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EX1200-1538: SFP Operation



Impedance

: The input impedance for the channel. Default value is 195,000 ohms.



Level

: Sets the threshold level for an analog channel.



Hysteresis

: Sets the hysteresis level for an analog channel.



Lower Limit

: Sets the low frequency limit for measurement. Programmable from 0.05 to

1,000,000 (Hz). Not, the

Lower Limit

should be less than the

Upper Limit

. Not available for

Totalize

EdgeCount

, or

Quadrature

functions.



Upper Limit

: Sets the high frequency limit for measurements. 0.05 to 1,000,000 (Hz). Not

available for

Totalize

EdgeCount

, or

Quadrature

functions



Polarity

: Indicates whether the input signal will remain

Normal

(default) or if it will be

Inverted



Input Type

: Sets the channel as a

Digital

Analog

mode.



Slope

: Sets the channel for measurement on a

Positive

Negative

slope.



Ref Channel

: Sets the channel that the currently configured channel is referenced against

when a comparative measurement is taken. Only available for the

Phase

and

Quadrature

functions.



Index Channel

: Indicates the index channel that will be used during a measurement

comparison. Only available for

Quadrature

measurements.



Preset Count

: Sets the start value for counting functions. Only available for

Totalize

EdgeCount

, or

Quadrature

functions



Overflow Mode

: Determines how a channel handles data if the count exceeds the maximum.

Only available for

Totalize

EdgeCount

, or

Quadrature

functions

Stop

: When an overflow occurs, the instrument stops counting and returns an invalid

value (NaN) as a result.

Preset

: When an overflow occurs, the instrument counter rolls over and begins counting

from the defined

Preset Count

Wraparound

(default): When an overflow occurs, the instruments counter rolls over and

begins counting from 0.



Averaging Mode

: Sets the channel to a specified averaging methodology. The user can select

from

Aperture Time

Average Count

. Not available for

Totalize

EdgeCount

, or

Quadrature

functions



Aperture Time

: Sets the duration over which the EX1200-1538 will make a measurement.

Not available for

Totalize

EdgeCount

, or

Quadrature

functions. Also not available when

Average Count

is selected for

Averaging Mode



Average Count

: Sets the number of function events (i.e. periods, pulse widths, etc.) that will

be counted and averaged before a value is returned.



Average Repeat

: When

Average Count

is selected, the

Average Count

checkbox can be

selected. When selected, the EX1200-1538 average of consecutive, non-overlapping samples.



Tooth Count

: Indicates the nominal number of teeth on a toothed-wheel. Only available for

Rpm

measurements.



Tooth State

: Indicates whether the toothed-wheel has an

Extra

Missing

toothed-wheel as

a point of reference. This allows for measurement compensation. The default for this
parameter is

Normal

. Only available for

Rpm

measurements.

To begin a counter measurement, click on the

Monitor

button at the top of the

Counter

page.

Once a measurement is initiated, the

LED Panel

will populate with the measurement values and

indicate the type of measurement that was made on each channel, as shown in Figure 6-5. The

Monitor Page

is discussed in more detail below.

IGURE

6-5:

LED

ISPLAY AFTER

EASUREMENT

NITIATION

Содержание VTI Instruments EX1200-1538

Страница 1: ...EX1200 1538 MULTIFUNCTION COUNTER TIMER USER S MANUAL P N 82 0127 007 Released February 10 2020 VTI Instruments Corp 2031 Main Street Irvine CA 92614 6509 949 955 1894...

Страница 2: ...uty Cycle Measurement 14 Time Interval Measurement Accuracy Using Analog and Digital Inputs 14 SECTION 2 15 USING THE INSTRUMENT 15 Unpacking 15 Determine System Power Requirements 15 Plug in Module I...

Страница 3: ...Function 39 Edge Counting Function 42 Frequency Function 42 RPM Function 45 Time Interval Function 48 Phase Difference Function 51 Quadrature Encoder Function 51 Digital I O Function 54 Analog Output...

Страница 4: ...warrant that the operation of the product or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The warranty shall not apply to defects resulting from improper or inadequa...

Страница 5: ...ition could possibly cause damage to equipment or loss of data These symbols may appear on the product ATTENTION Important safety instructions Frame or chassis ground Indicates that the product was ma...

Страница 6: ...d electric shock the grounding conductor must be connected to earth ground Operating Conditions To avoid injury electric shock or fire hazard Do not operate in wet or damp conditions Do not operate in...

