Programmable AC Source 6430/6420/6415 User‘s Manual
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4.7 Measurement
The measurement circuits on BM board monitor voltage, current, power, etc. Voltage and
current from the output are scaled down first, and then convert the RMS value to DC voltage.
The measurement of power is achieved by multiplying the scaled voltage and current with an
integrated multiplier of output DC voltage. All outputs of DC voltage are converted to digital
data, and sent to A board.
4.8 Sine Wave Generator
BS board is identified as the sine wave controller that generates sine waves, and acts as the
reference input of D/A stage. Over load protection, which limits the instantaneous output
current, is implemented here too.
4.9 Keyboard and Display
The keyboard is designated as K board, which is connected to D board through a short flat ribbon
cable. It contains 16 key switches and two LED indicators. The display is also connected to D
board through a short flat ribbon cable. It is comprised of three 4-digit, 7-segment LEDs. The
programming of V, F can be done by turning the rotary knob on the front panel too.
4.10 GPIB/RS-232C/External Reference
The remote control is done through the GPIB or RS-232C interface on the optional board, which
is connected to A board through the DIN connector. External reference is used to control the
amplitude of output AC voltage through DC reference.
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