LeCroy 9400A Manual page 12

FEATURES
SPECIFICATIONS
High bandwidth and precision - Two independent
channels, each with 175 MHz bandwidth and a high-
performance 8-bit ADC, handle input signals with
better than +2% DC accuracy (_+1% optional). The
9400A features sampling rates of 100 megasamples/
sec for transient events. Long memories and a
versatile cursor system (including voltage, time and
cross-hair cursors), give time measurements with an
accuracy of_+0.02% of the time-base setting, and reso-
lution of +0.002% full scale.
High-resolution display-The 9400A's large display
screen produces bright, stable, razor-sharp pictures of
your signal under any repetition rate conditions. Very
accurate signal comparisons are possible as up to four
waveforms (live, expanded or processed) can be dis-
played simultaneously on the high-resolution screen
(1024 x 1024 pixels).
Long memories-The long 32K acquisition memories
of the 9400A Digital Oscilloscope capture waveforms
with high fidelity. At similar time-base settings, the
9400A's long memories allow sampling rates up to 25
times faster than that of instruments which have only
1K of acquisition memory (see graph below). Faster
sampling rates ensure higher single-shot bandwidth
as well as significantly reducing problems caused by
undersampling and aliasing. The 9400A's long memo-
ries allow displayed waveforms to be expanded up to
100 times to show the finest signal details.
Transient recording - With a sampling rate of 100
megasamples/sec, the 9400A is an extremely powerful
transient recorder. Long 32K data point acquisition
memories, combined with a continuously adjustable
trigger (from 100% pre-trigger to 10,000 divisions
post-trigger at any time-base setting), ensure that rare
events cannot be missed. Both channels are sampled
simultaneously so that exact time correlation is main-
tained between channels.
Full programmability - All the 9400A's front-panel
controls are fully programmable via the two RS-232-C
interface ports or the GPIB port. A single push-button
initiates a screen dump for accurate color hard copies
of the display via a wide range of digital plotters. The
GPIB comes complete with LeCroy "MASP" software
offering computer control and mass storage on any PC
compatible with the IBM ® standard.
Signal processing - The waveform processing op-
tions extend the applications of the 9400A to high
bandwidth signal characterization, as well as mathe-
matical and spectral analysis. The routines include
averaging (summed and continuous), smoothing, inte-
gration, differentiation, square, square-root, full
arithmetic, FFT spectral analysis, and Extrema moni-
toring.
Mass storage and remote control - A sophisticated
mass storage and remote control package is available
to assist users involved in automated and computer-
aided testing. Convenient portability for field applica-
tions is also provided by a lap-top computer.
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TIME BASE SETTING
(sec/div)
Single-shot bandwidth is a function of sampling rate. Long memories enable higher sampling rates at equal time-base settings. Above, the 9400A
(solid line) is compared to oscilloscopes with 1K (dotted line) and 512 points (dashed line) of memory. At slower time-base settings, the single-shot
bandwidth of the 9400A, expressed as Nyquist frequency, is typically 25 times higher than in oscilloscopes with 1K memory and 50 times higher than
in those with only 512 points.
VERTICAL ANALOG SECTION
Bandwidth (- 3 dB):
@ 50 ~: DC - 175 MHz at 10 mV/div, up to 225 MHz
at 1V/div;
DC - 150 MHz at 5 mV/div.
@ 1 M~ AC: < 10 Hz - 100 MHz typical.
@ 1 M~ DC: DC - 100 MHz typical.
Single shot: DC - 50 MHz (Nyquist).
Input impedance: 1 M~//50 pF and 50 ~ +_ 1%.
Channels: Two; standard BNC connector inputs.
Sensitivity range: 5 mV/div to 1 V/div at 50 ~ impedance
and 5 mV/div to 5 V/div at 1 M~ impedance; detents at
1-2-5, 1 : 2.5 continuously variable.
Offset: _+ 8 divisions in 0.04 division increments.
DC accuracy: Standard < + 2%, optional _< + 1%.
Noise: _< 0.45% RMS.
Bandwidth limiter (- 3 dB): 30 MHz.
Max input voltage: 250 V (DC + peak AC) at 1 M~, 5 V
(500 mW) or _+ 10V peak AC at 50
VERTICAL DIGITAL SECTION
ADCs: One per channel, 8-bit flash.
