Signametrics SMX2040 User manual

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Operator's Manual
Model SMX2040 6½ Digit Digital Multimeter
Model SMX2042 6½ Digit Multi-Function Digital Multimeter
Model SMX2044 6½ Digit LCR Sourcing Digital Multimeter
Signametrics Corporation
December, 2004
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Signametrics 2
CAUTION
In no event shall Signametrics or its Representatives be liable for any consequential damages whatsoever (including,
without limitation, damages for loss of business profits, business interruption, loss of business information, or other
loss) arising out of the use of or inability to use Signametric's products, even if Signametrics has been advised of the
possibility of such damages. Because some states do not allow the exclusion or limitation of liability for
consequential damages, the above limitations may not apply to you.
©1999 Signametrics Corp. Printed in the USA. All rights reserved. Contents of this publication must not be
reproduced in any form without the permission of Signametrics Corporation.
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3 Signametrics
TABLE OF CONTENTS
1.0 INTRODUCTION.................................................................................................................................................7
1.1 S AFETY C ONSIDERATIONS ..........................................................................................................................7
1.2 M INIMUM R EQUIREMENTS .........................................................................................................................8
1.3 F EATURE S ET .............................................................................................................................................8
2.0 SPECIFICATIONS...............................................................................................................................................9
2.1 DC V OLTAGE M EASUREMENT ...................................................................................................................9
2.2 DC C URRENT M EASUREMENT ....................................................................................................................9
2.3 AC V OLTAGE M EASUREMENTS ..................................................................................................................9
2.3.1 AC Voltage True RMS Measurement.......................................................................................9
2.3.2 AC Peak-to-Peak Measurement (SMX2044)..........................................................................10
2.3.3 AC Crest Factor Measurement (SMX2044)...........................................................................10
2.3.4 AC Median Value Measurement (SMX2044).........................................................................11
2.4 AC C URRENT M EASUREMENT , T RUE RMS..............................................................................................11
2.5 R ESISTANCE M EASUREMENTS ..................................................................................................................12
2.5.1 2-wire and 4-wire...................................................................................................................12
2.5.2 6-wire Guarded Resistance Measurement (SMX2044)..........................................................12
2.6 L EAKAGE M EASUREMENT (SMX2044)....................................................................................................12
2.7 RTD T EMPERATURE M EASUREMENT (SMX2044)...................................................................................12
2.8 A DDITIONAL C OMPONENT M EASUREMENTS ............................................................................................13
2.8.1 Diode Characterization .........................................................................................................13
2.8.2 Capacitance Measurement (SMX2042, 44)...........................................................................13
2.8.3 Inductance Measurement (SMX2044)....................................................................................13
2.8.4 In Circuit AC-Based Capacitance Measurements (SM2044) ................................................13
2.9 T IMING M EASUREMENTS (SMX2042, 44)................................................................................................14
2.9.1 Threshold DAC ......................................................................................................................14
2.9.2 Frequency and Period Measurement.....................................................................................14
2.9.3 Duty Cycle Measurement.......................................................................................................14
2.9.4 Pulse Width............................................................................................................................14
2.9.5 Totalizer.................................................................................................................................15
2.10 T RIGGER F UNCTIONS ..............................................................................................................................15
2.10.1 External Hardware Trigger (at DIN-7 connector) ..............................................................15
2.10.2 PXI Bus Hardware Trigger Inputs (at PXI J2)....................................................................15
2.10.3 PXI Bus Hardware Trigger Output (to PXI J2)...................................................................15
2.10.4 Analog Threshold Trigger....................................................................................................15
2.11 S OURCE F UNCTIONS (SMX2044)...........................................................................................................16
2.11.1 DC Voltage Source ..............................................................................................................16
2.11.2 AC Voltage Source...............................................................................................................16
2.11.3 DC Current Source..............................................................................................................16
2.12 A CCURACY N OTES .................................................................................................................................17
2.13 O THER S PECIFICATIONS .........................................................................................................................18
3.0 GETTING STARTED.........................................................................................................................................19
3.1 S ETTING THE DMM..................................................................................................................................19
3.2 I NSTALLING THE DMM M ODULE .............................................................................................................19
3.3 I NSTALLING THE DMM SOFTWARE PACKAGE ...........................................................................................19
3.4 DMM I NPUT C ONNECTORS ......................................................................................................................19
3.5 S TARTING THE C ONTROL P ANEL ..............................................................................................................21
3.6 U SING THE C ONTROL P ANEL ....................................................................................................................22
4.0 DMM OPERATIONS AND MEASUREMENTS.............................................................................................24
4.1 V OLTAGE M EASUREMENT ........................................................................................................................24
4.1.1 DC Voltage Measurements ....................................................................................................24
4.1.2 True RMS AC Voltage Measurements ...................................................................................25
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Signametrics 4
4.1.3 AC Peak-to-Peak and Crest Factor Measurement (SMX2044).............................................25
4.1.4 AC Median Value Measurement (SMX2044).........................................................................26
4.2 C URRENT M EASUREMENTS ......................................................................................................................26
4.2.1 Improving Current Measurements.........................................................................................26
4.2.2 Low Level DC Current Measurements...................................................................................27
4.2.3 Extended DC Current Measurements (SM2044) ...................................................................27
4.3 R ESISTANCE M EASUREMENTS ..................................................................................................................27
4.3.1 2-wire Ohm Measurements....................................................................................................27
4.3.2 4-wire Ohm Measurements....................................................................................................27
4.3.3 Using Offset Ohms function...................................................................................................28
4.3.4 6-wire Guarded Resistance Measurement (SMX2044)..........................................................28
4.3.5 Leakage Measurements (SMX2044) ......................................................................................29
4.3.6 Extended Resistance Measurements (SMX2044)...................................................................30
4.3.7 Effects of Thermo-Voltaic Offset............................................................................................31
4.3.8 Guarding High Value Resistance Measurements (SMX2044)...............................................32
4.4 RTD T EMPERATURE M EASUREMENT (SMX2044)...................................................................................32
4.5 I NTERNAL T EMPERATURE (SMX2044) ....................................................................................................32
4.6 D IODE C HARACTERIZATION .....................................................................................................................33
4.7 C APACITANCE M EASUREMENT (SMX2044).............................................................................................33
4.8 I N -C IRCUIT C APACITANCE M EASUREMENT (SMX2044)..........................................................................34
4.9 I NDUCTANCE M EASUREMENT (SMX2044) ..............................................................................................34
4.10 C HARACTERISTIC I MPEDANCE M EASUREMENT (SMX2044)..................................................................34
4.11 T RIGGER O PERATION .............................................................................................................................34
4.11.1 External Hardware Trigger.................................................................................................34
4.11.2 Analog Threshold Trigger....................................................................................................35
4.11.3 Software Issued Triggered Operations................................................................................35
4.11.4 Using the PXI bus Trigger Facilities...................................................................................35
4.12 F REQUENCY AND T IMING M EASUREMENTS (SMX2042, 44)..................................................................36
4.12.1 Threshold DAC ....................................................................................................................36
4.12.2 Frequency and Period Measurements .................................................................................37
4.12.3 Duty Cycle Measurement.....................................................................................................38
