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transmission measurement comes from comparing the forward signal with the
transmission signal. In theory, if all errors of the transmission measurement need to
be removed, The RF parameters of DUT's two ports need to be known.
When KC901V is doing the transmission measurement, it's not able to get the RF
parameter of the same direction. So it can't remove all errors conveniently (unless
turn the device into another direction and test it again, but it would be so complicat-
ed to do it.). Consider that other errors are small, so it won't be a main problem to
engineering application. Therefore, S21 only support simple calibration. Accordingly,
KC901V's S32 measurement is called "Simple vector measurement".
In audio source signal function, DDS is used for outputting the audio signal di-
rectly. KC901V uses the digital synthesizer which the clock frequency is 400MHz.
Therefore the audio signal source function can produce signal which the frequency is
over 50MHz. Also it supports FM, but the index is not guaranteed.
6.2 Charging Time and Endurance Time
The Rated charge current KC901V's batteries pack is 1A. The charging time is re-
lated with batteries capacity. Currently the commercial battery which has the maxi-
mum capacity, its single battery's capacity can reach 3.4Ah. If there are four batteries
installed in it, the charging time will be 4/2×3.4≈7h. When single battery has been
charged to 4.2V and the voltage of battery pack is 8.4V, instrument will stop the
charging automatically. When the temperature is over low or over high, instrument
will also slow down the charging speed.
KC901V's endurance time is depended on battery's capacity and its applying
function. The power which is run out by different functions of KC901V is different. In
S11, S21 function, it needs to start up the signal source as well as one or more than
one receivers at the same time. Therefore its power consumption is the maximal. In
spectrum, field strength, signal source and other functions, since they only need to
start up signal source and one of the receivers, so in these functions, more power can
be saved. When in STOP state, the whole RF circuit will be turned off. In this time, on-
ly the processor and other display part are using the power.
When installing four batteries, display screen's luminance is 20%. At the same
time, when the temperature is 15 ℃, the endurance times of different functions are
shown in following table (Table 1). This table is only for reference. The endurance
time will be less when the temperature is over high/low or battery's actual capacity is
not enough.
Table 1
Function/Capacity
reflective(S11)
Transmission/Insertion Loss
Endurance Time
2200mAh
2600mAh
2.5
3.5
2.5
3.5
- 35 -
3100mAh
3400mAh
4.5
5
4.5
5
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