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USB-1616HS-BNC User's Guide

Functional Details

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USB-1616HS-BNC block diagram

Figure 4 shows a simplified block diagram of the USB-1616HS-BNC. This device provides all of the functional
elements shown in the figure.

Figure 4. USB-1616HS-BNC functional block diagram

Synchronous I/O – mixing analog, digital, and counter scanning

The USB-1616HS-BNC can read analog, digital, and counter inputs, while generating up to two analog outputs
and digital pattern outputs at the same time. Digital and counter inputs do not affect the overall A/D rate
because these inputs use no time slot in the scanning sequencer.

For example, one analog input channel can be scanned at the full 1 MHz A/D rate along with digital and counter
input channels. Each analog channel can have a different gain, and counter and digital channels do not need
additional scanning bandwidth as long as there is at least one analog channel in the scan group.

Digital input channel sampling is not done during the "dead time" of the scan period where no analog sampling
is being done either.

Analog input

The USB-1616HS-BNC has a 16-bit, 1-MHz A/D coupled with 16 differential analog inputs. Seven software
programmable ranges provide inputs from ±10 V to ±100 mV full scale.

Analog input scanning

The USB-1616HS-BNC has several scanning modes to address various applications. You can load the
512-location scan buffer with any combination of analog input channels. All analog input channels in the scan
buffer are measured sequentially at 1 µs per channel by default.

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Содержание USB-1616HS-BNC

Страница 1: ......

Страница 2: ...USB 1616HS BNC User s Guide Document Revision 1 May 2008 Copyright 2008 Measurement Computing Corporation...

Страница 3: ...aced with same or similar device or refunded at MCC s discretion For specific information please refer to the terms and conditions of sale Harsh Environment Warranty Program Any Measurement Computing...

Страница 4: ...from its use No license is granted by implication or otherwise under any patent or copyrights of Measurement Computing Corporation All rights reserved No part of this publication may be reproduced sto...

Страница 5: ...les main I O connector 12 DSUB37F connector 12 Cabling 13 Field wiring and signal termination accessories 13 Chapter 3 Functional Details 14 USB 1616HS BNC components 14 USB 1616HS BNC block diagram 1...

Страница 6: ...ts 34 Detection setpoint details 38 DAC or timer update latency 38 Chapter 4 Calibrating the USB 1616HS BNC 40 Chapter 5 Specifications 41 Analog input 41 Accuracy 42 Analog outputs 42 Digital input o...

Страница 7: ...e names of manuals and help topic titles and to emphasize a word or phrase For example The InstaCal installation procedure is explained in the Quick Start Guide Never touch the exposed pins or circuit...

Страница 8: ...Hz analog output channels with an output range of 10 V to 10 V 16 high speed lines of digital I O two timer outputs four 32 bit counters The USB 1616HS BNC provides up to 4 MHz scanning on all digital...

Страница 9: ...that the following components are included Hardware USB 1616HS BNC USB cable 2 meter length TR 2U power supply and CA 1 line cord AC to DC conversion power supply and cord plugs into the external powe...

Страница 10: ...let completely before installing any software or hardware Unpacking the USB 1616HS BNC As with any electronic device you should take care while handling to avoid damage from static electricity Before...

Страница 11: ...USB bus while the computer is communicating with the USB 1616HS BNC or you may lose data and or your ability to communicate with the USB 1616HS BNC Configuring the hardware All hardware configuration...

Страница 12: ...Analog common 4 TMR1 Timer output 1 16 bit frequency pulse generator output 5 DGND Digital common 6 TMR0 Timer output 0 16 bit frequency pulse generator output 7 TTLTRG TTL trigger input 8 CTR2 Count...

Страница 13: ...e available on our web site at www mccdaq com cbicatalog cbiproduct asp dept_id 102 pf_id 255 CIO MINI37 VERT 37 pin screw terminal board with vertical 37 pin male D connector Details on this product...

Страница 14: ...USB 1616HS BNC components are shown in Figure 2 and Figure 3 16 BNC connectors for voltage measurement One 37 pin DSUB connector for digital I O counter encoder inputs timer output and analog output...

Страница 15: ...the full 1 MHz A D rate along with digital and counter input channels Each analog channel can have a different gain and counter and digital channels do not need additional scanning bandwidth as long a...

Страница 16: ...han 6 s for this example The scan period can be made much longer than 6 s up to 1 s The maximum scan frequency is one divided by 6 s or 166 666 Hz Figure 5 Analog channel scan of voltage inputs exampl...

Страница 17: ...for every analog sample in a scan group The scan is programmed pre acquisition and is made up of six analog channels Ch0 Ch2 Ch5 Ch11 Ch13 Ch15 and four digital channels 16 bits of digital input thre...

Страница 18: ...cantly may require many samples Thus averaging is suited to low speed applications that can provide many samples Only random noise is reduced or eliminated by averaging Averaging does not reduce or el...

Страница 19: ...nally applied Digital I O Sixteen TTL level digital I O lines are included in each USB 1616HS BNC You can program digital I O in 8 bit groups as either inputs or outputs and scan them in several modes...

Страница 20: ...d hysteresis A note on the hardware analog level trigger and comparator change state When analog input voltage starts near the trigger level and you are performing a rising or falling hardware analog...

Страница 21: ...ects the trigger condition which may be thousands of readings after the actual occurrence of the signal the USB 1616HS BNC driver automatically looks back to the location in memory where the actual tr...

Страница 22: ...art of an analog or digital scan group When reading synchronously all counters are set to zero at the start of an acquisition When reading asynchronously counters may be cleared on each read count up...

