KEI
2001 Digital Multimeter, 7.5 Digits
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 71/2-digit
Model 2001 and 81/2-digit Model
2002 High Performance Digital Multimeters deliver
performance specifications usually associated only
with instruments that cost thousands more.
True
71/2- (or 81/2-)
Digit Resolution
The resolution specifications of the 2001 and
2002 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 and avoid range-shift errors.
10
Channel Option
With the addition of a plug-in scanner card, it
becomes a complete scan and measure system for applications
involving up to ten measurement points. The additional
resolution and measurement ranges provided by the
2002 make it an excellent choice for production test,
design verification, and metrology applications where
high accuracy is critical.
High
Accuracy ACV Measurements
A patented circuit design makes the 2001 and 2002’s
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 not only increases the accuracy at almost any
voltage level, but 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 input
signals.
Applications involving vibration, servo, guidance,
shock, and control systems often require accurate
low-frequency ACV measurements.
The 2001 and 2002 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 2001 and 2002 feature TRMS AC, Average AC,
Peak AC and AC+DC measurement capability for a wide
variety of applications.
High
Speed for High Throughput
In applications where high throughput is critical,
both the 2001 and 2002 will provide more than 2000
readings per second at 41/2-
digit resolution. At 71/2- digits,
the 2002 maintains full rated accuracy at reading
rates up to 44/second on DCV and ohms.
High
Speed, High Precision Resistance Measurement
The Model 2002 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
throughput. Also, variability in latency can complicate
predicting measurement timing. The 2001 and 2002 trigger
in less than 2µs ±1µs, which is
100–1000 times faster than other DMMs.
The unique Trigger-Link feature included in the Model
2001 and 2002 and a growing number of other 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.
Capture
Spikes Down to 1µs
Both the 2001 and 2002 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’s no need for a separate
scope. The DMMs will automatically display and store
the highest value or display the maximum and minimum
values of spikes.
Built-in
Features and Capabilities
The 2001 and 2002 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.
Built-in AC crest factor measurement helps ensure
the accuracy of AC measurements.
The 2001 and 2002 allow measuring 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.
The 2001 and 2002 accurately measure frequency up
to 15MHz. Accurate triggering on the signal is critical
to measure frequency reliably. The frequency counters
in the 2001 and 2002 have a fully adjustable trigger
level for good measurements of noisy signals.
Multiple
Measurement Display
The 2001 and 2002 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.
Option
Slot Extends DMM Performance
An option slot in the back of the 2001 and 2002
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. The Model 1801
Nanovolt Preamp extends the performance of either
DMM by extending the low-level measurement ranges,
and amplifies the voltage sensitivity dramatically.
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