SIGNAL ANALYZERS
Spectrum Analyzer 20 Hz to 40 MHz
HP 3585B
New sweep gating option
80-100 dB dynamic range
±0.25 dB typical level accuracy
Uncompromising Baseband Signal Analysis
The HP 3585B spectrum analyzer delivers high performance
where it counts - at baseband frequencies. With unmatched
accuracy, resolution, and dynamic range, the HP 3585B is the best
solution for signal analysis at the critical frequencies comprising
voice, picture, or digital information.
In today's high-speed, high-density information processing systems, maintaining the integrity of data signals requires more measurement performance than ever before. The HP 3585B provides
80-100 dB of spurious-free dynamic range, a sharp 3 Hz resolution
bandwidth, and a 20 Hz—40.1 MHz frequency range to easily cover
most information bandwidths. Fully synthesized tuning (including
sweeps) and typical amplitude accuracy to ±0.25 dB are unique in
this frequency range and ensure complete measurement confidence.
Measurement performance is critically important at baseband frequencies because signal degradation occurring here is typically not
recoverable elsewhere in the system. As a result, test requirements
for baseband signals and circuits often demand a level of performance
that only a high-performance, low-frequency signal analyzer such as
the HP 3585B can provide.
Carefully Chosen Features for Better Measurements
Measurements are faster and easier with the optimized featured
set. The automatic limit test function checks all 1000 measurement
points against user-defined upper and lower limits in a fraction of a
second. Pass/fail results are shown in the display and are available
over HP-IB for improved productivity in automated applications.
The automatic peak search and signal track functions speed signal
identification and analysis and make examination of drifting signals
more convenient. In addition to locating the strongest signal in a display, the peak search function can also find successively smaller signals, or search to the right or left for peaks above a user-defined
threshold.
Fast, Flexible Frequency Sweeps
Well-designed filters and a phase-continuous, synthesized local
oscillator team up with exceptional dynamic range to give the
HP 3585B very fast measurement speeds. A 40 MHz sweep using the
30 kHz resolution bandwidth takes only 200 milliseconds, fast enough
for high resolution spectrum surveillance. A 1 MHz sweep using a
1 kHz bandwidth takes only 2 seconds, yet yields an average noise
floor of-85 dBc.
50, 75, 1 M inputs
3 Hz resolution bandwidth
Automatic limit testing
Powerful Marker Functions
The tunable marker readout of frequency and amplitude can be
expressed as an absolute or relative (offset) value. For offset measurements, a reference point is selected and all measurements are displayed relative to this value. Offset measurements are especially
useful when comparing various spectral component levels to a carrier
in modulation analysis or when determining signal-to-noise ratio.
With a single keystroke, the marker value can be entered as the
center frequency, reference level, frequency span, or center frequency
step size. This improves accuracy and efficiency in manual testing and
reduces setup errors.
The built-in frequency counter provides additional accuracy when
measuring the frequency of a signal in the display. Results are provided in 0.3 seconds to 0.1 Hz resolution. Because the counter function is
combined with the selectivity of the analyzer, it is possible to accurately measure small signals in the vicinity of much larger ones.
For noise measurements, the noise level marker function displays
averaged rms noise density at the marker position, normalized to a
standard 1 Hz bandwidth and corrected for the analyzer's characteristics. This function can be combined with the relative measurement
mode for fast, easy signal-to-noise ratio measurements.
Measurement Hard Copy
Copying a complete display to a printer or plotter is as easy as
pressing a button. The HP 3585B directly controls HP-GL compatible HP-IB plotters and graphics printers such as the HP Thinkjet
printer.
Tracking Generator
The standard 50 tracking generator covers the full 40 MHz frequency range of the HP 3585B to provide easy scalar (amplitudeonly) network analysis. The signal is fully synthesized in CW
measurements and sweeps and level is adjustable from 0 dBm to
—11 dBm on the front panel.
Flexible inputs with Autoranging
50, 75, and 1 M input impedances are all standard and are elec-
tronically selectable to match your system. For sensitive circuits, the
50 and 1 M inputs and provided probe power offer maximum compatibility with a variety of passive and active probes. With input
autoranging, the HP 3585B automatically chooses the optimum input
range for maximum dynamic range and lowest distortion. This eliminates the need to manually adjust attenuation and IF gain.