Страница 23: ...counter counts up and does not clear on every new sample However it does clear at the start of a new scan command The counter rolls over on the 16 bit counter low boundary or on the 32 bit counter hig...

Страница 24: ...lly associated with electro mechanical devices including relays proximity switches and encoders There are two debounce modes as well as a debounce bypass as shown in Figure 10 In addition the signal f...

Страница 25: ...he output of the debounce module immediately changes state but will not change state again until a period of stability has passed For this reason the mode can be used to detect glitches Figure 12 Debo...

Страница 26: ...with the counter output This can be done by connecting the source to an analog input Use trigger before stable mode when the input signal has groups of glitches and each group is to be counted as one...

Страница 27: ...phase A phase B and index Z signals 1 channel is supported Each input can be debounced from 500 ns to 25 5 ms total of 16 selections to eliminate extraneous noise or switch induced transients Encoder...

Страница 28: ...e Z signal is used to zero a counter that is clocked by A then that counter will give the number of pulses the encoder has rotated from its reference The Z signal is a reference marker for the encoder...

Страница 29: ...o a USB 1616HS BNC module DGND pin 5 CTR0 pin 9 To Encoder A CTR1 pin 27 To Encoder B CTR2 pin 8 To Encoder Z Other DGND pins pins 14 25 28 or 33 can also be used 5VDC pin 23 Figure 18 Connections fro...

Страница 30: ...igure 20 Typical USB 1616HS BNC timer channel Example Timer outputs Timer outputs are programmable square waves The period of the square wave can be as short as 1 s or as long as 65535 s Refer to the...

Страница 31: ...thus allowing real time data analysis during an acquisition The detection module looks at the 16 bit data being returned on a channel and generates another signal for each channel with a setpoint appl...

Страница 32: ...Example diagram of detection signals for channels 1 2 and 3 Each channel in the scan group can have one detection setpoint There can be no more than 16 total setpoints total applied to channels withi...

Страница 33: ...rue only Update on True and False Set values for output 16 bit DAC value or timer value when input meets criteria 16 bit DAC value or timer value when does not meet criteria When using setpoints with...

Страница 34: ...t A and limit B for channel 4 True When Channel 4 s analog input voltage is within the window update DAC1 with the Output Value of 1 0 V False When the above stated condition is False channel 4 analog...

Страница 35: ...e and False with a criteria of inside the window where the signal value is inside the window when simultaneously less than Limit A but greater than Limit B Whenever the channel 15 analog input voltage...

Страница 36: ...n effect until the analog input signal falls below limit B At that time we are again outside the limit low and the update process repeats itself Hysteresis mode can also be done with a timer output in...

Страница 37: ...ly met Detecting setpoints on a totalizing counter In the following figure Channel 1 is a counter in totalize mode Two setpoints define a point of change for Detect 1 as the counter counts upward The...

Страница 38: ...e example the setpoint for analog input Channel 2 s DAC update would occur 5 s after the ADC conversion for Channel 2 or 6 s after the start of the scan When using setpoints to control any of the DAC...

Страница 39: ...eam at the scan rate This data is acquired according to the pre acquisition setup scan group scan period etc and returned to the PC Counters are latched into the acquisition stream at the beginning of...

Страница 40: ...tion and the other which is available for field calibration You can perform field calibration automatically in seconds with InstaCal and without the use of external hardware or instruments Field calib...

Страница 41: ...quisition data buffer 1 MSample Configuration memory Programmable I O Maximum usable input voltage common mode voltage CMV Vin Range 10 V 5 V 2 V 1 V 0 5 V 10 5 V maximum Range 0 2 V 0 1 V 2 1 V maxim...

Страница 42: ...MHz typical differential short Analog outputs Analog output channels can be updated synchronously relative to scanned inputs and clocked from either an internal onboard clock or an external clock sou...

Страница 43: ...modes See Table 7 Digital output trigger sources Start of input scan Sampling update rate 4 MHz maximum rates up to 12 MHz are sustainable on some platforms Pattern generation output Both 8 bit ports...

Страница 44: ...Analog 1 0 MHz Digital 4 MHz if no analog channels are enabled 1 MHz with analog channels enabled Clock signal range Logical zero 0 V to 0 8 V Logical one 2 4 V to 5 0 V Minimum pulse width 50 ns hig...

Страница 45: ...n period maximum Digital pattern triggering 8 bit or 16 bit pattern triggering on any of the digital ports Programmable for trigger on equal not equal above or below a value Individual bits can be mas...

Страница 46: ...nge 40 C to 80 C Relative humidity 0 to 95 non condensing Mechanical Table 13 Mechanical specifications Vibration MIL STD 810E category 1 and 10 Dimensions 280 mm W x 216 mm D x 45 mm H 11 0 x 8 5 x 1...

Страница 47: ...4 DGND Digital common 15 Port A A0 Digital I O digital port A bit 0 16 Port A A2 Digital I O digital port A bit 2 17 Port A A4 Digital I O digital port A bit 4 18 Port A A6 Digital I O digital port A...

Страница 48: ...requency Common Mode immunity Criteria B IEC 61000 4 11 1994 Voltage Dips Interruption immunity Criteria B To maintain the safety emission and immunity standards of this declaration the following cond...

Страница 49: ...Measurement Computing Corporation 10 Commerce Way Suite 1008 Norton Massachusetts 02766 508 946 5100 Fax 508 946 9500 E mail info mccdaq com www mccdaq com...

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