22
5.
Press FUNCTION key to exit.
2.3.1 Alarm
The default setting is “OFF”, which means no alarm.
When “ON” is selected, and the sorting result is “P1” or “PASS”, the beeper
alarms.
Only if the sorting parameter is correctly set to get correct sorting result signal,
correct alarm signal can be obtained.
2.3.2 Trigger (continuous/single)
The default setting is “OFF”, which means continuous measurement. In this
mode, the instrument continuously measures and calculates display value. And
after one measurement, another measurement immediately starts.
If “ON” is selected, which means single measurement, the instrument doesn’t
start one measurement until getting ‘START” signal. The signal can be obtained
through either START key on front panel or HANDLER interface, RS-232C
interface.
2.3.3 Equivalent model
The default model is serial connection (“SEr”).
The real-world capacitor, resistor and inductor are not ideal, but component of
complex impedance in the form of serial connection or parallel connection. The
instrument calculates necessary values according to equivalent circuit
connected in series or parallel. And different result will be obtained in different
circuits, differing in different components.
The following description gives some practical guide lines for selecting the
equivalent circuits:
1. Real-world equivalent circuit can be selected following the manufacturer’s
recommendation. If there is no recommendation to be followed, we select the
circuit mode according to the variation of D under two different frequencies. If
the dissipation factor of a capacitor increases with the increase of the test
frequency, series circuit mode will be selected. In formulas in following table, D
in series connection is in direct ratio with frequency. If the dissipation factor
decreases with the increase of the test frequency, parallel circuit should be used,
and D in parallel connection is in inverse ratio with frequency. For inductor, the
situation is just in the opposite side.
2. Judge according to the actual application in circuits. If a capacitor is used as
a coupling capacitor, series circuit mode is the best choice; if a capacitor is used
in a LC oscillator then parallel circuit model can be selected.
3. Select the equivalent circuits according to the following rules:
Component with low impedance (such as large capacitor and small inductor) is
usually measured in series circuit mode;
Component with high impedance (such as small capacitor and large inductor) is