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9 Signametrics 2.0 Specifications 2.1 DC Voltage Measurement Input Characteristics • Input Res

99 Signametrics ValueReturn Value Integer error code. Meaning KAY Operation successfully com

Signametrics 100 Remarks This Secondary function sets the DC voltage source to ldVolts. The DMM

101 Signametrics lue Erro Example DMMSetExternalShunt(0, 100000.0); // Set shunt to 100kΩ SMX

Signametrics 102 Parameter Type/Description int Identifies the DMM. DMMs are numnDmm bered sta

103 Signametrics emarks This function enables or disables the Offset Ohms compensation functio

Signametrics 104 Description et the DMM reading rate. Remarks ning in the uming CPU resources.

105 Signametrics scription Set the DMM relative reading mode for the present function. 2.h&quo

Signametrics 106 DMMSetResistance SMX2040  SMX2042 Description s to be synthesized m e value

107 Signametrics Value Meaning OKAY Operation successfully completed. e Value Error code DMMSe

Signametrics 108 OOP or ED_LOOP the Trim DAC is also used, which augments the 12 bit DAC to e bi

Signametrics 10 Accuracy ±

109 Signametrics int status = DMMSetSynchronized(0, FALSE); // Cancell sync. DMMSetTCType SMX2

Signametrics 110 Return Value The return value is one of the following constants. Value Meaning

111 Signametrics Negative Value Error code. Example DMMSetTrimDSMX2040  SMX2042 Descriptio

Signametrics 112 int DMMStartTotalizer(int nDmm, int Edge) function and the DMM must be in ACV

113 Signametrics lizer talizer. Parame DMMStopTotaSMX2040  SMX2042 ; SMX2044 ; Description

Signametrics 114 DMMTrigSMX2040 ; SMX2042 ; SMX2044 Description Software Trigg #include "

115 Signametrics rParamete Type/Description nDmm int Identifies th MMs are numbered starting

Signametrics 116 section presents maintenance information for the DMM. calibration is listed be

117 Signametrics 6.1 Performance Tests This test compares the performance of the SMX2040/44 wi

Signametrics 118 6.3 Resistance Test, 2-wire The following procedure may be used to verify the

11 Signametrics 2.3.4 AC Median Value Measurement (SMX2044) • Measures the mid-point between t

119 Signametrics Table 9-4 Resistance Test, 4-wire Step Range Input Minimum Reading Maximu

Signametrics 120 6.5 AC Voltage Test The following procedure may be used to verify the accuracy

121 Signametrics 6.6 DC Current Test The following procedure may be used to verify the accurac

Signametrics 122 6.8 Capacitance Test (SMX2044 only) The following procedure may be used to ver

123 Signametrics 6.9 Frequency Counter Test (SMX2044 only) The following procedure may be used

Signametrics 124 6.10 Calibration Each SMX2040 DMM uses its own SM40CAL.DAT calibration file to

125 Signametrics 7.0 Warranty and Service The SMX2040 is warranted for a period of one year fr

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Signametrics 12 2.5 Resistance Measurements 2.5.1 2-wire and 4-wire

13 Signametrics 2.8 Additional Component Measurements2.8.1 Diode Characterization • Available

Signametrics 14 2.9 Timing Measurements (SMX2042, 44) 2.9.1 Threshold DAC • The Threshold DAC i

15 Signametrics Polarity Frequency range Resolution Width range Typical Uncertainty Positiv

Signametrics 16 2.11 Source Functions (SMX2044) • Isolated to 300 V DC from the Chassis • Curr

17 Signametrics 2.12 Accuracy Notes Important All accuracy specifications for DCV, Resistance,

Signametrics 18 2.13 Other Specifications Temperature Coefficient, All Functions Le

Operator's Manual Model SMX2040 6½ Digit Digital Multimeter Model SMX2042 6½ Digit Multi-Function Digital Multimeter Model SMX2044 6

19 Signametrics 3.0 Getting Started After unpacking the DMM, please inspect for any shipping da

Before using the DMM, please take a few moments and review this section to understand where the voltage, current, or resistance and other inputs and o

21 Signametrics circuit resistor measurements by means of isolating a loading node. The DIN-7 p

3.6 Using the Control Panel Figure 3-2. The Control Panel for the SMX2044. The three main groups include Measure, Source and ange buttons. The 8 Ra

