ACR Electronics PowerWatch Specifikace stáhnout pdf (Strana 47)

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 2002, ACR Systems Inc.

Page 47

3.1.7. Frequently Asked Questions

Q: Each data logger has a serial number. Is this unique in each case?

A: Yes. Each logger has its own unique serial number. Files from data loggers will actually reference this number. When

saving a data file, the name of the file will default to the serial number of the logger that it originates from.

Q: What do we mean by 8-bit or 12-bit logger?

A: 8 bit means one part in 256 and 12 bit means one part in 4096. The output of any sensor connected to an ACR data

logger is converted to an electrical frequency. This frequency is known as an analog signal. This signal is converted inside

the data logger to a digital signal (a series of zeros and ones).

The Analog to digital converter in an 8-bit logger converts the input to a value between 0 to 255. In a 12-bit logger, the

analog to Digital converter is 12 bit. Hence, the input is converted to a number from 0 to 4095 (which means higher

resolution and therefore higher accuracy). For example, if you divide a temperature range of 0 to 100°C to 256 (8-bit

resolution) then each byte count will be equal to 100/256=0.39°C. However if you divide the same temperature range to

4096 (12-bit resolution), then each byte count will be equal to 100/4096=0.024°C.

Q: What is a byte count?

A: From the above example, byte count on the 8-bit logger is equal to 0.39°C and on the 12 bit logger it is 0.024°C

Q: How do we connect the logger to a computer? Is it an RS-232 connection?

A: The connection is through the serial port of the computer. It is an RS-232 connection. For more information on

connecting your logger to a computer, please refer to How Do I Connect to My Computer section.

Q: What is the shortest and longest sample sample interval with JR. data loggers?

A: The sample interval is fixed at 2 minutes.

Q: What is the IC-101?

A: The IC-101 interface cable is a special adapter that is capable of communicating with most ACR data loggers. The IC-

101 is not used with the ACR JR., ACR PowerWatch or OWL loggers.

Q: When does the logger start sampling (recording)?

A: As soon as you clear the logger (or save a setup to the logger) it starts recording. You can use the "Start Delay"

feature of the logger and set the logger to start at a particular date and time. The logger will continue recording and if the

option "Stop When Full" is enabled, it will stop recording (when the memory is full), otherwise, the logger will continue

recording and will overwrite the oldest data (when the memory is filled up).

Q: Where is the internal temperature sensor located on the logger?

A: The internal temperature sensor is soldered on to the board and is located in the casing.

Q: What is a the battery expiration indicator?

A: It is an approximate indication when the logger battery will require replacement, based on normal operating conditions.

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ACR Electronics PowerWatch Specifikace Strana 47