sr540 optical chopper 光学斩波器 4 hz to 3.7 khz chopping frequencies low phase jitter single and dual beam experiments sum & difference reference outputs bolt clamp or rod mounting sr540 optical chopper chop frequency 4 hz to 400 hz (5/6 slot blade) 400 hz to 3.7 khz (25/30 slot blade) frequency stability 250 ppm/°c (typ.) frequency drift <2 %, 100 hz < f < 3700 hz phase jitter (rms) 0.2° (50 hz to 400 hz) 0.5° (400 hz to 3.7 khz) frequency display 4-digit, 1 hz resolution and accuracy frequency control 10-turn pot with 3 ranges: 4 hz to 40 hz 40 hz to 400 hz 400 hz to 3.7 khz input control voltage 0 to 10 vdc for 0 to of full scale. control voltage overrides frequency dial. reference modes ?inner, ?outer, 5 × ?outer, ?inner + ?outer, ?outer - ?inner dimensions controller: 7.7" × 1.8" × 5.1" (whl) chopper head: 2.8" × 2.1" × 1.0" (whl) blade diameter 4.04" ±0.002" cable length 6 ft. power 12 w, 100/120/220/240 vac, 50/60 hz warranty one year parts and labor on defects in materials and workmanship, 90 days on motor. power 10 w, 100/120/220/240 vac, 50/60 hz warranty one year parts and labor on defects in materials and workmanship