Page 1 User’s Guide Keysight DAQ970A Data Acquisition System Distributed by: dataTec ▪ Ferdinand-Lassalle-Str. 52 ▪ 72770 Reutlingen ▪ Tel. 07121 / 51 50 50 ▪ Fax 07121 / 51 50 10 ▪ info@datatec.de ▪ www.datatec.de...
Page 2: Table Of Contents
Use the Built-in Help System View the list of help topics View the help information for a front panel key View the instrument information Adjust the Carrying Handle Rack Mounting the Instrument Keysight BenchVue Data Acquisition (DAQ) Software Keysight DAQ970A User's Guide...
Page 3 DAC output and sense channels (Channels 04 through 07) Computed Channel Basic math Polynomial fifth order Statistics Scanning with External Instruments Channel Labeling [Interval] Menu Selecting the trigger source Selecting the output trigger polarity Specifying number of sweeps in the scan Keysight DAQ970A User's Guide...
Page 4 DAQM905A Dual 1:4 RF Multiplexer (50 Ω) Module DAQM907A multifunction module DAQM908A 40-channel single-ended multiplexer 4 Measurement Tutorials System Cabling and Connections Cable specifications Grounding techniques Shielding techniques Separation of high-level and low-level signals Source of system cabling errors Measurement Fundamentals The Internal DMM Keysight DAQ970A User's Guide...
Page 5 Sources of Error in Multiplexing and Switching Actuators and General-Purpose Switching Matrix Switching RF Signal Multiplexing Multifunction Module Digital Input Digital Output Using an External Pull-Up Driving External Switches Totalizer Totalizer Errors Analog Output (DAC) Relay Life and Preventive Maintenance Keysight DAQ970A User's Guide...
Page 6: Notices
No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies as governed by United States and international copyright laws.
Page 7: Warranty
52.227-19 (June 1987) or any equivalent agency regulation or contract clause. Use, duplication or dis- closure of Software is subject to Keysight Technologies’ standard commercial license terms, and non-DOD Departments and Agencies of the U.S. Government will receive no greater than Restricted Rights as defined in FAR 52.227-19(c) (1-2) (June 1987).
Page 8: Declarations Of Conformity
Notices Declarations of Conformity Declarations of Conformity for this product and for other Keysight products may be downloaded from the Web. Go to https://regulations.about.keysight.com/DoC/default.htm, you can then search by product model number to find the latest Declaration of Conformity. Keysight DAQ970A User's Guide...
Page 9: Safety And Regulatory Information
Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, intended use of the instrument, and could res- ult in electrical shock or injury. Keysight Technologies assumes no liability for the customer's failure to com- ply with these requirements.
Page 10 DO NOT MODIFY THE INSTRUMENT Do not install substitute parts or perform any unauthorized modification to the product. Return the product to a Keysight Sales and Service Office for service and repair to ensure that safety features are maintained. DO NOT MEASURE MORE THAN THE RATED VOLTAGE...
Page 11: Safety Symbols And Regulatory Markings
Do not use detergent or solvents. Do not attempt to clean internally. If needed, contact a Keysight Technologies Sales and Service Office to arrange for proper cleaning to ensure that safety features and performance are maintained.
Page 12 This product is marked with the ACMA RCM mark for compliance in Australia/New Zealand. A copy of the Manufacturer's Australia Declaration of Conformity for this instrument can be obtained by con- tacting your local Keysight Technologies Sales Representative. This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use.
Page 13: South Korean Class A Emc Declaration
이 기 기 는 업 무 용 환 경 에 서 사 용 할 목 적 으 로 적 합 성 평 가 를 받 은 기 기 로 서 가 정 용 환 경 에 서 사 용 하 는 경 우 전 파 간 섭 의 우 려 가 있 습 니 다 . 사용자 안내문은"업무용 방송통신기자재"에만 적용한다. Keysight DAQ970A User's Guide...
Page 14: Safety And Emc Requirements
Canada: ICES/NMB-001:2006 Australia/New Zealand: AS/NZS CISPR 11:2011 South Korea RRA Notice 2016-24 Environmental Conditions Keysight DAQ970A is designed for indoor use and in an area with low condensation. Table below shows the general environmental requirements for this instrument. Environmental condition Requirement Temperature Operating condition: 0 °C to 55 °C...
Page 15 Safety and Regulatory Information Keysight DAQ970A User's Guide...
Page 16: Introduction To The Instrument
Front Panel at a Glance Instrument Annunciators Rear Panel at a Glance Plug-In Modules at a Glance Dimension Diagram Remote Interface Configuration LAN Configuration Procedure Firmware Update Contacting Keysight Technologies This chapter introduces the overview and basic functionality of the DAQ970A. Keysight DAQ970A User's Guide...
Page 17: Instrument At A Glance
1 Introduction to the Instrument Instrument at a Glance The DAQ970A combines precision measurement capability with flexible signal connections for your pro- duction and development test systems. Three module slots are built into the rear of the instrument to accept any combination of data acquisition or switching modules. The combination of USB data logging and data acquisition features make this instrument a versatile solution for your testing requirements now and in the future.
Page 18: Front Panel At A Glance
Measurement operation menu (to control the initiation of the measurements) Measurement configuration menu (to set parameters for measurements) Knob Cursor navigation keypad Front panel key Press the key to return the instrument into local control when the instrument is in remote (indicated by the annunciator). Keysight DAQ970A User's Guide...
Page 19: Instrument Annunciators
1 Introduction to the Instrument Instrument Annunciators The table below shows the various annunciators that are available on the DAQ970A. The annunciators will be shown on the top of the display when the corresponding conditions are met. Annunciator Description Monitor mode is enabled.
Page 20: Rear Panel At A Glance
Rear Panel at a Glance Label Description Slot identifier (100, 200, 300) External trigger input, alarm outputs, channel advance input, and channel close output AC mains input Instrument cable lock LAN interface connector Chassis ground screw USB interface connector Keysight DAQ970A User's Guide...
Page 21: Plug-In Modules At A Glance
1 Introduction to the Instrument Plug-In Modules at a Glance The DAQ970A offers a complete selection of plug-in modules to provide a high quality measurement, switching, and control capabilities. For more details, see Module Overview. Supported modules on the DAQ970A:...
Page 22: Dimension Diagram
1 Introduction to the Instrument Dimension Diagram Bench dimension: Rack dimension: Module dimension: Keysight DAQ970A User's Guide...
Page 23: Remote Interface Configuration
USB Settings for more information. Keysight IO Libraries Suite Ensure that the Keysight IO Libraries Suite is installed before you proceed for the remote interface configuration. Keysight IO Libraries Suite is a collection of free instrument control software that automatically discovers instruments and allows you to control instruments over LAN and USB interfaces. For more information, or to download the IO Libraries, go to www.keysight.com/find/iosuite.
Page 24 Press [Home] > User Settings > I/O > LAN Settings > Modify SYSTem:COMMunicate:LAN:DHCP ON Settings. Set the first softkey to DHCP. If you change this parameter, you must press [Done] > [Apply SYSTem:COMMunicate:LAN:UPDate Changes] for the change to take effect. To disable DHCP: Keysight DAQ970A User's Guide...
Page 25 Host Name IP Address Subnet Mask Gateway Primary and Secondary DNS Primary and Secondary WINS Service mDNS Host Name A hostname is the host portion of the domain name, which is translated into an IP address. Keysight DAQ970A User's Guide...
