Information

NetDAQ specifications
15
• Universal input module: Connect 20 analog inputs of virtually any
sensor type without external signal conditioning
• NetDAQ interfacing: Ethernet network cabling. RS-232 input for calibra-
tion
• External trigger: Activate scanning with real-world events
• Totalizer: Count on/off events, value reported with every scan
• Alarm outputs: Flag out-of-limit conditions to external devices
• Power: Accepts 107 to 264 V ac,or 9 to 16 V dc. Can operate from both
simultaneously for fail-safe power operation
NetDAQ
®
2640A/2645A
Channel capacity
Analog inputs: 20
Measurement rate (2640A)
Slow: 6 Rdgs/s nominal
Medium: 41 (50 Hz), 48 (60 Hz)
Rdgs/s nominal
Fast: 100 Rdgs/s nominal (5 Rdgs/s
for V ac nominal, 140 Rdgs/s on
300 Ω range, 37 Rdgs/s on 3 MΩ
range)
Measurement rate (2645A)
Slow: 45 (50 Hz), 54 (60 Hz) Rdgs/s
nominal
Medium: 200 Rdgs/s nominal
Fast: 1000 Rdgs/s nominal (5 Rdgs/s
for V ac nominal, 370 Rdgs/s on
300Ω range, 44 Rdgs/s on 3 MΩ
range
Analog to digital converter
2640A: Multi-slope type, linear to
18 bits
2645A: Multi-slope type, linear to
16 bits
Common mode rejection
2640A: AC: ≥120 dB (50/60 Hz,
±10.1 % max 1 kΩ source imbal-
ance); DC: ≥120 dB
2645A: AC: ≥100 dB (50/60 Hz,
±10.1 % max 1 kΩ source imbal-
ance); DC: ≥100 dB
Normal mode rejection
50 dB @ 50/60 Hz, ±10.1 % Common
mode and normal mode voltage
maximum
2640A: 300 V dc or V ac rms (chan-
nels 1,11); 150 V dc or V ac rms (all
other channels)
2645A: 50 V dc or 30 V ac rms (all
channels)
Isolation
2640A: Analog input to analog input,
and analog input to any digital input;
meets IEC measurement category II,
ANSI/ISA 61010-1 (82.02.01) :2004,
CAN/CSA C22.2 No. 61010-1:2004 for
150/300 V reinforced
2645A: Analog input to any digital
input; meets IEC measurement cate-
gory II, ANSI/ISA 61010-1 (82.02.01)
:2004, CAN/CSA C22.2 No. 61010-
1:2004 for 150/300 V reinforced
Current measurements
AC or dc current measurements up to
100 mA may be accomplished using
the 2620A-101 10 Ω Current Shunt
Strip
Totalizing input
DC coupled, non-isolated, max +30
V, min -4 V
Max count: 4,294,967,295
Minimum signal: 2 V peak
Threshold: 1.4 V
Rate: 0-5 kHz (debounce off)
Hysteresis: 500 mV
Input debouncing: None or 1.66 ms
Model 2640A NetDAQ
®
Input Range Resolution Accuracy (3-Sigma)
1
DC Volts 90 mV to 150/300 V 0.3 µV to 1 mV 0.01 %
AC Volts
2
300 mV to 150/300 V 10 µV to 10 mV 0.3 %
Resistance 300 Ω to 3 MΩ 1 mΩ to 10 Ω 0.015 %
Frequency 15 Hz to 1 MHz 0.01 Hz to 100 Hz 0.05 %
RTD (Pt100) -200 to 600ºC 0.003 ºC 0.06 ºC
Thermocouples
J -100 ºC to 760 ºC 0.02 ºC 0.35 ºC
K -100 ºC to 1372 ºC 0.02 ºC 0.4 ºC
T -100 ºC to 400 ºC 0.02 ºC 0.3 ºC
Other Thermocouple types R, S, B, C, E, N
Model 2645A NetDAQ
®
Input Range Resolution Accuracy (3-Sigma)
1
DC Volts 90 mV to 50 V 3 µV to 10 mV 0.02 %
AC Volts
2
300 mV to 30 V 10 µV to 1 mV 0.3 %
Resistance 300 Ω to 3 MΩ 10 mΩ to 100 Ω 0.02 %
Frequency 15 Hz to 1 MHz 0.01 Hz to 100 Hz 0.05 %
RTD (Pt100) -200 ºC to 600 ºC 0.03 ºC 0.16 ºC
Thermocouples
J -100 ºC to 760 ºC 0.2 ºC 0.7 ºC
K -100 ºC to 1372 ºC 0.2 ºC 0.8 ºC
T -100 ºC to 400 ºC 0.2 ºC 0.7 ºC
Other Thermocouple types R, S, B, C, E, N
Detailed specifications are available on request.
1
Total instrument accuracy for 90 days following calibration and ambient temperature range of 18 to 28 °C. Includes A/D
errors, linearization conformity, initial calibration error, isothermality errors, reference junction conformity and power line
voltage effects within the range from 107 V ac to 264 V ac.
2
Accuracies for crest factor to 2.0.