Страница 7: ...Warner Road Suite 13 Valley View OH 44125 Phone 216 447 8950 Fax 216 447 8951 VTI Instruments Lake Stevens Instrument Division 3216 Wetmore Avenue Suite 1 Everett WA 98201 Phone 949 955 1894 Fax 949...

Страница 8: ...VTI Instruments Corp 8 EX1200 1538 Preface...

Страница 9: ...a acquisition applications The electronic counter utilizes a high stability 1 ppm 50 MHz TCXO base clock oscillator along with a reciprocal counting method to achieve a wide frequency measurement rang...

Страница 10: ...asis Each channel is isolated from the other and accepts voltages between 2 5V and 60 V The output channels use solid state switches that work in any polarity Setting the output logic levels and readi...

Страница 11: ...CK 50 MHz TCXO TIME BASE CLOCK STABILITY 1 ppm COUNTER TYPE 32 bit reciprocal counting type MAXIMUM TOTALIZE TICK COUNT 232 MINIMUM DETECTABLE PULSE Digital channels Analog channels 50 ns 600 ns RPM M...

Страница 12: ...ltage current conversion PROTECTION Open and short circuit for continuous duration of time ACCESSORIES MATING CONNECTOR NO CRIMP Description VTI part number Manufacturer part number 104 pin HD D sub m...

Страница 13: ...29 0 0034 6 Period Measurement Using Digital Input Where Perror Absolute period measurement error in s Ferror Absolute frequency error in measurement in Hz Fin Input frequency in Hz Period Measurement...

Страница 14: ...ions Time Interval Measurement Accuracy Using Analog and Digital Inputs Refer to the Pulse Width Measurement Accuracy Using Digital and Analog Inputs calculations Addition of 1 48 x 10 7 s offset to t...

Страница 15: ...The user should confirm that the power budget for the system for the chassis and all modules installed therein is not exceeded on any voltage line It should be noted that if the mainframe cannot provi...

Страница 16: ...GND 65 UNUSED 86 GND 3 CH3_P 24 CH3_N 45 GND 66 GND 87 GND 4 CH4_P 25 CH4_N 46 GND 67 UNUSED 88 GND 5 CH5_P 26 CH5_N 47 GND 68 UNUSED 89 GND 6 CH6_P 27 CH6_N 48 GND 69 QUAD_INDEX2 90 GND 7 CH7_P 28 C...

Страница 17: ...nalog input differential channels P Positive N Negative AOUT_CHx_ Analog output channels P Positive N Negative AGND_DACx Isolated GND for analog output DIGI_SEx Digital single ended channels QUAD _IND...

Страница 18: ...3 T77 QUAD_INDEX3 71 T107 UNUSED UNUSED T18 CH6_P 6 T48 DIO4 34 T78 GND 98 T108 UNUSED UNUSED T19 CH7_N 28 T49 DIO5 14 T79 QUAD_INDEX4 92 T109 UNUSED UNUSED T20 CH7_P 7 T50 DIO5 35 T80 GND 100 T110 UN...

Страница 19: ...moved for clarity FIGURE 2 3 TERMINAL BLOCK INSTALLATION INTO THE EX1200 TBR CALIBRATION Every EX1200 1538 is factory calibrated using NIST traceable standards Optionally the EX1200 1538 can be return...

Страница 20: ...VTI Instruments Corp 20 EX1200 1538 Using the Instrument...

Страница 21: ...ter Logic BPL_TRIG Module Front panel Module Backplane MUX DMM_Bus Index Z pulses of quadrature encoder GND DIN_Ch_x Hysteresis level DAC Coupling selection AC DC Normal Active High Inverted Active Lo...

Страница 22: ...fferential voltage waveforms up to 48 V maximum Analog input lines must be connected to the device under test DUT as detailed in Figure 3 3 Analog Input Channel Shielded Twisted Pair Channel GND AIN_C...

Страница 23: ...rogrammed in 1 mV steps over the entire voltage input range These values should not exceed the minimum and maximum voltage limits of the input range 48 V VTHRESHOLD VHYSTERESIS 48 V When setting the l...

Страница 24: ...with a width greater than 20 ns can be counted Input Logic Pattern Count Value 1 2 3 4 5 6 7 232 1 0 FIGURE 3 7 TOTALIZE FUNCTION Typically counting begins from zero 0 and can continue up to 4 294 967...

Страница 25: ...can be measured using the EX1200 1538 counter The data acquired from period measurements are the result of using one of two different averaging modes Aperture Time mode and Average Count mode Apertur...

Страница 26: ...Average Repeat is set to true then every three consecutive cycles will be averaged When set to False the EX1200 1538 uses consecutive overlapping cycles to calculate the period When Average Repeat is...

