DAQ VXI-SC-1102 Bedienerhandbuch PDF herunterladen (Seite 37)

National Instruments Corporation 3-1 DAQ Hardware Overview Guide

LPM Devices

This chapter contains overview information on the PC-LPM-16 and

PC-LPM-16PnP.

LPM Device Analog Input

The LPM devices contain 16 multiplexed, single-ended analog input

channels numbered 0 through 15. The analog input channels are driven into

a 12-bit, self-calibrating ADC. The devices have no gains on the analog

input.

You can configure analog input (hardware jumpers on the PC-LPM-16 or

software configuration on the PC-LPM-16PnP) for four different input

ranges:

• 0 to +5 V (unipolar)

• 0 to +10 V (unipolar)

• −2.5 to +2.5 V (bipolar)

• −5 to +5 V (bipolar)

You can initiate A/D conversions through software or by applying active

low pulses to the EXTCONV* input on the I/O connector. On the

PC-LPM-16, a 16-word-deep FIFO memory on the device stores up to

16 A/D conversion results; on the PC-LPM-16PnP, a 256-word-deep FIFO

stores up to 256 A/D conversion results.

LPM Device Data Acquisition

The LPM devices can perform single-channel data acquisition and

multiple-channel scanned data acquisition. For single-channel data

acquisition, you select a single analog input channel. The device performs

a single A/D conversion on that channel every sample interval.

For multiple-channel scanned data acquisition, the device scans a sequence

of analog input channels. A sample interval indicates the time to elapse

between A/D conversions on each channel in the sequence. You need to

select only a single starting channel to select the sequence of channels to

scan. The device then scans the channels in consecutive order until

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 150 151

Keine Kommentare

DAQ VXI-SC-1102 Bedienerhandbuch Seite 37