Page 26 Each instrument is shipped with a default host name with the format: K-modelnumber-serialnumber , where modelnumber is the instrument’s 7-character model number (e.g. DAQ970A), and serialnumber is the last five characters of the 10-character instrument serial number located on the label on the top of the unit (e.g.
Page 27 Do not set a gateway address when DHCP is enabled (factory default). Contact your LAN administrator to obtain an IP address. This setting is non-volatile, it will not be changed by cycling power, factory reset (*RST com- mand), or instrument present (SYSTem:PRESet command). Keysight DAQ970A User's Guide...
Page 28 This setting is non-volatile, it will not be changed by cycling power, factory reset (*RST com- mand), or instrument present (SYSTem:PRESet command). Service mDNS An mDNS (multicast Domain Name Service) is an Internet service that is registered with the selected nam- ing service. Keysight DAQ970A User's Guide...
Page 29: Lan Services
Each instrument is shipped with a default service name with the format: Keysight Technologies_<modelNumber>_- serialNumber where modelNumber is the instrument 7-character model number (DAQ970A) and product name (Data Acquisition System), and serialNumber is the last five characters of the 10-character instrument serial num- ber located on the label on top of the unit (e.g.
Page 30: Set To Defaults
Press [Home] > User Settings > I/O > LAN Reset LXI:RESet Web Interface The DAQ970A includes a built-in Web Interface for remote instrument access and control over LAN via a Web browser. Further details, refer to Interface. More about IP addresses and dot notation Dot-notation addresses ("nnn.nnn.nnn.nnn"...
Page 31 To use Easy File Access at the same time that you are remotely programming the instrument with SCPI over the USB interface (USB SCPI), you must have Keysight IO Libraries Suite 16.3 or later installed on your PC. You may download the latest version at www.keysight.com/find/iosuite.
Page 32: Technical Connection Details
Interface Details VISA String: TCPIP0::<IP Address>::inst0::INSTR Example: TCPIP0::192.168.10.2::inst0::INSTR Web Interface Port number 80, URL http://<IP address>/ USB ID is in the form of USB0::<Vendor ID>::<Prod ID>::<Serial Number>::0::INSTR Example: USB0::0x2A8D::0x0902::MY55160003::0::INSTR Keysight DAQ970A User's Guide...
Page 33: Lan Configuration Procedure
"nnn.nnn.nnn.nnn" where "nnn" in each case is a byte value in the range 0 through 255. You can enter a new IP address using the knob or the front panel arrow keys. Do not enter leading zeros. Keysight DAQ970A User's Guide...
Page 34 Set the "DNS Server" addresses. From the LAN configuration screen, press More to go to the second of three sets of softkeys. Enter the Primary DNS and Second DNS . See your network administrator for details. Keysight DAQ970A User's Guide...
Page 35: Firmware Update
SYSTem:PERSona:MODel to set the *IDN? to match the actual model number, update the firmware, and then use SYSTem:PERSona:MODel again to set the *IDN? response to the other model number. Keysight DAQ970A User's Guide...
Page 36: Contacting Keysight Technologies
1 Introduction to the Instrument Contacting Keysight Technologies You can contact Keysight Technologies for warranty, service, or technical support. In the United States: (800) 829-4444 In Europe: 31 20 547 2111 In Japan: 0120-421-345 www.keysight.com/find/assist to contact Keysight worldwide, or contact your Keysight Technologies representative.
Page 37: Quick Start
2 Quick Start Quick Start Prepare Instrument for Use Module Wiring Connection and Installation Connect Power and I/O Cables Use the Built-in Help System Adjust the Carrying Handle Rack Mounting the Instrument Keysight BenchVue Data Acquisition (DAQ) Software Keysight DAQ970A User's Guide...
Page 38: Prepare Instrument For Use
2 Quick Start Prepare Instrument for Use Verify that you received the following items. If anything is missing, please contact your nearest Keysight sales office or Keysight authorized reseller. Power cord (for country of destination) Certificate of calibration (optional) Supplemental documentation packet USB 2.0 cable...
Page 39: Module Wiring Connection And Installation
To connect wiring to a module and install to the rear panel of the instrument, follow the five steps shown below: 1. Using a flat head screwdriver, push forward to detach the cover from the module. Keysight DAQ970A User's Guide...
Page 40 2 Quick Start 2. Connect the wiring to the screwdriver. 3. Route the wiring through the strain relief. 4. Replace the module cover. Keysight DAQ970A User's Guide...
Page 41 2 Quick Start 5. Install the module in to the instrument (at the rear panel). Keysight DAQ970A User's Guide...
Page 42 2 Quick Start Uninstalling the Module To unplug or replace any modules, push inward the clip located at rear left side of the module, and then pull it out from rear panel. Keysight DAQ970A User's Guide...
Page 43: Connect Power And I/O Cables
If the power-on self test fails, the error annunciator, is displayed on the screen. See "SCPI Error Messages" in the DAQ970A Programming Guide for more information on SCPI error codes and error messages. A complete self-test performs a more extensive set of tests than those performed at power-on. See the DAQ970A Service Guide for more informationon the instrument complete self-test procedure.
Page 44: Use The Built-In Help System
[Select] to view the help contents. In this example, we selected 1 Get HELP on any key . The following help topic appears: Press Done to exit the help. Keysight DAQ970A User's Guide...
Page 45: View The Help Information For A Front Panel Key
View the instrument information Press [Home] > Help > About to view the instrument information such as product serial number, IP address (when connected to LAN interface), and currently installed firmware revision. Press Done to exit. Keysight DAQ970A User's Guide...
Page 46: Adjust The Carrying Handle
2 Quick Start Adjust the Carrying Handle The carrying handle has three positions (as shown below). To adjust the handle position, grasp the sides of the handle, pull outward, and rotate the handle. Bench-top viewing positions Carrying position Keysight DAQ970A User's Guide...
Page 47: Rack Mounting The Instrument
Instructions and mounting hardware are included with each rack-mount- ing kit. Any Keysight System II instrument of the same size can be rack-mounted beside the DAQ970A. To prevent overheating, do not block air flow to or from the instrument. Allow enough clearance at the rear, sides, and bottom of the instrument to permit adequate internal air flow.
Page 48 2 Quick Start Rack mounting instruments side-by-side To rack mount two instruments side-by-side, order the lock-link kit (part number: DAQA194A-FG) and flange kit (part number: DAQA191A-FG). Be sure to use the support rails inside the rack cabinet. Keysight DAQ970A User's Guide...
Page 49: Keysight Benchvue Data Acquisition (Daq) Software
After the trial period expires, you will be required to purchase a software license for that application. Keysight's flexible licensing options allow you to select the license type and license terms that best fit your software needs. For more information on purchasing and installing a software license, see BenchVue Software Licensing Options in the Keysight BenchVue Data Acquisition (DAQ) Software Help .
Page 51: Features And Functions
Features and Functions System Overview Front Panel Menu Reference [Scan] Key [Monitor] Menu [Home] Menu [View] Menu [Channel] Menu [Interval] Menu [Math] Menu [Copy] Menu [Alarm] Menu [Utility] Menu [Module] Menu [Save Recall] Menu Web Interface Module Overview Keysight DAQ970A User's Guide...
Page 53: System Overview
PC-based tasks. DAQ970A logic circuitry As shown below, the logic circuitry for the DAQ970A is divided into two sections: earth-referenced and float- ing. These two sections are isolated from each other in order to maintain measurement accuracy and repeatability. See Noise Caused by Ground Loops for further details on ground loops.
