UDS-2128 New UDS−2113 Series
PC−Communication Analyzers

Specifications and Characteristics

Channel Configuration

Number of Channels

O/E Converter +Two Electrical Channels or One Optical Channel +One Electrical Channel

Optical Channel

Unfiltered Optical Bandwidth

UDS-2128: 8 GHz; UDS-2123: 3 GHz


Single-mode (SM) or Multi-mode (MM)

Wavelength range

750 nm to 1650 nm

Calibrated wavelengths

850nm (MM), 1310nm (MM/SM), 1550nm (SM)

Optical sensitivity (smallest average optical power required for mask test)

13 dBm

Transition time (10% to 90% calculated from Tr = 0.48/BW optical)

UDS-2128: 60 ps; UDS-2113: 160 ps

RMS noise (maximum)

4.5 µW (1310 nm), 6 µW (850 nm)

Scale factor

1 µW/div to 400 µW/div

Maximum input peak power

+7dBm (1310nm)

Fiber input connector


Input Return Loss

SM: -24dB (typ), MM: -16dB (typ),-14dB (max)

Filter Data Rates

Standard: 155.52Mbps (OC-3/STM-1), 1.25Gbps (GBE) and 2.488Gbps (OC-48/STM-16). Optional: 622.08Mbps (OC-12/STM-4), 1063Mbps (Fc1603), 2.125Gbps (Fc2125), 2.500Gbps (Infiniband2.5G), 3.125Gbps (XAUI)

Electrical Channel

Number of Channels

2 (Simultaneous acquisition)

Characteristics UDS-2128 UDS-2128
Typical Applications General Purpose Signal and Device Characterization Low-level Signals
Bandwidth 20 or 12 GHz 12 GHz
Rise Time (10% to 90%, calculated from Tr=0.35/BW) < 17.2 ps or< 29.2 ps < 29.2 ps
RMS Noise (maximum) 2 mV @ 20 GHz,1.5 mV @ 12 GHz 1 mV @ 12 GHz
TDR/TDT Channels 40-ps Single-ended
with UDX-G01 Pulse Head
45-ps Single-ended
TDR/TDT with UDX-G01
Pulse Head

Scale Factors (Sensitivity)

1 mV/div to 255 mV/div (Full scale is 8 divisions). Adjustable from 1 mV/div to 255 mV/div in a 1-2-5-10 sequence. Also adjustable in fine increments 0.5 mV to 2 mV

DC Difference Voltage Accuracy

± 1.6 % of full vertical scale ± 2 mV

DC Offset Range

Adjustable from -1 V to 1 V in a 25 mV increments (coarse). Also adjustable in fine increment 1 mV.



Vertical Resolution

125 uV/LSB without averaging. Up to 16 bit with averaging.

Maximum operating input voltage

1.0 V p-p at ± 1 V range.

Maximum Safe Input Voltage

16 dBm, or ± 2 V (dc + peak ac).

Nominal Input Impedance

(50 ± 1) OHm.

Input Connectors

SMA (f).

Deskew (The difference in delay between channels)

Can be nulled out with 1-ps resolution to compensate for differences in input cables or probe length. Up to 100 ns of skew can be nulled out.


Attenuation factors may be entered to scale the oscilloscope for external attenuators connected to the channel inputs. Range: 0.00001:1 to 1,000,000:1. Units: Ratio or dB. Scale: Volt, Watt, Ampere, or Unknown.

Channel-to-channel isolation

> 40 dB.

Time Base (Horizontal)

Time Bases

Main, Intensified, two Delayed, Dual Delayed.

Scale Factors

Main Time Base: 10 ps/div to 2 ms/div (Full scale is 10 divisions). Delayed Time Bases: 10 ps/div to current Main Time Base setting. Adjustable in a 1-2-5-10 sequence. Also adjustable in fine increment 1 ps, or 0.1% and better.

Delta Time Interval Accuracy

± 0.4% of reading ± 15 ps ± 100 ppm of delay setting (maximum); ± 0.4% of reading ± 10 ps ± 100 ppm of delay setting (typical).

Note: Measured at a temperature within ± 3°C of horizontal calibration temperature.

