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In summary, the Agilent 54845B is a 1.5 GHz, 4-channel Infiniium oscilloscope from the higher-bandwidth 54840B branch of the Infiniium 54800 Series. It is built around an 8 GSa/s interleaved sample rate architecture (4 GSa/s on each channel) and adds cycle-to-cycle jitter measurement, eye diagram analysis, AutoMask, and an optional Communication Mask Test Kit for ANSI T1.102, ITU-T G.703, and IEEE 802.3 compliance testing. The instrument runs a Windows-based interface on a Pentium III 866 MHz processor with 256 MB CPU memory and a 5 GB internal hard drive, exposes a 10/100 Mbps LAN interface for web-enabled remote control and GPIB-over-LAN, and ships with a 3-year standard warranty.
The Agilent 54845B is used by electronics design engineers, signal integrity engineers, and communications test teams to capture, visualize, and characterize voltage waveforms over time. At 1.5 GHz bandwidth with 8 GSa/s sample rate (interleaved), it is suitable for high-speed digital design, USB 2.0 pre-compliance testing (with Option B30 / E2645A), eye diagram measurement, jitter analysis, and conformance testing against industry communication mask standards including ANSI T1.102, ITU-T G.703, and IEEE 802.3. The four-specification framework — bandwidth, sample rate, channels, and memory depth — determines whether an oscilloscope fits an application, and the 54845B addresses all four with a strong emphasis on bandwidth and sample rate.
Compared to a standard digital storage oscilloscope of its era, the 54845B differentiates on the 8 GSa/s interleaved sample rate, 500 GSa/s equivalent-time sample rate, and the 54840B Series-exclusive measurement suite (cycle-to-cycle jitter, eye diagrams, AutoMask, Communication Mask Test Kit) that elevates the instrument from general-purpose debug into compliance-class measurement work. A Windows-based GUI with drag-and-drop measurements, dialog-box setup, zoom-by-mouse, color-graded persistence with histograms, and a familiar analog-like front panel further distinguishes Infiniium scopes from competing instruments that rely on softkey-menu navigation.
The Agilent 54845B delivers 1.5 GHz analog bandwidth at 50 Ω (–3 dB), a calculated rise time of 233 ps, a maximum sample rate of 8 GSa/s interleaved (4 GSa/s on each channel), and a standard acquisition memory of 64 K (interleaved = CH/2), 32 K on each channel. Equivalent-time sample rate reaches 500 GSa/s for repetitive signals. The instrument provides 8-bit vertical resolution (≥12 bits with averaging), color-graded persistence with histograms, and a waveform update rate of >1,700 waveforms per second. FFT frequency range extends from DC to 4 GHz (2 channels interleaved). Calibration interval and traceable calibration services are available from Agilent under the W32, W34, W50, and W52 service options, with ANSI Z540-compliant calibration available under Option A6J.
Hewlett-Packard spun off its test and measurement and medical divisions as Agilent Technologies in 1999. The Infiniium 54800 Series was introduced under the Agilent brand. In 2014, Agilent divided again, with the electronic measurement business becoming Keysight Technologies — Keysight is now the world's largest dedicated test and measurement company by revenue and holds the support lineage for legacy Agilent Infiniium oscilloscopes. The Infiniium platform has received eight industry awards including EDN's "Innovation of the Year" (twice) and T&M World's "Best in Test."
Per the datasheet, the Infiniium 54800 Series runs a Windows-based interface on a Pentium III 866 MHz processor with 256 MB CPU memory and a 5 GB internal hard drive. This was the standard architecture for high-performance oscilloscopes of this generation. Buyers in defense (CMMC), regulated manufacturing, financial, and healthcare environments should verify with their IT security team whether the embedded OS version on the specific unit is acceptable for network deployment, or whether the instrument should be deployed on an air-gapped lab network with USB-only data transfer. We recommend asking your IT/CISO team in advance to avoid post-purchase deployment delays.
The Infiniium 54800 Series is configured at order time with a combination of acquisition memory, probe, instrument, and service options. The following options apply to the 54845B; not every option is compatible with every model, and notes below indicate the applicable scope where Agilent has specified one.
The 54840B Series (54845B) ships with a fixed 64 kpts interleaved / 32 kpts per channel acquisition memory. Acquisition memory upgrades (Options 040, 080, N2845A, N2846A, N2847A) apply to the 54830B Series only.
The standard 54845B ships with: PS/2 Mouse, Condensed Keyboard, User's Quick Start Guide in English language, Documentation CD (Service Guide, Programmer's Guide, Programmer's Quick Reference Guide), Recovery CD (also available in other languages), Information System in English and Japanese language, Four 1161A 10:1 10 MΩ passive probes, Accessory pouch (54810-68701), US power cord, and a three-year warranty.
