2-2 General Information & Specifications
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Personal Daq User’s Manual
Note:
With the use of USB hubs up to 100 Personal Daq units can be attached to one PC. With 100
Personal Daq/56 modules (each with a PDQ2 expansion module) a total channel capability of
8,000 channels can be obtained. An example of capacity calculation follows.
Calculating System Channel Capacity, An Example
Assume a Personal Daq system is comprised of the following:
•
one Personal Daq/56 unit
•
one PDQ2 expansion module
Using the table on page 2-1 (looking in the bottom row) we see that a Personal Daq/56 with PDQ2 can accept the
following types of channel connections:
•
60
single-ended
(or 30
differential mode
) for volts inputs
•
30
differential mode
for thermocouple inputs
•
16 Digital I/O
•
4 Frequency/Pulse inputs
The maximum channel capacity in this set up is 80 channels. With the use of
differential mode
(instead of
single-ended
) the maximum channel capacity is 50 channels.
In Personal Daq applications, thermocouples should not be connected single-ended. Doing
so can result in noise and false readings. This is especially true when acquiring other high-
amplitude signals in conjunction with thermocouple signals that are connected single-ended.
Features
The Personal Daq system includes the following features:
•
USB connection to the PC means no batteries or other power sources required (see notes)
•
signal input connections via removable screw-terminals
•
high-resolution 22-bit A/D converter
•
internal cold-junction compensator for direct thermocouple measurements
•
500 VDC isolation for PC protection
•
low noise thermocouple and voltage measurements
•
full-scale voltage inputs from –10 VDC to +20 VDC
•
frequency/pulse measurements from DC to 1 Mhz
(Does not apply to Personal Daq/54)
•
digital I/O with current sink capability for direct drive applications
•
with addition of PDQ expansion module, up to 80 channels of analog and digital I/O are available
for one Personal Daq/PDQ combined unit
(Does not apply to Personal Daq/54)
•
up to 100 Personal Daq/PDQ (combined units) can be connected to one PC by the use of USB hubs;
providing a total channel capacity of 8,000 channels
•
digital calibration eliminates the need for potentiometers and user adjustments
•
Personal DaqView
and driver software
•
external power input jack for use with notebook PCs and various setups (discussed in Chapter 3)
Note 1:
Certain system configurations make use of USB hubs and power adapters, as discussed in
Chapter 3.
Note 2:
Some notebook PCs require that a power adapter be used with your Personal Daq.
Chapter 3 contains more information regarding power adapters.
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