Spectrum Controls 140 ACI 052 00sc - Manual (Page 15)

Once at power up only
Every 1 min
Every 10 min [default]
Every 30 min
Selecting an autocalibration schedule rate is an exercise in tradeoffs.
Performing autocalibration more frequently may result in greater
accuracy due to variations caused by environmental factors such as
temperature. This accuracy has a cost in the burden imposed by
performing the calibration. The calibration time is a function of the
filter frequency. Calibration times are listed below. The system
cannot update the channel data while performing calibration. In
addition, if multiple filter frequencies are selected, calibrations for
each frequency and the execution time is cumulative. The worst
case calibration time is when all filter frequencies are enabled (10,
50, 60 and 1000 Hz). The time is then the total for all four times
listed below. Also, note that the channel enables have no effect on
the auto calibration feature. If a filter frequency is enabled via the
zoom screens, then the autocalibration is performed for the frequency.
10 Hz 1,420 msec
50 Hz 397 msec
60 Hz 260 msec
1000 Hz 45 msec
❑ Filter Frequency Selection: The Analog-to-Digital Conversion
performs a filter function on the input signal. One of the following
filter frequencies may be selected for each of the four groups of
eight channels:
Filter: 10 Hz
50 Hz
60 Hz [default]
1000 Hz
❑ Input data format: One of the following data formats may be selected
for each of the four groups of eight channels:
Format: 16-bit Format
Voltmeter [default]
12-bit Format
15-bit plus sign Format
9
Installation Instructions
32-Channel Analog Input Module
Quantum Series 140 ACI 052 00sc