4.12.4 Pulse Width..........................................................................................................................38
4.12.5 Totalizer Event Counter.......................................................................................................38
4.13 S OURCING F UNCTIONS (SMX2044).......................................................................................................39
4.13.1 DC Voltage Source ..............................................................................................................39
4.13.2 AC Voltage Source...............................................................................................................40
4.13.3 DC Current Source..............................................................................................................40
4.13.4 Source Current - Measure Voltage......................................................................................40
4.14 S YNTHESIZING R ESISTANCE (SMX2044)...............................................................................................41
4.15 I NTERFACING TO THE SMX4032 SERIES R ELAY S CANNERS ...................................................................42
4.15.1 Triggering the SMX2040 DMMs .........................................................................................42
4.15.2 Multiplexing with the SMX2040 DMMs...............................................................................43
4.15.3 Interface Commands and Timing.........................................................................................43
5.1 D ISTRIBUTION F ILES ................................................................................................................................45
5.1.1 The SM40CAL.DAT file ........................................................................................................46
5.2 U SING THE SMX2040 D RIVER W ITH C++ OR S IMILAR S OFTWARE ..........................................................47
Multiple Card Operations Under Windows....................................................................................47
5.3 V ISUAL B ASIC F RONT P ANEL A PPLICATION .............................................................................................48
5.3.1 Visual Basic Simple Application............................................................................................49
5.4 W INDOWS DLL D EFAULT M ODES AND P ARAMETERS ..............................................................................49
5.5 U SING THE SMX2040 DLL WITH L AB W INDOWS /CVI®.........................................................................50
5.6 W INDOWS C OMMAND L ANGUAGE ...........................................................................................................51
DMMArmAnalogTrigger ................................................................................................................51
DMMArmTrigger............................................................................................................................52
DMMBurstBuffRead .......................................................................................................................53
DMMBurstRead..............................................................................................................................54
DMMCalibrate................................................................................................................................55
DMMCleanRelay ............................................................................................................................55
DMMClearMinMax ........................................................................................................................56
DMMClosePCI ...............................................................................................................................56
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5 Signametrics
DMMDelay .....................................................................................................................................57
DMMDisableTrimDAC...................................................................................................................57
DMMDisArmTrigger ......................................................................................................................58
DMMDutyCycleStr .........................................................................................................................58
DMMErrString................................................................................................................................59
DMMFrequencyStr.........................................................................................................................59
DMMGetACCapsR .........................................................................................................................61
DMMGetBusInfo.............................................................................................................................61
DMMGetCalDate............................................................................................................................62
DMMGetdB.....................................................................................................................................62
DMMGetdBStr................................................................................................................................63
DMMGetCJTemp............................................................................................................................63
DMMGetDeviation .........................................................................................................................64
DMMGetDeviatStr..........................................................................................................................65
DMMGetFuncRange.......................................................................................................................65
DMMGetFunction...........................................................................................................................66
DMMGetGrdVer.............................................................................................................................66
DMMGetHwVer..............................................................................................................................67
DMMGetID.....................................................................................................................................67
DMMGetManDate..........................................................................................................................68
DMMGetMax..................................................................................................................................68
DMMGetMaxStr .............................................................................................................................69
DMMGetMin...................................................................................................................................69
DMMGetMinStr..............................................................................................................................70
DMMGetRange...............................................................................................................................70
DMMGetRate..................................................................................................................................71
DMMGetSourceFreq ......................................................................................................................71
DMMGetTCType.............................................................................................................................72
DMMGetType .................................................................................................................................72
DMMGetVer ...................................................................................................................................73
DMMInit .........................................................................................................................................73
DMMIsAutoRange ..........................................................................................................................74
DMMIsInitialized............................................................................................................................75
DMMIsRelative...............................................................................................................................75
DMMLoadCalFile...........................................................................................................................76
DMMOpenPCI................................................................................................................................77
DMMOpenCalACCaps...................................................................................................................77
DMMOpenTerminalCal..................................................................................................................78
DMMPeriodStr ...............................................................................................................................78
DMMPolledRead ............................................................................................................................80
DMMPolledReadCmd.....................................................................................................................80
DMMPolledReadStr........................................................................................................................81
DMMRead.......................................................................................................................................81
DMMReadBuffer.............................................................................................................................82
DMMReadBufferStr........................................................................................................................83
DMMReadCJTemp .........................................................................................................................83
DMMReadCrestFactor ...................................................................................................................84
DMMReadDutyCycle......................................................................................................................85
DMMReadFrequency......................................................................................................................85
DMMReadFrequencyStr.................................................................................................................86
DMMReadInductorQ......................................................................................................................87
DMMReadMeasurement.................................................................................................................87
DMMReadMedian...........................................................................................................................88
DMMReadNorm..............................................................................................................................88
DMMReadPeakToPeak...................................................................................................................89
DMMReadPeriod............................................................................................................................89
DMMReadStr..................................................................................................................................90
DMMReadTotalizer ........................................................................................................................91
DMMReadWidth.............................................................................................................................92
DMMReady.....................................................................................................................................92
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Signametrics 6
