Signametrics SMX2055 User manual

Operator's Manual

Model SMX2055 5-½ Digit Digital PXI Multimeter

January 2010 Driver compatibility: Rev 1.60

Signametrics 2

CAUTION

In no event shall Signametrics or its Representatives are 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 Signametrics 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.

reproduced in any form without the permission of Signametrics Corporation.

3 Signametrics

TABLE OF CONTENTS

1.0 INTRODUCTION.................................................................................................................................................5

1.1 SAFETY CONSIDERATIONS..........................................................................................................................5

1.2 MINIMUM REQUIREMENTS .........................................................................................................................5

1.3 FEATURE SET .............................................................................................................................................5

2.0 SPECIFICATIONS...............................................................................................................................................6

2.1 DC VOLTAGE MEASUREMENT ...................................................................................................................6

2.2 DC CURRENT MEASUREMENT....................................................................................................................7

2.3 RESISTANCE MEASUREMENTS....................................................................................................................7

2.3.1 2-wire.......................................................................................................................................7

2.3.2 4-wire.......................................................................................................................................7

2.4 AC VOLTAGE MEASUREMENTS..................................................................................................................7

2.4.1 AC Voltage True RMS Measurement.......................................................................................8

2.4.2 Additional Errors Due To Signal Frequency...........................................................................8

2.5 AC CURRENT MEASUREMENT,TRUE RMS................................................................................................8

2.5.1 AC Current True RMS Measurement.......................................................................................8

2.5.2 Additional Errors Due To Current Frequency ........................................................................9

2.6 DIODE TEST FUNCTION ..............................................................................................................................9

2.7 MEASUREMENT RATES AND POWER LINE REJECTION..................................................................................9

2.8 ACCURACY NOTES ...................................................................................................................................10

2.9 OTHER SPECIFICATIONS ...........................................................................................................................10

3.0 GETTING STARTED.........................................................................................................................................12

3.1 SETTING THE DMM..................................................................................................................................12

3.2 INSTALLING THE DMM MODULE .............................................................................................................12

3.3 INSTALLING THE SOFTWARE.....................................................................................................................12

3.4 DMM INPUT CONNECTORS ......................................................................................................................13

3.5 STARTING THE CONTROL PANEL ..............................................................................................................13

3.5 USING THE CONTROL PANEL....................................................................................................................14

4.0 DMM OPERATION AND MEASUREMENT TUTORIAL...........................................................................16

4.1 VOLTAGE MEASUREMENT........................................................................................................................16

4.1.1 DC Voltage Measurements ....................................................................................................16

4.1.2 True RMS AC Voltage Measurements ...................................................................................16

4.2 CURRENT MEASUREMENTS ......................................................................................................................17

4.2.2 Improving DC Current Measurements ..................................................................................18

4.3 RESISTANCE MEASUREMENTS..................................................................................................................18

4.3.1 2-Wire Ohm Measurements ...................................................................................................18

4.3.2 4-Wire Ohm Measurements ...................................................................................................19

4.3.6 Effects of Thermo-Voltaic Offset............................................................................................19

4.8 DIODE CHARACTERIZATION .....................................................................................................................20

5.0 WINDOWS INTERFACE..................................................................................................................................20

5.1 DISTRIBUTION FILES ................................................................................................................................21

5.2 USING THE SM2060 DRIVER SET WITH C++ OR SIMILAR SOFTWARE......................................................23

5.2.1 Multiple Card Operations under Windows............................................................................23

5.3 VISUAL BASIC FRONT PANEL APPLICATION.............................................................................................24

5.3.1 Visual Basic Simple Application............................................................................................25

5.4 WINDOWS DLL DEFAULT MODES AND PARAMETERS..............................................................................25

5.5 USING THE SM2060 DLL WITH LABWINDOWS/CVI............................................................................26

5.6 WINDOWS COMMAND LANGUAGE ...........................................................................................................26

DMMCalibrate................................................................................................................................27

DMMCleanRelay ............................................................................................................................27

DMMClearMinMax ........................................................................................................................28

Signametrics 4

DMMClosePCI ...............................................................................................................................28

DMMDelay .....................................................................................................................................29

DMMErrString................................................................................................................................29

DMMGetBusInfo.............................................................................................................................30

DMMGetCalDate............................................................................................................................30

DMMGetdB.....................................................................................................................................31

DMMGetdBStr................................................................................................................................31

DMMGetDeviation .........................................................................................................................32

DMMGetDeviatStr..........................................................................................................................33

DMMGetDiffMnMxStr....................................................................................................................33

DMMGetFunction...........................................................................................................................34

DMMGetGrdVer.............................................................................................................................34