Compatibility
Hewlett-Packard protects your investment in measurement solutions. The HP 3585B can directly replace the HP 3585A in virtually
every application. The HP 3585B meets all HP 3585A specifications
and uses an expanded version of the HP 3585A programming codes.
Physical dimensions are identical, and input and output are in the
same location, serving the same functions.
SIGNAL ANALYZERS
Spectrum Analyzer 20 Hz to 40 MHz (cont'd)
HP 3585B
Distortion Measurements
The dynamic range, resolution, and level accuracy of the HP
3585B make harmonic and intermodulation distortion measurements
a straightforward task. The peak search function quickly locates the
fundamental and each distortion product, and the automatic limit test
function can be used for immediate pass/fail results. Resolve and
measure closely-spaced intermodulation products with resolution
bandwidths as narrow as 3 Hz. The fully synthesized local oscillator
provides the frequency accuracy and stability necessary to make de-
pendable measurements on closely-spaced signals, and to measure
distortion products directly with the narrowest bandwidths.
Burst Signal Analysis
Spectrum analysis results from traditional swept measurements on
burst signals include not only the signal of interest, but also the c
signal from the burst repetition period. The noise floor is higher in
burst measurements, which masks the signal of interest. Accurate sig-
nal-to-noise and carrier-to-noise measurements are impossible. The
new sweep gating option 001 reveals the signals you have missed.
Network Analysis
Gain, loss, and frequency response measurements are dependable
and automatic with the built-in synthesized tracking generator.
Superb amplitude accuracy, resolution, and flatness contribute to
high-quality measurements. The HP 3585B has multiple input impedances to match the network under test and a broad selection of
receiver bandwidths to provide the best balance of measurement
speed and dynamic range. Use the limit test function to save analysis
time and effort with its immediate, automatic, pass/fail results. For
narrowband devices such as crystal filters, the synthesized local oscil-
lator yields stable, repeatable measurements. For devices such as
mixers that perform frequency conversion, swept measurements can
be synchronized with separate sources for complete characterization
in one pass.
Noise Level Measurements
The HP 3585B makes fully calibrated noise level measurements
automatically. Just select the frequency and press the Noise Level
key. The HP 3585B calculates averaged rms noise density and displays the results normalized to a 1 Hz bandwidth. The extremely low
internal noise level makes repeatable, accurate measurements possi-
ble below —137 dBm. For convenience, the marker can provide both
absolute and relative (signal-to-noise) measurements directly.
Before sweep gating After sweep gating.
Specifications
Specifications describe the warranted performance of the HP
3585B over the temperature range 0°C to 55°C, except where noted.
Supplemental characteristics describe typical but non-warranted performance; they are described as "typical" or "approximate" and ap-
ply over the temperature range 25 ±5°C.
Frequency
Measurement range: specifications apply 20 Hz-40.1 MHz
Start/stop, center, manual frequency range: 0 Hz-40.1 MHz
Accuracy: (same as frequency ref. accuracy)
Frequency span: 0 Hz-40.1 MHz
Frequency reference accuracy: ± 1 x 10^-7/mo. of frequency
Marker frequency:
Readout accuracy: ±0.2% of frequency span ± resolution
bandwidth.
Resolution: 0.1 Hz
Resolution bandwidth:
Bandwidth: 3 Hz-30 kHz (3 dB bandwidth) in 1, 3,10 sequence.
Selectivity: 60 dB / 3 dB < 11:1
Video bandwidth: 1 Hz-30 kHz in 1,3,10 sequence
Amplitude
Display scale: 10 vertical division graticule with reference level
(0dB) at top graticule line
Calibration: 1, 2, 5, 10 dB/division
Measurement range:
50/75 input: -137 dBm to +30 dBm or equivalent level in dBV
or volts 1M input: 31 n
Input range settings: autoranging, -25 dBm to +30 dBm in 5dB
steps
Amplitude accuracy
Accuracy note: measurement accuracy is determined by the sum of
reference level accuracy, amplitude linearity (if the signal is not at the
reference level) and frequency response across the measurement span
(if the signal is not at the center or manual frequency). In measure-
ments where the signal is at the reference level and/or at the center or
manual frequency, the amplitude linearity and/or flatness uncertainties will not apply.
Vrms
to 7.08
Vrms
Reference level
Range: -100 dB to +10 dB (relative to input range)
Accuracy: 50/75 0 input (using 1 or 2 dB/div., measured at manu-
al frequency or with sweep rate reduced by a factor of 4):
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