DMMSetACCapsDelay ...................................................................................................................93
DMMSetACCapsLevel....................................................................................................................93
DMMSetACVSource .......................................................................................................................94
DMMSetAutoRange ........................................................................................................................95
DMMSetBuffTrigRead ....................................................................................................................95
DMMSetCapsAveSamp...................................................................................................................96
DMMSetCJTemp.............................................................................................................................97
DMMSetCompThreshold ................................................................................................................98
DMMSetCounterRng.......................................................................................................................98
DMMSetDCISource........................................................................................................................99
DMMSetDCVSource.......................................................................................................................99
DMMSetExternalShunt.................................................................................................................100
DMMSetFuncRange......................................................................................................................101
DMMSetFunction..........................................................................................................................101
DMMSetInductFreq......................................................................................................................102
DMMSetOffsetOhms.....................................................................................................................102
DMMSetRange..............................................................................................................................103
DMMSetRate.................................................................................................................................103
DMMSetRelative...........................................................................................................................104
DMMSetResistance.......................................................................................................................106
DMMSetRTD ................................................................................................................................106
DMMSetSensoreParams...............................................................................................................107
DMMSetSourceMode....................................................................................................................107
DMMSetSynchronized...................................................................................................................108
DMMSetTCType ...........................................................................................................................109
DMMSetTempUnits.......................................................................................................................109
DMMSetTrigRead.........................................................................................................................110
DMMSetTrimDAC ........................................................................................................................111
DMMStartTotalizer.......................................................................................................................111
DMMStopTotalizer .......................................................................................................................113
DMMTerminate.............................................................................................................................113
DMMTrigger.................................................................................................................................114
DMMWidthStr...............................................................................................................................114
SetACCapsFreq.............................................................................................................................115
6.0 MAINTENANCE ..............................................................................................................................................116
6.1 P ERFORMANCE T ESTS ............................................................................................................................117
6.2 DC V OLTAGE T EST ................................................................................................................................117
6.3 R ESISTANCE T EST , 2- WIRE .....................................................................................................................118
6.4 R ESISTANCE T EST , 4- WIRE .....................................................................................................................118
6.5 AC V OLTAGE T EST ................................................................................................................................120
6.6 DC C URRENT T EST ................................................................................................................................121
6.7 AC C URRENT T EST ................................................................................................................................121
6.8 C APACITANCE T EST (SMX2044 ONLY )..................................................................................................122
6.9 F REQUENCY C OUNTER T EST (SMX2044 ONLY ).....................................................................................123
6.10 C ALIBRATION .......................................................................................................................................124
7.0 WARRANTY AND SERVICE.........................................................................................................................125
8.0 ACCESSORIES.................................................................................................................................................125
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1.0 Introduction
Congratulations! You have purchased a PXI/CompactPCI Plug-in instrument with analog and systems performance
that rivals the best, all-in-one box instruments. The SMX2040 series digital multimeters (DMMs) are easy to setup
and use, have sophisticated analog and digital circuitry to provide very repeatable measurements, and are protected
to handle any unexpected situations your measurement environment may encounter. To get years of reliable service
from these DMMs, please take a few moments and review this manual before installing and using this precision
instrument.
This manual describes the SMX2040 and SMX2044 DMMs. Each DMM delivers unmatched breakthrough
performance in a PXI and CompactPCI plug-in instrument. With a rich repertoire of functions, the SMX2040 series
out performs all other plug-in DMMs, including the trusted Signametrics SM-2020CT, and most brand named
bench top units.
Note: In this manual, all references to the "SMX2040" and “DMM” apply to the SMX2040 and SMX2044.
Features unique to the SMX2044 will be identified as such.
1.1 Safety Considerations
Safety Considerations
The SMX2040 series of DMMs is capable of measuring up to 300 VDC or 250 VAC across the Volt HI
and LO terminals, and can also measure common mode signals that "float" the DMM above EARTH
ground by up to 300 VDC or 250 VAC. When making common mode measurements, the majority of the
circuits inside the DMM are at the common mode voltage. These voltages can be lethal and can KILL!
During and after installing your DMM, check to see that there are no wires or ribbon cables from
your PXI/CompactPCI chassis trapped inside the DMM.
The DMM comes installed with two shields (bottom and top) that must not be removed for performance
as well as safety reasons. Removal of these shields and/or improper assembly of the shields can result in
lethal voltages occurring within your chassis. Also make sure the chassis is 3U in size.
Warning
Check to see that no loose wires or ribbon cables infringe upon any of the internal circuits of the
DMM, as this may apply measurement voltages to your computer, causing electrocution and/or
damage to your PXI/CompactPCI chassis !
To avoid shock hazard, install the DMM only into a 3U PXI and CompactPCI chassis that has its
power connector connected to a power receptacle with an earth safety ground.
When making any measurements above 50 VDC or 40 VAC, only use Safety Test Leads. Examples of
these are the Signametrics Basic Test Leads and Deluxe Test Leads, offered as an optional accessory with
the Signametrics DMMs. Do not use these units in a 6U chassis as an electrocution hazard will be
present.
7 Signametrics
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Signametrics 8
1.2 Minimum Requirements
The SMX2040 series of system DMMs are precision plug-in modules that are compatible with 3U PXI or
CompactPCI chassis. The processor type must be a Pentium or equivalent processor running MS Windows. The
DMM requires a single PXI or CompactPCI slot. A mouse must be installed when controlling the DMM from the
Windows Control Panel. The SMX2040 comes with a Windows' DLL, for operation with Windows' Version
95/98/Me/2000/XP and NT4.0.
1.3 Feature Set
The base unit, the SMX2040, has 6-1/2 digit performance and can be used as a general purpose DMM, giving very
accurate and stable readings. The SMX2044 adds to the SMX2040 additional measurement functions not found in
other DMMs such as inductance measurement and sourcing capabilities.
SMX2040, 42, 44 6½ Digit DMMs feature table:
Function SMX2040
DMM SMX2042 Multi-Function
DMM
SMX2044 LCR
Sourcing DMM
DCV 4 ranges, >10 GΩ& 10 MΩinput
resistance. √√√
ACV 4 ranges, 1 MΩinput √√√
2-Wire Ohms, six ranges 330 Ωto 33 MΩ√plus 33 Ω,
330 MΩplus 33 Ω, 330 MΩ
4-Wire Ohms, four ranges 330 Ωto 330 kΩ√plus 33 Ωplus 33 Ωrange
Offset Ohms √√√
DC current, four ranges 3.3 mA to 2.5 A √√√
AC current, four ranges 3.3 mA to 2.5 A √√√
Diode V/I characteristics at 100 ηA to 1mA √plus 10 mA plus 10 mA
Auto range, Relative √√√
Min/Max, dB and percent deviation functions √√√
On board measurement buffer √√√
Measurement rate: 0.2 to 1,000/sec √√√
External and threshold trigger √√√
Thermocouples √√√
High Dynamic range; +3,300,000 counts √√√
PXI Trigger In/Out √√√
Capacitance, seven ranges, 10 nF to 10 mF √√
Temperature (five basic RTD types) √√
Frequency / Period measurement √√
Pulse width, pos./neg., & duty cycle √√
Totalizer/event counter √√
Variable threshold DAC; all timing measure. √√
Peak to Peak, Crest factor, Median √√
Internal DMM temperature sensor √√
Six wire Ohms (with force/sense) √
Inductance, six ranges 33 µH to 3.3 H √
DCV source 0 to +/-10.0 V √
ACV source 0 to 20 V pk-pk, 2 Hz to 75 KHz √
DC current source, 1 nA to 12.5 mA √
Leakage measurement √
Synthesized resistance source √
Extended Resistance measurements √
In Circuit Capacitance √
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9 Signametrics
2.0 Specifications
2.1 DC Voltage Measurement
Input Characteristics
•Input Resistance 330 mV & 3.3 V Ranges: >10 GΩ,
•Input Resistance 33 V & 330 V Ranges: 10.0 MΩ
Accuracy ± (% of reading + Volts) [1]
Range Full Scale
6 ½ Digits Resolution 24 hours
23°C ±1°C 90 Days 23°C ±5°C One Year 23°C
±5°C
330 mV 330.0000 mV 100 ηV 0.003 + 4.5 µV 0.004 + 5.5 µV 0.007 + 8 µV
3.3 V 3.300000 V 1 µV 0.002 + 10 µV 0.0025 + 12 µV 0.0045 + 17 µV
33 V 33.00000 V 10 µV 0.003 + 250 µV 0.004 + 280 µV 0.007 + 330 µV
330 V 330.0000 V 100 µV 0.004 + 1 mV 0.005 + 1.2 mV 0.008 + 1.5 mV
[1] With reading rate set to 10 readings per second (rps) or slower, and within one hour of DCV
zero, using Relative control.
