Geotest SMX2042 PXI Bus 6 ½ Digit Multimetro Digital con Contador de Frecuencia y Capacitancia hasta 1000 readings/Sec

Applications

Programming

Features

Function	SMX2040 DMM	SMX2044 LCR Sourcing DMM
DCV 4 ranges, >10 GW and 10 MW input resistance	•	•
ACV 4 ranges, 1 M input	•	•
2-Wire Ohms, six ranges, 330 to 33 M	•	plus 33, 330 M
4-Wire Ohms, four ranges, 330 to 330 k	•	plus 33 range
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 nA to 1 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	•	•
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		•
6-wire Ohms (with force/sense)		•
Inductance, six ranges, 33 mH 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 (with external 1 Meg)		•
High Ohms range 1,000 Meg		•

6-wire Guarded Resistance Measurement (SMX2044)

The SMX2044 provides a guarded 6-wire resistance measurement method. It is used to make resistance measurements when the resistor-under-test has other shunting paths which can cause inaccurate readings. This method isolates the resistor-under-test by maintaining a guard voltage at a user defined node. Applications include in current test, Resistor Networks, etc.

Example: Assume a 30 k resistor is in parallel with two resistors (510 and 220 ), that are connected in series. By sensing the voltage at the top of the 30 k, and then applying this same voltage to the junction of the 510 and 220 there is no current flow through the shunting path. With this "guarding", the SMX2044 accurately measures the 30 k resistor.

Extended Resistance (SMX2044)

When utilizing the Leakage Measurement configuration, Use the following equation to derive the resistance being measured: R_x = V_s/I, where V_s is the DC voltage source, and I is the leakage current being measured. For example, if you set the leakage test voltage to 9.0V and measure 9 nA of leakage current, this corresponds to 1,000 M of resistance. This application is useful for testing cables, printed circuit boards, connectors and semiconductors.

Internal Temperature (SMX2044)

A special on-board temperature sensor allows monitoring of the DMM's internal temperature. This provides the means to determine when to run the self-calibration function (S-Cal) for the DMM, as well as predicting the performance of the DMM under different operation conditions. When used properly, this measurement can enhance the accuracy and stability of the DMM. It also allows monitoring of the PC internal temperature.

Capacitance Measurement (SMX2044)

The SMX2044 measures capacitance using a differential charge slew method, usable down to a few pF. With the exception of the 10 nF range, each of the ranges has a reading span from 5% of range to full scale. For testing surface mount parts, use the optional Signametrics SMT Tweezer probes.

Inductance Measurement (SMX2044)

The SMX2044 measures inductance using a precision AC source with a frequency range of 20 Hz to 75 kHz. Since inductors can vary greatly with frequency, you should choose the appropriate generator frequency. In addition to inductance, the inductor's Q factor is measured.

Sourcing Functions (SMX2044)

The SMX2044 adds a number of sourcing functions, giving great versatility for a variety of applications. All of the available sources, VDC, VAC, and IDC are isolated. This allows sourcing with a significant common mode voltage as well as the ability to connect several SMX2044 units in parallel for increased DC current, or in series for increased DC voltage.

Two D/A converters (DACs) are used for the source functions, a 12-bit DAC, and a Trim DAC. The last augments the 12-bit DAC to form a 16-bit composite DAC. For functions requiring high precision, use both DACs by selecting the ClosedLoop mode, otherwise only the 12-bit DAC is engaged.

Connections