VTI Instruments EX1629 - Page 19

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EX1629 Introduction 19
SHUNT CALIBRATION
INTERNAL RESISTOR
55 kΩ (0.1%, 25 ppm/°C) per channel standard (0.05%, 5 ppm/°C optional)
EXTERNAL RESISTOR
Front panel connection shared among 16 channels
Connection resistance: 16 Ω typical
RESISTOR CONNECTION
Software selectable: local (across completion resistor) or remote
QUARTER-BRIDGE STRAIN MEASUREMENTS
Excitation
Gain
Range
1
Gain Accy
2
Offset Accy
2,3
Gain TC
4
Offset TC
4
10 V
100
+30927 µε/-29126 µε
±0.12%
±25 µε
±50 ppm/ºC
±4 µε/ºC
5 V
100
+63829 µε/-56603 µε
±0.12%
±25 µε
±50 ppm/ºC
±4 µε/ºC
Note 1: Nominal for balanced bridge
Note 2: Conditions:
GF = 2.0, R
comp
= 350 Ω, balanced excitation
<30 days, ±5 ºC from last self-calibration
15 ºC to 35 ºC, 1 year from full calibration
Assumes the excitation voltage is measured and used in the conversion. Valid for 30 days, ±5 ºC.
Includes the stability effects of the excitation source.
60 minute warm-up
Exclusive of lead wire desensitization errors
Exclusive of gage errors
Exclusive of noise
Note 3: <30 days, ±5 ºC from unstrained voltage measurement.
Note 4: Only applies outside of self-calibration window
FULL-BRIDGE STRAIN MEASUREMENTS
Excitation
Gain
Range
1
Gain Accy
2
Offset Accy
2,3
Gain TC
4
Offset TC
4
5 V
100
±15000 µε
±0.05%
±1.5 µε
±50 ppm/ºC
±0.2 µε/ºC
2.5 V
100
±30000 µε
±0.06%
±3 µε
±60 ppm/ºC
±0.4 µε/ºC
Note 1: Nominal for balanced bridge
Note 2: Conditions:
GF = 2.0, balanced excitation, remote sense
<30 days, ±5 ºC from last self-calibration
15 ºC to 35 ºC, 1 year from full calibration
Assumes the excitation voltage is measured and used in the conversion. Valid for 30 days, ±5 ºC.
Includes the stability effects of the excitation source.
60 minute warm-up
Exclusive of gage errors
Exclusive of noise
Note 3: <30 days, ±5 ºC from unstrained voltage measurement.
Note 4: Only applies outside of self-calibration window
CONFIDENCE MEASUREMENTS
TOTAL EXCITATION VOLTAGE
±(0.012% + 500 µV)
±EXCITATION VOLTAGE
±(0.012% + 2.5 mV)
±EXCITATION CURRENT
±(0.1% + 50 µA)
COMMON MODE VOLTAGE
±(0.1% + 2.5 mV)
SAMPLING RATE
Approximately 500 Sa/s