Campbell Scientific CR1000KD CR800 and CR850 Measurement and Control Systems - Page 299
Pulse-Input Channels P1 - P2
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Section 8. Operation Table 64. Pulse-Input Channels and Measurements Pulse-Input Channel Input Type Data Option P1, P2 • High-frequency • Counts • Low-level ac • Frequency • Switch-closure • Run average of frequency • Counts • High-frequency • Frequency • Switch-closure C1, C2, C3, C4, C5, C6, C7, C8 • Low-level ac (with LLAC4 Low-Level AC Conversion Module) • Running average of frequency • Interval • Period • State CRBasic Instruction PulseCount() PulseCount() TimerIO() 8.1.5.1 Pulse-Input Channels (P1 - P2) Read More! Review pulse counter specifications at CR800 Specifications. Review pulse counter programming in CRBasic Editor Help for the PulseCount() instruction. Dedicated pulse-input channels (P1 through P2), as shown in figure Pulse-Input Channels (p. 300), can be configured to read high-frequency pulses, low-level ac signals, or switch closures. Note Input-channel expansion devices for all input types are available from Campbell Scientific. Refer to Sensors and Peripherals for more information. Caution Maximum input voltage on pulse channels P1 through P2 is ±20 V. If pulse inputs of higher than ±20 V need to be measured, third-party external-signal conditioners should be employed. Contact a Campbell Scientific applications engineer if assistance is needed. Under no circumstances should voltages greater than ±50 V be measured. 299
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