PDFINFO H5 58 0- 0 1
500 MHz, 4-Channel VXI
Oscilloscope
HP E1426A
Technical Specifications
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2-Slot, C-size, message based
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500 MHz bandwidth, 20 MSa/s digitizing rate
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64 KB shared RAM
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Automatic pulse parameter measurements
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Capture pre- or post-trigger events
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Recommended for repetitive signals
Description
The HP E1426A Digitizing Oscilloscope is a C-size,
2-slot, message-based VXI module. It has four
channels of 500 MHz bandwidth combined with stable
triggering and precise timebase circuitry to provide
accurate measurements with 8 bits vertical resolution.
Programmable attenuation settings provide sensitivities
from 8 mV full scale to 40 V full scale.
HP E1426A
This scope has random repetitive sampling, sometimes
referred to as equivalent time sampling. With this
technique, a high-speed track-and-hold circuit captures
the signal voltage and holds it until the lower-speed A/D
converter can digitize it. There are 64 Kbytes of shared
RAM available for segment storage.
The HP E1426A comes with both the SCPI command
set and an HP 54503A-compatible command set. The
compatible language provides a use model where
programs can be developed using the HP 54503A bench
oscilloscope. Using the HP 54503A provides direct
visual feedback to the programmer during program
development. Once programs have been developed on
the HP 54503A, they can be run on the HP E1426A with
only minor modifications.
The SCPI language is available for users who are more
familiar with SCPI. Not all of the complex triggering
capabilities of the HP 54503A and HP E1426A are
implemented in the SCPI language.
NOTICE: This product is targeted for
discontinuance December 1, 1999 due to lifetime
part issues.
Refer to the HP Website for instrument driver
availability and downloading instructions, as well as for
recent product updates, if applicable.
PDFINFO H5 58 0- 0 2
Random Repetitive Sampling
Sometimes referred to as equivalent time sampling,
random repetitive sampling is a technique in which a
high-speed track-and-hold circuit captures the signal
voltage and holds it until the lower-speed A/D converter
can digitize it. Acquisitions are repeated with many
points captured on each trigger until the entire
waveform is built up.
Due to the high-performance track-and-hold circuitry
and precise crystal-controlled timebase, this
architecture has the following advantages:
●
Very high repetitive bandwidth: 500 MHz bandwidth
on all four input channels
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Extremely fine time resolution: 20 ps timebase
resolution
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Very accurate timebase: 0.005% time-base accuracy
The repetitive sampling technique requires that the
input signal be repetitive, but it does not need to be
periodic. Signals with extremely low duty cycles can be
captured easily.
Very limited single-shot capability is available. The two
A/D converters operating at up to a 20 MSa/s digitizing
rate can capture two signals simultaneously. When
capturing a 2 MHz signal, this guarantees capturing 10
points or more per period.
HP E1426A/E1428A Common Features
Built-in Automatic Test Features
The user can choose from a variety of powerful
measurement features that are built into the HP E1426A
and HP E1428A, thus simplifying test program
development and improving test times. Nineteen
automatic pulse parameter measurements are available
in the box, freeing the controller from these
calculations. These measurements conform to IEEE
definitions. Maximum and minimum statistics on the
values of these measurements are also accumulated.
The following measurements are made at user-defined
thresholds or at the 10/90% or 50% voltage thresholds, as
defined by IEEE Std 194-1977: rise time, fall time,
frequency, period, +pulse width, –pulse width, duty
cycle, delay, volts ampl, volts base, volts top, volts p-p,
volts avg, volts max, overshoot, preshoot, volts min,
Vac rms, Vdc rms.
GO/NO-GO testing is provided by another built-in
feature: Measurement Limit Test lets the user set upper
and lower limits on any of the module’s automatic
measurements. If limits are exceeded, the violating
waveform and its data can be stored or transferred to
the controller.
In addition to the measurement limit test for GO/
NO-GO testing, the HP E1428A provides built-in
waveform compare test. With this feature,
a live signal
can be compared against a stored template.
Shared RAM On Board Eliminates Bus Transfer
Time
Shared RAM (HP E1426A: 64 KB; HP E1428A: 1 MB)
allows storage and retrieval of waveform data as well
as direct access to that data by the VXI controller or
other instrument modules. Since the controller operates
directly on the data in shared RAM, bus transfer of
waveforms can be eliminated. Up to 45 milliseconds of
bus transfer time can be saved.
Choice of Two Command Sets
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SCPI Command Set—Based on the industry standard
SCPI definitions for instrument programming.
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HP 54500-Compatible Command Set—Program the
HP E1426A like the HP 54503A, the HP E1428A like
the HP 54510B bench oscilloscopes.
PC-based Scope Control and Data Connectivity
The HP 54551A ScopeView PC Software (distributed
product
1
) lets you use your HP E1426A or HP E1428A
as a bench scope without writing any software. It gives
your VXI scope a full-featured front panel, along with a
live color waveform display. ScopeView lets you copy
displays as graphic images and waveform data files to a
variety of software packages for documentation and
analysis.
Developing a test system? ScopeView speeds your
learning and software development process by letting
you see and record the commands it uses to control
your scope. And you can use it as a powerful diagnostic
tool while integrating or troubleshooting your test
system.
For free demo software, contact Decision-Science
Applications Inc. at 719-593-5974, by fax at 719-593-5978,
or by EMAIL at scopeview@dsai.com.
(1) The HP 54551A is designed and manufactured by DecisionScience Applications Inc. (DSA) and sold and distributed
through Hewlett-Packard Company. HP has tested it and guarantees that the product meets published specifications. HP
provides a one-year warranty for the product.
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