Fluke PM3370B user manual Example

6 - 24 THE CPL PROTOCOL

sample 2 bytes (Most Significant Byte + Least Significant Byte), representing the 16 bit sample value (bit 16 = -32768, bit 15 = 16384, ..., bit 1 = 1). Range: -32k (down) to +32k (up)

Example: 1000000011000111 = value -32569 byte 1 byte 2

byte 1 = 128 (value -32768)

byte 2 = 128+64+4+2+1 = 199 (value +199)

checksum 1 byte checksum of all sample bytes (add one by one; result modulus 256)

Example:

In this example, a waveform of 512 points is generated in the computer and sent to the oscilloscope. The display of the waveform on the oscilloscope screen consists of two sine waves (amplitude = ± 3 vertical divisions and period (2π) = 5 horizontal divisions). The Y-scale will be set at 500 Volts per division, and the X-scale at

50.0 μs per division. The following values can be calculated from these settings:

-The number of waveform amplitude points = 3 divisions * 6400 points/div. = 19200 (used in the example program)

-The number of waveform time points = trace length (512) / 2 * 2π) = 40.744 (used in the example program)

500 V/div.

- <Y_resolution> == 78.13E-3V 6400 dots/div.

50 μ/div.

- <X_resolution> == 1E-6s 50 dots/div.

After running the example program, perform the following:

„Select the default setup by pressing the front panel keys STATUS and TEXT OFF at the same time.

„Select the digital mode by pressing the ANALOG key.

„Select the recall menu by pressing the RECALL key.

Use the TRACK button and the software keys to turn the m4 register display on and the acq display off.

„Press the STATUS key.