Range Can be set to AutoRange or manual by clicking on the appropriate range in the lower part of the Windows panel. Autoranging is best used for be

Signametrics 24 4.0 DMM Operations and Measurements Most of the SMX2040 measurement functions ar

4.1.2 True RMS AC Voltage Measurements ACV is specified for signals greater than 1mV, from 10 Hz to 100 kHz. The ACV function is AC coupled, and measu

4.1.4 AC Median Value Measurement (SMX2044) To better understand the usage of this function, you should note that the DMM makes all AC voltage measure

27 Signametrics ractical, higher current measurements be limited to short time. The lower two r

Signametrics 28 up to 330 kΩ. 4-wire measurements are disabled above 330 kΩ since the extra set

Signametrics 2 CAUTION In no event shall Signametrics or its Representatives be li

29 Signametrics flow through the shunting path. With this “guarding”, the MX2044 accurately me

Figure 4-5. Leakage Test Configuration. Measurement of reverse diode leakage at 3.3V. 4.3.6 Extended Resistance Measurements (SMX2044) The Extended

Figure 4-6. Extended Ohms range. 4.3.7 Effects of Thermo-Voltaic Offset Resistance measurements are sensitive to Thermo-Voltaic (Thermal EMF) errors

4.3.8 Guarding High Value Resistance Measurements (SMX2044) Measuring high value resistors using the 2-Wire function require special attention. Due to

33 Signametrics nce s used for characterizing semiconductor part types. This function is design

Signametrics 34 s the AC based method. Though not as accurate as the above nction, the advantage

35 Signametrics posi lectable edge parameter. Read about g ers the DMM at a specific input lev

Signametrics 36 Switch Settings S6 S5 S4 Trigger Output Routing 0 0 0 Disables trigge

Figure 4-11. AC coupled timing measurements with Threshold DAC. With the 3.3 ACV range selected, a 10% duty-cycle square wave with 5 V peak-to-peak

Signametrics 38 C to his is particularly important for signals with low duty-cycle and small

3 Signametrics TABLE OF CONTENTS 1.0 INTRODUCTION...

4.13 Sourcing Functions (SMX2044) The SMX2044 adds a number of sourcing functions, giving greater versatility for a variety of applications. All of th

4.13.2 AC Voltage Source The AC voltage source is fully isolated. It has two modes of operation: fast settling or closed loop. In the Closedloop mod

Figure 4-16. Sourcing DC current and measbe used for semiconductor parametric tests. uring voltage in the two wire configuration. This function can

Signametrics 42 electing the appropriate external resistor is very important. It sets the accur

43 Signametrics ggered to take from the computer, whereby the Scanner selects channels from its

Signametrics 44 MMSetBuffTrigRead(nDmm, 4, nReadings, NegEdge) ‘ Use 4 settling readings each C

45 Signametrics 5.0 SMX2040 DMM Windows Interface 5.1 Distribution Files The main directory o

Signametrics 46 directory. e verall analog performance for that DMM. You must not alter this fi

47 Signametrics DMM hardware. DMMInit accepts the name and location of the calibration file.

Signametrics 48 **** * M" /D "_CONSOLE" /D "_MBCS" 040.pch" /YX /

Signametrics 4 4.1.3 AC Peak-to-Peak and Crest Factor Measurement (SMX2044) ...

49 Signametrics he source code file GLOBAL.BAS (in the V_BASIC directory of the distribution di

Signametrics 50 parameters on your DMM are set up as follows: • Temperature units are set to °C

51 Signametrics 5.6 Windows Command Language The following section contains detailed de se com

Signametrics 52 terParame Type/Description e numbered starting with zero. ber of samples the DM

53 Signametrics Value Meaning DMM_y termNegative Value Exa(0,64); while( ! DMMReady(0)); Buff

Signametrics 54 MBur each ile( ! DMMReady(0) ); // wait for completion 50 ; i++) // read 6

55 Signametrics while( ! DMMReadMeasurement(0 , Reading[i]) ); DMMCalibrate SMX2040 ; SM 2

Signametrics 56 ccessfully completed. NegativExa int status = DMMCleanRelay(0, 2, 100); // Shake

57 Signametrics Remarks een 0.0 and 100.0 ParameterNegative Value Error code Example int s

Signametrics 58 Erro DMMDisableTrimDAC(0); // Remove Trim DAC from operation DMMDisArmTrigger S

