Bill -
It's just a relatively safer way (low voltage) to measure current of a
high voltage supply. Any current that goes OUT of the supply on the
positive end MUST come IN via the negative end, or vice-versa depending
upon whether you learned your electronics in the military or civilian
schools!
Anyway, the resistor is near ground, (unless it opens!,) and so
connecting it to a panel meter is much safer than having the meter
connect across a shunt resistor somewhere up in the HV area of the supply.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Bill Dzurilla wrote:
Hi,
The B- of the power supply for the Drake L-4B and L-7 goes to pin 6 of the
Cinch connector. Inside the amp, the B- is floated above ground by a one ohm
resistor. The one ohm resistor that floats B- above ground is said to be for
the purpose of plate current metering. I do not quite understand how this
resistor is needed for plate current meter accuracy. Could someone please tell
me how that works?
I have an L-7 and a homebrew amp that uses a similar power supply. However, in
the homebrew amp the B- goes directly to ground. I'm trying to understand the
difference in the configurations.
Thanks and 73,
Bill NZ5N
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