When executing a trace data transfer from the 2650 or 2658 to a PC, the spectrum analyzer will return the trace data in hexadecimal format. In order to read the data values, these data points will need to be converted using the following equation.

'

**Ref level**' - [(200 - '

**HEX data converted to decimal**') x '

**resolution**'] = '

**data value**'

Resolution value is derived from the scale setting:

10 dB/div: 0.4 dB

5 dB/div: 0.2 dB

2 dB/div: 0.08 dB

*Example:*

*Returned HEX data point = 2A*

*Reference level of trace is set to 110 dBuV*

*Scale setting of trace = 10 dB/div*

*HEX data converted to decimal, 0x2A = 42 (dec)*

*Scale setting = 10 dB/div, so resolution is 0.4.*

*Enter values into equation:*

*110 - [(200 - 42) x 0.4] = 46.8*

*So for a HEX return data of 2A, the data point value is 46.8 dBuV.*

To calculate associated frequency values for return trace data, divide span by number of points.