Innovative Source / Measure Units for Dynamic Measurements For The N6705/N6700 DC Power Mainframes Carlo Canziani System Product Division EMEA Business Development Carlo Canziani Advanced Power Solutions EMEA Business Development Innovative Source/Measure Units For The rev. Jan 2013
Agilent Solution Flexible: Modular Mainframes N6705B DC Power Analyzer Mainframe, 600W Designed for the R&D Bench N6705 DC Power Analyzer Mainframe N6700 Low-Profile Modular Power Supply N6700B Low-Profile MPS Mainframe, 400W N6701A Low Profile MPS Mainframe, 600W N6702A Low Profile MPS Mainframe, 1200W Designed for Mfg Functional Test (Small, Flexible and Fast) 2 rev. Jan 2013
Form Factors for Bench and Automated Testing DC Power Analyzer + Companion Software Modular for flexibility Superior Usability for investigative experimentation by R&D engineers Low-Profile Mainframe for ATE Modular for flexibility Excellent for high speed automated test Small size for high point count systems Almost same functionalities, need custom SW 3 rev. Jan 2013
The N6705B DC Power Analyzer Boosts the productivity of the R&D Engineer Integrates multiple instrument functions into a single box 1 to 4 advanced power supplies; >34 different models available Digital voltmeter and ammeter Arbitrary waveform generator Oscilloscope Data Logger All functions and measurements are available from the front panel Gain insights into your DUT's power consumption in minutes, not hours without writing a single line of code! 4 rev. Jan 2013
Agilent N6705 Sourcing Capabilities (V and I) V V V V V Output sequencing Output waveforms V DC bias Pulse t Module 1 Module 2 Module 3 Module 4 t V OUTPUT ON t Step turnon Trapezoid Delay 2 Delay 3 Delay 4 t t Ramp turnon V Dropout t V t Staircase turn-on t AC + DC offset V1 V2 V3 t Exponential turn-on V t User defined V4 6 rev. Jan 2013
Agilent N6705 Measurement Capabilities Meter View Scope View All can be controlled from front panel w/o prog. DC measurements on all 4 outputs Data Logger Voltage and/or current waveform capture Actual screenshots Log data for seconds, hours, days even weeks 7 rev. Jan 2013
18 bits res. multiple ranges dual digitizers 16 bits res. dual range dual digitizers 14 bits res. autorange single digitizer 14 bits res. Flexible: Mix and Match Power Modules (34) 50 W DC Power Modules (6 models up to 100 V or 10 A) 100 W DC Power Modules (6 models up to 100 V or 20 A) 300 W DC Power Modules (5 models up to 150 V or 15 A) For basic DUT or fixture power (models N6730 N6740 N6770) 50 W / 100 W / 300 W / 500W High-Performance, Autoranging DC Power Module For applications where power supply plays key role as source and measurement instrument (models N675xA) 50 W / 100 W / 300 W / 500W Precision Autoranging DC Power Module For semiconductor testing and applications requiring precision in the milli- and microampere region (models N676xA) 20 W 2-Quadrant Source Measurement DC Power Module 20 W 4-Quadrant Source Measurement DC Power Module For semiconductor testing and applications requiring precision in the milli- and microampere region (models N6781A N6782A N6784A) 8 rev. Jan 2013
Enabling Solutions for Battery Drain and Power Device Functional Test N6781A MP3 players N6782A Power Amplifiers DUT Wireless Peripherals GPS Power management circuits (PMIC/PMU) Mobile phones Wireless sensor e-meter DC/DC Converters Chipset Application Battery-Powered Device Test Battery Drain Analysis Battery/Charger Emulation Determining performance of DC powered device during DC input transients Loading down output stage of DC power management circuits Needs Stable output voltage like a battery Accurately measure dynamic current waveforms Measure the run-time of a battery (rundown) Stimulate and load down DUT Quickly modulate output voltage or current High-speed, accurate data acquisition rev. Jan 2013
