B&K Precision 2658A - Manual - Manual (Page 38)

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By pushing , the detection mode is set.
POS SMPL NEG
POS (Positive Peak): The maximum value of the sample points is detected.
SMPL (Sample): The momentary value of the sample points is detected.
NEG (Negative Peak): The minimum value of the sample points is detected.
13.5 Setting of Trigger Source
By pushing , the trigger source is set.
INT EXT
INT: The sweep is automatically repeated. This setting is normally used.
EXT: When the signal over the trigger level (0.56 V) is input to external trigger input, the sweep
starts. The sweep automatically starts without an input. (Available only for zero span)
14. AUTO Tuning
When is pushed, the spectrum with the maximum level is searched within full span, and then
it is adjusted to the center of the screen, and the optimum setting parameters are set.
* Set the frequency span before setting AUTO tuning.
* There is no function menu displayed for this mode. Auto tuning will execute upon pushing the key.
* The auto tuning does not operate normally in the following conditions.
1) Zero span
2) Full span
3) The signal level is –40 dBm or lower.
4) The signal frequency is 50 MHz or lower.
15. Hold / Run
By pushing , the sweep is switched to halt and continuance.
* There is no function menu displayed for this mode.
F4
F5
AUTO TUNE
HOLD / RUN