The US Congress says it wants Nielsen Research to delay full implementation of its new electronic TV ratings meters. “Nielsen, which has a monopoly on counting TV viewers, is switching to an electronic system for measuring local habits that it contends will be far more accurate. Currently, 500 households in a city are asked to record their TV viewing in a diary kept during four “sweeps” months. Nielsen is increasing its sample to 800 homes per city and measuring viewing every day through a “people meter” device attached to televisions. Some critics say dry runs of the new system have shown sharply lower ratings for some programs popular in black and Latino homes.”