DCV Noise Rejection Normal Mode Rejection, at 50, 60, or 400 Hz ± 0.5%, is better than 95 dB
for reading rates of 10 rps or lower. Common Mode Rejection (with 1 kΩlead imbalance) is better
than 120 dB for these conditions.
2.2 DC Current Measurement
Input Characteristics
•Burden Voltage < 350 mV for all ranges
•Protected with 2.5A fuse ( 5x20mm, 250 V Fast)
Accuracy ± (% of reading + Amps) [1]
Range Full Scale
5 ½ Digits Resolution 24 hours
23°C ±5°C 90 Days 23°C ±5°C One Year 23°C
±5°C
3.3 mA 3.30000 mA 10 ηA 0.052 + 200 ηA 0.07 + 350 ηA 0.1 + 400 ηA
33 mA 33.0000 mA 100 ηA 0.04 + 1 µA 0.06 + 2 µA 0.1 + 3 µA
330 mA 330.000 mA 1 µA 0.05 + 30 µA 0.055 + 40 µA 0.075 + 60 µA
2.5 A 2.50000 A 10 µA 0.55 + 50 µA 0.6 + 200 µA 0.65 + 350 µA
[1] With reading rate set to 10 rps or slower, and within one hour of DCI zero, using Relative control.
2.3 AC Voltage Measurements
Input Characteristics
•Input Resistance 1.0 MΩ, shunted by < 100 pF, all ranges
•Crest Factor 3 at Full Scale, increasing to 7 at Lowest Specified Voltage
•AC coupled Specified range: 10 Hz to 100 kHz
•Typical Settling time < 0.5 sec to within 0.1% of final value
2.3.1 AC Voltage True RMS Measurement
Range Full Scale 6 ½ Digits Lowest specified Voltage Resolution
330 mV 330.0000 mV 5 mV [1] 100 ηV
3.3 V 3.300000 V 10 mV 1 µV
33 V 33.00000 V 100 mV 10 µV
250 V [2] 250.0000 V 1 V 100 µV
[1] Between 5 mV and 10 mV, add 100 µV additional error to the accuracy table below. In many
computer installations, if the DMM is not near a noisy board, usable voltage measurements of 1 mV
can be obtained.
[2] Signal is limited to 8x10
6
Volt Hz Product. For example, the largest frequency input at 250 V is
32 kHz, or 8x10
6
Volt x Hz.
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Signametrics 10
Accuracy ± (% of reading + Volts) [1]
Range Frequency 24 hours
23°C ±1°C 90 Days 23°C ±5°C One Year 23°C ±5°C
10 Hz - 20 Hz 3.0 + 350 µV 3.1 + 380 µV 3.2 + 430 µV
20 Hz - 47 Hz 0.92 + 150 µV 0.93 + 170 µV 0.95 + 200 µV
47 Hz - 10 kHz 0.13 + 100 µV 0.14 + 110 µV 0.15 + 120 µV
10 kHz - 50 kHz 0.55 + 160 µV 0.6 + 200 µV 0.63 + 230 µV
330 mV
50 kHz - 100 kHz 5.3 + 350 µV 5.4 + 370 µV 5.6 + 400 µV
10 Hz - 20 Hz 3.0 + 2 mV 3.1 + 2.2 mV 3.2 + 2.5 mV
20 Hz - 47 Hz 0.93 + 1.3 mV 0.96 + 1.5 mV 1.0 + 1.7 mV
47 Hz - 10 kHz 0.05 + 1 mV 0.055 + 1.1 mV 0.065 + 1.2 mV
10 kHz - 50 kHz 0.62 + 1.2 mV 0.65 + 1.3 mV 0.70 + 1.5 mV
3.3 V
50 kHz - 100 kHz 5.1 + 1.5 mV 5.2 + 1.7 mV 5.3 + 2 mV
10 Hz - 20 Hz 3.0 + 14 mV 3.1 + 16 mV 3.3 + 20 mV
20 Hz - 47 Hz 0.93 + 12 mV 0.96 + 14 mV 1.0 + 16 mV
47 Hz - 10 kHz 0.06 + 10 mV 0.065 + 11 mV 0.073 + 13 mV
10 kHz - 50 kHz 0.31 + 18 mV 0.33 + 21 mV 0.35 + 25 mV
33 V
50 kHz - 100 kHz 2.0 + 30 mV 2.2 + 35 mV 2.4 + 40 mV
10 Hz - 20 Hz 3.0 + 140 mV 3.1 + 160 mV 3.3 + 200 mV
20 Hz - 47 Hz 0.93 + 120 mV 0.96 + 130 mV 1.0 + 150 mV
47 Hz - 10 kHz 0.04 + 100 mV 0.045 + 110 mV 0.06 + 130 mV
10 kHz - 50 kHz 0.32 + 150 mV 0.4 + 170 mV 0.45 + 200 mV
250 V
50 kHz - 100 kHz 2.5 + 200 mV 2.8 + 240 mV 3.2 + 300 mV
ACV Noise Rejection Common Mode rejection, for 50 Hz or 60 Hz with 1 kΩimbalance in either lead, is better
than 60 dB.