Page 54 Plug-in modules The DAQ970A offers a complete selection of plug-in modules to give you high-quality measurement, switch- ing, and control capabilities. The plug-in modules communicate with the floating logic via the internal isol- ated digital bus.
Page 55 For example, when measuring a ther- mocouple, the instrument measures a DC voltage and mathematically converts it to a corresponding tem- perature in °C, °F, or K. Keysight DAQ970A User's Guide...
Page 56: Signal Routing And Switching
Alarm limits The DAQ970A has four alarm outputs which you can configure to alert you when a reading exceeds spe- cified limits on a channel during a scan. You can assign a high limit, low limit, or both to any configured channel in the scan list.
Page 57 Use a matrix for switching low-frequency (less than 10 MHz) signals only. A matrix is arranged in rows and columns. For example, a simple 3×3 matrix could be used to connect three sources to three test points as shown below: Keysight DAQ970A User's Guide...
Page 58: Measurement Input
Measurement Input The DAQ970A allows you to combine a DMM (either internal or external) with multiplexer channels to cre- ate a scan. During a scan, the instrument connects the DMM to the configured multiplexer channels one at a time and makes a measurement on each channel.
Page 59 Analog-to-digital conversion (ADC) The ADC takes a prescaled DC voltage from the signal-conditioning circuitry and converts it to digital data for output and display on the front panel. The ADC governs some of the most basic measurement Keysight DAQ970A User's Guide...
Page 60: Scanning
You can set the instrument's internal timer to automatically scan at a specific interval as shown below. You can also program a time delay between channels in the scan list. Keysight DAQ970A User's Guide...
Page 61: Scanning With External Instruments
You can start a scan when an alarm condition is logged on the channel being monitored. Scanning with external instruments You can use the DAQ970A for signal routing or control applications. If you install a multiplexer plug-in module, you can use the DAQ970A for scanning with an external instrument. You can connect an external instrument (such as a DMM) to the multiplexer COM terminal.
Page 62: The Multifunction Module
You can read the live status of the bits on the port or you can configure a scan to include a digital read. Each port has a separate channel number on the module and contains 8-bits. You can com- bine the two ports to read a 16-bit word. Keysight DAQ970A User's Guide...
Page 63: Control Output
Control Output In addition to signal routing and measurement, you can also use the DAQ970A to provide simple control outputs. For example, you can control external high-power relays using the actuator module or a digital output channel.
Page 64 The multifunction module has two analog outputs capable of outputting calibrated voltages between ±12 V with 18 bits of resolution. Each DAC (Digital-to-Analog Converter) channel can be used as a pro- grammable voltage source for analog input control of other devices. A simplified diagram is shown below: Keysight DAQ970A User's Guide...
Page 65 Each channel can switch up to 300 V DC or AC rms. Each switch can also switch up to 1 A DC or AC rms up to maximum 50 W. For example, the maximum current that you can switch at 120 V is 0.45 A as shown below: For control applications, the actuator has the following advantages: Keysight DAQ970A User's Guide...
Page 66 When used with high-power devices, however, it is critical that you provide protection to the switch from capacitive and inductive loads to ensure maximum relay life. For more information on attenuators, see Using Attenuators. Keysight DAQ970A User's Guide...
Page 67: Front Panel Menu Reference
Configures the measurement scaling (mX+b, %, dBm, or dB) on the current channel. Copies the measurement configuration from the selected channel(s) to other channel(s). Configures alarm on the selected channel. There are four configurable alarms in this instrument. Self-test. Calibration. Autocalibration. Instrument security (NISPOM). Firmware update. Keysight DAQ970A User's Guide...
Page 68 Saves the readings from trend chart or histogram. Captures and saves the screen image. Instrument factory reset and system preset. Data logging to a USB drive on the front panel. Returns the instrument into local control when the instrument is in remote. Keysight DAQ970A User's Guide...
Page 69: [Scan] Key
(using the In Scan softkey). Also, see the for more information on how the [Scan] key is used when the manual trigger mode is selec- [Interval] Menu ted. Keysight DAQ970A User's Guide...
Page 70: [Monitor] Menu
Displays readings as a number. Press Peak to enable (On) or disable (Off) the measurement of the Minimum, Maximum, and Peak to Peak values acquired within the measurement aperture. When enabled, Clear Peaks softkey will display. Press Keysight DAQ970A User's Guide...
Page 71: Bar Meter
Bar Meter The bar meter adds a moving bar below the standard Number display. The Peak and Statistics softkeys behave as they do in Number display. The Scale softkey specifies how the meter scale is determined. Keysight DAQ970A User's Guide...
Page 72: Trend Chart
In Recent mode, the trend chart displays data taken during a specified amount of time. The Vertical Scale softkey specifies how the current vertical scale is determined. Keysight DAQ970A User's Guide...
Page 73: Histogram
In the graphic below, cursor B1 (violet vertical lines) is positioned on bin number 30 and cursor B2 (green vertical lines) is positioned on bin number 50 (bin number shown above the B2 softkey). The bin inform- Keysight DAQ970A User's Guide...
Page 74 In the graphic above: Span: 0.210m - The measurement range covered from B1 to B2. #6776 - The number of samples from B1 to B2. 30.9% - The percentage of the total number of samples from B1 to B2. Keysight DAQ970A User's Guide...
Page 75: [Home] Menu
Strain offset is also known as the unstrained value. You can select one or more channels on which you want to measure the offset value. The strain formula will automatically use this offset value when calculating the measurement result. Keysight DAQ970A User's Guide...
Page 76 Pressing this softkey will enable the Measure Now and Clear Offsets softkeys. 2. Press Select All to enable the offset measurement on all listed channels. Press this softkey again to dis- able the offset measurement on all listed channels. Keysight DAQ970A User's Guide...
Page 77: Alarm Output
Track - The alarm output is asserted when a channel's reading crosses a limit, and remains asserted only while subsequent readings remain outside the limit. When a reading returns within the limits, the output is automatically cleared. Keysight DAQ970A User's Guide...
Page 78: Help
The serial number and version information are unaffected. Use this setting to avoid changing exist- ing test system code where the manufacturer or model number are verified and to maximize backwards compatibility with the Keysight 34970A and 34972A. Keysight DAQ970A User's Guide...
Page 79 3 Features and Functions The default settings return " Keysight Technologies " followed by the model number " DAQ970A ". For more information, see the *IDN? and SYSTem:PERSona Subsystem commands in the Keysight DAQ970A Pro- gramming Guide. Important: In order to update the instrument firmware from remote, the model number in the *IDN? response must match the actual instrument model number.
Page 80 Use the knob or the front panel arrow keys to set the year, month, day, hour, and minute. Number Format Number Format specifies how numbers are displayed on the front panel: 12,345.6 or 12.345,6. Other pos- sibilities also exist. For example, you can use the space as a separator. Sounds Keysight DAQ970A User's Guide...
Page 81 3 Features and Functions Enables or disables the tone heard associated when an error is generated from the front panel or remote interface ( Beeper ), or the click heard when keys are pressed ( Key Click ). Keysight DAQ970A User's Guide...
Page 82: [View] Menu
( First Page ), or starting from the most recent sweep ( Last Sweep ). Use the knob or the front panel arrow keys to view the list on subsequent pages; use the right/left arrow keys to move or return the readings to the last/first page. Trend Chart Keysight DAQ970A User's Guide...
Page 83 Y2 softkey. You can then use the up or down arrows keys to increment/decrement the digit and move the cursor up or down by that amount. Cursor X1 and Y1 are violet; cursor X2 and Y2 are green. Press Cursors > Cursors to display the choices: Keysight DAQ970A User's Guide...
