CAMET CAA-500 Manual de instrucciones - Página 3

Navegue en línea o descargue pdf Manual de instrucciones para Instrumentos de medida CAMET CAA-500. CAMET CAA-500 4 páginas. Standing wave analyzer

◆ How to use

▼ Preparation

Operation check before using CAA-500.

1. Connect a 50Ω dummy load to the Output Connector (*50Ω dummy load is not included).

2. After turning on the POWER switch, numbers will appear on the display. These numbers indicate the

software version. When using AA batteries, be sure that the decimal point on the Frequency Counter does

not blink. Change all batteries if it blinks.

3. The display should indicate 1.1 or less SWR, and 50Ω impedance.

4. The CAA-500 is ready to use if the above values are displayed.

▼ SWR Measurement

● Connect the antenna to the CAA-500 output connector, directly or with the shortest coaxial cable

possible. Long cables may modify the displayed impedance and SWR.

● Set the Frequency Range Selector to the proper frequency range. Adjust the FREQ knob to the desired

frequency.

● The SWR at the selected frequency will be indicated in the SWR scale on the display.

▼ Impedance Measurement

■ Connect the antenna to the CAA-500 output connector, directly or with the shortest coaxial cable

possible. Long cables may modify the displayed impedance and SWR.

■ Set the Frequency Range Selector to the proper frequency range. Adjust the FREQ knob to the desired

frequency.

■ The impedance at the selected frequency will be indicated in the OHMS scale on the display.

▼ Antenna Resonance Frequency Measurement

★ Connect the antenna to the CAA-500 output connector, directly or with the shortest coaxial cable

possible. Long cables may modify the displayed impedance and SWR.

★ Select the frequency range with Frequency Range Selector. Adjust the FREQ knob to the desired

frequency.

★ The point where the lowest SWR is indicated is the resonant frequency.

FAQ －

－

Q. When connecting the antenna to CAA-500 directly, the resonant frequency does not match,

or SWR is high.

A. In some situations of insufficient grounding, particularly when using a vertical antenna without ground radials,

erroneous readings may occur, frequently due to common-mode current flowing on the shield of the coaxial

cable. Such a condition results in unsatisfactory antenna performance anyway, so take the appropriate steps to

resolve the current profile issues in your antenna system.

Q. The displayed impedance is 50 Ohms, but SWR shows a high value.

A. The impedance shown in the meter is the absolute value including the reactance. When the impedance is 50

Ohms on this analyzer, the SWR may not be 1.0. In other words, 1:1 SWR is an ideal condition when the

impedance is 50 Ohms, and the SWR is not high because the reactance is almost zero.