DMMGetHwVer..............................................................................................................................35

DMMGetID.....................................................................................................................................35

DMMGetManDate..........................................................................................................................36

DMMGetMax..................................................................................................................................36

DMMGetMaxStr .............................................................................................................................37

DMMGetMin...................................................................................................................................37

DMMGetMinStr..............................................................................................................................38

DMMGetRange...............................................................................................................................38

DMMGetRate..................................................................................................................................39

DMMGetType .................................................................................................................................39

DMMGetVer ...................................................................................................................................40

DMMInit .........................................................................................................................................41

DMMIsAutoRange ..........................................................................................................................41

DMMIsInitialized............................................................................................................................42

DMMIsRelative...............................................................................................................................42

DMMOpenPCI................................................................................................................................43

DMMRead.......................................................................................................................................43

DMMReadNorm..............................................................................................................................44

DMMReadStr..................................................................................................................................45

DMMSetAutoRange ........................................................................................................................45

DMMSetFunction............................................................................................................................46

DMMSetRange................................................................................................................................46

DMMSetRate...................................................................................................................................47

DMMSetRelative.............................................................................................................................48

DMMTerminate...............................................................................................................................48

5.7 CALIBRATION SERVICE COMMANDS.........................................................................................................49

AC_zero ..........................................................................................................................................49

DMMLoadCalFile...........................................................................................................................49

GetGain...........................................................................................................................................50

GetOffset.........................................................................................................................................50

SetFcomp ........................................................................................................................................51

SetOffset..........................................................................................................................................52

Linearize_AD..................................................................................................................................52

Read_ADcounts ..............................................................................................................................53

5.8 MAINTANANCE COMMANDS.....................................................................................................................54

GrdXingTest....................................................................................................................................54

5.9 ERROR CODES ..........................................................................................................................................54

5.10 WARNING CODES ...................................................................................................................................55

5.11 PARAMETER LIST ...................................................................................................................................55

5.11.1 Measurement and Source Functions....................................................................................55

5.11.2 Range Values .......................................................................................................................55

5.11.3 Measurement Rate parameters ............................................................................................56

6 CALIBRATION .....................................................................................................................................................57

7.0 WARRANTY AND SERVICE...........................................................................................................................59

8.0 ACCESSORIES...................................................................................................................................................59

1.0 Introduction

Congratulations! You have purchased a PXI/CompactPCI Plug-in Digital Multimeter. The SMX2055 Digital

Multimeters (DMM’s) 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 DMM’s, please take a few moments and review this

manual before installing and using this precision instrument.

This manual describes the SMX2055 PXI/cPCI module.

1.1 Safety Considerations

Safety Considerations

The SMX2055 DMM is capable of measuring up to 240 VDC or 240 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 PC

trapped inside the DMM.

The DMM comes installed with four shields (bottom, top and two edge strips) 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 PC. Be sure to check your installation before

closing the cover on your personal computer.

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 computer!

To avoid shock hazard, install the DMM only into a computer 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 accessory with the

Signametrics DMM’s.

1.2 Minimum Requirements

The SMX2055 DMM’s are precision plug-in modules that are compatible with IBM type personal computers (PCs),

PXI and cPCI chassis. It requires as a minimum a Pentiums computer. They require a half-length expansion slot on

the PCI bus or 3U PXI slot. A mouse must be installed when controlling the DMM from the Windows Control

Panel. The SMX2055 comes with a Windows' DLL, for operation with Windows' Version 95/98/Me/2000/XP and

NT4.0.

1.3 Feature Set

The SMX2055 is a traditional 5-1/2 digit DMM and it can be used as a general purpose DMM. The High Workload

Multi Function SM2064 adds timing, capacitance, inductance, sourcing and a lot more speed. With its specialized

measurements, it can replace some costly instruments, shrinking the size and cost of a test system.

5 Signametrics

Signametrics 6

SMX2055 basic features:

Volts DC; for ranges, 240mV to 240V

Volts AC; Tru RMS; four ranges, 240mV to 240V

2-Wire Ohms, six ranges 240 to 24 M

4-Wire Ohms, five ranges 240 to 2.4 M

DC current, four ranges 2.4 mA to 2.4 A

AC current, four ranges 2.4 mA to 2.4 A

Diode V/I characteristics at 100 A to 1mA

Auto range, Relative, Min, Max, dB, %deviation operations

High Dynamic range; ±240,000 counts (240.000V)

Selectable measurement rate: 1 to 100 readings/sec

2.0 Specifications

The following specifications are based on both, verification of large number of units as well as

mathematical evaluation. They should be considered under the environment specified.