Page 84 Y2 - Use the knob or the front panel arrow keys to control the Y2 cursor. Track Rdng at X - Select two readings, by reading number, using X1 and X2 softkeys to display X (time) and Y (magnitude) values for each reading, and the delta X and delta Y values. Keysight DAQ970A User's Guide...
Page 85 Displays the scanned memory readings of a selected channel in statistics format (Maximum, Minimum, Peak to Peak, Average, and Standard Deviation). Toggle between Statistics to display the per-channel stat- istics and Pk Times to display the time of occurrence of the per-channel minimum and maximum peak read- ings. Keysight DAQ970A User's Guide...
Page 86: View Alarm Queue
When the front panel Error annunciator (ERR) turns on, one or more command syntax, execution, or hard- ware errors have been detected. A record of up to 20 errors is saved in the instrument's error queue. Keysight DAQ970A User's Guide...
Page 87: View Number Of Relay Cycles
Each module counts the number of closures on each relay and saves the counts in non-volatile memory on the module. Below image shows the number of cycles for all relays on the DAQM901A mul- tiplexer module. Keysight DAQ970A User's Guide...
Page 88: [Channel] Menu Overview
[Channel] Menu Overview [Channel] Menu Overview Measurements on Multiplexer Modules DAQM907A Multifunction Module Computed Channel Scanning with External Instruments Channel Labelling Keysight DAQ970A User's Guide...
Page 89: Measurements On Multiplexer Modules
[Channel] Menu Overview Measurements on Multiplexer Modules The Keysight DAQ970A supports many common measurement functions with the multiplexer module. With any multiplexer module installed on the rear panel, press [Module] and use the knob or the front panel arrow keys to navigate into the desired multiplexer module.
Page 90: Temperature
4. Press Sensor Settings > Sensor , specify the type of transducer probe used as TCouple , and press Type softkey to select the type of thermocouple. Supported types are J (default), K, E, T, N, R, B, and S. Keysight DAQ970A User's Guide...
Page 91 AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. 2-wire and 4-wire thermistor Keysight DAQ970A User's Guide...
Page 92 4. Press Sensor Settings > Sensor , specify the type of transducer probe used as 2-wire or 4-wire Therm , and press Type softkey to select the type of thermistor. Supported types are 2.2K, 5K (default), and 10K. Keysight DAQ970A User's Guide...
Page 93 2-wire and 4-wire RTD 1. Connect an RTD to the module's screw terminals. 2-wire RTD: Keysight DAQ970A User's Guide...
Page 94 5. Press Use as ref to enable ( On ) or disable ( Off ) the currently selected channel to be used as the ref- erence channel for subsequent thermocouple measurements that specify an external reference source. Keysight DAQ970A User's Guide...
Page 95 AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. Keysight DAQ970A User's Guide...
Page 96: Strain
When a force is applied to a body, the body deforms. The deformation per unit length is called strain (ε). Strain may be either tensile (+) or compressive (-). The DAQ970A supports two types of strain measurements: Bridge configuration Direct resistive method Once you have configured strain measurement function in all strain channels, press [Home] >...
Page 97 120% of the present range, and down a range below 10% of the present range. 4. Press Sense Settings > Sense , specify the strain measurement method as full and half bridge in bend- ing arrangements. Keysight DAQ970A User's Guide...
Page 98 Auto Zero - Autozero provides the most accurate measurements, but requires additional measurement time to perform the zero measurement. With autozero enabled ( On ), the instrument internally measures the offset following each measurement. It then subtracts that measurement from the preceding reading. Keysight DAQ970A User's Guide...
Page 99 This section describes how to configure the selected channel for full and half Poisson bridge strain gage measurements from the front panel. 1. Connect bridge configuration source to the module's screw terminals. Full bending bridge: Half bending bridge: 2. Press [Channel] > Measure , and select STRAIN from the selection menu. Keysight DAQ970A User's Guide...
Page 100 Excitation Voltage - Use the knob or the front panel arrow keys to specify the fixed excitation voltage applied to the bridge by an external voltage source. This value will be used to convert strain bridge meas- urements on the selected channel. Keysight DAQ970A User's Guide...
Page 101 Full bridge in bending Poisson arrangement This section describes how to configure the selected channel for full bending Poisson bridge strain gage measurements from the front panel. 1. Connect bridge configuration source to the module's screw terminals. Full bending bridge: Keysight DAQ970A User's Guide...
Page 102 120% of the present range, and down a range below 10% of the present range. 4. Press Sense Settings > Sense , specify the strain measurement method as full bridge in bending Pois- son arrangement. Keysight DAQ970A User's Guide...
Page 103 (PLC). Only 1 PLC and longer times provide normal mode (line frequency noise) rejection. Selecting 100 or 200 PLC provides the best noise rejection and resolution. Time - Directly sets the integration time in seconds. Advanced settings Press Advanced to configure the advanced settings for the measurement. Keysight DAQ970A User's Guide...
Page 104 (autorange) automatically selects the range for the measurement based on the input. Autoranging is convenient, but it results in slower measurements than using a manual range. Autoranging goes up a range at 120% of the present range, and down a range below 10% of the present range. Keysight DAQ970A User's Guide...
Page 105 (PLC). Only 1 PLC and longer times provide normal mode (line frequency noise) rejection. Selecting 100 or 200 PLC provides the best noise rejection and resolution. Time - Directly sets the integration time in seconds. Advanced settings Keysight DAQ970A User's Guide...
Page 106 The measurement configurations for 2-wire and 4-wire direct resistive are same, below descriptions explained by using 2-wire resistance measurements. 1. Connect direct resistive source to the module's screw terminals. 2-wire direct strain: 4-wire direct strain: Keysight DAQ970A User's Guide...
Page 107 (strain) along the axis of the gage. The larger the value, the more sensitive strain gage. Gage factor is a dimensionless quantity. The typical value is approximately 2. Gage Ohms - Gage resistance to be used to convert direct strain measurements on the selected chan- nel. Keysight DAQ970A User's Guide...
Page 108 AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. Keysight DAQ970A User's Guide...
Page 109: Dc Voltage
(PLC). Only 1 PLC and longer times provide normal mode (line frequency noise) rejection. Selecting 100 or 200 PLC provides the best noise rejection and resolution. Time - Directly sets the integration time in seconds. Advanced settings Keysight DAQ970A User's Guide...
Page 110 AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. Keysight DAQ970A User's Guide...
Page 111: Ac Voltage
For example, when you are measuring a signal between 20 and 200 Hz, you should use the 20 Hz filter. If measurement speed is not an issue, choosing a lower frequency filter may result in quieter meas- urements, depending on the signal that you are measuring. Keysight DAQ970A User's Guide...
Page 112 AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. Keysight DAQ970A User's Guide...
Page 113: Dc Current
(PLC). Only 1 PLC and longer times provide normal mode (line frequency noise) rejection. Selecting 100 or 200 PLC provides the best noise rejection and resolution. Time - Directly sets the integration time in seconds. Advanced settings Keysight DAQ970A User's Guide...
Page 114 AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. Keysight DAQ970A User's Guide...
Page 115: Resistance
2-wire resistance measurements. 1. Connect resistance source to the module's screw terminals. 2-wire ohms: 4-wire ohms: 2. Press [Channel] > Measure , and select OHMS or OHMS 4W from the selection menu. Keysight DAQ970A User's Guide...
