Ceyear 4051 Series, Руководство пользователя

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8. Specifications and test methods
8.5 Performance characteristics test
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Note: The synthesized signal generator and the function generator can be replaced with the synthesized signal
generator with built-in AM option.
b) Test equipment
E8257D is recommended for the synthesized signal generator.
Function generator
c) Test steps
1) Connect the test equipment as shown in Fig.8 4, reset 4051, and connect the output of the signal generator
to the input of the tested 4051, and the 10MHz output interface of 4051 to the 10MHz INPUT port of the
synthesized signal generator.
2) Set the output frequency of the signal generator as 1GHz, the output amplitude as -5dBm, the modulation
mode as ―Internal AM‖, the modulation depth as 80% and the modulation wave as the triangular wave
output.
3) Set the 4051 analyzer center frequency as 1 GHz, the frequency span as 100 MHz, the minimum settable
sweep time as 1 ms and the maximum settable sweep time as 6,000 s. If above settings meet records in the
4051 Record Sheet, they will be considered as compliant, otherwise not.
4) Set the 4051 analyzer frequency span as 0 Hz and the range of sweep time as 1 μs to 6,000 s.
If above settings meet records in the 4051 Record Sheet, they will be considered as compliant, otherwise not.
5) Set the 4051 analyzer with linear scale, Peak detection mode and the resolution bandwidth as 3 MHz.
6) Set the sweep time of 4051 and the AM frequency of the signal generator according to the test items listed
in the 4051 Auxiliary Form.
7) Execute Single Sweep, read the time difference ΔT between the 2nd and 10th peak value from the left
with the Marker Delta and record it in B5 of the 4051 Auxiliary Form.
8) Set different sweep time according to requirements in B5 of the 4051 Auxiliary Form and repeat step 6 to
7.
9) The 4051 analyzer has seven trigger modes, including free, video, power, external level (front panel),
external level (rear panel), burst RF and timer. When set as free trigger, the spectrum trace can be
refreshed normally.
10) Set the output frequency of the signal generator as 2 GHz, the output power as -20 dBm, the pulse
modulation output width as 1 ms and the pulse period as 2 ms; connect the RF output interface to the RF
input interface of the 4051 analyzer; set the 4051 analyzer frequency as 2 GHz and the trigger mode as
video trigger; reduce the trigger level. If the signal spectrum trace can be refreshed, then the 4051 video
trigger mode meets relevant technical requirements, otherwise not.
11) Set the output frequency of the signal generator as 2 GHz, the output power as -20 dBm, the pulse
modulation output width as 0.1 ms and the pulse period as 0.2 ms; connect the RF output interface to the
RF input interface of the 4051 analyzer; set the signal generator as low frequency output, the output
frequency as 1 kHz and the output voltage as 1 V; connect the lower frequency output interface to the
trigger input interface of the 4051; set the 4051 analyzer frequency as 2 GHz and the trigger mode as
external trigger; reduce the trigger level. If the signal spectrum trace can be refreshed, then the 4051
external trigger mode meets relevant technical requirements, otherwise not.
12) Trigger delay of 0 ~ +500 ms and trigger delay resolution of 0.1 μs are guaranteed by the design.
13) If steps 9 to 12 are completed, then the trigger mode of the 4051 analyzer meets relevant technical
requirements and ―Compliant‖ should be noted in relevant items in the 4051 Record Sheet. Otherwise, it
will be considered as noncompliant.
d) Test records and data processing
14) Calculate the sweep time accuracy δ with the formula (11).