Страница 27: ...measured simultaneously However by using two separate channels one for measuring positive cycle width and other one for measuring low cycle width this limitation can be surmounted As a derivative of...

Страница 28: ...ameters including averaging modes for period measurements apply to duty cycle measurements as well Frequency Measurement As the inverse of the Period function the EX1200 1538 can also make Frequency f...

Страница 29: ...rotational velocity of a toothed wheel sensor This function measures the tooth to tooth period similar to Frequency mode and converts it into units of revolutions per minute RPM In line with frequency...

Страница 30: ...t channel as the reference channel If the input signal is not present or if the input signal does not crosses the configured threshold limit the measurement will be waiting continuously for the signal...

Страница 31: ...the overall accuracy of the measurement A difference of 20 mV can be expected between two channels Quadrature Measurements The EX1200 1538 can resolve a digital quadrature signal pair into an absolute...

Страница 32: ...X2 MODE COUNTER INCREMENTS In X4 mode the counter increments or decrements similarly on each edge of Reference and Measurement channels A and B Counter increments or decrements depends on which chann...

Страница 33: ...noise immunity the grounds of the digital input channels use internal optical isolation 2 5 V to 60 V GND The positive input channels should not be driven low in reference to the negative channels Ext...

Страница 34: ...tput The outputs are bipolar and can be configured either as a 10 V voltage source or as a 20 mA current source The analog output updates can either be dynamic frequency to voltage current mode or sta...

Страница 35: ...s each channel has its own ground reference and can be programmed independently It is also possible to interconnect the channels to generate a larger voltage current When both channels are configured...

Страница 36: ...nally the inputs should never be driven below the ground potential or damage may occur The DIO channels allow for the maximum voltage of 60 V per channel When configured as a digital output channel th...

Страница 37: ...o VTEXMultifunction dll in the project Include the following at the top of any code file that will access the driver using VTI VTEXFgen Interop 3 C C on Windows Link against VTEXFgen lib and include V...

Страница 38: ...attributes Caching allows IVI drivers to maintain certain instrument settings to avoid sending redundant commands The standard allows for certain values to be cached always or never In VTI IVI driver...

Страница 39: ...ureInput VARIANT_TRUE VTEXMultifunctionCounterInputTypeAnalog VTEXMultifunctionCounterInputModeDifferential 48 VTEXMultifunctionCounterCouplingAC mfunction Counter Channels Item CH2 Function VTEXMulti...

Страница 40: ...H3 UpperFrequencyLimit 2000 Maximum frequency of 2000Hz mfunction Counter Channels Item CH3 LowerFrequencyLimit 2 Lower frequency of 2Hz Polarity setting will NOT have any effet on totalize measuremen...

Страница 41: ...ime_fraction for long scan 0 scan fifocount scan double dSecond dFraction SafeArrayGetElement time scan void dSecond SafeArrayGetElement time_fraction scan void dFraction fprintf stderr Time f n dSeco...

Страница 42: ...ltifunction try Initialize new session mfunction Initialize TCPIP 10 30 1 16 INSTR VARIANT_TRUE VARIANT_TRUE measuring frequency in a anaglog channel Differential measurement EX1200 1538 has only two...

Страница 43: ...onfigureInput VARIANT_TRUE VTEXMultifunctionCounterInputTypeDigital VTEXMultifunctionCounterInputModeSingleEnded 0 VTEXMultifunctionCounterCouplingDC Frequency measurement setting mfunction Counter Ch...

Страница 44: ...no_of_channels_enabled 2 For each trigger all channels data will be stored In our case 2 channels is enabled and 10 readings are taken So we will get 20 data points in the data array SAFEARRAY data N...

Страница 45: ...he RPM using an encoder or syncro resolver less voltage type int _tmain int argc _TCHAR argv CoInitialize NULL try IVTEXMultifunctionPtr mfunction __uuidof VTEXMultifunction try Initialize a new sessi...

Страница 46: ...a Digital channel Only single measurement possible with EX1200 1538 EX1200 1538 has only TTL logic for Digital channels So range setting is ignored Digital channels configuration Coupling setting is...

Страница 47: ...here it is two Channel 1 and channel 2 int no_of_channels_enabled 2 For each trigger all channels data will be stored In our case 2 channels is enabled and 10 readings are taken So we will get 20 dat...

Страница 48: ...hat for finding the phase measurement and time interval measurement of continuous signal both the signal should be of same frequency int _tmain int argc _TCHAR argv CoInitialize NULL try IVTEXMultifun...