Page 116 Typically, this is about 1/10th the cur- rent sourced for the standard resistance measurements. The approximate current sourced for each meas- urement range is shown at the bottom of the resistance range softkeys, for example: (~ 1 mA). Keysight DAQ970A User's Guide...
Page 117 AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. Keysight DAQ970A User's Guide...
Page 118: Frequency And Period
AC Filter - Specifies which AC filter to use. The instrument uses three different AC filters that enable you either to optimize low frequency accuracy or achieve faster AC settling following a change in input signal amplitude. Keysight DAQ970A User's Guide...
Page 119: Diode
AC filter setting. By selecting Time , the specified delay (time in seconds) is inserted between the relay closure and the actual measurement on each channel, in addition to any delay that will implicitly occur due to relay settling time. Keysight DAQ970A User's Guide...
Page 120: Capacitance
DAQM907A Multifunction Module - Overview There are total 7 channels available in the DAQM907A multifunction module. Keysight DAQ970A User's Guide...
Page 121: Digital I/O (Dio) Channels (Channel 01 And 02)
You can read the live status of the bits on the port or you can configure a scan to include a digital read. To configure the DIO channel 1. Press [Module] and use the knob or the front panel arrow keys to select the slot containing the mul- tifunction module. Keysight DAQ970A User's Guide...
Page 122 Press Read to define the DIO direction as Input. To write to a digital output port 1. Press [Module] and use the knob or the front panel arrow keys to select the slot containing the mul- tifunction module. Keysight DAQ970A User's Guide...
Page 123 3. Press Write > Base and use the knob or the front panel arrow keys to select the number base used ( Hex , Binary , or Decimal ), and then press Pattern to define each output pattern from the selected base. Keysight DAQ970A User's Guide...
Page 124: Totalizer Channel
You can manually read the totalizer count or you can configure a scan to read the count. To configure the totalizer channel with the multifunction module: 1. Press [Module] and use the knob or the front panel arrow keys to select the slot which containing the DAQM907A multifunction module. Keysight DAQ970A User's Guide...
Page 125: Dac Output And Sense Channels (Channels 04 Through 07)
(channel 06 and 07). Any of these channels may be scanned. For the DAC output channels, no actual output measurement is made; the scanned value will be the pro- grammed output value (voltage or current). Keysight DAQ970A User's Guide...
Page 126 If the output channel is set to current mode, the sense channel will measure voltage. 1. Press [Module] and use the knob or the front panel arrow keys to select the slot containing the mul- tifunction module. Keysight DAQ970A User's Guide...
Page 127 5. Enable Lock ( On ) to lock the DAC output channel mode or disable Lock ( Off ) to disable the lock on the DAC output channel mode. 6. Press Write > Output to set the output voltage/current level, and then press Write Output to output the voltage/current from the selected DAC output channel. Keysight DAQ970A User's Guide...
Page 128: Computed Channel
Table below shows the supported basic math operations with the respective softkey label. Operation Softkey label Subtract Multiply Divide Reciprocal Power Square root Sqrt(A) For example, to perform the Add operation from measurement channels (channel 101 and 102) to the com- puted channel (channel 401): Keysight DAQ970A User's Guide...
Page 129: Polynomial Fifth Order
2. Press Coef to cycle through the coefficient order ( Coef #5 , Coef #4 , Coef #3 , Coef #2 , Coef #1 , and Coef #0 ). Specify the coefficient parameters for each coefficient order. Keysight DAQ970A User's Guide...
Page 130: Statistics
1. Press Equation > Avg(list) , use the knob or the front panel arrow keys to select the operand channels in the Select softkey, then press Add to List to add the selected operand channel to the operand channel list. Press this softkey repeatedly to add the subsequent operand channel to the operand channel list. Keysight DAQ970A User's Guide...
Page 131 Number Format for details. You can also include the computed channel as a operand channel in the computed channel list. For example, to include the computed channel 401 from above example to other computed channel (channel 402): Keysight DAQ970A User's Guide...
Page 132 3. Press once on the [Scan] key to initiate a scan. You can view the scanned memory readings by pressing [View] key. The result of Average operation will display as below: Channel 402 = (Channel 101+102+103+401)/4 Keysight DAQ970A User's Guide...
Page 133: Scanning With External Instruments
(Immediate). For more information, refer to Scan Interval. You can configure the event or action that noti- fies the DAQ970A to advance to the next channel in the scan list. Note that the Channel Advance source shares the same sources as the scan interval. However, an error is generated if you attempt to set the chan- nel advance source to the same source used for the scan interval.
Page 134: Channel Labeling
Channel Label > Clear All > Done . This setting is applicable to all modules installed, as well as the computed channels. [Interval] Menu Press [Interval] key on the front panel to configure what starts each a sweep and the number of sweeps in the scan. Keysight DAQ970A User's Guide...
Page 135: Selecting The Trigger Source
Selecting the output trigger polarity Press Ch Closed softkey to select the rising edge ( Pos ) or falling edge ( Neg ) as the Chan Closed signal on the rear panel Ext Trig/Alarm connector. Keysight DAQ970A User's Guide...
Page 136: Specifying Number Of Sweeps In The Scan
The instrument can hold up to 100,000 readings in reading memory, after which the annunciator will be displayed indicating reading memory overflow. Any new readings will overwrite the first (oldest) readings saved; the most recent readings are always preserved. Keysight DAQ970A User's Guide...
Page 137: [Math] Menu
°C. Press Measure Offset to perform an immediate offset measurement and save the offset value for sub- sequent measurement. Keysight DAQ970A User's Guide...
Page 138: Scaling
= measurement in dBm - reference value in dBm To configure, select scaling function as dB and press Settings to open the configuration menu. Keysight DAQ970A User's Guide...
Page 139 The reference value can be a measurement converted to dBm ( Measure Ref Value softkey), or you can spe- cify a reference value ( dB Ref Value softkey). Press Clear dB Ref to clear the reference value for dB measurements. Keysight DAQ970A User's Guide...
Page 140: [Copy] Menu
In this example, use the knob or the front panel arrow keys to determine both Start Channel and End Channel as channel 02. Press Done to proceed. Keysight DAQ970A User's Guide...
Page 141: Copy/Paste From A Single Channel To Multiple Channels (One-To-Many)
In this example, use the knob or the front panel arrow keys to determine both Start Channel as channel 02 and End Chan- nel as channel 03. Press Done to proceed. Keysight DAQ970A User's Guide...
Page 142: Copy/Paste From Multiple Channels To Multiple Channels (Many-To-Many)
2. Press [Copy] > Source Chan(s) . Use the knob or the front panel arrow keys to determine the Start Channel as channel 01 while End Channel as channel 04. Press Done to exit this menu. Keysight DAQ970A User's Guide...
Page 143 05 through 08. "4 of 4 Channels Copied" message will prompt out when the operation is completed. Press Copy Now to repeatedly copy the same configuration to the new selected channels (channels 09 through 11, and so on). Keysight DAQ970A User's Guide...
Page 144: [Alarm] Menu
To configure, select limits type as Low and press Set Limits to specify lower limit value. The lower limit value must always be less than or equal to the upper limit. 3. Press Clear to return the limit value to the default value, 0. Keysight DAQ970A User's Guide...
Page 145: Configuring Alarm Limits With The Multifunction Module
1. On a multifunction module slot, press [Alarm] and select the totalizer channel. 2. Press Set Limits > Limit Count to specify the limit count. An alarm will be generated when a specific count is reached during scanning. Keysight DAQ970A User's Guide...
