B&K Precision 2658A - Manual - Manual (Page 15)

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The center frequency is set with this key. The setting range is 0 to 3.3 GHz (for 2650A, 2652A, and 2651), and
0 to 8.5 GHz (for 2658A). The setting resolution is 20 kHz.
4) Frequency span key
The frequency span is set with this key.
For 2650A, 2652A, and 2651, it is set in the range from 200 kHz to 2 GHz, ZERO SPAN or FULL SPAN (3.3
GHz). For 2658A, it is set in the range from 200 kHz to 5 GHz, ZERO SPAN or FULL SPAN (8.5 GHz).
5) Reference level key
The reference level is set with this key. It can be set in the range from +10 dBm to –60 dBm by 1 dB step.
6) Resolution bandwidth key
The resolution bandwidth is set with this key. It can be set in the range from 3 kHz to 3 MHz and to AUTO.
7) Video bandwidth key
The video bandwidth is set with this key. It can be set in the range from 100 Hz to 1 MHz and to AUTO.
8) AUTO tuning key
When pushing this key, the spectrum with the maximum level is searched within full span (3.3 GHz @
2650A/2652A/2651 and 8.5 GHz @ 2658A), and then it is adjusted to the center of the screen, and the
optimum setting parameters are set. In the case when in zero span, full span, input signal level lower than –40
dBm and input frequency lower than 50 MHz, this function will not work correctly.
9) Measuring function key
Available for Channel power, Adjacent channel leakage power, Occupied frequency bandwidth, Electric field
strength, and Magnetic field strength measurement.
10) Calculation function key
Available for Max hold, Min hold, Average and Over write.
11) Display scale key
The display scale of amplitude axis can be selected as 2 dB/div, 5 dB/div or 10 dB/div with this key.
12) Sweep key
The sweep time can be set in the range from 10 ms to 30 s or AUTO. This key can also select the detection
mode.
13) Hold/Run key
Used to hold or run measurements.