Measurement Computing TempScan/1100 - Manual (Page 177)

Software Reference 988992 ChartView , CV-45
Question 2: How do I measure a 60 cycle waveform using just one channel?
Answer: To measure AC, you must sample at a rate fast enough to see every cycle line.
Multiplying the number of cycles by 10 will provide an adequate sampling rate. For
example: for 60 Hz you should sample at 600 samples/sec; and for 50 Hz you should
sample at 500 samples/sec.
To obtain these sample rates [with ChartScan, MultiScan, or NetScan], use the
High-speed, single-channel (Burst Mode).
Question 3: Can I measure multiple channels of 60 cycle “AC RMS” voltage with ChartScan,
MultiScan, or NetScan?
Answer: Yes, providing the amplitude of the signals falls within the range of the card. For
example, if your amplitude was 120V you would need to use a high voltage signal-
conditioning card. Note that the CSN14/HV/S card has a high range of ±250V. To
measure multiple channels of 60 cycle AC RMS (or 50 Hz, AC RMS in Europe),
perform the steps in the following section, Measuring AC RMS.
Measuring AC RMS
The following steps pertain to measuring AC RMS voltage.
1. Determine the peak voltage of the input signal.
2. Based on the value from step 1, select the appropriate VAC option. This is done in ChartView’s
Channel and Alarm Setup window (see following figure).
Choosing A Voltage Type*
* Note: The range of ±250Vwas obtained with a CSN14/HV/S card.
3. In the Acquisition Setup Dialog Box, set the Average Weight to “32.”
Setting Average Weight to 32
(in the Acquisition Setup Dialog Box)
4. Run the acquisition as normal.