2.3.2 AC Peak-to-Peak Measurement (SMX2044)
•Measures the peak-to-peak value of a repetitive waveform
ACV
Range Lowest specified input voltage
(Vp-p)
Full Scale
reading (Vp-p) Resolution Typical Accuracy 23°C ±5°C
One Year [1]
330 mV 0.1 V 1.85 V 1 mV 1.5 ±10 mV
3.3 V 1.0 V 18.5 V 10 mV 1.4 ±70 mV
33 V 10 V 185.0 V 100 mV 1.0 ±700 mV
250 V 100 V 850.0 V 1 V 1.0 ± 6 V
[1] Specified from 30Hz to 10 kHz. Input signal frequency of 30 Hz to 30 kHz.
2.3.3 AC Crest Factor Measurement (SMX2044)
• Measures the crest factor (peak / RMS) of a repetitive waveform
ACV
Range Lowest specified input voltage
(Vp-p)
Highest specified input
voltages (Vp-p) Resolution Typical Accuracy 23°C ±5°C
One Year [1]
330 mV 0.1 V 1.8 V 0.01 2.2 ±0.3
3.3 V 1.0 V 18 V 0.01 2.1 ±0.1
33 V 10 V 180 V 0.01 2.0 ±0.1
250 V 100 V 700 V 0.01 2.0 ±0.1
[1] Crest factor measurement requires signal frequency of 30 Hz to 30 kHz.
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11 Signametrics
2.3.4 AC Median Value Measurement (SMX2044)
•Measures the mid-point between the positive and negative peaks of a repetitive waveform
•Used to determine the Threshold DAC setting for optimal frequency and timing measurements
ACV
Range Lowest specified input voltage (Vp-p) Full Scale reading Resolution Typical Accuracy 23°C ±5°C One Year [1]
330 mV 0.08 V ±0.95 V 1 mV 2.0% ±17 mV
3.3 V 0.80 V ±9.5 V 10 mV 3% ±160 mV
33 V 8 V ±95.0 V 100 mV 3% ±1.4 V
250 V 80 V ±350.0 V 1 V 3% ±12 V
[1] Median measurements require a repetitive signal with frequency range of 30 Hz to 30 KHz.
2.4 AC Current Measurement, True RMS
Input Characteristics
•Burden Voltage < 350 mV RMS all Ranges
•Crest Factor 3 at Full Scale, increasing to 7 at Lowest Specified Current
• Protected with 2.5 A fuse ( 5x20 mm, 250 V Fast)
Range Full Scale 6 1/2 Digits Lowest Specified Current Resolution
3.3 mA 3.300000 mA 50 µA 1 nA
33 mA 33.00000 mA 500 µA 10 nA
330 mA 330.0000 mA 5 mA 100 nA
2.5 A 2.500000 A 50 mA 1 uA
Accuracy ± (% of reading + Amps)
Range Frequency 24 hours
23°C ±1°C 90 Days 23°C ±10°C One Year 23°C ±10°C
10 Hz - 20 Hz 3.8 + 4 µA 2.7 + 4 µA 2.9 + 4 µA
20 Hz - 47 Hz 0.9 + 4 µA 0.9 + 4 µA 1.0 + 4 µA
47 Hz - 1 kHz 0.04 + 1.5 µA 0.08 + 3 µA 0.12 + 4 µA
3.3 mA
1 kHz - 10 kHz 0.12 + 4 µA 0.14 + 4 µA 0.22 + 4 µA
10 Hz - 20 Hz 1.8 + 30 µA 2.6 + 30 µA 2.8 + 30 µA
20 Hz - 47 Hz 0.6 + 30 µA 0.9 + 30 µA 1.0 + 30 µA
47 Hz - 1 kHz 0.07 + 10 µA 0.15 + 20 µA 0.16 + 30 µA
33 mA
1 kHz - 10 kHz 0.21 + 30 µA 0.3 + 40 µA 0.4 + 40 µA
10 Hz - 20 Hz 1.8 + 400 µA 2.7 + 400 µA 2.8 + 400 µA
20 Hz - 47 Hz 0.6 + 400 µA 0.9 + 400 µA 1.0 + 400 µA
47 Hz - 1 kHz 0.1 + 100 µA 0.17 + 180 µA 0.22 + 220 µA
330 mA
1 kHz - 10 kHz 0.3 + 300 µA 0.4 + 350 µA 0.6 + 400 µA
10 Hz - 20 Hz 1.8 + 4 mA 2.5 + 4.5 mA 2.7 + 5 mA
20 Hz - 47 Hz 0.66 + 4 mA 0.8 + 6 mA 0.9 + 6 mA
47 Hz - 1 kHz 0.6 + 3.8mA 0.63 + 3.8 mA 0.65 + 4 mA
2.5 A
1 kHz - 10 kHz 0.6 + 4mA 0.62 + 4.5 mA 0.7 + 5 mA
Note: All AC Current ranges have typical measurement capability to 20 kHz.
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Signametrics 12
2.5 Resistance Measurements
2.5.1 2-wire and 4-wire
Accuracy ± (% of reading + Ω) [1]
Range [2] Full Scale
6 ½ Digits Resolution Source
current 24 hours
23°C ±1°C 90 Days 23°C ±10°C One Year 23°C ±10°C
33 Ω[3] 33.00000 Ω10 µΩ 10 mA 0.0038 + 1 mΩ0.005 + 1.5 mΩ0.008 + 2 mΩ
330 Ω330.0000 Ω100 µΩ 1 mA 0.0037 + 4.5 mΩ0.0046 + 5 mΩ0.007 + 6 mΩ
3.3 kΩ3.300000 kΩ1 mΩ1 mA 0.0023 + 28 mΩ0.003 + 32 mΩ0.005 + 33 mΩ
33 kΩ33.00000 kΩ10 mΩ100 µA 0.0025 + 300 mΩ0.0033 + 330 mΩ0.006 + 350 mΩ
330 kΩ330.0000 kΩ100 mΩ10 µA 0.0055 + 3.2 Ω0.007 + 4 Ω0.009 + 5 Ω
3.3 MΩ3.300000 MΩ1 Ω1 µA 0.018 + 40 Ω0.03 + 50 Ω0.04 + 70 Ω
33 MΩ33.0000 MΩ100 Ω100 nA 0.12 + 400 Ω0.13 + 500 Ω0.2 + 600 Ω
330 MΩ[3] 330.00 MΩ10 kΩ10 nA 1 + 50 kΩ1.4 + 60 kΩ2.0 + 80 kΩ
[1] With reading rate set to 2 rps or slower, and within one hour of Ohms zero, using Relative control.
[2] 4-wire ohms is available up to the 330 kΩrange.
