Data Sheets
Overview
Introduction
The Keysight Technologies, Inc. M9185A is a digital/analog converter (D/A converter) which has eight or 16 independent, isolated channels capable of supplying high voltage levels in parallel as stimulus signals to the device-under-test (DUT), making it ideal for automated test equipment (ATE) in automotive electronics.
Product description
The M9185A is a 2- or 3-slot, PXI based, D/A converter with 16-bit resolution that is capable of providing DC voltages as stimulus to the device-under-test (DUT). The M9185A comes in eight or 16 channel option, where the eight-channel option is a 2-slot size module and the 16-channel option is a 3-slot size module. Each channel in the M9185A D/A converter is capable of supplying voltages between -16 V DC and +16 V DC at 500 μV resolution. Each channel can also generate currents of between -20 mA and +20 mA at 630 nA resolution.
The M9185A D/A converter comes with a built-in hardware remote SENSE feature which acts as a mechanism to detect the output voltage levels and feeds the information back to the compensation circuitry of the converter. It will then use this information to auto adjust its voltage outputs to achieve the desired voltage levels. Additionally, the M9185A D/A converter is capable of providing output to a maximum level of ±16 V per channel.
With the ability to achieve ±16 V output voltage levels and a remote SENSE feature to guarantee that good accuracy is achieved, the M9185A is an ideal module for the automotive industry since most automotive applications require accurate voltage levels between 12 V to 14 V in order to operate the DUT.
NOTE: To ensure that an accurate voltage is present at the loads, it is recommended that you use remote sensing. However, if remote sensing is not used, do not connect loads or cables to the remote sensing terminals (H Sense and L Sense).
Applications
• Automotive electronics test
• Functional test systems requiring isolated biasing channels
• ATE requiring remote sensing
Features
• Eight or 16 Isolated Channels
• Output up to ±16 V DC or ±20 mA DC
• 16-bit resolution
• Isolation: > 80Vdc/ac peak (channel-to-chassis or channel-to-channel)
• Synchronization: Software commands or external trigger
• Remote SENSE feature for accurate output levels (4-wire)
• Interface connector compatibility with cPCI, PXI-H, PXI-1
• Output connection using stacked VHDCI receptacle
• IVI-COM, IVI-C, LabVIEW G drivers
Customer values
• High output voltage levels up to ±16 V for wider range of stimulus voltages
• No pull up circuit required to achieve automotive voltage requirements of 12 V to 14 V
• Remote SENSE feature for accurate output voltages
Easy Setup ... Test ... and Maintenance
Hardware platform
Compliance
The M9185A D/A converter is PXI compliant, using either a cPCI, PXI-1 or PXI Hybrid slot. The product can be integrated with other test and automation modules in cPCI, PXI-1 and PXI-H chassis (hybrid slots). The PXI format offers high performance in a small, rugged package.
It is an ideal deployment platform for many automated test systems. A wide array of complementary PXI products is currently available. Products include multimeters, waveform generators, local oscillators, digitizers, down converters and switch multiplexers.
Remote SENSE mechanism
The precision of the output voltages from D/A converters cannot always be guaranteed since there is no way to instantly obtain the voltage levels at the receiving end of a DUT. Unless a DMM is utilized to measure the voltage and a manual adjustment is made, there is always an uncertainty of the output voltage levels from the D/A converters.
The M9185A’s SENSE mechanism acts as a feedback feature to auto trigger the D/A converter to adjust the voltage levels to achieve better accuracy at the receiving end of a DUT. Figure 1 shows a simplified illustration of how the SENSE mechanism works. The R is actually the path resistance, or may be the lead resistance, without sense, the DMM may only sense D/A converter OUTPUT-R. For instant, the D/A converter outputs 16 V, but DMM may only sense 15.5 V. So the SENSE mechanism will increase the voltage by triggering the D/A converter to increase up to 16.5 V; therefore what the DMM now measures is 16 V.
Using the Remote SENSE
When using the remote sensing feature, connect sense wires from the load to the High Sense and Low Sense terminals for the desired channels. When outputting current the High Sense and Low Sense terminals are not used and are opened. For protection, each channel incorporates a fuse that will open at greater than 20 mA. If an overload condition exists, the fuse will open, but no error will be generated. To reset the fuse, remove the overload and wait a few minutes for the fuse to cool.
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