The oscilloscope is the heart of the engineer's bench. It is the instrument that translates invisible electricity into a picture an engineer can reason about — voltage plotted against time, with every distortion, glitch, edge, and ripple made visible. Within the Infiniium 54800 Series, Agilent positioned this family as a high-performance, deep-memory platform that brings 600 MHz to 2.25 GHz bandwidth, up to 8 GSa/s sample rate, 2- and 4-channel models, up to 4 Mpts standard / 16 Mpts optional memory, and advanced probing solutions into a single Windows-based instrument design. The platform's tagline at introduction was "Instant Response, Optimum Resolution" — a promise tied directly to the MegaZoom memory management architecture.
The Agilent 54845B is the 1.5 GHz, 4-channel configuration in this family. At 1.5 GHz bandwidth across 4 channels, the 54845B crosses into signal-integrity and high-speed serial territory. Applying the bandwidth rule of 3–5×, this instrument accurately measures signals with fundamental frequencies up to roughly 300–500 MHz, and the calculated rise time of 233 ps (from tr = 0.35/bandwidth) supports edges in the low-hundreds-of-picoseconds range. Adding the 54840B Series feature set — cycle-to-cycle jitter measurement, eye diagram measurements, AutoMask, and the Communication Mask Test Kit option — moves the instrument from general-purpose debug into compliance-class measurement. The 4-channel configuration is the standard for digital hardware debug, multi-rail power analysis, and any measurement that requires viewing four time-correlated signals simultaneously — clock, data, control, and a power rail, for example. Four channels also enables 4-input pattern triggering, which is one of the most useful advanced triggers available on the Infiniium platform.
The 54840B branch of the Infiniium 54800 Series targets the high-bandwidth, signal-integrity, and communications-compliance applications that the 54830B branch's deep memory architecture does not address. At 1.5 GHz bandwidth with 8 GSa/s interleaved sample rate (4 GSa/s on each channel) and a 500 GSa/s equivalent-time sample rate, the 54845B is designed to characterize signals where the measurement priority is bandwidth and time resolution rather than capture duration.
The 54840B Series adds four exclusive measurement capabilities that the 54830B Series does not include: cycle-to-cycle jitter measurement, eye diagram measurements (with Eye Height, Eye Width, Jitter, Crossing %, Q-Factor, and Duty Cycle Distortion), AutoMask for creating a test envelope from a captured waveform, and the Communication Mask Test Kit option (Option 100 / E2625A) which provides more than 20 industry-standard ANSI T1.102, ITU-T G.703, and IEEE 802.3 communication signal mask templates plus a set of electrical communication adapters for accurate connections to the device under test.
Per the datasheet, "Mask testing is simplified with AutoMask. Acquire a waveform, define tolerance limits, and create a test envelope. Mask testing provides a pass/fail comparison of an incoming signal to the test envelope."
Per the datasheet: "A familiar interface makes simple tasks simple. Infiniium's analog-like front panel has a full set of controls color coded to the LEDs, waveforms, and measurements." The Windows-based graphical user interface gives easy access to advanced features like math and FFTs, drag-and-drop measurements, mouse-driven zooming, and a graphical equivalent to all front panel controls.
| Parameter | 54845B Specification |
|---|---|
| Input Channels | 4 |
| Analog Bandwidth @ 50 Ω (–3 dB) | 1.5 GHz |
| Calculated Rise Time @ 50 Ω | 233 ps (calculated from tr = 0.35/bandwidth) |
| Input Impedance | 1 MΩ ± 1% (12 pF typical), 50 Ω ± 1.5% |
| Sensitivity | 2 mV/div to 2 V/div (1 MΩ); 1 mV/div to 1 V/div (50 Ω) |
| Input Coupling | 1 MΩ: AC, DC; 50 Ω: DC |
| Hardware Bandwidth Limit | N/A |
| Vertical Resolution | 8 bits, ≥12 bits with averaging |
| Channel-to-Channel Isolation | DC to 100 MHz: 40 dB; >100 MHz to 1 GHz: 28 dB; >1 GHz to 2.25 GHz: 24 dB |
| DC Gain Accuracy | ± 1% of full scale at full resolution channel scale |
| Maximum Input Voltage (1 MΩ) | ± 100 V (DC + AC) [AC<10 kHz], CAT; ± 250 V (DC + AC) in AC coupling |
