1Overview
The Model 765 is the fast-edge member of the Berkeley Nucleonics pulse and delay generator family. It produces pulses with a standard rise and fall time below 70 ps (20% to 80%), repetition rates to 800 MHz per channel, and period jitter of 4 ps RMS. Pulse amplitude is programmable from 10 mVpp to 5 Vpp with an adjustable baseline offset of plus or minus 2.5 V.
Each channel carries its own delay, width, amplitude, and offset, set with 10 ps resolution. A redesigned analog front end holds overshoot below 5% and keeps ringing minimal, so the pulse you program is close to the pulse you measure. Setup runs through a 7-inch touchscreen GUI backed by push-buttons and a rotary encoder. Advanced pulse modes cover single, double, triple, and quadruple output as well as external-width operation.
2Key Features
- Rise and fall time below 70 ps (20% to 80%)
- Pulse width from 300 ps to more than 7 seconds
- 800 MHz repetition rate per channel with 4 ps RMS jitter
- Two or four fully independent channels
- 10 ps resolution on both width and delay
- Adjustable pulse amplitude from 10 mVpp to 5 Vpp
- Plus or minus 2.5 V adjustable baseline offset
- 7-inch touchscreen with push-buttons and rotary encoder
3Channels & Timing Architecture
The Model 765 ships in a two-channel or four-channel configuration. Every channel is independent: delay, width, amplitude, and baseline offset are set per channel, and the channel-to-channel jitter stays below 10 ps. That independence lets one instrument drive several points in a timing chain without a separate box for each edge.
Timing is referenced to an internal time base accurate to plus or minus 2 ppm, with an external reference clock input from 10 MHz to 100 MHz for locking to a system clock. Delay covers 0 ps to 8 seconds, and pulse period spans 5 ns to 8 seconds, both at 10 ps resolution. Multiple-pulse modes (single, double, triple, quadruple, and external width) let a single channel emit pulse groups for sequencing and burst work.
4Specifications
Timing and Period
| Parameter | Model 765 |
|---|---|
| Channels | 2 or 4 independent |
| Pulse period range | 5 ns to 8 s |
| Pulse period resolution | 10 ps |
| Pulse period jitter | 4 ps |
| Max pulse frequency | 800 MHz (Quad mode) |
| Time-base accuracy | ±2 ppm |
| Pulse modes | Single, double, triple, quadruple, external width |
Width and Delay
| Parameter | Model 765 |
|---|---|
| Pulse width range | 300 ps to 8 s |
| Pulse width resolution | 10 ps |
| Pulse width accuracy | ±0.1% + 30 ps |
| Pulse width jitter | < 10 ps |
| Pulse delay range | 0 ps to 8 s |
| Pulse delay resolution | 10 ps |
| Pulse delay accuracy | ±0.1% + 100 ps |
| Channel-to-channel jitter | < 10 ps |
Amplitude and Edges
| Parameter | Model 765 |
|---|---|
| Pulse amplitude range | 10 mVpp to 5 Vpp |
| Amplitude resolution (250 mVpp to 5 Vpp) | 4 mV |
| Amplitude resolution (10 mVpp to 250 mVpp) | 1 mV |
| Baseline offset range | ±2.5 V |
| Baseline offset resolution | 2 mV |
| Rise time (20% to 80%) | < 70 ps |
| Rise time (10% to 90%) | < 95 ps (1 Vpp); < 105 ps (5 Vpp) |
| Fall time (20% to 80%) | < 70 ps |
| Fall time (10% to 90%) | < 95 ps (1 Vpp); < 105 ps (5 Vpp) |
| Overshoot | < 5% |
| Output impedance | 50 Ω |
Power, Physical, and Compliance
| Parameter | Model 765 |
|---|---|
| Power input | 100 to 240 VAC ±10%, 47 to 63 Hz |
| Power consumption | 120 W |
| Operating temperature | 5 °C to 40 °C |
| Display | 7-inch touch LCD |
| Connectivity | HDMI, VGA, USB, RS-232, LAN |
| Dimensions (W x H x D) | 17.5 x 5.3 x 12.6 in [445 x 135 x 320 mm], 3U 19-inch rackmount |
| Weight | 21.7 lbs [9.7 kg] |
| Safety / EMC | EN61010-1, EN61326-1:2013 |
5Triggering & I/O
Trigger modes cover single, continuous, burst, and gated operation. The trigger input impedance is selectable between 50 Ω and 1 kΩ, accepting plus or minus 3.5 V into 50 Ω or plus or minus 10 V into 1 kΩ, with a minimum detectable amplitude below 50 mVpp. The trigger threshold is adjustable across plus or minus 8 V at 10 mV resolution.
| Parameter | Model 765 |
|---|---|
| Trigger modes | Single, continuous, burst, gated |
| Trigger input impedance | 50 Ω or 1 kΩ selectable |
| Trigger input range | ±3.5 V (50 Ω); ±10 V (1 kΩ); < 50 mVpp min |
| Trigger threshold | ±8 V, 10 mV resolution, ±100 mV accuracy |
| Maximum trigger frequency | 40 MHz |
| Minimum trigger pulse width | 1 ns |
| Trigger jitter | < 30 ps (Trig IN to OUT, ≤ 15 MHz) |
| Reference clock input | 10 MHz to 100 MHz, 50 Ω, −5 to 4 dBm |
| Reference clock output | 10 MHz or input frequency, 50 Ω, square 0 to 1.25 V (50 Ω) or 0 to 2.5 V (Hi-Z) |
6Options & Configurations
- Two-channel or four-channel configuration
- Related high-voltage variant: Model 765-HV, one or two channels, up to plus or minus 50 Vpp, 400 MHz
For applications that need amplitude above 5 Vpp, the Model 765-HV shares the same family architecture while driving up to plus or minus 50 Vpp into 50 Ω.
7Applications
- Radar and sonar systems
- Semiconductors and lasers
- High-precision timing
- Big physics, including photomultipliers and colliders
- High-speed detectors and comparators
- Strip silicon emulation
- Mass spectroscopy
8Ordering / In the Box
Specify channel count (two or four) when ordering. The instrument ships as a 3U 19-inch rackmount unit with power cord and a calibration certificate. Shipping dimensions are 24 x 19 x 13 in at 28 lbs.
| Item | Detail |
|---|---|
| Model 765, 2-channel | 800 MHz, < 70 ps rise time, two independent channels |
| Model 765, 4-channel | 800 MHz, < 70 ps rise time, four independent channels |
To configure or quote, contact Berkeley Nucleonics at info@berkeleynucleonics.com or 800-234-7858.