HP 3457A Service Manual page 170

stimulus during the multimeter Self Test routine.
8-14, AC to DC Converter
The AC to DC Converter is a computing true rms converter which converts AC input signals up to 10
volts full scale and between 20 Hz and | MHz to an equivalent DC voltage for measurement by the
HP 3457A.
8-15. Analog to Digital (A/D) Converter
The Analog to Digital Converter uses a multi-slope conversion process to convert the analog measure-
ment data to digital information.
8-16. Voltage Reference
The Voltage Reference circuit, as the name implies, provides a stable voltage to the Analog to Digital
Converter and the Ohms Current Source for measurement reference.
8-17. A/D Controller
The A/D Controller controls the measurement process, Function and range information received from
the Main Controller is used to control the input switching and A/D converter. Measurement values are
computed by the A/D Controller and then transmitted to the Main Controller through the isolation
logic circuitry.
HP 3457A Multimeter
8-4