... of EAS: displaying 1000±50KHz. If no EAS tester, use oscillograph for adjustment, firstly disconnects the P5 terminal antenna on transmitter ... , set the JP1 on 1&2. Connect the probe of oscillograph to the transmitter TP4, earth to TP2, adjust the potentiometer ... relates to the testing gate distance. Connect the probe of oscillograph to TP7, earth to TP8. Adjust R23 can change the ...