sca_lower_threshold_prop.set_description("defines the lower voltage threshold which generates TTL pulses.\nCommonly an SCA is operated by setting an upper and lower\nlevels. it is adjustable between 50 mV to 10 V,\nprecision +/- 10 mV.");
sca_upper_threshold_prop.set_description("defines the upper voltage threshold which generates output\nTTL pulses. Commonly an SCA is operated by setting an upper and lower\nlevels. it is adjustable between 50 mV to 10 V,\nprecision +/- 10 mV.");