| Maximum Input Voltage (50 Ω) | 5 Vrms, CAT |
| Offset Accuracy | ± (1% of channel offset + 1% of full scale) |
| Dynamic Range | ± 8 div from center screen (1 MΩ); ± 8 div from center screen (50 Ω) |
| Parameter | 54845B Specification |
|---|---|
| Main Time Base Range | 100 ps/div to 20 s/div |
| Horizontal Position Range | 0 to ± 1 s or one full screen width, whichever is larger |
| Delayed Sweep Range | 1 ps/div to current main time base setting |
| Resolution | 2 ps |
| Timebase Accuracy | 70 ppm (±0.007%) |
| Channel-to-Channel Deskew Range | ± 100 µs |
| Jitter, RMS | 8 ps ± 0.005 ppm × |delay time| |
| Parameter | 54845B Specification |
|---|---|
| Real Time Sample Rate (Max) — 2 Channels Interleaved | 8 GSa/s |
| Real Time Sample Rate (Max) — Each Channel | 4 GSa/s on each channel |
| Equivalent Time Sample Rate (Max) | 500 GSa/s |
| Memory Depth — Standard | 64 K (interleaved = CH/2), 32 K on each channel |
| Memory Depth — Optional | N/A (no memory upgrades for 54840B Series) |
| Sampling Modes | Real Time, Equivalent Time |
| Sin(x)/x Interpolation Filter | On/Off selectable FIR digital filter; BW = Sample Rate/4 |
| 9-bit Bandwidth (BW) Limit | BW = Sample Rate / 20 (54845B/46B only) |
| Parameter | 54845B Specification |
|---|---|
| Internal Trigger Sensitivity | DC to 100 MHz: 0.5 div; 100 MHz to 500 MHz: 1.0 div; 500 MHz to 1 GHz: 1.5 div |
| Auxiliary Trigger Sensitivity | DC to 500 MHz: 300 mVp-p |
| Internal Level Range | ± 8 div from center screen (1 MΩ); ± 8 div from center screen (50 Ω) |
| Auxiliary Level Range | ± 5 V |
| Sweep Modes | Auto, triggered, single |
| Trigger Coupling | DC, AC, low frequency reject (50 kHz high pass filter), high frequency reject (50 kHz low pass filter) |
| Trigger Conditioning | N/A |
| Trigger Holdoff Range | 60 ns to 320 ms |
| Minimum Glitch Width | 500 ps (glitch range settings: <1.5 ns to <160 ms) |
| Minimum Pulse Width Capture | 500 ps (pulse width range settings: >/<1.5 ns to >/<160 ms) |
| Trigger Modes | Edge, Glitch, Line, Pattern, State, Delay by Time (30 ns to 160 ms), Delay by Events (1 to 16,000,000 edges), TV (525/60 NTSC, PAL-M, 625/50 PAL, 875/60 Zenith HDTV, custom), Pulse Width Violation, Setup/Hold Violation, Transition (edges as fast as 800 ps) |
| Trigger Actions | E-mail on trigger and QuickMeas+ on trigger condition |
| Parameter | 54845B Specification |
|---|---|
| Voltage Measurements | Peak-to-Peak, Minimum, Maximum, Average, RMS, Amplitude, Base, Top, Overshoot, Preshoot, Upper, Middle, Lower, Area |
| Time Measurements | Rise time, Fall time, Period, Frequency, Positive Width, Negative Width, Duty Cycle, Delta Time, Tmin, Tmax, Channel-to-Channel Phase, Cycle-to-Cycle Jitter (54845B/46B only) |
| Frequency Domain FFT | FFT Frequency, FFT Magnitude, FFT Delta Frequency, FFT Delta Magnitude, FFT Phase |
| Eye Pattern Measurements | Eye Height, Eye Width, Jitter, Crossing %, Q-Factor, Duty Cycle Distortion (54845B/46B only) |
| Automatic Measurements | Measure menu access to all measurements; 4 measurements can be displayed simultaneously |
| QuickMeas+ | Front panel button activates four pre-selected or four user-defined automatic measurements |
| Drag and Drop Measurement Toolbar | Measurement toolbar with common measurement icons that can be dragged and dropped onto the displayed waveforms |
| Statistics | Displays mean, standard deviation, minimum and maximum measurement values for the displayed automatic measurements |
| Histograms | Vertical (for timing and jitter) or horizontal (noise and amplitude change) modes; regions defined by waveform markers. Measurements: mean, standard deviation, peak-to-peak value, median, total hits, peak (area of most hits), and mean ± 1, 2, and 3 sigma |
| Eye Diagram Display | Eye diagram display mode allows triggering on both negative-going and positive-going edges of a signal (54845B/46B only) |
| Mask Testing | Pass/fail testing to user-defined or Agilent-supplied waveform templates. AutoMask creates a mask template from a captured waveform with tolerance range in time/voltage or percentage. Test modes: test forever, test to specified time or event limit, stop on failure. Communications Mask Test Kit Option provides ITU-T G.703, ANSI T1.102, and IEEE 802.3 industry standard masks (54845B/46B only) |