Typical Timing Accuracy

The time base uses a series of 2-ns blocks. Time base linearity and small discontinuities across these blocks contribute to the 10-ps accuracy specification.

Variable Delay (Time offset relative to trigger)

Up to 1000 screen diameters of Delayed Time Base or 19.98 ms, whichever is smaller.

Minimum Delay (Minimum time offset relative to trigger)

‹ 40 ns.

Display Units

Time or Bit Period.

Time Interval Resolution

Screen diameter / (record length) or 100 fs, whichever is larger.


Trigger Sources

External (Direct Trigger), External HF with different trigger heads, Internal Clock trigger (internally connected to direct trigger).

Trigger Holdoff

Adjustable from 10 us to 30.72 ms in a 1-2-5-10 sequence, or in 2 ns increments.

Internal Clock Repetition Rate

10 us to 2 ms in a 1-2-5-10 sequence, or in 125 ns increments.

Direct Trigger

Trigger Modes

Triggered: causes the scope to trigger synchronously to the trigger input signal. Freerun: causes the scope to generate its own triggers.


Positive: triggers on positive-slewing edge. Negative: triggers on negative-slewing edge.

Trigger Bandwidth and Sensitivity

100 mV p-p DC to 100 MHz. Increasing linearly from 100 mV p-p at 100 MHz to 400 mV p-p at 1 GHz. Pulse Width: 500 ps @ 400 mV p-p

RMS Jitter

2.5 ps + 50 ppm of delay setting (maximum); 2.0 ps + 30 ppm of delay setting (typical).

Note: Measured at 1 GHz with the triggering level adjusted for optimum trigger.

Trigger Level Range

-1 V to 1 V.

Trigger Level Resolution

1 mV.

Trigger Hysteresis

Normal: the trigger hysteresis is set so the instrument meets the trigger sensitivity specification. High Sensitivity: hysteresis is turned off to allow a best sensitivity to high-frequency signals. This mode should not be used for noisy lower frequency signals that may miss-trigger without hysteresis.

Maximum Safe Trigger Input Voltage

± 2 V (dc+peak ac) or 16 dBm.

Nominal Input Impedance

(50 ± 1) OHm.

Trigger Coupling

DC coupled.

Trigger Input Connector

SMA (f)

External HF Trigger

Several trigger heads enhance trigger possibilities of the UDS-2000 sampling oscilloscopes. See Compatible with the Oscilloscopes for details


SMA (f)


Prescaled trigger up to 12 GHz


Prescaled trigger up to 18 GHz


Low-Jitter Trigger less than 300 fs up to 12 GHz


Clock recovery trigger for fixed 622 Mbps data rate


Clock recovery trigger for fixed 2.488 Gbps data rate


Clock recovery trigger 10 Mbps to 2.7 Gbps continuous data rate

Internal Clock Recovery trigger from O/E Converter (optional)

Clock Recovery Range

50 Mbps to 2.7 Gbps continuous rate.

Maximum RMS Jitter

1.25% of Unit Interval


O/E Converter to Clock Recovery: AC. Clock Recovery to Trigger: AC. Clock Recovery to Clock Out: AC. Clock Recovery to Data Out: AC

Recovered Trigger Clock Output Frequency

Clock Recovery to Trigger: Input Bit Rate. Clock Recovery to Clock Out: Input Bit Rate/4

Recovered Trigger Clock Amplitude

400 mV p-p.

Recovered Data Amplitude

400 mV p-p

Output Connectors

SMA (f)


Number of Acquisition Channels

2 (Simultaneous acquisition).

ADC Resolution

14 -Bits.

Digitizing Rate

DC to 100 kHz. The signal is sampled and digitized at a rate dictated by the trigger repetition rate and the time base range. If data acquisition is not trigger rate limited, the maximum sample rate is 100 kHz.

Acquisition Modes

Sample (normal), Average, Envelope, or Peak Detect.

Average Modes

Stable, Multiple, or Median.

Number of averages

From 2 to 4096 in x2 sequence.

Envelope Modes

Min, Max or both Min-Max values acquired over one or more acquisitions.

