Measurement Computing TP ADAC-32 rev.1.0 - Manual (Page 7)

ADAC PCI Series TP ADAC-32 Driver 4
optional clocked 16-bit D/A voltage outputs, two counter input channels, two timer output channels and 48
lines of digital I/O. An eight 4-20mA current loop input option is available by using the TB-PCI-5500-8CL
screw terminal panel.
The PCI-5504HR is the same as the PCI-5503HR above, but with programmable gains of 1, 10, 100.
All boards feature on-board digital calibration for both A/D and D/A, and a DMA engine for optimum
performance in a Windows environment. Board connections are terminated in a 68-pin “high density”
SCSC III connector at the rear of the PC.
The Channel range for the PCI-5500MF board is 0 to 7.
The Channel range for the PCI-5501MF/PCI-5502MF Series is from 0 to 15.
The Channel range for the PCI-5503HR/PCI-5504HR Series is from 0 to 15.
The PCI-5501MF and 5503HR provide programmable gains is 1, 2, 4 and 8.
The PCI-5502MF and PCI-5504HR provide programmable gains is 1, 10, 100 and 1000.
5.1 A/D BURST MODE ACQUISITION
This mode is only supported during StartAD or AcquireAD acquisition. The burst mode registers are used
to provide time interval between channel to channel conversions. The time interval between bursts is
obtained from the specified clocking source that is specified by the A/D rate parameter or external clock
input if the rate is set to 0.
The rate at which the burst conversions are clocked is defined by the TestPoint “Other A/D command,
BURSTRATE(value)” If the BURSTRATE value is not within the limits of the specific board’s
capabilities, an error will be reported by the driver. The rate parameter specified in the “A/D Object”
“StartA/D” or “AcquireA/D” specifies the time between bursts, and must not exceed the BURSTRATE
value divided by total number of channels (see example below).
BURSTRATE = 100000 10us. per sample .
A/D channel(s) = 0,1,2,3,4,5,6,7 Total channels equals 8
Max rate = BURSTRATE / nChannels 12500 = 100000 / 8
Max rate is the Rate parameter that is specified in the TestPoint Acquire or Start A/D command line.
If the rate parameter is set to 0 the Burst Trigger becomes external, but may be set by the TestPoint “Other
A/D command, EXTCLKEDGE(value) as EXT_FALLING_EDGE or EXT_RISING_EDGE”. The
EXTCLKEDGE must be issued just prior to each Start or Acquire command.
Note: The value specified by BURSTRATE is specified in hertz.