUTO for the last hour and the hottest spot I can find is 100.5*F (rear and just left of IEC-C14 input while viewing the display). That said, I still wouldn't worry much about 120*F. |
| edavid:
I checked a couple of line units, and they both reached 105F over the transformer. Ambient temp was 60F. |
| PlaneSailing:
My thanks to BobRyan and edavid for measuring 100 to 105 degF case temperature over the line transformer on their 8600As. After my battery option to line power conversion I measure 120 degF outside case temp over the transformer. Took off the case, and the transformer itself is the same 120 deg. after 30 minutes. I am worried about the plastic case coloring/melting, and wonder if there is anything I can do to draw less line current and thus run the transformer "cooler" ?. Measure 8.2V DC after the rectifying diodes and CR27 7.5V zener controlling the Q43 triac, presumably they are included in the original battery powered circuit to hold the voltage at 8.2 so as to not damage the nicads ?. Thus the triac/zener is "shorting" the transformer secondary voltage above 8.2V both cycles of the rectified AC. As I have removed the nicads, maybe removing the triac and zener also would help reduce line current ?. An alternate idea is to improve the cooling by drilling holes in the back of the case either side of the power socket, but don't think it would help, as measure the same 120 degF with no case...... But then could install a small 40mm 5V fan to force air in one side, around the transformer and out the other side. Getting far away from the original design, but the inside is already "hacked up". Appreciate any advice, thanks. [Side note: Meter was reading DCV, DC current and resistances 1% low (did not try ACV or ACI) that could not be calibrated out. So I soldered a 470 Ohm resistor in the A/D reference chain (in series with R60) to lower the 1V/0.1V reference - a calibration, and the readings are now where they should be. A great little meter.] |
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