Page 146: Alarm Limit Indications
FAIL indicates that a limit has been exceeded. Trend Chart The trend chart (below) uses the same color scheme. The following example shows a limit violation. Histogram The histogram (below) uses the same color scheme. The following example shows a limit violation. Keysight DAQ970A User's Guide...
Page 147 [Channel] Menu Overview Keysight DAQ970A User's Guide...
Page 148: [Utility] Menu
This can help to eliminate the errors to achieve a better performance. In this DAQ970A, autocalibration is performed on the internal DMM and on the DAC output and sense channels (channels 04 through 07) on the DAQM907A multifunction module.
Page 149: Calibrate
Monthly - Schedules the monthly autocalibration to start at a specific day and time (hour and minute) of each month. Calibrate Calibrate accesses the instrument calibration procedure. See Keysight DAQ970A Service Guide for further details. Keysight DAQ970A User's Guide...
Page 150: Security
New Code - Press this softkey to enter a new secure code used to unlock instrument security. The code must start with a letter and may have up to 12 letters, digits, or the underscore character. LOCK - Locks instrument security using the current secure code. Secure code was set to "DAQ970A" at the factory.
Page 151: Admin
IP address. This feature is not recommended for use in routine applications because of the possibility of unintended data loss. Admin Press Firmware Update to update the instrument firmware to a new version. See Firmware Update details. Keysight DAQ970A User's Guide...
Page 152: [Module] Menu
Sends a Card Reset to the module. This opens all channels on the module. On the multifunction module, this also configures the digital I/O ports as inputs and sets the DAC outputs to voltage mode (if not locked) and the output level to 0. Keysight DAQ970A User's Guide...
Page 153: Module Labeling
Note that you are only allowed to enter maximum of 10 characters for the module label, including letters, numbers, and special characters. To return into the default module label, press Module Label > Clear All > Done . Keysight DAQ970A User's Guide...
Page 154: [Save Recall] Menu
Rename - To rename a file or folder, press Rename . Browse to the file or folder to be renamed and press Select . Press New Name , enter a new name and press Done . Press Perform Rename > Done . Keysight DAQ970A User's Guide...
Page 155 Use the knob, front panel arrow keys, and [Select] to navigate through the list, and press Select or Cancel to exit the browse window. The left and right arrow keys contract or expand a folder. Perform Copy Perform Copy copies the selected file or folder to its new location. Keysight DAQ970A User's Guide...
Page 156: Save
Screen to save the screen in the file and format specified. The content captured is the display state at the time the [Save Recall] key was pressed. Browse Opens a browser for the internal flash memory and external USB memory. Keysight DAQ970A User's Guide...
Page 157 .sta or .prf extension to the file name. State - Saves the measurement configuration including channel configurations and scan settings. Preference - Saves non-volatile settings associated with instrument, including user preferences and I/O settings. Keysight DAQ970A User's Guide...
Page 158: Recall
USB drive (External). Use the right arrow key to expand a folder. Press Select to recall the selected file. Set to Defaults The Set to Defaults softkey allows you to return the selected settings to their Factory Reset and Preset val- ues. Keysight DAQ970A User's Guide...
Page 159: Factory Reset
The square brackets ( [ ] ) are not actually part of the directory name, and the yyyymmdd_hhmmssmmm is a timestamp indicating the approximate start of the scan. The format is year (yyyy), month (mm), day (dd), underscore (_), hours (hh), minutes (mm), seconds (ss), and milliseconds (mmm). For example, the folder named: Keysight DAQ970A User's Guide...
Page 160 40-channel, 1-wire armature multiplexer s01-s40 The format for all USB data files is similar to what Keysight BenchLink Data Logger produces by default. The default field separator is a comma, but you can use the Seperator softkey to specify a different sep- arator.
Page 161 If the row limit feature is ON and the data spills over into multiple files, scan numbering continues where it left off in the previous file. Thus, the first scan in the second data file would be number 65,536, the first scan in the third data file would be number 131,071, and so on. Keysight DAQ970A User's Guide...
Page 162: Web Interface
[Channel] Menu Overview Web Interface The Keysight DAQ970A Data Acquisition System include a built-in Web Interface for monitoring and con- trolling the instrument via a Web browser. Two available options to access the Web Interface: LAN Interface: Connect your instrument to the LAN interface and enter the instrument's IP address into the address bar at the top of your PC's Web browser.
Page 163: Control Instrument Page
Click Edit button to edit network configuration page. When done, click Apply Changes to accept new set- tings or click Cancel to ignore changes. Click Advanced options button to reset network configuration options. Help page Help is available for each of the tabs described above. For example: Keysight DAQ970A User's Guide...
Page 164 [Channel] Menu Overview Keysight DAQ970A User's Guide...
Page 165: Module Overview
DAQM901A 20-Channel Armature Multiplexer Module DAQM902A 16-Channel Reed Multiplexer Module DAQM903A 20-Channel Actuator/General-Purpose Switch Module DAQM904A 4x8 Two-Wire Matrix Switch Module DAQM905A Dual 1:4 RF Multiplexer (50 Ω) Module DAQM907A Multifunction Module DAQM908A 40-Channel Single-ended Multiplexer Module Keysight DAQ970A User's Guide...
Page 166: Daqm900A 20-Channel Fet Multiplexer Module
ENVIRONMENTAL HEALTH AND SAFETY When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A User's Guide...
Page 167: Daqm901A 20-Channel Armature Multiplexer Module
ENVIRONMENTAL HEALTH AND SAFETY When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A User's Guide...
Page 168: Daqm902A 16-Channel Reed Multiplexer Module
ENVIRONMENTAL HEALTH AND SAFETY When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A User's Guide...
Page 169: Daqm903A 20-Channel Actuator/General-Purpose Switch Module
ENVIRONMENTAL HEALTH AND SAFETY When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A User's Guide...
Page 170: Daqm904A 4X8 Two-Wire Matrix Switch
ENVIRONMENTAL HEALTH AND SAFETY When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A User's Guide...
Page 171: Daqm905A Dual 1:4 Rf Multiplexer (50 Ω) Module
ENVIRONMENTAL HEALTH AND SAFETY When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A User's Guide...
Page 172: Daqm907A Multifunction Module
Move the Totalize Threshold jumper to the “AC” position to detect changes through 0 V. Move the jumper to the “TTL” position (factory setting) to detect changes through TTL threshold levels. Analog Output (DAC) Output and Sense Keysight DAQ970A User's Guide...
Page 173 TO PREVENT ELECTRICAL SHOCK To prevent electrical shock, use only wire that is rated for the highest voltage to any channel. Before removing a module cover, turn off all power to external devices connected to the module. Keysight DAQ970A User's Guide...
Page 174: Daqm908A 40-Channel Single-Ended Multiplexer
ENVIRONMENTAL HEALTH AND SAFETY When any channel is connected to a hazardous voltage source, the instrument and the device under test should be supervised, following local EHS practices to restrict access. Keysight DAQ970A User's Guide...
Page 175: 4 Measurement Tutorials
This chapter describes methods that you can use to reduce errors that can affect your measurements. You will also find information to help you better understand how the DAQ970A makes meas- urements and what you can do to get the best results.
Page 176: System Cabling And Connections
Dielectric withstand voltage - Must be high enough for your application. To prevent electrical shock or equipment damage, insulate all channels to the highest potential in the system. It is recommended that you use a wire with at least 600 V rated insulation. Keysight DAQ970A User's Guide...
