Campbell CR1000 User Manual

Section 8. Operation
Switch Closure on C Terminal:
12 Vdc Pull-Up
Open Collector on C Terminal:
12 Vdc pull-up
Internal CR1000 circuitry that supports open-collector
and switch-closure measurements (FYI)
• Pay attention to specifications. Take time to understand the signal to be
measured and compatible input terminals and CRBasic instructions. The
table Three Differing Specifications Between P and C Terminals
(p. 358)
compares specifications for pulse-input terminals to emphasize the need for
matching the proper device to the application.
Table 81. Three Specifications Differing Between P and C Terminals
P Terminal C Terminal
High-Frequency
Maximum
250 kHz 400 kHz
Input Voltage
Maximum
20 Vdc 16 Vdc
State Transition
Thresholds
Count upon transition from
<0.9 Vdc to >2.2 Vdc
Count upon transition from
<1.2 Vdc to >3.8 Vdc
358

Campbell CR1000 Specifications

General

Power Requirements	9.6 to 16 VDC
Data Logger Operating System	CRBasic
Memory	4 MB
Analog Inputs	16 single-ended or 8 differential
Analog Input Resolution	13 bits
Analog Input Range	+/-2.5V
Digital I/O	8
Pulse Counters	2
Communication Ports	RS-232
Operating Temperature	-25°C to +50°C
Pulse Channels	4