Measurement Computing 200 Series DaqBook - Manual (Page 20)

3-2 DaqBook Hardware 01-23-02 DaqBook User’s Manual
Performance Factors
DaqBooks are flexible when it comes to analog input capabilities. The A/D maximum sample rate is
100 kHz (divide by number of channels for scan rate) with a 16-channel multiplexer and a programmable-
gain input amplifier. Users can expand channel capacity to 256 analog inputs via expansion modules for
multiplexing RTDs, thermocouples, strain gages, anti-aliasing filters, and simultaneous sample and hold
amplifiers.
Expansion cards and modules attach to the DaqBook’s 37-pin P1 I/O connector.
Reference Note: Connector Pinouts begin on page 3-8.
The DaqBooks can perform 100 kHz scan sequences with programmable delays from 10 µs to 10 hours.
The 100 kHz conversion rate fixes the time skew between channels at 10 µs. The 512-location scan
sequencer allows selection of the input amplifier gain for each channel. DaqBook models /100, /120, /200,
and /260 can each scan 16 digital inputs in the same sequence used for analog inputs; such inputs are thus
time-correlated. Optional simultaneous-sample-and-hold (SSH) cards enable DaqBooks to instantaneously
sample up to 256 channels. Scanning and timing specifications are met, even when a DaqBook system
includes a full complement of expansion modules. All types of transducers are scanned within the same
scan group, and with no intervention from the host PC.
DaqBooks offer a wide selection of triggering capabilities. Scans can be triggered by software, a TTL
signal, or a level of analog input [including slope]. The analog input trigger is hardware-based and
minimizes trigger latency to less than 10 µs.
8 DE/16 SE
analog input
multiplexer
512-step, random access
channel/gain sequencer
Programmable
sequencer
timebase.
10 us to 12 hrs
24-bit general purpose
digital I/O lines
16 high-speed
digital inputs
5 counter/timer
channels
4K word
FIFO
data
buffer
Sequencer
reset
P2
DIGITAL I/O
P1
ANALOG I/O
Signal
I/O
Computer
I/O
(DAS-16
compatible)
(PIO-12
compatible)
(CTM-05
compatible)
P3
PULSE/FREQ.
HIGH-SPEED
DIGITAL I/O
PGA
per channel
Amplifier
x1, x2
x4, x8
100kHz
Clock
4 general purpose
digital inputs
-or-
1 auxiliary counter gate
1 TTL trigger input
2 gain select for expansion
Analog Trigger-
Comparator
12 or 16-bit,
100 kHz, A-to-D
Converter
Dual 12-bit DAC
-or-
4 digital outputs
for high-speed
channel expansion
4 general purpose
digital outputs
P5
pass-through
to printer
P4
to PC
parallel
port
or EPP
(Note 2)
VDC
Power In
DC-DC
converter
+5
+15
-15
Hold
Sample
&
Trigger
Select
Note 1: DaqBook/112 and DaqBook/216 do not have P2 or P3 connectors.
Note 2: DaqBook/100 does not have EPP capability (+7-20 VDC for /100, /112, and /120)
(+9-18 VDC for /200)
(+10-24 VDC for /216)
DaqBook Block Diagram
Reference Note: A separate block diagram for DaqBook/260 is presented on page 3-12.
(Note 1)
(Note 1)