[3] 33 Ωand 330 MΩranges are only available with the SMX2042,44.
2.5.2 6-wire Guarded Resistance Measurement (SMX2044)
Typical additional error contributed by guarding
Accuracy ± (% of reading + Ω)
Range Source current
One Year 23°C ±5°C [1]
33 Ω10 mA 0.3 + 4 mΩ
330 Ω1 mA 0.003 + 20 mΩ
3.3 kΩ1 mA 0.005 + 100 mΩ
33 kΩ100 µA 0.03 + 1 Ω
330 kΩ10 µA 0.35 + 10 Ω
[1] This table should be used in conjunction with the 2-wire and 4-wire table above.
2.6 Leakage Measurement (SMX2044)
Accuracy ± (% of reading + Ω) [1]
Leakage Reading Voltage range One Year 23°C ±5°C [1]
1.00 ηA to 100.00 ηA -10 V to +10 V 2 + 350 pA
100.00 ηA to 1000.00ηA -9 V to + 9 V 1.2 + 2 ηA
1000.00 ηA to 3.3 µA -7 V to + 7 V 1.5 + 20 ηA
[1] Error does not include external shunt resistor’s tolerance.
2.7 RTD Temperature Measurement (SMX2044)
RTD Type Ro (Ω) Resolution Temperature
range Temperature Accuracy 23°C ±5°C [1]
One Year
pt385, pt3911,
pt3916, pt3926 100, 200 Ω0.01°C -150 to 650°C ±0.06°C
pt385, pt3911,
pt3916, pt3926 500, 1 kΩ0.01°C -150 to 650°C ±0.03°C
Cu (Copper) Less than 12 Ω0.01°C -100 to 200°C ±0.18°C for temperatures ≤20°C, ±0.05°C
otherwise
Cu (Copper) Higher than 90 Ω0.01°C -100 to 200°C ±0.10°C for temperatures ≤20°C, ±0.05°C
otherwise
[1] With reading rate set to 2 rps or slower, using a 4-wire RTD. Measurement accuracy does not
include RTD probe error.
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13 Signametrics
2.8 Additional Component Measurements
2.8.1 Diode Characterization
•Available DC current values 100 ηA, 1 µA, 10 µA, 100 µA and 1 mA. SMX2042 and SMX2044 add 10
mA. SMX2044 has a variable current from 10 ηA to 12.5 mA using the DCI source.
•Typical Current Value Uncertainty 1%
•Typical Voltage Value Uncertainty 0.02%
• Maximum diode voltage compliance 4 V
2.8.2 Capacitance Measurement (SMX2042, 44)
Accuracy ± (% of reading + Farads) [1]
Range Full Scale
4 ½ Digits Resolution One Year
23°C ±5°C
10 ηF 11.999 ηF 1 pF 2.1 ± 5 pF
100 ηF 119.99 ηF 10 pF 1.0
1 µF 1.1999 µF 100 pF 1.0
10 µF 11.999 µF 1 ηF 1.0
100 µF 119.99 µF 10 ηF 1.0
1 mF 1.1999 mF 100 ηF 1.2
10 mF 11.999 mF 1 µF 2
[1] Within one hour of zero, using Relative control. Accuracy is specified for values higher than 5% of the selected
range with the exception of the 10 ηF range, which measures down to 0 pF.
2.8.3 Inductance Measurement (SMX2044)
± (% of reading + inductance) [1]
Range Default
frequency Full Scale
4 ½ Digits Resolution Accuracy 23°C ±5°C
One Year [2]
33 µH 75 kHz 33.000 µH 1 ηH 3.0% + 500 ηH
330 µH 50 kHz 330.00 µH 10 ηH 2.0% + 3 µH
3.3 mH 4 kHz 3.3000 mH 100 ηH 1.5% + 25 µH
33 mH 1.5 kHz 33.000 mH 1 µH 1.5% + 200 µH
330 mH 1 kHz 330.00 mH 10 µH 2.5 + 3 mH
3.3 H 100 Hz 3.3000 H 100 µH 3 + 35 mH
[1] Within one hour of zero, and Open Terminal Calibration.
[2] Accuracy is specified for values greater than 5% of the selected range.
2.8.4 In Circuit AC-Based Capacitance Measurements (SM2044)
Accuracy ± (% of reading + Farads) [1]
Range Full Scale
4 ½ Digits Resolution One Year
23°C ±5°C
33 ηF 32.99 ηF 10 pF 12% ± 250 pF
330 ηF 329.9 ηF 100 pF 5% ± 500 pF
3.3 µF 3.299 µF 1000 pF 4% ± 1 ηF
33 µF 32.99 µF 10 ηF 5% ± 20 ηF
330 µF 329.9 µF 100 ηF 5% ± 1 µF
3.3 mF 3.299 mF 1 µF 7% ± 50 µF
[1] Specified to 2/3 of range (ie. 22 ηF on 33nF range). Within one hour from last AC-Caps Open calibration. Add
an error of 50e-6*R*C (%) due to paralled resistance.
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Signametrics 14
2.9 Timing Measurements (SMX2042, 44)
2.9.1 Threshold DAC
•The Threshold DAC is used for selecting a detection threshold to give optimal frequency and
timing measurements.
± (% of setting + volts)
Selected VAC
range [1] Threshold range (DC level) Threshold DAC
resolution
Highest allowed input
Vp-p Typical one year setting uncertainty
330 mV -1.0 V to +1.0 V 0.5 mV 1.900 V 0.2% + 4 mV
3.3 V -10.0 V to +10.0 V 5.0 mV 19.00 V 0.2% + 40 mV
33 V -100.0 V to 100.0 V 50 mV 190.0 V 0.2% + 0.4 V
250 V -500 V to 500 V 500 V 850.0 V 0.2% + 4 V
[1] This table should be used in conjunction with the AC volts section above.
2.9.2 Frequency and Period Measurement
ACV Mode
• Input Impedance 1 MΩwith < 300 pF
Frequency Range 1 Hz - 100 Hz 100 Hz-1 kHz 1 kHz-10 kHz 10 kHz-100 kHz 100 kHz-300 kHz
Resolution 1 mHz 10 mHz 100 mHz 1 Hz 1 Hz
Uncertainty is ±0.002% of
reading ± adder shown 4 mHz 20 mHz 200 mHz 2 Hz 5 Hz
Input Signal Range [1] 10% - 200%
of range 10% - 200% of range 10% -200% of range 10% - 200% of range 45% -200% of range
[ 1] Input RMS voltage required for a valid reading. Do not exceed 250 V RMS input. For example, 10% -200%
of range indicates that in the 330 mVAC range, the input voltage should be 33 mV to 660 mV RMS.