Conversion rate: Up to 100 megasamples/sec for transient
signals, up to 5 gigasamples/sec for repetitive signals, simul-
taneously on both channels.
Aperture uncertainty: + 10 psec.
Overall dynamic accuracy (typical): Sine wave applied to
the BNC input for RMS curve fit at 80% full scale. The accu-
racy measurement includes the front-end amplifier, sample
& hold and ADC.
Input frequency Nyquist
(MHz) 1.0 10.0 50.0 100.0 175.0
Signal-to-noise
ratio (dB)
41.9 41.9 41.9 37.1 29.9
Effective bits 7.0 7.0 7.0 6.2 5.0
Acquisition memories, Channels 1 and 2: Two, 32K 8-bit
word memories (64K total) which can be segmented into
15, 31,62, 125 or 250 blocks.
Reference memories, C and D: Two, 32K, 16-bit word me-
mories (64K total) which can store two acquired and/or
processed waveforms.
Function memories E and F (optional): Two 32K, 16-bit
word memories (64K total) for waveform processing.
Glitch detection: Permanent glitch detection for events
clown to 0.04% of the time-base setting, 10 nsec minimum.
HORIZONTAL SECTION
Time Base
Range: 2 nsec/div to 100 sec/div.
Accuracy: Better than + 0.002 % of the time-base setting.
Interpolator resolution: 10 psec.
Acquisition Modes
Random Interleaved Sampling (RIS) for repetitive signals
from 2 nsec/div to 2 ~sec/div;
Single shot for transient signals and repetitive signals from
50 nsec/div to 200 msec/div;
Roll for slowly-changing signals from 500 msec/div to
100 sec/div;
Sequence for capturing transients in segmented memories
of 8, 15, 31,62,125 or250 blocks.
Trigger
Sources: CHAN1, CHAN2, LINE, EXT, EXT/10.
Slope: Positive, negative, window.
Coupling: AC, LF RE J, HF RE J, DC.
Modes:
Sequence: stores multiple events in segmented acquisi-
tion memories.
Auto: automatically re-arms after each sweep. If no trig-
ger occurs, one is generated at 2 Hz repetition rate.
Normal: re-arms after each sweep. If no trigger occurs
after 2 sec, the display is erased.
Single (hold): holds display after a trigger occurs. Re-
arms only when the "single" button is pressed again.
Pro-trigger: Adjustable in 0.2% increments, to 100%.
Post-trigger delay: Adjustable in 0.02 division increments
up to 10,000 divisions.
External trigger input: 1M~, < 30pE 250V max., + 2V in
EXT, + 20V in EXT/10.
Rate: > 200 MHz.
SELF TESTS
Auto-calibration: Performed every 20 minutes or wheneve
the gain or time-base parameters are changed; provides
accuracies of:
DC gain: + 2% (+ 1% optional) of full scale;
Offset: + 0.5% of full scale (50~ only);
Time: 20 psec RMS.
During the warming-up period, auto-calibration is carried OL
at 1 minute intervals unless the oscilloscope is in single or
sequence trigger mode.
DISPLAY
CRT: 12.5 ×17.5 cm (5 x 7 inches); magnetic deflection; vec
tor graphics system.
Resolution: 1024 x 1024 addressable points.
Grid: Internally generated; separate intensity control for gric
and waveforms. Single and dual grid mode.
Expansion: Dual zoom horizontal expansion operates simu
taneously on live, stored and processed waveforms,
expanding up to 100 times. Vertical expansion from 0.4 up tc
2 times for non-processed waveforms, up to 10 times for
processed waveforms.
Screen dump: Single or multi-pen digital plotters are menu
selected. The 9400A supports the HP 7400 series, as well a,
the Tektronix 4662, Philips PM 8151, Graphtek WX 4638/6.
and compatible models. Screen dumps are activated by a
front-panel push-button.
Cursors: Two time cursors give time resolution of _+ 0.2% c
full scale for unexpanded traces; up to +_ 0.002% for expan-
ded traces. The corresponding frequency information is alsc
provided. Two voltage cursors measure voltage differences
to 0.2% of full scale for each trace.
A cross-hair marker measures absolute voltage versus
signal ground as well as the time relative to the trigger.