New N6700 SMU Modules Summary PRODUCT APPLICATION FEATURES N6781A 2-Quadrant SMU for Battery Drain Analysis 20V +1A / 6V +3A, 20W N6782A 2-Quadrant SMU for Functional Test 20V +1A / 6V +3A, 20W N6784A 4-Quadrant SMU for General Purpose +20V +1A / +6V +3A, 20W Battery drain logging & analysis Battery run-down logging & analysis Chip set test PMU test Active device test Semiconductor test Discrete device test Passive device test Battery emulation Auxiliary DVM input Seamless measurement ranging Fast load response Fast ARB generator Hi-speed digitizing Mult. meas. ranges Additional sourcing ranges N6705B DC Power Analyzer Mainframe 14585A Control and Analysis Software Supports new apps Battery run-down Semiconductor test >20 A load apps Enhances N6705B: Battery drain testing All kinds of functional testing Supports new models DVM connector port Lower leakage current Heavy wire rear exits Enhances N6705B: Statistics Add l waveform gen. Control 4 N6705B Much, much more 10 rev. Jan 2013
Agilent s 2-Quadrant SMU Modules Voltage Source Current Source Electronic Load Glitch free sourcing and measurement Multiple measurement ranges Excellent transient response to GSM pulse Stable with capacitive loads up to 150 µf Auxiliary voltage measurement input for battery rundown test (N6781A) All In One Programmable Output Resistance (N6781A) Load -1A +6V -3A Source +20V +1A +6V +3A Measurement Built-in digitizer of 200,000 samples/second N6781A for Battery Drain Analysis N6782A for Functional Test Addressing Emerging Needs in Battery Drain and Functional Test 11 rev. Jan 2013
N6781/2A Usability Enhanced via Front Panel Modes -1A +20V +1A -3A +6V +3A N6781A, N6782A 2-Quadrant Source Capabilities To simplify using the new BDA module, select one of the modes below Keeps operation in quadrant and behavior that is best fit for the application V V V V I I I I Standard DC Supply Battery Emulator with programmable Rout Battery Charger CC or CV Load (Electronic Load) 12 rev. Jan 2013
N678xA Fast Voltage Transient Response Performance 50µs/div 10µs/div 8x better 500mV/div 100mV/div N6762A providing ~500 mv transient drop New N6781A providing ~60 mv transient drop Mobile digital wireless devices draw current in fast pulses Requires a stable voltage with minimum transient voltage drop The N678xA SMUs provide about 8X or better performance over GP DC sources The same transient response is achieve regardless of seamless ranging operation! Key Tip!: Correct remote sense wiring, bandwidth compensation setting and load capacitance must all be considered for optimum performance Key Tip!: OSC and/or OV protect at output enable usually incorrect set up 13 rev. Jan 2013
Basics to get SMU Specified performances Poor connections dramatically impact specified performances. Always follows recommendations to connect your device and select the Output Voltage BW 14 rev. Jan 2013
Agilent N6781A & N6782A Accuracy and Seamless Ranging Range 20 V 6 V 1 V 100 mv Programming Accuracy Measurement Accuracy ±(0.025% + 1.8 mv) ±(0.025% + 600 µv) ±(0.025% + 1.2 mv) ±(0.025% + 75 µv) ±(0.025% + 50 µv) Range 3 A 1 A 300 ma 100 ma 1 ma 10 µa Programming Accuracy Measurement Accuracy Voltage Seamless measurement between these 3 ranges Current ±(0.04%+ 300µA) ±(0.04%+300µA) ±(0.03%+150µA) ±(0.03% + 250 µa) ±(0.025% + 10µA) ±(0.025% + 100 na) ±(0.025% + 8 na) Seamless measurement between these 3 ranges Seamless ranging continually changes ranges without glitch and does not lose readings 200 khz, 18-bit digitizer, with seamless ranging, acts likes single range of ~28-bits Allows for accurate measurements from Amps to µa during a single scope sweep or data log (1,000,000:1) Independent Source and Measurement ranges 15 rev. Jan 2013