ACI Mode
• Input Impedance 10 Ωin the 3 mA and 30 mA ranges, 0.1 Ω in the 330 mA and 2.5 A ranges.
Frequency Range 1 Hz - 100 Hz 100 Hz-1 kHz 1 kHz-10 kHz 10 kHz-500 kHz
Resolution 1 mHz 10 mHz 100 mHz 1 Hz
Uncertainty 0.01% ±4 mHz 0.01% ±20 mHz 0.01% ±200 mHz 0.01% ±2 Hz
Input Signal Range,
3.3 mA, 330mA Ranges
[1]
10% -500%
of range 10% - 500% of range 10% -500% of range 10% - 500% of range
Input Signal Range,
33 mA, 2.5A ranges 50% -100% of range 50% - 100% of range 50% - 100% of range 50% - 100% of range
[1] Input current required to give a valid reading. For example, 10% -500% of range indicates that in the 3.3 mA
range, the input current should be 0.33 mA to 16.5 mA.
2.9.3 Duty Cycle Measurement
Frequency Range 1 Hz to 100 Hz 100 Hz to 1 kHz 1 kHz to 10 kHz 10 kHz to 100 kHz
Resolution 0.02% 0.2% 2% 20%
Typical Uncertainty is
±0.03% of reading ±
adder shown
0.03% 0.3% 3% 20%
Full scale reading 100.00 % 100.00 % 100.00 % 100.00 %
2.9.4 Pulse Width
± (% of reading + sec)
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15 Signametrics
Polarity Frequency range Resolution Width range Typical
Uncertainty
Positive or negative pulse
widths 1 Hz to 100 kHz 2 µs 2 µs to 1 s 0.01 +/- 4 µs
2.9.5 Totalizer
•Active edge polarity: Positive or negative transition
•Maximum count: 10^9
• Allowed rate: 1 to 30,000 events per second
•
Uses Threshold DAC
2.10 Trigger Functions
2.10.1 External Hardware Trigger (at DIN-7 connector)
Trigger Input voltage level range High: +3V to +15V, Low: -15V to +0.8V
Ttrigger High current drive Min. 1mA, Max 10mA (TTL or CMOS logic level)
Timing Characteristics Trigger occurs within 2/Reading rate
Trigger Activation Positive or Negative edge depending on trigger
command.
Internal Reading Buffer Up to 1,000 readings/sec into 64 locations reading buffer
Isolation of trigger input ±50 V from analog DMM inputs, and from computer
chassis earth ground.
2.10.2 PXI Bus Hardware Trigger Inputs (at PXI J2)
Trigger Input TTL or CMOS positive pulse
Trigger Pulse Width Minimum 250µS
Internal Reading Buffer up to 1,000 readings/sec into 64 readings buffer
Selectable lines PXI_TRIG1,2,3,4,5,6,7 and PXI_STAR
Isolation from DMM inputs ±330 V from any of the DMM 4 main inputs terminals
2.10.3 PXI Bus Hardware Trigger Output (to PXI J2)
Trigger Output TTL or CMOS negative pulse. Positive edge = ready
Trigger Pulse Width Approximately 140µS
Activity A single pulse is issued for each A/D conversion (at 10
or higher measurement rate)
Selectable lines PXI_TRIG1,2,3,4,5,6 and PXI_STAR
Isolation from DMM inputs ±330 V from any of the DMM 4 main inputs terminals
2.10.4 Analog Threshold Trigger
•Captures up to 64 readings
• Reading rate: 10 rps or higher
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Signametrics 16
2.11 Source Functions (SMX2044)
•Isolated to 300 V DC from the Chassis
•Current can be paralleled with multiple SMX2044s
• Voltage can be put in series with multiple SMX2044s
2.11.1 DC Voltage Source
Parameter Closed Loop [1] Open Loop
Output Voltage range -10.000 V to +10.000 V
Typical Current source/sink at 5V output 5 mA 5 mA
DAC resolution 18 bits 12 bits
Accuracy 23°C ±10°C One Year 0.015% ± 350 µV 1.0% ± 35 mV
Typical settling time 3 S (rate set to 2/s) 1 mS
Typical source resistance 250 Ω
[1] 10 rps or lower measurement rate is required for the closed loop mode.
2.11.2 AC Voltage Source
Parameter Closed Loop [1] Open Loop
Output Voltage, sine wave 50mV to 7.1 V RMS (0.14 to 20.0V peak-to-peak)
DAC resolution 16 bits 12 bits
Typical Current Drive at 3.5V RMS 3.5 mA RMS
Accuracy 18°C to 28°C One Year ACV spec ± 2 mV ACV spec + 0.8% ± 20 mV
Typical settling time (f-out > 40 Hz) 10 s (rate set to 2 rps) 1.5 s
Typical source resistance 250 Ω
Frequency range / resolution 2 Hz to 75 kHz / 2 Hz
Frequency stability 100 ppm ± 1 Hz
[1] 5 rps or lower measurement rate is required for the closed loop mode.
2.11.3 DC Current Source
Range Compliance Voltage Resolution [1] Minimum level Accuracy 23°C ±10°C One Year
1.25 µA 4.2 V 500 pA 1 ηA 1% + 10 ηA
12.5 µA 4.2 V 5 ηA 10 ηA 1% + 100 ηA
125 µA 4.2 V 50 ηA 100 ηA 1% + 500 ηA
1.25 mA 4.2 V 500 ηA 1 µA 1% + 5 µA
12.5 mA 1.5 V 5 µA 10 µA 1% + 50 µA
[1] Resolution without Trim DAC. The use of the Trim DAC can improve the resolution by a factor of 10, but it has
to be set separately since it is not calibrated.
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17 Signametrics
2.12 Accuracy Notes
Important All accuracy specifications for DCV, Resistance, DCI, ACV, and ACI apply for the time periods shown
in the respective specification tables. To meet these specifications, the System Calibration function must be
performed once a day. System Calibration is a simple software operation that takes a few seconds. Do it by
executing the DMMCalibrate() command, or selecting S-Cal in the control panel.
All three products are capable of continuous measurement as well as data transfer rates of up to 1,000 readings per
second (rps). To achieve the 6-1/2 digit resolution, the DMM should be operated at 5 rps or slower. The maximum
reading rate for 5-1/2 digits is 30 rps.
Accuracy vs. Reading Rates All of the above specifications apply to reading rates of 2 rps or lower. For higher
reading rates, increase the noise floor for DCV, Resistance, and DCI by the square root of the increase in reading
rate from 2 rps. For example, the noise floor for the 3.3 VDC range is 8 µV at 5 rps. At 20 readings per second, or
10x the reading rate, the noise increases by the square root of 10, or 3.16 times. The noise, then, at 20 readings per
second is ± 25 µV.
