Instrument Design and Functional Description R&S FSH
1145.5973.82 3.6 E-11
Detectors
The R&S FSH uses a detector for the positive peak and the negative peak value. In the “sample” mode
the measured value is routed directly to the display. In the RMS“ mode the detector determines the rms
value of the input signal for one specific point in the display during the measured time.
Keypad control
Keypad control is a dedicated function of the controller. For the implementation of the rotary knob, an
encoder is used that is detected with a dedicated CPLD (Complex Programmable Logic Device). This
“One Time Programmable” CPLD is programmed during production.
Serial optical interface
The interface to an external PC has been implemented with optical technology to avoid electrical loops.
The protocol is RS-232-based and is implemented in the instrument by the UART of the controller. It
requires a special optical RS-232 cable for communication (R&S FSH-Z34, delivered with the
instrument). The maximum baud rate is 115200.
Power sensor
The power sensor uses the display of the R&S FSH. Communication is achieved with a separate UART
from the controller.
Color LCD module
The ¼ VGA passive matrix display is backlighted by an FCC backlight, whose light output can be
adjusted to an optimum between visibility and battery use.
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