Peak Detect Mode

High frequency and short repetitive glitch capture. Captures glitches of 20 ps using acquisition hardware at al horizontal scales.

Data Record Length

32 to 4096 points maximum per channel in x2 sequence.


Display Resolution

Full: 640 points horizontally x 480 points vertically, Data: 501 points horizontally x 257 points vertically.

Display Style

Dots; Vectors; Variable Persistence: time that each data point is retained on the display, persistence time can be varied from 100 ms to 20 s; Infinite Persistence; Variable Gray Scaling: five color levels that are used are one color that is varied in saturation and luminosity levels (in other words, different shades of the same color), refresh time an be varied from 1 s to 100 s; Infinite Gray Scaling; Variable Color Grading: with Color Grading selected, historical timing information is represented by temperature or spectral color scheme providing "z-axis" information about rapidly changing waveforms. Refresh time can be varied from 1 to 200 s, Infinite Color Grading.


Full Grid, Axes with tic marks, Frame with tic marks, Off (no graticule).


Single: all waveforms are superimposed and are eight divisions high. Dual: with two graticules all waveforms can be displayed separately or are superimposed with four divisions high. Quad: with four graticules all waveforms can be displayed separately or are superimposed with two divisions high. When you selected dual or quad screen display every waveform channels, memories, and functions can be placed on specified graticule.

Display Format

YT, XY or both YT & XY.


You may choose a Default Color selection, or select your own Set Color. Different colors are used for display selected Item: background, channels, functions, waveform memories, FFTs, TDR/TDTs, and histograms.



Store and recall setups, waveforms, data base and screen images to both the hard drive and the floppy drive of the PC. Storage capacity is limited only by disk space.

File extensions for waveform files

The following file extensions for waveform and setup files are used: Waveforms - .wfm for binary format, .txt for text format, .wfm, and .txt for both formats. Data base files - .cgs. Setup files - .set.

Operating System

Microsoft Windows® 95/98/ME/NT4/2000/XP.

Waveform Save/Recall

Up to four waveforms may be stored into Waveform Memories (M1-M4), and then recalled on display.

Save/Recall to Disk

You can save or recall your acquired waveforms or data base to or from hard disk or floppy disk of PC. To save a waveform, use the traditional Windows "Save as"dialog box. From this dialog box you can create subdirectories, new waveform files, or overwrite existing waveform files. You can load file with a waveform or data base you have previously saved, into one of Waveform Memories, and then recall it on display.

Save/Recall Setups

The instrument may store into the memory and then recall complete setups.


Pressing the Autoscale key automatically adjusts the vertical of channels, the horizontal scale factors, and the trigger level for a display appropriate to the signals applied to the inputs. The Autoscale feature requires a repetitive signal with a frequency greater than 1 kHz, duty cycle greater than 1%, amplitudes greater than 50 mV p-p (vertical) and 200 mV p-p (trigger). Autoscale is operative only for relatively stable input signals.


Marker Type

X-Marker: vertical bars (measure time). Y-Marker: horizontal bars (measure volts). XY-Markers: waveform markers (x and +).

Marker Measurements

Absolute, Delta, Volts, Time, Frequency, Slope (Volts/Time).

Marker Modes

Independent: both markers can be adjusted independently. Paired: both markers can be adjusted together.

Ratiometric measurements

Provide ratiometric measurements between measured and reference values. These measurements give results in such ratiometric units as %, dB, and Degrees.


Automated Measurements

Up to ten simultaneous measurements, or four statistics measurements can be are supported at the same time.

Automatic Parametric

39 automatic measurements available.

Amplitude Measurements

Maximum, Minimum, Peak-Peak, Top, Base, Amplitude, Middle, Mean, dc RMS, ac RMS, Area, Cycle Middle, Cycle Mean, Cycle dc RMS, Cycle ac RMS, Cycle Area, Pos. Overshoot, Neg. Overshoot.

Timing Measurements

Period, Frequency, Pos Width, Neg Width, Rise Time, Fall Time, Pos Duty Cycle, Neg Duty Cycle, Pos Crossing, Neg Crossing, Burst Width, Cycles, Time@Maximum, Time@Minimum.