| Marker Modes | Manual Markers, Track Waveform Data, Track Measurements |
| Waveform Math | 4 functions f1–f4. Select from Add, Average, Differentiate, Divide, FFT Magnitude, FFT Phase, Integrate, Invert, Magnify, Min, Max, Multiply, Subtract, Versus, Measurement Trend (54845B/46B only) |
| FFT Frequency Range | DC to 4 GHz (2 channels interleaved), DC to 2 GHz (each channel) |
| FFT Frequency Resolution (Best) | Resolution = Sample Rate / Memory Depth; best at maximum sample rate: 125 kHz (at 8 GSa/s / 64 K) |
| FFT Frequency Accuracy | (1/2 frequency resolution) + (5 × 10−5)(signal frequency) |
| Signal-to-Noise Ratio | 70 dB at 32 kpts memory depth |
| FFT Window Modes | Hanning, Flattop, Rectangular |
| Parameter | 54845B Specification |
|---|---|
| Display | 8.4 inch diagonal color TFT-LCD |
| Resolution | 640 pixels horizontally × 480 pixels vertically |
| Annotation | Up to 12 labels, with up to 100 characters each, can be inserted into the waveform area |
| Waveform Styles | Connect Dots, Dots, Persistence (minimum, variable, infinite), Color-Graded Infinite Persistence |
| Waveform Update Rate | >1,700 waveforms/second |
| Vp-p Measurements per Second | >260 |
| CPU | Intel Pentium III™ 866 MHz microprocessor |
| PC System Memory | 256 MB |
| Drives | 5 GB internal hard drive, CD-ROM drive on rear panel, LS-120 Superdisk floppy drive reads/writes to both standard 3.5 inch 1.44 MB and 120 MB disks |
| Peripherals | 2-button PS/2 mouse and condensed keyboard supplied. Supports any Windows 98–compatible input device with a serial, PS/2 or USB interface |
| File Types — Waveforms | Internal Y values; X and Y values in ASCII or Microsoft Excel formats |
| File Types — Images | BMP, PCX, TIFF, GIF or JPEG |
| Parameter | 54845B Specification |
|---|---|
| LAN | RJ-45 connector, supports 10Base-T and 100Base-T. Enables web-enabled remote control, e-mail on trigger, data/file transfers and network printing |
| GPIB | IEEE 488.2, fully programmable |
| RS-232 (serial) | COM1, printer and pointing device support |
| Parallel | Centronics printer port |
| PS/2 | 2 ports — supports PS/2 pointing and input devices |
| USB | 2 ports — allows connection of USB peripherals and pointing devices while the oscilloscope is on |
| Video Output | 15-pin VGA, full color |
| Auxiliary Output | DC (±2.4 V); square wave (715 Hz [±5%]); trigger output (0 to 255 mV p-p [±5%] into 50 Ω) |
| TTL Output | TTL-compatible signal |
| Parameter | 54845B Specification |
|---|---|
| Operating Temperature | + 10°C to + 40°C |
| Non-operating Temperature | −40°C to +70°C |
| Operating Humidity | Up to 95% relative humidity (non-condensing) at +40°C |
| Non-operating Humidity | Up to 90% relative humidity at +65°C |
| Operating Altitude | Up to 4,600 meters (15,000 feet) |
| Non-operating Altitude | Up to 15,300 meters (50,000 feet) |
| Operating Vibration | Random vibration 5–500 Hz, 10 minutes per axis, 0.3 g(rms) |
| Non-operating Vibration | Random vibration 5–500 Hz, 10 minutes per axis, 2.41 g(rms); resonant search 5–500 Hz, swept sine, 1 octave/minute sweep rate, (0.75g), 5-minute resonant dwell at 4 resonances per axis |
| Power | 100–240 VAC, ± 10%, Cat II, 47 to 440 Hz; Max power dissipated: 390 W |
| Weight | Net: 14 kg (31 lbs.); Shipping: 17 kg (37.4 lbs.) |
| Dimensions (excluding handle) | Height: 216 mm (8.5 in); Width: 437 mm (17.19 in); Depth: 440 mm (17.34 in) |
| Safety | Meets IEC1010-1 +A2, CSA certified to C22.2 No.1010.1, Self-certified to UL 3111 |
| Standard Warranty | 3-year, return-to-Agilent |
Specifications are valid after a 30-minute warm-up period, and ±10°C (models 54830B/31B/32B) or ±5°C (models 54845B/46B) from firmware calibration temperature. Specifications marked as Warranted in the original datasheet; all others are typical. The DC gain accuracy decreases 0.08% of full scale per degree C from the firmware calibration temperature. Vertical resolution for 8 bits = 0.4% of full scale; for 12 bits = 0.024% of full scale.
Model No
54845B
Condition
Used
Manufacturer
Agilent
Channels
4
Frequency
1.5 GHz
Record length
32 kPts
Sampling rate
8 GS/s
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