Agilent s Seamless Ranging Resolves Shortcomings of Conventional Auto-ranging Technology For Application Conventional auto-ranging is not suitable for pulsed battery drain current signals: Conventional DMMs are not able to return desired readings when set to auto-ranging: Takes 10 s to 100 s of ms to range change for valid value. Signal level changes in meantime. Conventional Source-Measure Units output current is also limited by measurement range: Output Voltage 1V/Div 200 µs/div Takes 10 s to 100 s of ms to range change for valid value. Signal level changes in meantime. Constantly current limiting with load pulse with subsequent voltage drop-outs and overshoots Seamless Ranging is optimized for application: Measurement is never over-ranged providing a uninterrupted stream of valid readings As an SMU, measurement and sourcing are totally decoupled assuring glitchless output performance Load Current 500 ma/div Conventional SMU Set to Auto-ranging Measurement Powering a Pulsed Load (Voltage Drops Out Under Load) 16 rev. Jan 2013
Seamless Range Changes Amperes Seamless Dynamic Current Measurement 200 khz, 18-bit digitizer acts likes single range of ~28-bits Range Measurement Accuracy = Seamless range change 3 A ±(0.03% + 250 A) Activity 100 ma ±(0.025% + 10 A) Idle 1 ma ±(0.025% + 100 na) Sleep 10 µa ±(0.025% + 8 na) FIXED RANGE 17 rev. Jan 2013
Seamless Current Measurement All new, Agilent-exclusive feature never been done before Can change range, without glitch, mid-sweep and not lose any readings 200 khz, 18-bit digitizer acts likes single range of ~28-bits Yesterday Today Seamless Off Seamless On See the complete current waveform you ve never seen before from na to A in one pass and one picture 18 rev. Jan 2013
N6781A/2A Measure Only Mode Zero Burden Ammeter Module uses its power output to regulate zero volts across itself while measuring current (in either direction of flow) Single reading, scope, or data log N6781A Aux DVM input measures battery voltage Gives most realistic assessment of DUT operation with actual battery DUT Battery + + Battery Current Drain 0 Volts Ammeter + _ Up to 4 per mainframe DUT N6781A Aux In Voltage Measurement 19 rev. Jan 2013
Agilent N6781A SMU Measure-only Operating Mode Actual Battery Run-down Test Example Battery run-down for a GSM/GPRS handset logged with an N6781A SMU & 14585A SW Voltage Current Power Results Logged min, avg & max volts, amps, & watts Markers at start and shutdown determine: I avg = 233 ma V avg voltage = 3.82 V Charge = 843 ma-h Energy = 3.19 W-h Run time = 3 hr 38 min V shutdown = 3.44 V Insights: Delivered charge (843 ma-h) less than spec d (1000 ma-h) V shutdown high (target 3V) Often energy (unspec d) is more related to actual run-time than Charge (spec d) 20 rev. Jan 2013
PMU/PMICs Sub Circuits Current Drain Measurements V 1 DUT Sub-circuit 1 Mixed Signal Oscilloscope serial bus DUT current + - PMU V 2 V n... Sub-circuit 2 Sub-circuit n Trigger N.C. V out + V out - V out - V out + 0 Volts Aux in DVM Battery emulator N6781/82A SMU #1 N6705B DC Power Analyzer Aux in DVM A Zero burden ammeter N6781A SMU #2 Optimize Your Mobile Device s Subcircuits for Battery Run Time A. N. p/n 5990-9268EN Note that SMU#2 SMU#n are not providing e-loads. DUT circuits are the loads. SMUs accurately measure load current with zero-burden ammeter 21 rev. Jan 2013
14585A Control and Analysis Software Compliments N6705B by enhancing & adding capabilities through a PC graphical user interface: Simultaneously control & display up to 4 N6705Bs / 16 outputs Large PC monitor greatly enhances viewing details Data log direct to PC hard drive, limited only be available space Doubles scope mode memory space (512 K vs. 256 K) Enables battery drain analysis testing (battery run-down, statistics) Adds statistics capabilities (histogram & CCDF) with direct logging for N6781A BDA SMU module only and data logging conversion for others Adds more ARB waveform generation capabilities; new pre-configured waveforms, formula-based generation, record and playback Formula-based traces available enable re-scaling and unit conversion Works with new and existing 34 modules; useful for a lot more than just Battery Drain Analysis Some limiting considerations Scope Mode Data Log Mode External app; limits data-logging maximum speed (10 ks/s vs. 50 ks/s for the N6705B mainframe directly) Statistics Mode 22 rev. Jan 2013
