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National Instruments Corporation
D-1
D
Common Questions
This appendix lists common questions related to the use of the SCXI-1125.
The SCXI-1125 is backward compatible with the SCXI-1120, but what
are the major differences between the SCXI-1120 and the SCXI-1125?
Table D-1 compares the major specifications and features of the two
modules. Other specifications and features of the SCXI-1125 are the same
or very similar to the SCXI-1120.
Table D-1.
Comparison of the SCXI-1125 with the SCXI-1120
Feature
SCXI-1120
SCXI-1125
Analog input
8
8
Input range
±5 V, ±250 V with SCXI-1327
±5 V, ±300 V with SCXI-1327,
±1000 VDC with TBX-1316
Isolation
250 V
rms
300 V
rms
Gains
1, 2, 5, 10, 20, 50, 100, 200, 250, 500,
1000, and 2000 jumper selectable
1, 2, 5, 10, 20, 50, 100, 200, 250, 500,
1000, and 2000 software selectable
Filters
4 Hz or 10 kHz jumper selectable
4 Hz or 10 kHz software selectable
Autozero
Not supported
Software configurable and scannable
Calibration
Manually rotateable potentiometers
for one-point offset calibration
Software internal one-point offset
calibration, software external
two-point offset and gain calibration,
and onboard calibration constant
storage in EEPROM
Scanning
333 kS/s with consecutive channels
333 kS/s with nonconsecutive and
repeating channels (random scanning)
CJC scanning
M TEMP (non-scannable) or
D TEMP (direct channel)
M TEMP, CJ TEMP (scannable)
Offset error
±6 µV ± 3 mV/gain
0.2 mV/gain typical
Gain error
±0.2% typ, ±0.6% max
±0.03% typ, ±0.08% max
