Panel Meter, Tachometer, Frequency Input, 0.001Hz-50kHz, 2-Chan, 15VAC/VDC
选件卡，输入 -
得捷:
DC TACH/FREQ MODULE UDM/USC
Allied Electronics:
Panel Meter, Tachometer, Frequency Input, 0.001 Hz-50 KHz, 2-Chan, 15 VAC/VDC
Newark:
# CARLO GAVAZZI BQTF1 Input Card, Tachometer/Frequency, DC
MASTER:
DC TACHO/FREQUENCY INPUT MODUL