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I have a nice HP 437B Power Meter that is not working. It passes self
test OK, But the output from the Sensor (Good 8482A) displayed varies
all over the place. Even after zero preformed on Power meter. I
downloaded the Service manual from the Agilent web site. The manual is
missing what is called the service sheets. BD1 Block Diagrams and the
schematic sheets A3A,A3B,A3C,A4A,A4B,A4C. Anyone have these sheets in
PDF format.

I suspect a problem with the Analog board but would like more info
before I start poking around.

Thanks
Rich KQ6EF

Do you have the sensor connected to a 50 ohm source (turned off) or pad?
Sometimes an open sensor input can make things jump around especially on
low ranges.

Best,
-John



Richard wrote:

First off , are you sure that your 8482A is ok ? have you verified operation with another powermeter ? one offender on the 437 as well as other meters is the input connector, if the contacts wear out over time you get problems

Richard <kq6ef@...> wrote: I have a nice HP 437B Power Meter that is not working. It passes self
test OK, But the output from the Sensor (Good 8482A) displayed varies
all over the place. Even after zero preformed on Power meter. I
downloaded the Service manual from the Agilent web site. The manual is
missing what is called the service sheets. BD1 Block Diagrams and the
schematic sheets A3A,A3B,A3C,A4A,A4B,A4C. Anyone have these sheets in
PDF format.

I suspect a problem with the Analog board but would like more info
before I start poking around.

Thanks
Rich KQ6EF






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