It is important to note that a DMM specified range is expressed as a numeric value indicating the highest

absolute measurement that can be displayed using the range. The lowest value that can be detected is

expressed by the corresponding resolution for the range.

2.1 DC Voltage Measurement

Input Characteristics

Input Resistance 240 mV, 2.4 V Ranges: >10 G, with typical leakage of 50pA

Input Resistance 24 V, 240 V Ranges: 10.00 M

Accuracy ± (% of reading + Volts) [1]

Range Full Scale

5-½ Digits Resolution One Year 23C 10C

240 mV 240.000 mV 1 V 0.015 + 7 V

2.4 V 2.40000 V 10 V 0.014 + 30 V

24 V 24.0000 V 100 V 0.02 + 750 V

240 V 240.000 V 1 mV 0.02 + 3 mV

[1] With measurement rate set to 2rps or lower rate, within one hour from Zero (Relative control).

For resolution at higher measurement rates, see the following table. Use this table for DC Volts, DC

current and Resistance measurements.

Maximum reading rate

Resolution

2 / second 5-1/2 digits 19 bits

8 / second 5 digits 18 bits

50 / second 4-1/2 digits 17 bits

100 / second 4 digits 16 bits

DCV Noise Rejection Normal Mode Rejection, at 50, 60, or 400 Hz ± 0.5%, is better than 95 dB

for Rates of 6rps and lower. Common Mode Rejection (with 1 klead imbalance) is better than 120

dB for these conditions.

7 Signametrics

2.2 DC Current Measurement

Input Characteristics

Number of built-in shunts Two

Currents greater than 2.4A require external shunt

Protected with 2.5A Fast blow fuse

Accuracy ± (% of reading + Amps) [1]

Range Full Scale

5-½ Digits Resolution Max Burden

Voltage One Year 23C 10C

2.4 mA 2.40000 mA 10 A 25mV 0.07 + 7 A

24 mA 24.0000 mA 100 A 250mV 0.08 + 9 A

240 mA 240.000 mA 1 A 55mV 0.07 + 60 A

2.4 A 2.40000 A 10 A 520mV 0.2 + 160 A

[1] With measurement rate set to 2rps or lower rate, within one hour from Zero (Relative control).

2.3 Resistance Measurements

2.3.1 2-wire

Accuracy ± (% of reading + ) [1]

Range [2] Full Scale

5-½ Digits Resolution Test

current One Year

23C 10C

240 240.000 1 m1 mA 0.02 + 100 m

2.4 k2.40000 k10 m1 mA 0.02 + 200 m

24 k24.0000 k100 m100 A 0.02 + 1 

240 k240.000 k1 10 A 0.06 + 20 

2.4 M2.40000 M10 1 A 0.06 + 200 

24 M24.0000 M100 100 nA 0.2 + 25 k

[1] With measurement rate set to 2rps or lower rate, within one hour from Zero (Relative control).

[2] Test voltages are 2.4V max with the exception of the 240 ranges 240 mV.

2.3.2 4-wire

Accuracy ± (% of reading + ) [1]

Range [2] Full Scale

5-½ Digits Resolution Source

current One Year

23C 10C

240 240.000 1 m1 mA 0.02 + 50 m

2.4 k2.40000 k10 m1 mA 0.02 + 100 m

24 k24.0000 k100 m100 A 0.02 + 500 m

240 k240.000 k1 10 A 0.06 + 10 

2.4 M2.40000 M10 1 A 0.06 + 200 

[1] With measurement rate set to 2rps or lower rate, within one hour from Zero (Relative control).

[2] Test voltages are 2.4V max with the exception of the 240 ranges 240 mV.

2.4 AC Voltage Measurements

Input Characteristics

Input Resistance 1 M, shunted by < 300 pF, all ranges

Max. Crest Factor 4 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

Typical Settling time Fast RMS < 0.05 sec to within 0.1% of final value

Signametrics 8

2.4.1 AC Voltage True RMS Measurement

Accuracy ± (% of reading + Volts) [1]

Range Full Scale

5-½ Digits [3] Resolution Lowest specified

Input Voltage One Year [2]

23C 10C

240 mV 240.000 mV 1 V 5 mV 0.15 + 150V

2.4 V 2.40000 V 10 V 20 mV 0.25 + 10mV

24 V 24.0000 V 100 V 200 mV 0.15 + 100mV

240 V 240.000 V 1 mV 2 V 0.25 + 400mV

[1] With measurement rate set to 2rps or lower rate

[2] Input frequency 47Hz to 10kHz. For other frequencies add error in tabel below

[3] Signal is limited to 8x106Volt Hz Product

2.4.2 Additional Errors Due To Signal Frequency

Add the following error to the above values for signal frequencies lower than 47Hz or greater than 10kHz