14585A Enhanced analysis CCDF 23 rev. Jan 2013
Using CCDF Profiles to Analyze Improvements in Power Savings, Standby Current Drain Analysis Example 2.4 ma 14.3 ma Discontinuous RX 3.0% 0.16% Continuous RX Comparing CCDF profiles of standby current drain: continuous RX vs. discontinuous RX Complementary Cumulative Distribution Function (CCDF) curves provide critical information about the signals encountered in 3G systems. These curves also provide the peak-to-average power data needed by component designers. A (vertical) change of 2.8% of RX activity at 128 ma contributed 18% of the power savings A (horizontal) change of 11.9 ma of the idle current activity (~ 90%) contributed 55% of the power savings The remainder of the power savings is from reduced baseband activity The more random the signal is the more helpful it is to have alternate ways to analyze results 24 rev. Jan 2013
N678xA ARB Capabilities and 14585A ARB Enhancements N678xA ARB sets a new level of performance for family Voltage programming 3 db small signal BW: 9kHz to 60 khz Depends on Output Voltage BW setting and capacitive loading Current programming 3 db small signal BW: 120 khz Time resolution 5.12 µs 14585A ARB features enhanced over N6705B 14 built-in ARBs (vs. 7 in N6705) Choice of 512-point Variable Dwell or 64K-point Constant Dwell (CD) for built-in ARBs. CD ARBs provide greater resolution on continuously varying signals (no CD built-in ARBs in N6705) Formula-based ARBs w/ 28 built-in functions Import and modify (offset, period, crop, clip, & mirror) waveform files Can sequence 64K-point CD ARBs Auto decimation of ARBs when sequenced to fit into 64Kpoint or 512-point file structure 25 rev. Jan 2013
14585A Waveform Generator V / I Source and Sink From Canned Waveform Run Generator Window Run the Arbitrary waveform Sine, Triangle, Saw Tooth, Exponential, Stair Step, Square, Gaussian, Sinc, Random noise Export / Save From Formula 15 primitive function: abs(),acos(),log(), etc 12 high level functions: AM,PWM, gauss(), etc 6 operators: +,-,*,/,^,% From Memory Data copied from Clipboard Add/Insert/Delete waveforms Run/Stop waveform Edit data by sheet Pan and Zoom in /out Change time scale/offset Change vertical scale/offset Auto scale Show/change parameter of waveform Show/change trigger settings Tabbed/CSV/XML text files Binary format files Clipboard: Bitmap Image Clipboard: paste data Print One page summary 26 rev. Jan 2013
14585A Record and Playback Record Playback Capture data with N6705 scope or data logger Data Reduction and Sample Rate Conversion Run the Arbitrary waveform Capture from a different instrument: NI TDM, LabVIEW Binary, Tektronix Binary, Agilent Scope Binary Export data to Excel Import from file: XML,Text-CSV, MATLAB, Audio Before Import tabular data from Clipboard After Export data to Clipboard as a Bitmap or tabular data Export data to file: Tabbed/CSV/XML text files 27 rev. Jan 2013
Recording and Playing Back a Load Waveform Useful for customers: Test capacity of their battery under real world loading Test capability of their PMICs under real world loading Eliminates complexity of setting up an actual DUT Easily allows large scaling of testing without large numbers of DUTs The N6705B can playback up to 64,000 waveform points: use a sampling rate high enough to preserve dynamic characteristics! 64K-points and fast sampling rates provide only short playback time. Can playback the waveform file repetitively for extending playback time 28 rev. Jan 2013
