PASCO PS-2157 Temperature Array - Manual (Page 4)

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T e m p e r a t u r e A r r a y S p e c i f i c a t i o n s
4
Two-point calibration
Though it is usually not necessary, a two-point calibration can be performed on a sin-
gle probe, or on all probes simultaneously, to make the measurements more accurate.
For step-by-step instructions refer to the documentation for DataStudio version 1.9.5,
the Xplorer, or the Xplorer GLX.
Oversampling
The degree of oversampling that takes place within the Temperature Array depends
on the sample rate and the number of connected probes. To maximize the oversam-
pling, set the sample rate as low as possible and disconnect any unused probes. In
many cases, increased oversampling reduces noise, produces smoother data, and
improves the measurement resolution. This effect is especially noticeable when very
small temperature changes are measured.
Measurement Repetition
At high sample rates, the Temperature Array may occasionally repeat a measured
value in order to maintain the flow of data without exceeding its processing capacity.
The maximum sample rate at which this does not occur depends on the number of
connected probes, as shown in the table (right).
At sample rates above these thresholds, you may notice that a rapidly changing tem-
perature graph has occasional plateaus where the sampled temperature remains con-
stant for two or more points in a row. To reduce the effect of measurement repetition,
use the smooth(n, x) function in DataStudio’s calculator. (For information about the
smooth function, open the Help menu in DataStudio and search for “smooth.”)
Specifications
Maximum Sample Rate
without
Measurement Repetition
Number of
Probes
Rate
(Hz)
1 200
2 or 3 100
4 to 8 50
Measurement Range -35 °C to 135 °C (probe dependent)
Maximum Range of Fast-response Probes
and Eight-probe Bundle -35 °C to 70 °C
Accuracy ±0.5 °C
Resolution 0.0025 °C
Repeatability 0.01 °C
Maximum Sample Rate 200 Hz per Temperature Sensor
Unit Options °C, °F, K