Range Signal Frequency % of reading + Volts [1]

20 Hz - 47 Hz 0.8 + 50V

240 mV

10 kHz - 50 kHz 0.48 + 80V

20 Hz - 47 Hz 0.75 + 1mV2.4 V

10 kHz - 50 kHz 0.45 + 2mV

20 Hz - 47 Hz 0.85 + 20mV24V

10 kHz - 50 kHz 0.2 + 15mV

20 Hz - 47 Hz 0.85 + 200mV240V

10 kHz - 50 kHz 0.15 + 100mV

[1] Select measurement rates that are lower than 1/10th of the signal frequency.

ACV Noise Rejection Common Mode rejection, for 50 Hz or 60 Hz with 1 kimbalance in either lead, is better

than 80 dB.

2.5 AC Current Measurement, True RMS

Input Characteristics

Crest Factor 4 at Full Scale

Number of built-in shunts Two

Currents greater 2.4A require external shunt

Protected with 2.5A Fast blow fuse

2.5.1 AC Current True RMS Measurement

Accuracy ± (% of reading + Amps) [1]

Range Full Scale

5-½ Digits Resolution Lowest Specified

Current Max Burden

Voltage One Year 23C 

10C [2]

2.4 mA 2.40000 mA 10 A 60 A 25mV 0.3 + 20 A

24 mA 24.0000 mA 100 A 300 A 250mV 0.2 + 100 A

240 mA 240.000 mA 1 A 3 mA 55mV 0.17 + 1 mA

2.4 A 2.40000 A 10 A 30 mA 520mV 0.31 + 10 mA

[1] With measurement rate set to 2rps or lower rate

[2] Input frequency 47Hz to 1kHz. For other frequencies, see tabel below

9 Signametrics

2.5.2 Additional Errors Due To Current Frequency

Range Signal Frequency [1] % of reading

20 Hz - 47 Hz 0.882.4 mA

1 kHz - 10 kHz 0.12

20 Hz - 47 Hz 0.8424 mA

1 kHz - 10 kHz 0.24

20 Hz - 47 Hz 0.8240 mA

1 kHz - 10 kHz 0.2

20 Hz - 47 Hz 0.552.4 A

1 kHz - 10 kHz 0.2

[1] All AC Current ranges have typical measurement capability of at least 20 kHz

2.6 Diode Test Function

Test Currents Five

Current sources voltage compliance 4 V

Accuracy ± (% of reading + Volts) [1]

Range Full Scale

5-½ Digits Resolution One Year 23C 10C

0.1 A 0.022 + 15 V

1 A 0.018 + 12 V

10 A 0.015 + 10 V

100 A 0.014 + 8 V

1 mA

2.40000 V 10 V

0.014 + 8 V

[1] With measurement rate set to 2rps or lower rate

2.7 Measurement Rates and power line rejection

Use DMMSetRate() using the following codes.

Power line RejectionRate

(Readings/sec) Symbol Code

50Hz 60Hz 400Hz

1 RATE_1 1



2 RATE_2 2



3 RATE_3 3



7 RATE_7 7



14 RATE_14 14



27 RATE_27 27



55 RATE_55 55



100 RATE_100 100



Signametrics 10

2.8 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, Self Calibration must be performed once a day or

as indicated in the specification table. This is a simple software operation that takes a few seconds. It can be

performed by calling Windows command DMMCal(), or selecting S-Cal in the control panel.

These products are capable of continuous measurement as well as data transfer rates of up to 100 readings per

second (rps). In general, to achieve 5-1/2 Digits of resolution, the rate should be set to 2rps or lower.

2.9 Other Specifications

Temperature Coefficient over 0C to 50C Range

Less than 0.1 x accuracy specification per C At 23C 10C

Hardware Interface Single PXI/cPCI 3U slot

Overload Protection (voltage inputs) 300 VDC, 250 VAC

Isolation 300 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 at

23C internal temperature rise. All calibration constants are

stored in a text file.

Temperature Range Operating -10C to 65C

Temperature Range Storage -40C to 85C

Size Single 3U PXI or CompactPCI slot

Power +5 volts, 200 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 SM2060 series DMM’s, which can be purchased directly from

Signametrics, or one of its approved distributors or representatives. These are some of the accessories available:

DMM probes SM-PRB ($15.70)

DMM probe kit SM-PRK ($38.50)

Deluxe probe kit SM-PRD ($95.00).

Shielded SMT Tweezers Probes SM-PRSMT ($24.90).

Multi Stacking Double Banana shielded cable 36” SM-CBL36 ($39.00).

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