ADC 10 User's Guide download pdf (Page 8)

ADC-10,12,40,42 User's Guide6

Product Features

3.1

Specification

Resolution

8 bits

Number of input

channels

Input range

0 to 5 V

Maximum sampling

rate

20 kS/s

Repeatability

±4 LSB at 25°C

Absolute accuracy

±1% typical at 25°C

Overvoltage

protection

±30 V

Input impedance

200 kiloohm

Output connector

D25 to PC parallel port

Input connectors

BNC

Power

requirements

power supply required

Environmental

conditions

0 to 70°C

0 to 95% humidity

NOT water-resistant

3.2

Asynchronously

The Pico USB parallel port takes samples from the product, under its own control, and

stores them until the computer has time to read them. The term asynchronous is

used to indicate that the time the samples are collected is not the same as the time

the PC requests them.

3.3

Streaming

If a device is connected to a Pico USB parallel port, data is collected asynchronously,

without any intervention from the PC. This gives considerably more reliable data

collection, and sampling does not interfere with the operation of the your computer.

When collecting data from a streaming device using the drivers, three modes are

available:

BM_SINGLE - collect a single block of data and exit

BM_WINDOW - collect a series of overlapping blocks of data

BM_STREAM - collect a continuous stream of data.

BM_SINGLE is useful when you wish to collect data at high speed for a relatively short

period. For example, to collect 1000 readings in 50 ms.

BM_WINDOW is useful when collecting several blocks of data at relatively low speeds-

for example when collecting 10000 samples over 10 seconds. Collecting a sequence of

SINGLE blocks like this would take 10 seconds for each block, so displayed data would

not be updated frequently. Using windowing, it is possible to ask for a new block more

frequently, for example every second, and to receive a block containing nine seconds

of data that have already been seen and one second of new data. The block is

effectively a 10-second 'window' that advances one second each time.

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ADC 10 User's Guide Page 8

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