Keysight Technologies DAQ970A Technical Overview

Page 10
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Example 3: Thermocouple measurement accuracy
Calculating the total thermocouple reading error is easy with
the DAQ970A—just add the listed measurement accuracy to the
accuracy of your transducer. Switching, conversion, and reference
junction errors are already included in the measurement
specification.
For this example, assume a J-type thermocouple input reading 150°C.
From the following page, total error is:
Thermocouple probe accuracy + 1.0°C
The probe vendor specifies accuracy of 1.1°C
or 0.4%, whichever is greater.
Total error is then:
 1.0ºC+1.1ºC=2.1ºCtotal,or1.4%
Example 4: acV accuracy
The acV function measures the true RMS value of the input
waveform, regardless of waveshape. Listed accuracies assume a
sinewave input. To adjust accuracies for non-sinusoids, use the
listed crest factor adder.
For this example, assume a ± 1 V square wave input with
50% duty cycle and a 1 kHz frequency.
Accuracy for 1 V, 1 kHz sinusoid is:
0.05% reading + 0.02% range = 0.7 mV or 0.07%
DAQ970A Accuracy Specifications ±(% of reading + % of range)
Specifications: DC Voltage and resistance. Automatic calibration (ACAL) capable.
Range
3
24 Hour
4
Tacal ± 1 °C
90 Days
Tacal ± 5 °C
1 Year
Tacal ± 5 °C
2 year
Tacal ± 5 °C
Non ACAL
Temperature
Coefficient /°C
5
With ACAL
Temperature
Coefficient /°C
6
Accuracy ± (% of reading + % of range)
1
DC voltage
2
100 mV 0.0030 + 0.0050 0.0040 + 0.0060 0.0050 + 0.0060 0.0065 + 0.0060 0.0005 + 0.0005 0.0002 + 0.0005
1 V 0.0015 + 0.0006 0.0025 + 0.0006 0.0035 + 0.0006 0.0050 + 0.0006 0.0005 + 0.0001 0.0002 + 0.0001
10 V 0.0010 + 0.0003 0.0021 + 0.0004 0.0030 + 0.0004 0.0045 + 0.0004 0.0005 + 0.0001 0.0002 + 0.0001
100 V 0.0020 + 0.0006 0.0035 + 0.0006 0.0040 + 0.0006 0.0055 + 0.0006 0.0005 + 0.0001 0.0002 + 0.0001
300 V 0.0020 + 0.0020 0.0035 + 0.0020 0.0040 + 0.0020 0.0055 + 0.0020 0.0005 + 0.0001 0.0002 + 0.0001
Resistance
2, 7
100 Ω 0.0030 + 0.0050 0.0050 + 0.0060 0.0060 + 0.0060 0.0070+ 0.0060 0.0006 + 0.0005 0.0002 + 0.0005
1 KΩ 0.0020 + 0.0007 0.0030 + 0.0007 0.0040 + 0.0007 0.0050 + 0.0007 0.0006 + 0.0001 0.0002 + 0.0001
10 KΩ 0.0020 + 0.0005 0.0030 + 0.0005 0.0040 + 0.0005 0.0050 + 0.0005 0.0006 + 0.0001 0.0002 + 0.0001
100 KΩ 0.0020 + 0.0005 0.0030 + 0.0005 0.0040 + 0.0005 0.0050 + 0.0005 0.0006 + 0.0001 0.0002 + 0.0001
1 MΩ 0.0020 + 0.0005 0.0060 + 0.0005 0.0070 + 0.0005 0.0080 + 0.0005 0.0010 + 0.0002 0.0002 + 0.0002
10 MΩ 0.010 + 0.001 0.020 + 0.001 0.025 + 0.001 0.030 + 0.001 0.0030 + 0.0004 0.0030 + 0.0004
100 MΩ 0.100 + 0.001 0.250 + 0.001 0.350 + 0.001 0.400 + 0.001 0.1000 + 0.0001 0.0100 + 0.0001
1000 MΩ 2.000 + 0.001 2.500 + 0.001 3.500 + 0.001 4.000 + 0.001 1.0000 + 0.0001 0.1000 + 0.0001
1. Specificationsarefor60-minutewarm-up,integrationsettingof10or100NPLC,auto-zeroon,ACslowfilter.ACALrunwithinthelast2days&901moduleconnectivity.
2. Thesespecificationsincludeoffsetcharacteristicscontributedbythe901Module&backplane(whichaddsDCV+2uV,4-wireohms+2mΩ)
3. 20% over range on all ranges, except 300 VDC, 300 VAC, 1 ADC, 1 AAC, and diode test have 0%.
4. Relative to calibration standards. 24 hrs spec only applicable when calibrated with the same DAQM901 module that is being used to verify spec.
5. Add this for each °C outside the last ACAL ± 5 °C.
6. Add this for each °C outside the last external standards calibration ± 5 °C.
7. Specifications are for 4-wire ohms function or 2-wire ohms using math null for offset. Without math null, add 2 Ω additional error in 2-wire ohms function. The 100M and 1G
ohm ranges are 2-wire only. See the manual for low power ohms specification and measurement currents.
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Allice Messtechnik GmbH

Keysight Technologies DAQ970A Specifications

General

Brand	Keysight Technologies
Model	DAQ970A
Category	Multiplexer
Language	English