CSC Product Information

Product Information - QD1

1-Channel Incremental Shaft Encoder Interface

General Description

The QD1 is designed as a general purpose quadrature decoder to interface Campbell Scientific's CR10, 21X, and CR7 dataloggers to incremental encoders.

As the encoder rotates, it produces two square waves which are 90° out of phase with each other. When the rotation is reversed, the relation of the two square waves is reversed. The QD1 decodes the two square waves and gates a voltage pulse to a datalogger pulse counting channel. Two pulse counting channels are required, one for each direction of encoder rotation.

Specifications

Datalogger Compatibility:	CR10, 21X, CR7
Power Supply:	4 to 5.6 V
Current Drain:	0.2 to 0.4 mA avg.
Operating Temperature:	-25° to +50°C
Humidity:	0 to 95%, noncondensing
Minimum Time Between Input Transitions:	0.75 ms***
Output Pulse Width:	0.25 ms @ 25°C
Signal Magnitude, Volts:	0 (low), supply voltage (high)
Dimensions:	2.9 x 1.7 x 0.85 in
Weight:	0.22 lbs

***Note: The minimum time between input transitions implies a rate of 1333.3 counts/sec. To realize this specification, the time between transitions must be evenly spaced; a function of the encoder.

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