Страница 49: ...affect only the Channel 2 frequency measurement only NOT Time interval measurement The slope configuration will NOT have any effect mfunction Counter Channels Item CH2 ConfigureThreshold 0 2 5 VTEXMul...

Страница 50: ...RAY time NULL SAFEARRAY time_fraction NULL Read the measurements mfunction Measurement ReadFifo 0 fifocount data time time_fraction for long scan 0 scan fifocount scan double dSecond dFraction SafeArr...

Страница 51: ...re Encoder cpp Defines the entry point for the console application include stdafx h import IviDriverTypeLib dll no_namespace import VTEXMultifunction dll no_namespace This example measures the RPM and...

Страница 52: ...ounter Channels Item CH2 Function VTEXMultifunctionCounterFunctionRpm Enable Fifo for the channels mfunction Counter Channels Item CH1 FifoEnabled VARIANT_TRUE mfunction Counter Channels Item CH2 Fifo...

Страница 53: ...raction SafeArrayGetElement time scan void dSecond SafeArrayGetElement time_fraction scan void dFraction fprintf stderr Time f n dSecond dFraction for int channel 0 channel no_of_channels_enabled chan...

Страница 54: ..._TRUE Any channel can be configured as input or output Digital input configuration mfunction Dio Channels Item DIO1 Direction VTEXMultifunctionDioDirectionInput Digital input operation mfunction Dio C...

Страница 55: ...ain int argc _TCHAR argv CoInitialize NULL try IVTEXMultifunctionPtr mfunction __uuidof VTEXMultifunction try mfunction Initialize TCPIP 10 30 1 16 INSTR VARIANT_TRUE VARIANT_TRUE Any channel can be c...

Страница 56: ...rogramming the Instrument if mfunction NULL mfunction Initialized Close driver mfunction Close catch _com_error e MessageBox NULL e Description e ErrorMessage MB_ICONERROR CoUninitialize printf nDone...

Страница 57: ...nce the utility is run LInC U will scan the network to discover all LAN based VTI instruments Once the scan is complete the Discovery Devices tab will appear and show the instruments that were discove...

Страница 58: ...s page Action This type of page initiates a command on the instrument but does not involve parameter entry The Reboot page is an example of an action page Entry This type of page displays and accepts...

Страница 59: ...go that appears on the upper left of all EX1200 web pages is a link to the VTI Instruments corporate website http www vtiinstruments com The remainder of this discussion will focus on the EX1200 1538...

Страница 60: ...SOFT FRONT PANEL To navigate to the EX1200 1538 soft front panel click on Soft Front Panel in the Command Menu see Figure 6 3 Next select ex1200 1538 Multi Function from the list of instruments instal...

Страница 61: ...the EX1200 1538 channel that is configured when the column parameters are modified Enabled When selected this checkbox indicates that the counter channel is configured and ready for measurements To mo...

Страница 62: ...rns an invalid value NaN as a result o Preset When an overflow occurs the instrument counter rolls over and begins counting from the defined Preset Count o Wraparound default When an overflow occurs t...

Страница 63: ...Data LED Indicates the logical state of the DIO line When the LED is green the DIO line is a logical High A red LED indicates a logical Low Enabled checkbox When selected the channel acts as configur...

Страница 64: ...nd its logical is monitored Drive Mode Sets the DAC channel as either a Voltage or Current output Output Mode Sets the DAC channel as either Static or Dynamic Counter Channel When the Output Mode is s...

Страница 65: ...gure 6 8 as an example the LED displays the channel e g CH1 the return value e g Infinity and the channel s Function e g Frequency These fields are only populated when 1 the counter channel is enabled...

Страница 66: ...an be Immediate Software or one of the EX1200 mainframe backplane lines BPL0 through BPL7 Software Trigger Clicking on this button generates a software trigger that causes data the instrument to be in...

Страница 67: ...hen the Device Information button is clicked the user can access information regarding the EX1200 1538 s version This information includes the revision of the soft front panel the firmware revision th...

Страница 68: ...VTI Instruments Corp 68 EX1200 1538 SFP Operation...

Страница 69: ...31 RPM measurements 29 signal conversion 23 time interval measurements 30 totalizing 24 counter timer operation 21 32 D DAC See analog output digital I O circuit protection 35 digital I O function 54...

Страница 70: ...IO control page 63 DIO status 65 LED panel 65 lock 66 monitor page 65 reset 66 specifications 11 analog output 12 counter input 11 DIO 12 general 11 support resources 7 system power requirements 15 T...

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