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When measuring S21 parameter the signal source will switch to the port 2, after
going through the DUT the signal input at port 1. The transition measurement is
based on the forward signal and the transition signal. KC901M cannot measure the
transition and reflection at the same time since the S21 measurement just supports a
simple calibration. Also the S21 measurement we call it "simple vector
measurement".
In audio source signal function, DDS is used for outputting the audio signal
directly. KC901M 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 of KC901M's batteries pack is 1A. The charging time
depends on the batteries capacity. Currently the existing battery with maximum
capacity in the market, has a single battery's capacity that can reach 3.4Ah. If
installing four batteries, the charging time will be 4/2×3.4≈7h. When a single battery
has been charged to 4.2V and the voltage of battery pack is 8.4V, the instrument will
stop the charging automatically. When the temperature is too low or too high,
instrument will also slow down the charging speed.
KC901M's endurance time is decided by the battery's capacity and its applying
function. Turning on mode S11 and mode S21 simultaneously, together with one or
more than one receivers, consumes more power than using any other functions.
Functions like frequency spectrum, field strength, signal source are most
power-saving, since they only need to start up signal source and one of the receivers.
When in STOP state, the whole RF circuit will be turned off. In this time, only the
processor and other display part are consuming the power.
When installing four batteries, the display screen's luminance is 20%. At the
same time, when the temperature is 15 ℃ , the endurance time 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 too high/low or the battery's
actual capacity is lower than stipulated.
Table 1
Function/Capacity
(S11)
RF
Transmission/Insertion Loss
Spectrum/Field Strength
RF Signal Source
Audio Signal Source
Endurance Time
2200mAh
2600mAh
3
4
3
4
5
6
5
6
6
8
- 36 -
3100mAh
3400mAh
5
5
5.
5
5
5.
7
8
7
8
10
12
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