Page 177 30 mΩ 50 mΩ [1] Recommended wire size for the screw terminals on the DAQ970A plug-in modules. Cable capacitance - Varies with insulation type, cable length, and cable shielding. Cable should be kept as short as possible to minimize cable capacitance. In some cases, low-capa- citance cable can be used.
Page 178: Grounding Techniques
10 MHz, use the separate grounding system. For signals between 1 MHz and 10 MHz, you can use a single-point system if the longest ground return path is kept to less than 1/20 of a wavelength. In all cases, return-path resistance and inductance should be minimized. Keysight DAQ970A User's Guide...
Page 179: Shielding Techniques
To reduce the interference, try to minimize the exposure of the system cabling to high-frequency RF sources. If your application is extremely sensitive to RF1 radiated from the instrument, use a common mode choke Keysight DAQ970A User's Guide...
Page 180 The table below shows common ther- moelectric voltages for connections between dissimilar metals. Copper-to- Approx. µV/°C Copper <0.3 Gold Silver Brass Beryllium Copper Aluminium Kovar or Alloy 42 Silicon Copper-Oxide 1000 Cadmium-Tin Solder Tim-Lead Solder Keysight DAQ970A User's Guide...
Page 181 As shown below, any voltage difference between the two ground reference points (V ) causes a current to flow through the LO measurement ground lead. This causes an error voltage (V ) which is added to the measured voltage. Keysight DAQ970A User's Guide...
Page 182 It is recommended that you either use two different modules or separate the high-level signals from the low-level signals with an unused channel connected to ground. Keysight DAQ970A User's Guide...
Page 183: Measurement Fundamentals
4 Measurement Tutorials Measurement Fundamentals This section explains how the DAQ970A makes measurements and discusses the most common sources of error related to these measurements. The internal DMM Temperature measurements DC voltage measurements AC voltage measurements Current measurements Resistance measurements Strain gage measurements...
Page 184: Temperature Measurements
Your measurement requirements will help you to determine which temperature transducer type to use. Each transducer type has a particular temperature range, accuracy, and cost. The table below summarizes some typical specifications for each transducer type. Use this information to help select the transducer for Keysight DAQ970A User's Guide...
Page 185 An RTD has the highest stability of the temperature transducers. The output from an RTD is also very linear. This makes an RTD a good choice for high-accuracy and long-term measurements. The DAQ970A sup- ports RTDs with α = 0.00385 (DIN / IEC 751) using ITS-90 software conversions. “PT100” is a special label that is sometimes used to refer to an RTD with α...
Page 186 The T-type thermocouple is a unique case since one of the conductors (copper) is the same metal as the internal DMM’s input terminals. If another type of thermocouple is used, two additional thermocouples are created. For example, take a look at the connections with a J-type thermocouple (iron and constantan): Keysight DAQ970A User's Guide...
Page 187 4 Measurement Tutorials Keysight DAQ970A User's Guide...
Page 188 In some measurement situations, however, it would be nice to remove the need for an ice bath (or any other fixed external reference). To do this, an isothermal block is used to make the connections. An Keysight DAQ970A User's Guide...
Page 189 Thermocouples are available in a variety of types. The type is specified by a single letter. The table below shows the most commonly used thermocouple types and some key characteristics of each. The thermocouple conversion routines used by the DAQ970A are compatible with the International Temperature Scale of 1990 (ITS-90).
Page 190 Platinum -13% Rho- Rhodium -50 °C - 1760 °C ±0.6 °C - 1.5 °C Higher temperature. U.S. dium Beware of con- British Black Blue tamination. White White Do not insert in metal Japanese White tubes. French Green Yellow Keysight DAQ970A User's Guide...
Page 191 A resistance meas- urement of more than 5 kΩ. typically indicates a defective thermocouple. The DAQ970A contains a built-in, automatic thermocouple check feature. If you enable this feature, the instrument measures the channel res- istance after each thermocouple measurement to ensure a proper connection.
Page 192 As the induced current flows to ground through the internal DMM, voltage errors are generated along the distributed resistance of the thermocouple wire. Adding a shield to the thermocouple wire will shunt the common mode noise to earth ground and preserve the measurement. Keysight DAQ970A User's Guide...
Page 193: Dc Voltage Measurements
Signal Conditioning for DC Measurements Input signal conditioning for DC voltage measurements includes both amplification and attenuation. A sim- plified input to the internal DMM is shown below: Keysight DAQ970A User's Guide...
Page 194 10 GΩ. On the 100V and 300V input ranges, the input resistance is determined by the total resistance of the 100:1 divider. You can also set the input resistance to 10 MΩ by continuously closing the High V switch. Keysight DAQ970A User's Guide...
Page 195 (50 Hz or 60 Hz), the noise can be greatly reduced by setting the internal DMM’s integration time to 1 PLC or greater. Where: = Common mode float voltage = LO lead resistance = Isolation resistance = Isolation capacitance = Parallel impedance of R Keysight DAQ970A User's Guide...
Page 196 DMM to 1 PLC or greater. Loading Errors Due to Input Resistance Measurement loading errors occur when the resistance of the device-under-test (DUT) is an appreciable percentage of the instrument’s own input resistance. The diagram below shows this error source: Keysight DAQ970A User's Guide...
Page 197: Ac Voltage Measurements
× R AC Voltage Measurements The main purpose of an AC “front end” is to change an AC voltage input into a DC voltage which can be measured by the ADC. Signal Conditioning for AC Measurements Keysight DAQ970A User's Guide...
Page 198 An average responding AC multimeter is calibrated to read the same as a true RMS meter for sine- wave inputs only. For other waveform shapes, an average responding meter will exhibit substantial errors as shown below: Keysight DAQ970A User's Guide...
Page 199 If the sample-to-sample levels are similar, little settling time is required for each new reading. Under this specialized condition, the medium filter (20 Hz) will provide reduced accuracy results at 5 readings per second, and the fast filter (200 Hz) will provide reduced accuracy results at 50 readings per second. Keysight DAQ970A User's Guide...
Page 200 = DMM's crest factor crest factor Error = Estimated bandwidth error as shown below: bandwidth Where: C.F. = Signal crest factor F = Fundamental input signal frequency BW = DMM's -3 dB bandwidth (1 MHz for the DAQ970A) Keysight DAQ970A User's Guide...
Page 201 You should also connect the shield to the input LO terminal. Be sure to minimize the area of any ground loops that cannot be avoided. A high-impedance source is more susceptible to noise pickup than a low-impedance source. You can reduce the high-frequency Keysight DAQ970A User's Guide...
Page 202: Current Measurements
IR drop. This voltage drop is sensed by the internal DMM and scaled to the proper current value to complete the measurement (see the discussion on the following page). Keysight DAQ970A User's Guide...
Page 203 AC current is larger due to the internal DMM’s series inductance and the measurement connections. The burden voltage increases as the input frequency increases. Some circuits may oscillate when performing current measurements due to the internal DMM’s series inductance and the meas- urement connections. Keysight DAQ970A User's Guide...
Page 204: Resistance Measurements
2-wire method. The 4-wire ohms method is used almost exclusively for measuring lower resistance values in any application, especially for values less than 10 Ω and for high-accuracy requirements such as RTD tem- perature transducers. Keysight DAQ970A User's Guide...
Page 205 Offset compensation can be used for 2-wire or 4-wire ohms measurements (but not for RTD or thermistor measurements). The DAQ970A disables offset compensation when the measurement function is changed or after a Factory Reset (*RST command). An Instrument Preset (SYSTem:PRESet command) or Card Reset (SYSTem:CPON command) does not change the setting.