Maximum Digitizing Rate Performance Summary N6705B with N6781A 14585A SW with N6705B & N6781A Scope Capture Data Logging CCDF Histo-gram Logging 256 ksamples (5.12 µs * # of traces) sample interval 1 Can capture 1.31 sec @ max rate (20.48 µs * # of traces) integration period 2 (50k / # of traces) points/sec 5.12 µs underlying sample interval Can capture ~2h50m @ max rate w/ 1.9 Gbyte internal file max Not Available 512 ksamples (5.12 µs * # of traces) sample interval 1 Can capture 2.62 sec @ max rate (102.4 µs * # of traces) integration period 2 (10k / # of traces) points/sec 5.12 µs underlying sample interval Writes to PC hard drive. Capture time limited only by available space 20.48 µs sample interval Up to 1K hrs @ any rate Notes: 1. The sample interval time is proportional to number of measurement traces selected. Power traces are calculated so they do not increase sample interval time. 2. The integration period is effectively the sample interval for data logging, with the 5.12 µs the underlying rate of sampling that gets averaged into the integration period. Likewise, the integration period is proportional to the number of measurement traces selected excluding power traces which are calculated. 29 rev. Jan 2013
Seamless Measurement Demo Datalogging Demo 35 rev. Jan 2013
Wireless Battery Powered Devices: Summary Optimizing battery life on wireless devices is a top priority Wireless devices operate in short bursts of activity to conserve power Applicable to a very wide variety of devices Resulting current drain is pulsed The high peak and low average values of current drain signals are challenging for traditional test equipment to measure accurately: Dictates needing DC measurement offset errors < µa Traditional test equipment offset error ma is too high! Innovation in the form of seamless ranging resolves the inherent problem of DC measurement offset error for accurately measuring dynamic current drain. www.agilent.com/find/n6781a-eu 37 rev. Jan 2013
DC-DC CONVERTER TESTING 39 rev. Jan 2013
DC Power Components DC-DC Converters Electronic systems need constant supply V Mobile wireless devices don t have a constant V power source (batteries run down) Converters/regulators produce ~ constant V output as input V varies and/or as output I varies Typical inductive switching converter config Diagrams courtesy of Texas Instruments 40 rev. Jan 2013
DC Power Components DC-DC Converters Typical DV Measurements Power efficiency vs. load current vs. input voltage Transient response Output V & I vs. Input V (line regulation) Output V vs. Output I (load regulation) Start-up and shut-down times (impacts how quickly a circuit can be turned on/off which affects battery life) Output V rise times Turn-on time V Vin Vout Efficiency vs. Iout vs. Vin Turn-on time Vout rise time 41 rev. Jan 2013
N678x SMUs Arb + A V DUT V A E-Load Arb SMU #1 = source SMU #2 = load Basic DC Stimulus/Response Measurements Source and sink Integrated V and I measurements vs. collection of instruments Better accuracy and faster measurement than equivalent collection of separate instruments +6V -3A -1A +20V +1A N6781A/82A +6V +3A Greater Capabilities for Wireless Applications ~20W Seamless measurement ranging to accurately capture dynamic loads or pulsed currents Arb capability on source and load Current measurement down to µa/na 42 rev. Jan 2013
DC Power Components PMICs & PMUs PMIC and PMU Measurements Multiple outputs or power rails Efficiency, turn-on/off times, rise/response times Outputs with variable controlled output V Efficiency, response times at each output V level & V level change Load and line regulation for each output Load regulation of each output relative to load changes on other outputs Leakage or quiescent current with outputs off Sequence pulsed loads Multiple outputs multiple measurements multiple SMU modules SMU #2 SMU #1 PMU SMU #3 SMU #4 SMUs are loads on PMU... SMU #n rev. Jan 2013
