The ALTEK Model C-41 Dry Contact Module is an optional accessory for use with Altek's 942 Frequency Calibrator, enabling precise dry-contact simulation and reading in timing and measurement workflows. It provides a robust dry-contact interface rated for up to 300V peak, 130 mA DC, and 400 mW, with two modes—simulate dry contacts and read dry contacts—and a frequency-indication LED that pulses in step with the signal; the device does not require calibration, though an annual performance check is recommended when used with the 942 calibrator. Manufactured by ALTEK INDUSTRIES CORP., Rochester, NY, the C-41 carries part number PN 1887857 Rev A (April 2002).