Page 206: Strain Gage Measurements
When a force is applied to a body, the body deforms. The deformation per unit length is called strain (ε). Strain may be either tensile (+) or compressive (-). Practical strain values are usually quite small (typically less than 0.005 inch/inch for most metals) and are often expressed in micro-strains (µε). There are three Keysight DAQ970A User's Guide...
Page 207 Strain gages are available in various numbers and configurations of elements. The most common element is the single gage form shown below. Multi-element strain gages, also called rosettes, are used to measure Keysight DAQ970A User's Guide...
Page 208 Using the measurement scaling function (mX+b) with the equations shown below will allow you to display results directly in strain on the DAQ970A front-panel display. You can use a custom measurement unit to display readings in “µε” (micro-strain) directly. The instrument will automatically add the micro (“µ”) prefix based upon actual calculated values.
Page 209: Frequency And Period Measurements
With a reciprocal counter, the number of digits of resolution scales with the gate time. If a 1-second gate gives six digits of resolution, a 0.1-second gate gives five digits, and so forth. Keysight DAQ970A User's Guide...
Page 210: Capacitance Measurements
External shielding and low-pass filtering may help. Capacitance Measurements The DAQ970A makes capacitance measurements by applying a known current to charge the capacitance and then a resistance to discharge as shown below: Keysight DAQ970A User's Guide...
Page 211: Low-Level Signal Multiplexing And Switching
Low-level multiplexers are available in the following types: one-wire, 2-wire, and 4-wire. The following sec- tions in this chapter describe each type of multiplexer. The following low-level multiplexer modules are available with the DAQ970A. DAQM900A 20-Channel FET Multiplexer DAQM901A 20-Channel Armature Multiplexer...
Page 212: One-Wire (Single-Ended) Multiplexers
1 and a temperature measurement on channel 2. The instrument first closes the channel 1 relay, makes the voltage measurement, and then opens the relay before moving on to channel 2 (called break-before-make switching). Other low-level switching modules available with the DAQ970A include the following: DAQM903A 20-Channel Actuator DAQM904A 4×8 Two-Wire Matrix...
Page 213: Four-Wire Multiplexers
When making a 4-wire measurement, the test current flows through the source connections from the HI terminal through the resistor being measured. To eliminate the test lead resistance, a separate set of sense connections are used as shown below: Keysight DAQ970A User's Guide...
Page 214: Signal Routing And Multiplexing
Although noise problems apply to the entire system, they can become especially acute for switching. Switch networks contain a high concentration of signals, which magnify the errors. Most problems with electric noise can be traced to improper grounding and shielding. Keysight DAQ970A User's Guide...
Page 215 ). The multiplexer channels are divided into two banks. The bank switch isolates one bank of channels from the other, effectively removing any parallel adjacent capacitance from the isolated bank. During a scan, the instrument automatically controls the bank switches. Keysight DAQ970A User's Guide...
Page 216: Actuators And General-Purpose Switching
This module offers simple on-off switching which you can use to control power devices or for cus- tom switching applications. For example, you can use an actuator to build a simple resistance ladder as shown below: Keysight DAQ970A User's Guide...
Page 217 First, the total circuit capacitance (C ) must be such that the peak voltage across the open relay contacts does not exceed 300 V . The equation for determining the minimum allowable cir- cule capacitance is: Keysight DAQ970A User's Guide...
Page 218: Matrix Switching
Use a matrix for switching low-frequency (less than 10 MHz) signals only. A matrix is arranged in rows and columns. For example, a simple 3x3 matrix could be used to connect three sources to three test points as shown below: Keysight DAQ970A User's Guide...
Page 219 You can combine two or more matrix switches to provide more complex switching. For example, the DAQM904A provides a 4-row by 8-column matrix. You can combine two of these modules as either a 4- row by 16-column matrix or an 8-row by 8-column matrix. An 8x8 matrix is shown below: Keysight DAQ970A User's Guide...
Page 220: Rf Signal Multiplexing
50 Ω impedance in the signal line being switched. In a test system, these switches are often used to route a test signal from a signal source to the device-under-test. The switches are bi-directional. The dia- gram below shows two examples of a 4-to-1 channel RF multiplexer in a test system. Keysight DAQ970A User's Guide...
Page 221 These modules respond only to the CLOSE com- mand (OPEN does not apply). To open a channel, send the CLOSE command to another channel in the same bank. Note that DAQM905A module do not automatically terminate open channel. Keysight DAQ970A User's Guide...
Page 222: Multifunction Module
An open input floats to +5 V and is read as a "1". An input shorted to ground is read as a "0". An example of a contact close detection channel is shown below: Keysight DAQ970A User's Guide...
Page 223 4 Measurement Tutorials Keysight DAQ970A User's Guide...
Page 224: Digital Output
For non-TTL logic you must provide an external pull-up. A description of the pull-up cal- culation is given on the following section. If used with an external power supply and pull-up, the external supply must be greater than +5 VDC and less than +42 VDC. Keysight DAQ970A User's Guide...
Page 225: Using An External Pull-Up
You can use two digital output channels to control an external switch. For example, you can drive the Key- sight 876X series of microwave switches using an external power supply and two digital output channels. The state of the 2-to-1 multiplexer is changed by setting the appropriate output bit low (0). Keysight DAQ970A User's Guide...
Page 226: Totalizer
The totalizer only counts when both terminals are enabled. You can use the either G terminal, the terminal, or both. When a gate is not connected, the gate terminal floats to the enabled state, effectively creating a "gate always" condition. Keysight DAQ970A User's Guide...
Page 227: Totalizer Errors
The DAQM907A module has two analog outputs and senses capable of outputting calibrated voltages or currents with 18 bits of resolution. Each DAC (Digital-to-Analog Converter) channel can be used as a programmable voltage or current source for analog input to other devices. Keysight DAQ970A User's Guide...
Page 228 The DAC output is not linear, but is stepped as progressively larger (or smaller) voltages are programmed. The step is in 100 µV. Integral error Refers to the difference between the programmed voltage and the actual output voltage from the DAC. Keysight DAQ970A User's Guide...
Page 229: Relay Life And Preventive Maintenance
4 Measurement Tutorials Relay Life and Preventive Maintenance The DAQ970A Relay Maintenance System automatically counts the cycles on each relay in the instrument and stores the total count in nonvolatile memory on each switch module. Use this feature to track relay fail- ures and predict system maintenance requirements.
Page 230 20 to 50 times its initial value, the contact resistance becomes very erratic and the relay should probably be replaced. For most applications, a relay with contact resistance greater than 1 Ω should be replaced. The graph below shows the typical contact resistance characteristics of the relays used on the DAQ970A switch- ing modules.
Page 231 For switching frequency and replacement strategy as described above, you can use the DAQ970A Relay Maintenance System to track and even predict relay failures.
Page 232 This information is subject to change without notice. © Keysight Technologies 2018 Edition 1, November 1 2018 Printed in Malaysia *DAQ97-90000* DAQ97-90000 www.keysight.com Distributed by: dataTec ▪ Ferdinand-Lassalle-Str. 52 ▪ 72770 Reutlingen ▪ Tel. 07121 / 51 50 50 ▪ Fax 07121 / 51 50 10 ▪ info@datatec.de ▪ www.datatec.de...

Keysight DAQ970A User Manual

1 Introduction to the Instrument

2 Quick Start

3 Features and Functions

4 Measurement Tutorials

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