DC-DC converter / LDO Complete efficiency measurement Efficiency test output current sweeps with I=t 3 profile Formula trace directly provide power efficiency results in % (pink trace) 44 rev. Jan 2013
DC-DC converter / LDO Complete measurements in few ms (Start-up time) Start up time 45 rev. Jan 2013
How does the DC Power Analyzer compare to the alternatives for testing DC/DC converters and PMUs? Data Logger / DMM N6705B DC Power Analyzer Scope ARB 4 Power Supplies To get the job done still requires cabling, transducers, integration, programming Works out of the box Fully integrated No programming required 46 rev. Jan 2013
New Videos on DC-DC Converter testing Testing a DC to DC Converter Simplified Using an N6705B DC Power Analyzer with a N6781A SMU http://youtu.be/lwwajhrldiw DC to DC Converter Efficiency Measurements, Using an N6705B with two N6781A SMUs http://youtu.be/bt-ganfxzry 47 rev. Jan 2013
DOCUMENTS 51 rev. Jan 2013
NEW Application notes 10 Tips to Optimize a Mobile Device s Battery Life http://bit.ly/mqk4av Enhance the Battery Life of Your Mobile or Wireless Device http://bit.ly/xxir0e 52 rev. Jan 2013
Available resources SMU 2Q modules information www.agilent.com/find/n6781a-eu SMU 4Q module information www.agilent.com/find/n6784 SW download and installation instructions www.agilent.com/find/14585 look videos on www.youtube.com/agilenttube Agilent Watt s Up Blog entirely focused on power products at http://powersupplyblog.tm.agilent.com/. Here you can find information related to power product needs plus tips and more. Specification Guide User manual http://cp.literature.agilent.com/litweb/pdf/n6700-90001.pdf N6705/N6700 Programmer Reference: link Carlo Canziani Agilent Technologies System Product Division Business Development Manager ph +39 02 9260 8689 carlo_canziani@agilent.com 53 rev. Jan 2013
Q and A Session 54 rev. Jan 2013
BACKUP SLIDES 55 rev. Jan 2013
Agilent N6705A DC Power Analyzer Measure/Source control Keypad/menu entry/control Output select, V & I set knobs Emergency stop: All outputs off USB memory stick connector LCD display: Metering Scope Datalogger Menu AC line switch Display control knobs: V, I, & Time / division Offsets for each Markers Trigger level 4 power supply outputs, each with: +/- Output +/- Sense Output On/Off 56 rev. Jan 2013
Key Differences N6705B vs N6700B Features N6705B N6700B Full front panel GUI (Scope, DL, AWG) Web interface Measurement accuracy Module dependent Module dependent Internal Datalogger External Datalogger ELOG- (a) Real time clock Internal memory Requires programming and opt 054 on module State memory only USB Memory Arbitrary Waveform Generator (a) LIST mode, 512 Sequence, opt 054 on module w programming Scope (a) Control and analysis SW 14585A Emergency Stop button Requires programming and opt 054 on module Option 054 enable High Speed Test Extension on basic N673/4/7/5 and autorange performance modules N675x. Option 054 is standard on precision modules N676x and SMUs N678x. Option is NOT required when modules are used in N6705B 66 rev. Jan 2013
ATE ACCURACY AND SPEED 73 rev. Jan 2013
N6781/2A Measurement speed the new choice for Ultra Low Current Drain Fast measurements on ultra low currents Fast measurements on dynamic signals Gated measurements Externally triggered measurements Speed example: Total Measurement Time with a Current Step Down Transition Current Step Transition : Total Measurement Time= 8 msec (1 ma range) Analog level triggered measurements 5 µs sampling rate 45 µs measurement settling time 1 ms command processing time Note: N6700 mainframes provide similar capabilities to N6705 but NO Internal Datalogger 74 rev. Jan 2013
Application notes Comparing the N6700 Low-Profile and DC Power Analyzer Mainframes http://cp.literature.agilent.com/litweb/pdf/5989-7745en.pdf How to use the Agilent N6700 Series Modular Power System to replace an Agilent 662xA http://cp.literature.agilent.com/litweb/pdf/5989-0466en.pdf 75 rev. Jan 2013
