B&K Precision 2658A - Manual - Manual (Page 86)

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27.4 Display Accuracy of Frequency Span
Adjust the frequency of the calibration equipment so that the peaks are at the positions of f
1
and f
9
, and
measure the frequencies of f
1
and f
9
. Calculate from f
1
and f
9
the display accuracy of the frequency span.
*1 2650A/2652A/2651 only *2 2658A only
· Setting of 2650A/2652A/2651/2658A · Setting of calibration unit
Reference level : -15 dBm Frequency : Adjust it to the positions of f
1
VBW : AUTO and f
9
.
Sweep time : 1 s Output power : -15 dBm
Detection mode : SMPL
Display scale : 10 dB/div
27.5 Linearity of Amplitude Axis
Adjust the level of the calibration unit so that the peak is at the top of the amplitude axis (0th div), and regard the
point set at that time as the reference. Gradually lower the output, starting from the reference, and measure the
amplitude value of 2650A/2652A/2651/2658A.
Setting of
2650A/2652A/2651/2658A Output of calibration unit Specifications
Measurement
value
Judgment
Display scales
10 dB/div
XdBm (adjust it to the 0th div)
Reference(-15 dBm)
X-10 dBm Within -25 dBm±0.8 dB±1dot
5 dB/div
XdBm (adjust it to the 0th div) Reference(-15 dBm)
X-5 dBm Within -20 dBm±0.4 dB±1dot
2 dB/div
XdBm (adjust it to the 0th div) Reference(-15 dBm)
X-2 dB Within -17 dBm±0.2 dB±1dot
·Setting of 2650A/2652A/2651/2658A · Setting of calibration unit
Setting of 2650A/2652A/2651/2658A
Specifications
f
1
Measurement
value
f
9
Measurement
value
(f
9
- f
1
) Judgment
Frequency span
Center
Frequency
RBW
200 kHz 100 MHz 3 kHz within ±180 kHz ×3%±1dot
10 MHz 100 MHz 100 kHz within ±8 MHz ×3%±1dot
20 MHz 100 MHz 300 kHz within ±18 MHz ×3%±1dot
200 MHz 100 MHz 3 MHz within ±180 MHz ×3%±1dot
500 MHz 1 GHz 3 MHz within ±400 MHz ×3%±1dot
2 GHz 1 GHz 3 MHz within ±1.8 GHz ×3%±1dot
FULL(3.3 GHz)*1 1.65 GHz 3 MHz within ±2.64GHz ×3%±1dot
2 GHz *2 4.8 GHz 3 MHz within ±1.8 GHz ×3%±1dot
2 GHz *2 7.4 GHz 3 MHz within ±1.8 GHz ×3%±1dot
FULL(8.5 GHz)*2 4.25 GHz 3 MHz within ±7.65 GHz ×3%±1dot
* f
1
: 1 st div from the left on the spectrum display f
9
: 9 th div from the left on the spectrum display