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RMS-to-DC converters Chassis
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This chassis contains two "RMS-to-DC converters" boards.
Basically, this device is composed of:
- a filter
- an amplifier
- the rms-to-dc chip itself.
The 1MHz signal is put in the filter which eliminates the noise, then
amplified and picked up to be sent to the digital multimeter as a
digital output.
After the amplifier, the rms-to-dc converter transforms the signal into an
analog signal (dc) proportionnal to the current. This is the second output.
The noise can basically come from two main sources:
- 60Hz waves radiated from power lines
- noise coming from ground loops
To avoid the first, the rms-to-dc boards are covered by a special aluminum box
(like a Faraday Cup); to avoid the second, we decided to separate the grounds
of the power supplies, the chassis, and the grounds of the boards by using
ceramic stand-offs.
On the front panel, the connectors for the intermediate frequency (1MHz) inputs
& outputs are triaxial bulkheads. The two connectors for the analog outputs are
insulated BNC bulkheads.
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Last update: July 25th 1997
