Campbell Scientific CR3000 CR3000 Micrologger - Page 299
Time Skew Between Measurements
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Section 8. Operation Table 62. Calibrate() Instruction Results Array Cal() Element 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 Differential (Diff) Single-Ended (SE) SE Diff SE Diff SE Diff SE Diff SE Diff SE Diff SE Diff Descriptions of Array Elements Offset or Gain ±mV Input Range Gain 200 Offset 50 Offset 50 Gain 50 Offset 20 Offset 20 Gain 20 Offset 5000 Offset 5000 Gain 5000 Offset 1000 Offset 1000 Gain 1000 Offset 200 Offset 200 Gain 200 Offset 50 Offset 50 Gain 50 Offset 20 Offset 20 Gain 20 Integration 60-Hz Rejection 60-Hz Rejection 60-Hz Rejection 60-Hz Rejection 60-Hz Rejection 60-Hz Rejection 60-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection 50-Hz Rejection Typical Value -0.00667 mV/LSB ±30 LSB ±30 LSB -0.00167 mV/LSB ±35 LSB ±35 LSB -0.00067 mV/LSB ±25 LSB ±25 LSB -0.167 mV/LSB ±25 LSB ±25 LSB -0.0333 mV/LSB ±30 LSB ±30 LSB -0.00667 mV/LSB ±30 LSB ±30 LSB -0.00167 mV/LSB ±35 LSB ±35 LSB -0.00067 mV/LSB 8.1.2.10 Time Skew Between Measurements Time skew between consecutive voltage measurements is a function of settling and integration times, A/D conversion, and the number entered into the Reps parameter of the VoltDiff() or VoltSE() instruction. A close approximation is: Time Skew = Settling Time + Integration Time + A‐D Conversion Time1 + Reps/NoReps2 1A/D (analog-to-digital) conversion time = 125 µs 2Reps/No Reps -- If Reps > 1 (i.e., multiple measurements by a single instruction), no additional time is required. If Reps = 1 in consecutive voltage instructions, add 15 µs per instruction. 299
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