Signal Generation Examples LOAD AND DROPOUT SIMULATION 76 rev. Jan 2013
N6781A Pulsed Current Sinking Example used as Electronic load N678xA SMU use as pulsed electronic load Measurements performed on a scope using a current probe 77 rev. Jan 2013
N6781A Dropout Capability Example (resistive load) 5V 100µs dropout 20µs/div 1V / div 78 rev. Jan 2013
DATALOGGER 86 rev. Jan 2013
Fundamental Sample Rate of N6700 Modules When measurements are taken in Scope Mode or via SCPI commands Module(s) N6781A, 82A, or 84A N6781A, 82A, 84A, N6761A or 62A* 2 of any N6700 module 2 or more of any N6700 module Conditions 1 parameter = voltage or current* When measuring only 1 parameter from only 1 module When measuring 2 parameters from only 1 module When measuring 1 parameter from each module (2 parameters total) When measuring 3 or more parameters from any combination of modules Resulting Rate 200K samples/second (1 sample/ 5.12μs) 100K samples/second (1 sample/ 10.24μs) 100K samples/second (1 sample/ 10.24μs) 50K samples/second (1 sample/ 20.48μs) If the desired measurement window is greater than the buffer size multiplied by the sample rate, then the sample rate will increase accordingly The buffer size is divided by the total number of parameters being measured across all modules in a mainframe The buffer size can be set to between 1k and 256k (512k when using SCPI) Page 87
Vmeas Imeas Vmeas Imeas Data Logger Standard / Interleaved Mode Occurs on ALL modules when any Basic or Hi-Performance module is set up to measure BOTH V and I Sample Period n Min = 75 ms Max = 60 s Sample Period n+1 Sample Period n+2 250 samples at 50 khz = 5.12 ms integration 250 samples at 50 khz = 5.12 ms integration wait the remainder of the period wait Always 50 khz sample rate when in Interleaved Mode Each measurement is an integrated (averaged) V or I reading Allows one A/D to measure V and I just interleaved Gaps in data just like a standard data logger Page 88
Data Logger Continuously Sampled Mode Occurs on ALL modules when measuring only V or I. Always in this mode if only Precision or SMU modules are installed. Sample Period n Min = 20 μs Max = 60 s Sample Period n+1 Sample Period n+2 Avg Min Max Avg Min Max Sample Rate: 200kHz for SMUs 50 khz for all other modules Captures Average = integrated measurements over the sample period Optionally stores min/max for each sample period No gaps in data; never misses a sample point
Sample Interval in Continuously Sampled Mode Minimum Sample Interval 20.48 μs, which is one reading at 50 khz sample rate Module type Use one module of any type Conditions Can measure 1 parameter (voltage or current) from one module. No or max or power measurement. Each additional parameter (voltage, current, power, min, max) to be measured adds 20.48 microseconds to the sample period. Examples of minimum sample period: Data log current from 1 module = 20.48 μs Data log voltage and current from 1 module = 40.96 μs Data log current from 2 modules = 40.96 μs Data log current from 4 modules = 81.92 μs Data log voltage and current from 4 modules = 163.84 μs 90
Data Logger Mode is determined by the settings of the Basic and Hi-Performance Modules Modules that can only measure V or I, but not both at the same time Model #s N673xB, N674xB, N677xA are Basic modules with 1 A/D Model #s N675xA are Hi-Performance modules with 1 A/D Model #s N6783A are Application-Specific modules with 1 A/D Since there is only 1 A/D to measure BOTH V and I, the Data Logger must be in Standard/Interleaved mode. Modules that can measure V and I at the same time Model #s N676xA are Precision modules with 2 A/Ds Model #s N6781A, N6782A, and N6784A are SMU modules with 2 A/Ds With 2 A/D s, the Precision modules and SMUs can measure BOTH V and I, even when in Continuously Sampled mode.