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Agilent 34401A Front Panel Hacking

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Kleinstein:
The VFD filament resistance very likely changes with temperature. So if the 10 ohm are measured with a normal DMM and cold, the resitance in normal operation can be quite a bit higher, like 3 x that.

qu1ck:
In my design I provided a contact point to solder external 12v for the display but ended up not using it. So 100mA is with the boost converter, if you provide Vcc directly it will be much lower.
Datasheet max figures are for all pixels lit, in reality when displaying some text you have ~20% lit. I wouldn't worry about it too much. Measure the power consumption of native front panel for reference, I doubt it will be lower than a redesign with modern micro + oled.

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