5 Signametrics DMMDelay ...

59 Signametrics lue Example char cBuf[17] DMMErrString MX2042Description Return the string t

Signametrics 60 Parameter Type/Description Identifies the DMM. DMMs are numbered starting wi

61 Signametrics DMMGetACCapsR SMX2040  SMX2042  SMX2044 Description Return the resist #incl

Signametrics 62 Parameter Type/Description nDmm bus a pointer to integer at which the bus numbe

63 Signametrics Remarks ble floating value that is the dB deviation relative to the ading made

Signametrics 64 Des the currently set cold junction temperature. 2.h" emarks ncion temper

65 Signametrics DMMGetDeviatStr SMX2040 ; S X2044 ; Description ent deviat reading at the tim

Signametrics 66 M.h for function/range codes. r code rintf("Lowest VDC range SMX2040 ; SMX2

67 Signametrics VersiNegativeample firmwarever = DMMGetGrdVer(0); DMMGetHwVer SMX2042Descripti

Signametrics 68 DMM_E_DMM Example int id = DMDMMGetManDate SMX2040 ; SMX2042 ; SMX2Description

Signametrics 6 DMMSetACCapsDelay ...

69 Signametrics nDmm zero. lpdMax Return Value Integer error code.. Valueint Identifies th

Signametrics 70 ouble floating value that is the minimum (of the Min/Max nction) value since eit

71 Signametrics escription Get DMM range code. #include "sm204032.h" Remarks func

Signametrics 72 int DMMGetSourceFreq(int nDmm, double FAR *lpdFreq) Remarks This function retu

73 Signametrics s the DMM type. ParameRemarks This function returnter Type/Description nDmm Ms

Signametrics 74 #include "sm2 int DMMInit(iRemarks This function m ed. It opens the drive

75 Signametrics Return Value TRUE, FALSE or an error code. Value Meaning TRUE A d. AI number

Signametrics 76 eturn Value Integer TRUE, FALSE or an error code. R Value Meaning TRUE FALSE mo

77 Signametrics DMMOpenPCI MX2040 ; SMX2042 ; SMX2044 ; escription Open the PCI bus for the sp

Signametrics 78 Return Value Integer error co de. Value Meaning ration successfully complete

1.0 Introduction Congratulations! You have purchased a PXI/CompactPCI Plug-in instrument with analog and systems performance that rivals the best, al

79 Signametrics emarks This function makes a period measurement and returns the result as a st

Signametrics 80 DMMPol SMX2040 ; SMX2042 ; SMX2044 eading. #include "sm2 nt DMMPolleRema

81 Signametrics Parameter Type/Description nDmm int Identifies the DMM. DMMs are numbered sta

Signametrics 82 he DMM. em reads the next result from the DMM, performs all scaling and convers

83 Signametrics DMMReadBufSMX2040 ; SMX2042Description m204032.h" DMMRead , , LPSTR

Signametrics 84 bsequent thrermocouple measurements. When measuring temperature using thermocou

85 Signametrics lue ValueReturn Va The return value is one of the following constants. Meaning

Signametrics 86 Rem counter is not engaged, select it. Make a single frequency measurement, t

87 Signametrics DMMReadInductorQ SMX2040  SMX2042  SMX2044 ;Description Return inductor’s #

Signametrics 88 Value Meaning TRUE Measurement was read into *lpdRead T OVERRPU did not keep u

Signametrics 8 1.2 Minimum Requirements The SMX2040 series of system DMMs are precision plug-in

89 Signametrics units. That is, it turns 0.3 for a 300 mV input and 1e6 for 1.0 MOhm. Paramete

Signametrics 90 Description Return the next double floating-point period reading from the DMM.

91 Signametrics Valid return. DMM_E_RANGE Example status = DMMReadingStr(0, cBuf); DMMRea

Signametrics 92 DMMReadWidth SMX2040  SMX2042 ; SMX2044 Description Return the posit nclude &q

93 Signametrics ValueReturn Value The return value is one of the following constants. Meaning

Signametrics 94 Remarks This Secondary function sets the AC peak voltage level for the AC based

95 Signametrics Value Meaning KAY Operation successfully completed. e Value Error code double

Signametrics 96 Remarks is h struments such as the SM4042 relay scanner. No autoranging is all

97 Signametrics hen using this function keep in mind that the accuracy tance is not guaranteed.

Signametrics 98 SMX2040  SMX2044 ; Description Th " " " .h" em dary funct