Keithley 2002/MEM2 – 8.5 Digit High Performance Multimeter with 128K Memory

Keithley 2002/MEM2 – 8.5 Digit High Performance Multimeter with 128K Memory

DMM users whose applications demand exceptional resolution, accuracy, and sensitivity combined with high throughput now have two attractive alternatives to high priced, high end DMMs. Keithley’s 8½-digit Model 2002/MEM2 High Performance Digital Multimeters not only deliver performance specifications usually associated with instruments that cost thousands more, but they also offer a broad range of functions not typically available from DMMs. The 2002/MEM2 is based on the same superior measurement technology, and the front panels of both instruments have the same look, feel, and response.

True 8½ Digit Resolution

While other DMMs may claim 8½-digit resolution, they must average multiple readings to extend their resolution. The resolution specifications of the 2002/MEM2 are based on a 28-bit A/D converter that provides the resolution needed to discern smaller changes. This higher resolution also provides greater dynamic range, making it possible to measure from 1µV to 20V on a single range, thus avoiding range-shift errors and delays.

High Accuracy ACV Measurements

A patented circuit design makes the 2002/MEM2 AC measurements several times more accurate than competitive DMMs. In this circuit, the signal bypasses the prime error-contributing section of conventional rms converters. This increases the accuracy at almost any voltage level, and also increases sensitivity down to a guaranteed 1% of the selected range, compared to 5–10% for most other DMMs. The result is highly accurate measurements over a broad range of inputs.

Applications involving vibration, servo, guidance, shock, and control systems often require accurate low frequency ACV measurements. The 2002/MEM2 maintain very good accuracy (better than 0.1%) down to 1Hz. The wide bandwidth of these DMMs allows for accurate measurements of high frequency AC signals without the need for a special AC meter. Both the 2002/MEM2 feature TRMS AC, average AC, peak AC, AC+DC, and crest factor measurement capability for a wide variety of applications.

High Speed for High Throughput

In applications where high throughput is critical, both the 2002/MEM2 provide more than 2000readings per second at 4½-digit resolution. At 8½ digits, the 2002/MEM2 maintains full rated accuracy a treading rates up to 44/second on DCV and ohms.

High Speed, High Precision Resistance Measurements

The Model 2002/MEM2 uses a unique single-phase method for 4-wire ohms measurements. This makes it twice as fast for a given power line cycle rate. This also eliminates errors due to changing lead resistances that can result from fast test handlers. A built-in open-lead detection circuit also eliminates many production test problems.

Fast, Flexible Triggering

Trigger latency-the delay between trigger and measurement-is often a barrier to higher through put. Also, variability in latency can complicate predicting measurement timing. The 2002/MEM2 trigger is less than 2µs±1µs, which is much faster than typical system DMMs.

8½-Digit High Performance Multimeter

2002/MEM2 provide exceptional measurement range. In addition, the 2002/MEM2 offers extended DCV and resistance measurement capabilities.

The unique Trigger-Link feature included in the Model 2002/MEM2 and most Keithley test and measurement products can be used to coordinate the operation of two or more instruments. Trigger-Link combines six independent software selectable trigger lines on a single connector for simple, direct control over all instruments in a system.

Spot Trends with the Bar-Graph Display

The ability to track reading trends around a target value easily can be just as important as the absolute readings. A unique bar-graph display function in the 2002/MEM2 indicates data as a percentage of the selected range from ±0.01% to ±100%. Whether adjusting about zero or any other desired value, this display can replace a nulling differential voltmeter.

Capture Spikes Down to 1µs

Both the 2002/MEM2 have internal peak detectors that can catch 1µs spikes such as power supply spikes and transients, AC line power surges, and short-duration dropouts on components. These peak detectors operate up to 1MHz for repetitive signals or down to 1µs for single spikes, so there is no need for a separate scope. The DMMs can automatically display and store the highest value or display the maximum and minimum values of spikes.

Built-in Features and Capabilities

The 2002/MEM2 offer many built-in measurements that are typically unavailable in instruments of this type, including in-circuit current, temperature with thermocouples or RTDs, and peak spikes. Four separate outputs linked to limits simplify configuring the DMMs for use in binning operations.

The built-in AC crest factor measurement helps ensure the accuracy of AC measurements. Other DMMs typically perform AC measurements for signals without excessive crest factor the ratio of peak value to rms values. However, when crest factor rises, measurements may not meet specs. With a 2002/MEM2, there is no need for an oscilloscope to determine if the crest factor is acceptable—the DMM measures it directly.

While some DMMs calculate average AC from the rms value, these calculations apply only to sine wave inputs. The 2002/MEM2 measure peak value, average and true rms directly to obtain a complete characterization of the signal. This capability makes these DMMs ideal for AC circuit design or test applications and for verifying test voltages specified only in averages.

When measuring AC or digital signals, frequency is critical. The 2002/MEM2 accurately measure frequency up to 15MHz. Accurate triggering on the signal is critical to measure frequency reliably. The frequency counters in the 2002/MEM2 have a fully adjustable trigger level for good measurements of noisy signals.

Multiple Measurement Display

The 2002/MEM2 can display DC and AC volts and the AC frequency from a single measurement connection simultaneously. Several other multiple-measurement displays are available, including crest factor and bar graph. By measuring sequentially and displaying simultaneously, the 2002/MEM2 operates as if three different meters are working together.

Option Slot Extends DMM Performance

An option slot in the back of the 2002/MEM2 opens the door to a wide range of measurement capabilities. Choose a 10-channel general-purpose scanner card or a 9-channel thermocouple scanner card to make measurements on multiple test points or devices. This can eliminate the need for a separate scanner and significantly reduce programming and setup time.