Test the connections – National Instruments AT E Series User Manual
Page 144
Appendix A
Specifications for Maximum Signal Ratings for AT Series Devices
© National Instruments Corporation
A-39
Test the Connections
The easiest way to check the proper limits of the I/O signals is to measure
them with a voltmeter. Be sure to check the signal levels before connecting
them to the I/O connector of the DAQ device. Connect the negative lead
(usually black) of the voltmeter to a ground terminal on the computer
chassis. This can be a grounding lug at the back of the computer, or any part
of the base metal computer chassis. Then measure each signal input using
the voltmeter’s positive terminal (usually red). In the case of a differential
signal, measure each signal in the differential pair individually. Measure
both the DC and AC voltage of each signal.
EXTREF
±25 V
1
±15 V
1
±35 V
±25 V
±25 V
2
±15 V
2
PFI0
5.5 to –0.5 V
3
±35 V
4
5.5 to –0.5 V
3
±0.5 V
5
5.5 to –0.5 V
3
±0.5 V
5
PFI<1..9>
5.5 to –0.5 V
3
±0.5 V
5
5.5 to –0.5 V
3
±0.5 V
5
5.5 to –0.5 V
3
±0.5 V
5
DIO<x>
5.5 to –0.5 V
3
±0.5 V
5
5.5 to –0.5 V
3
±0.5 V
5
5.5 to –0.5 V
3
±0.5 V
5
PA, PB, PC<x>
N/A
N/A
5.5 to –0.5 V
3, 6
±0.5 V
5, 6
N/A
N/A
DACxOUT
Output only
EXTSTROBE*
Output only
SCANCLK
Output only
GPCTR0_OUT
Output only
FREQ_OUT
Output only
VCC
Output only
1
N/A for AT-MIO-16XE-10 and AT-AI-16XE-10.
2
N/A for AT-MIO-16XE-50, PCI-MIO-16XE-50, and DAQPad-MIO-16XE-50.
3
When configured as a digital input.
4
When PFI0 is configured as an analog trigger or the DAQ device is powered off, the input protection level is ±35 V.
5
The E Series devices guarantee a powered off input protection level of ±0.5 V. This level can be exceeded if the source of
the input signal has a current limited output, such as any member of the LS, HC, or HCT logic families.
6
N/A for AT-MIO-16E-10.
Signal Name
AT-MIO-16E-1
AT-MIO-16E-2
AT-MIO-64E-3
AT-MIO-16XE-10
AT-AI-16XE-10
AT-MIO-16E-10
AT-MIO-16DE-10
AT-MIO-16XE-50
On
Off
On
Off
On
Off