The noise characteristics for the AC functions increases by the same number as the DC functions. For example, the
noise floor for the 3.3 VAC, 20 rps, will have digit rattle of 8.7 mV vs. 2.75 mV at 2 rps.
Reading Rates vs. Noise Rejection The best AC (50 Hz, 60 Hz or 400 Hz) power line rejection is obtained at
reading rates that are whole number divisions greater than 1 of the line frequency, as shown in the following table.
For best AC line rejection you should use the reading rates checked. It is important to follow this table. Always use
the lowest checked rate that is practical for the application.
Reading Rate (rps) Power Line frequency
50 Hz 60 Hz 400 Hz
0.1 √√√
0.2 √√√
0.5 √√√
1 √√√
2 √√√
5 √√√
10 √√√
15
√
20
√√
25 √√
30
√
40
√
50 √√
60
√
80
√
100
√
200
√
400
√
Reading Rates vs. Digits of Resolution For reading rates of 10 readings per second (rps) and slower, the DMM
has 6 ½ digits of resolution. For reading rates from 10 rps to 30 rps, the DMM has 5 ½ digits of resolution.
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Signametrics 18
2.13 Other Specifications
Temperature Coefficient, All Functions Less than 0.1 x accuracy specification per °C
at
23C ±5°C
Reading Rate
(user selectable) •0.5 to 1,000 readings per second (rps)
•Up to 10 rps, 6 ½ digits
•Up to 30 rps, 5 ½ digits
Hardware Interface Single 3U PXI or CompactPCI slot
Overload Protection (voltage inputs) 330 VDC, 250 VAC
Isolation 330 VDC, 250 VAC from Earth Ground
Maximum Input (Volt x Hertz) 8x106Volt x Hz normal mode input (across Voltage HI &
LO).
1x106Volt x Hz Common Mode input (from Voltage HI or
LO relative to Earth Ground).
Safety Designed to IEC 1010-1, Installation Category II.
Calibration Calibrations are performed by Signametrics in a computer
with a 3°C internal temperature rise. All calibration constants
are stored in a text file.
Temperature Range -10°C to 70°C, operating
-65°C to +85°C, storage
Size
7” X 3.5” (Standard PXI/CompactPCI 3U format)
DMM Internal Temperature ±2°C
Measurement (SMX2042, 44)
Power +5 volts, 300 mA maximum
Note: Signametrics reserves the right to make changes in materials, specifications, product functionality, or
accessories without notice.
Accessories
Several accessories are available for the SMX2040 DMMs, which can be purchased directly from Signametrics, or
one of its approved distributors or representatives. These are some of the accessrories avaialble:
•DMM probes SM-PRB ($15.70)
•DMM probe kit SM-PRK ($38.50)
•Delux probe kit SM-PRD ($95.00).
•Shielded SMT Tweezer Probes SM-PRSMT ($24.90).
•Multi Stacking Double Banana shielded cable 36” SM-CBL36 ($39.00).
•Multi Stacking Double Banana shielded cable 48” SM-CBL48 ($43.00).
•Mini DIN Trigger, 6-Wire Ohms connector SM2040-CON7 ($14.00).
•LabView VI’s library SM204x.llb ($99.00).
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19 Signametrics
3.0 Getting Started
After unpacking the DMM, please inspect for any shipping damage that may have occurred, and report any claims
to your transportation carrier.
The DMM is shipped with the Digital Multimeter module; three floppy disks containing the various software panels
and drivers plus the calibration data specific for the unit, and this Operator's manual.
3.1 Setting the DMM
The SMX2040 series DMMs are PXI/CompactPCI Plug&Play devices and do not require any switch settings, or
any other adjustments to the DMM prior to installation. The only switches are the PXI trigger input and output
selection switches, capable of selecting one of the PXI triggers and PXI Start Trigger.
The SM40CAL.DAT file supplied with your DMM has a unique calibration record for that DMM (See
"Calibration" at the end of this manual.) When using multiple DMMs in the same chassis, the SM40CAL.DAT
file must have a calibration record for each DMM. Append the unique calibration records of each DMM into one
SM40CAL.DAT file using a text editor such as Notepad. The defalut location for the SM40CAL.DAT file is at
the root directory C:\.
3.2 Installing the DMM Module Warning
To avoid shock hazard, install the DMM only into a chassis that has its power line connector connected to an
AC receptacle with an Earth Safety ground.
After installation, check to see that no loose wires or ribbon cables infringe upon any of the internal circuits
of the DMM, as this may apply measurement voltages to your chassis, causing personal injury and/or
damage to your equipment!
This module is designed for 3U PXI and CompactPCI chassis. To prevent shock hazard do not plug it into
other format chassis such as 6U without making shure that all sides of the DMM are covered.
Caution: Only install the DMM module with the power to the chassis turned OFF!
Use extreme care when plugging the DMM module(s) into a PXI or CompactPCI chassis. If possible, choose an
empty slot away from any high-speed boards (e.g. CPU or other noisy modules) or the power supply. Please be
patient during the installation process! Due to it’s shielding it is a tight fit. Watch for any interference between
the module and the chassis. Gently push the DMM into the chassis, making shure the handle is correctly located.
Once in, lock it in with the handle and tighten the top and bottom screws to secure it into the chassis. Be patient!
3.3 Installing the DMM software package
To install the DMM, turn off the PXI/CompactPCI chassis, plug in the DMM into the PXI/CompcatPCI chassis,
preferably away from the CPU or any other noisy card, than turn on the power. The first time you power up your
computer with the DMM installed, your Windows system will detect the new DMM and will open the “New
Hardware found” wizard. It will prompt you for a driver. Insert Disk1 which contains the necessary driver.
To complete the installation, run the ‘SETUP’ program provided on the Diks1. This takes care of all installation
and registration requirements of the software. If you are installing the DMM on a computer that had an SMX2040
series install in it, you should first uninstall the old software. For a clean reintallation remove all INF files
containing reference to the Signametrics DMM. Dependig on operating system, these files will be located at
Windows\inf, Windows\inf\other or WINNT\inf. The files will be named Oemx.INF where x is 0,1,2,… and/or
SIGNAMETRICSSMX2040.INF. If present, these files will prevent “Found New Hardware” wizard from
detecting the new DMM. Also, make sure you backup and remove the old calibration record (C:\SM40CAL.DAT).
3.4 DMM Input Connectors
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