Dual-Channel Measurements

Delay, Gain.

FFT Measurements

FFT Magnitude, FFT Delta Magnitude, THD, FFT Frequency, FFT Delta Frequency.

Measurement Statistics

Display minimum, maximum, mean and standard deviation on any displayed waveform measurements.


A miniature histograms of parameter measurements that appear in Measurement Area. These thumbnail histograms let you see at a glance the statistical distribution of each parameter.

Method of Top-Base Definition

Histogram, Min/Max, or User Defined (in absolute voltage).


Settable in percentage, voltage or divisions. Standard thresholds are 10-50-90 % or 20-50-80 %.

MarginsAny region of the waveform may be isolated for measurement using vertical bars.

Any region of the waveform may be isolated for measurement using vertical bars.

Measurement Mode

Repetitive or Single-shot.

Limit Test

Limit Test

Signals can be tested by up to ten automatic parametric measurements and compared to user-defined test boundaries. Failure tolerances can be selected independently for each of the parametric tests. Limit test can be set to run continuously for a user-selected number of waveforms, or for a defined number of failures.

On failure actions

Beep, Save failed waveform to disk or Stop acquisition.


Waveform Math

Up to four math waveforms can be defined and displayed using math functions F1-F4.

Math Operators

Add, Subtract, Multiply, Divide, Invert, Absolute, Exponentiation (e), Exponentiation (10), Logarithm (e), Logarithm (10), Differentiate, Integrate, Inverse FFT, Linear Interpolation, Sin(x)/x Interpolation, Smoothing, Trend.


Any channel, waveform memory, math function, spectrum, or constant can be selected as a source for one of two operands.



Up to two fast Fourier transforms can be run simultaneously.

Frequency Span

Frequency Span = Sample Rate / 2 =Record Length / (2 x Time Base Range).

Frequency Resolution

Frequency Resolution = Sample Rate / Record Length.

FFT Windows

The built-in filters (Rectangular, Nicolson, Hanning, Flattop, Blackman- Harris and Kaiser-Bessel) allow optimization of frequency resolution, transients, and amplitude accuracy.

FFT Measurements

Marker measurements can be made on frequency, delta frequency, magnitude, and delta magnitude. Automated FFT Measurements include: FFT Magnitude, FFT Delta Magnitude, THD, FFT Frequency, and FFT Delta Frequency.


Zoom feature

The zoom feature allows waveforms (memories, functions, and spectrums) to be expanded and positioned in both vertical and horizontal axes. Allows precise comparison and study of fine waveform detail without affecting ongoing acquisitions.

Complex Scale

You can select different Complex Scale: Magnitude, Phase, Magnitude + Phase, Real, Imaginary, and Real + Imaginary.

Vertical expanding and positioning

Zoom provides a vertical dynamic range of 10 mln. divisions or 1 mln. screens.

Horizontal expanding and positioning

Zoom provides a horizontal dynamic range of 640 divisions or 64 screens.


Histogram Axis

Vertical, or Horizontal. Both vertical and horizontal histograms, with periodically updated measurements, allow statistical distributions to be analyzed over any region of the signal.

Histogram Measurement Set

Scale, Offset, Hits in Box, Peak Hits, Pk-Pk, Median, Mean, Standard Deviation, Mean ± 1 Std Dev, Mean ± 2 Std Dev, Mean ± 3 Std Dev.

Histogram Window

The histogram window determines which part of the database is used to plot the histogram. You can set the size of the histogram window to be any size that you want within the horizontal and vertical scaling limits of the scope.


Eye Diagram

The UDS-2000s has ability to automatically characterize NRZ and RZ eye pattern. Measurements are based upon statistical analysis of the waveform.

NRZ Measurement Set

AC RMS, Area, Bit Rate, Bit Time, Crossing %, Crossing Level, Crossing Time, Cycle Area, Duty Cycle Distortion (%, s), Extinction Ratio (dB, %, ratio), Eye Amplitude, Eye High, Eye Width (%, s), Fall Time, Frequency, Jitter (P-p, RMS), Max, Mean, Mid, Min, Neg Overshoot, Noise P-p (One, Zero), Noise RMS, One Level, Peak-Peak, Pos. Overshoot, Period, Rise Time, RMS, Signal-to-Noise, Zero Level.

