8-Channel Strain Gage Modules
Stability, NI 9236
Gain drift ............................................. 6 ppm/°C
Offset drift........................................... 1.7 µV/V/°C
Specifications
The following specifications are typical for the range -40 to 70 °C unless
otherwise noted. The specifications are the same for the NI 9235 and the
NI 9236 unless otherwise noted.
Dynamic Characteristics
Channel-to-Channel Matching (Calibrated)
Input Signal
Frequency (f
in
)
0 to 1 kHz
0 to 4 kHz
Gain
Typical
0.08%
0.17%
Maximum
0.11%
0.32%
Phase
Maximum
0.34°/kHz ·
f
in
Input Characteristics
120
Ω,
10 ppm/°C max
350
Ω,
10 ppm/°C max
24 bits
Delta-sigma
(with analog prefiltering)
Sampling mode ................................... Simultaneous
Internal master timebase (
f
M
)
Frequency........................................ 12.8 MHz
Accuracy ......................................... ±100 ppm max
Data rate range (
f
s
) using internal master timebase
Minimum......................................... 794 S/s
Maximum........................................ 10 kS/s
Data rate range (
f
s
) using external master timebase
Minimum......................................... 195.3125 S/s
Maximum........................................ 10.547 kS/s
f
M
÷ 256 ,
n
= {2, 4, 5, ..., 63}
Data rates (
f
s
) .....................................
n
Full-scale range................................... ±29.4 mV/V
(+62,500 µε/-55,500 µε)
Scaling coefficient .............................. 3.5062 nV/V per LSB
Overvoltage protection
between any two terminals ........... ±30 V
Number of channels............................
Quarter-bridge completion
NI 9235 ...........................................
NI 9236 ...........................................
ADC resolution....................................
Type of ADC ........................................
8 analog input channels
Accuracy, NI 9235
Measurement Conditions
Calibrated typ (25 °C, ±5 °C)
Calibrated max (-40 to 70 °C)
Uncalibrated typ (25 °C, ±5 °C)
Uncalibrated max (-40 to 70 °C)
Percent of Reading
1
(Gain Error)
0.02%
0.07%
0.15%
0.53%
Percent of Range
†, ‡
(Offset Error)
30 Days after
1 Year after
Cal. (±5 °C)
Cal. (±5 °C)
0.1%
0.17%
1.25%
2.14%
0.15%
0.4%
1
Exclusive of lead wire desensitization error.
† Range equals 29.4 mV/V.
‡ Calibrated errors represent offset stability following unstrained measurement.
Errors include the effect of completion resistor tolerance and drift.
Stability, NI 9235
Gain drift ............................................. 6 ppm/°C
Offset drift........................................... 2.2 µV/V/°C
Phase nonlinearity
f
in
= 0 to 1 kHz ................................
f
in
= 0 to 4 kHz ................................
Input delay .........................................
Passband
Frequency........................................
Flatness (f
s
= 10 kS/s).....................
Stopband
Frequency........................................
Rejection.........................................
Alias-free bandwidth ..........................
Oversample rate..................................
Rejection at oversample rate
(f
s
= 10 kS/s) ...................................
Input noise
f
s
= 1 kS/s
NI 9235 .......................................
NI 9236 .......................................
f
s
= 10 kS/s
NI 9235 .......................................
NI 9236 .......................................
SFDR (1 kHz, -60 dBFS)
NI 9235 ...........................................
NI 9236 ...........................................
THD (1 kHz, -20 dBFS)
NI 9235 ...........................................
NI 9236 ...........................................
Crosstalk (f
in
= 1 kHz)..........................
Common-mode voltage,
all signals to earth ground..................
CMRR (f
in
= 0 to 60 Hz)
NI 9235 ...........................................
NI 9236 ...........................................
MTBF ...................................................
±0.002°
±0.1°
38.2/f
s
+ 11 µs
0.45 ·
f
s
33 mdB max
0.55 ·
f
s
100 dB
0.45 ·
f
s
64 ·
f
s
80 dB at 640 kHz
0.38 µV/V
rms
0.25 µV/V
rms
0.85 µV/V
rms
0.5 µV/V
rms
110 dB
115 dB
-90 dB
-95 dB
-100 dB
±60 VDC
120 dB
110 dB
566,796 hours at 25 °C; Bellcore
Issue 2, Method 1, Case 3,
Limited Part Stress Method
Accuracy, NI 9236
Measurement Conditions
Calibrated typ (25 °C, ±5 °C)
Calibrated max (-40 to 70 °C)
Uncalibrated typ (25 °C, ±5 °C)
Uncalibrated max (-40 to 70 °C)
Percent of Reading
1
(Gain Error)
0.02%
0.07%
0.15%
0.53%
Percent of Range
†, ‡
(Offset Error)
30 Days after
1 Year after
Cal. (±5 °C)
Cal. (±5 °C)
0.08%
0.16%
0.79%
1.67%
0.14%
0.39%
Note:
Contact NI for Bellcore MTBF specifications at other temperatures
or for MIL-HDBK-217F specifications.
Shunt Calibration Characteristics
Shunt calibration accuracy
Measurement Conditions
Typical (25 °C, ±5 °C)
Maximum (-40 to 70 °C)
NI 9235 Percent of Reading
(Gain Error)
0.09%
0.22%
NI 9236 Percent of Reading
(Gain Error)
0.07%
0.2%
1
Exclusive of lead wire desensitization error.
† Range equals 29.4 mV/V.
‡ Calibrated errors represent offset stability following unstrained measurement.
Errors include the effect of completion resistor tolerance and drift.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
3
NI [ NATIONAL INSTRUMENTS CORPORATION ]