RZ Measurement Set

AC RMS, Area, Bit Rate, Bit Time, Contrast Ratio (dB, %, ratio), Cycle Area, Eye Amplitude, Eye High, Eye Opening Factor, Eye Width (%, s), Fall Time, Jitter (P-p, RMS), Max, Mean, Mid, Min, RMS, Rise, Fall, Neg Crossing, Noise P-p (One, Zero), Noise RMS, One Level, Peak-Peak, Pos. Crossing, Pos. Duty Cycle, Pulse Width, Rise Time, RMS, Signal-to-Noise, Zero Level.

Mask Test

Mask Test

Acquired signals are tested for fit outside areas defined by up to eight polygons. Any samples that fall within the polygon boundaries result in test failures. Masks can be loaded from disk, or created automatically or manually.

Mask Creation

You can create the following Mask: Standard predefined Mask, Automask, Mask saved on disk, Create new mask, Edit any mask.

Standard Mask

Standard predefined optical or standard electrical masks can be created.SONET/SDH: OC1/STMO, OC3/STM1, OC9/STM3, OC12/STM4, OC18/STM6, OC48/STM16, FEC2666, OC192/STM64, FEC1066, FEC1071, FEC4266, FEC4302; Fiber Channel: FC133, FC266, FC531, FC1063, FC2125, FC4250, 10GFC; Ethernet: GB Ethernet, 2XGB Ethernet, 10GB Ethernet, 10GBE Ethernet, 10XGB Ethernet; INFIBAND, XAUI; ITU G.703: DS1, DS2, 8 Mb, DS3, 140 Mb; ANSI T1/102: DS1, DS1C, DS2, DS3, STS1 Eye, STS1 Pulse, STS3.

Mask Margin

Available for industry standard mask testing.

Automask Creation

Masks are created automatically for single-valued voltage signals. Automask specifies both delta X and delta Y tolerances. The failure actions are identical to those of limit testing.

Data collected during test

Total number of waveforms examined, number of failed samples, number of hits within each polygon boundary.

UDX-G01 Pulse Head

The UDX-G01 Pulse Head is a fast tunnel-diode step generator designed for use with the UDS-2000 Series PC-Sampling Oscilloscopes for short-distance 40-ps TDR/TDT. See UDX-G01 for details.


Vertical Calibrator

Modes: DC, Pseudo-meander, or Off. Adjustable Output Range: -1.0 V to +1.0 V terminated into 50 OHm. Output Voltage Accuracy: ± 0.25 % of Output Voltage ± 1 mV.

Horizontal Calibrator

Waveform: Square-Wave. Polarity: Positive from ground. Adjustable Period: 80 ns to 2 ms. Period Accuracy: ± 0.01 % of Period. Output Voltage: >700 mV terminated into 50 OHm.

DSO to PC Interface


USB 2.0 (FS) or IEEE1284 (ECP mode)

Environmental Characteristics


Operating: + 5°C to + 40°C. Non-operating: -40°C to + 50°C.


Operating: up to 85 % relative humidity (non-condensing) at + 25°C.

Power Requirements


95 to 125 VAC or 190 to 250 VAC.


70 VA maximum.


70 VA maximum.

Physical Characteristics


Width (with handle): 270 mm, Width (without handle): 240 mm, Height: 102 mm, Depth (with handle): 420 mm, Depth (without handle): 377 mm.


Net: 6.5 kg, Shipping: 12.0 kg.

UDS-2128, New UDS-2113
PC-Communication Analyzers

Key specifications

• 20 GHz or 12 GHz Electrical Bandwidth

• 8 GHz or 3 GHz Unfiltered Optical Bandwidth

• Two electrical /One optical channel

• Three Bessel-Thomson filters

• 750 nm to 1650 nm Wavelength range

• DC to 1 GHz Full-function Trigger

• 12-GHz Optional Prescaled Trigger

• Optional Clock Recovery Trigger