BNC Model 575, Digital Delay and Pulse Generators
DESCRIPTION
The Model 575 provides multi-channel 250 ps-resolution timing, delaying, gating, pulsing, and synchronizing functions for an attractive price. There are many practical modes of operation and features in addition to the traditional digital delay and pulse generator modes. For usefulness and value – there is nothing comparable.
Each channel provides both delays and widths - a 2-channel Model 575 provides the same delay and width functionality of competitive 4-channel units. The 575 is available in 2, 4, and 8 channel configurations, with optional Ethernet, High Voltage, and Dual Input Trigger options. This Digital Delay/Pulse Generator, representing our finest in precision timing, provides precise delays and widths with 250 ps resolution for times up to 1000 seconds. Low jitter both with internal clocks (50 ps) and using an external trigger (800 ps) give users the timing needed to control many devices.
This is particularly useful where several pulses or gate signals need to be delayed and timed with respect to each other or the common trigger. You may even use one channel as a trigger reference for other channels, locking the timing delays when needed. There is much to learn about the Model 575, which offers much more with a clock-divider, independent channel triggering, independent amplitudes/channel, delay and width control, and a LabVIEW 8 driver. Give us a call, we are happy to discuss your applications.
FEATURES
Field Programmability
Customer Output Modes
Custom Modules such as the TZ-50 give users an expand list of capabilities with the Model 575. One example is our TZ-50 option, which allows customers a TTL signal into 50 ohms expanded.
Negative Delay
Use the handy negative delay feature to reference one channel with respect to another channel in positive or negative time increments. By allowing a channel to reference another channel as its trigger, you can synchronize the channels with respect to each other.
Note that Negative Delay cannot trigger a channel before your initial trigger. It is intended to complement the channel referencing option.
NEW AT45 High Voltage Options
45V Rise, 50 Ohm, 10nS / Div
45V Rise Hi Z, 10nS / Div
***Due to the power consumption and heat restrictions, a maximum of four AT45 channels can be added on a single unit***
SPECIFICATIONS
DELAYS
| Range | 0-1000 s |
| Resolution | 250 ps |
| Timebase | 25 ppm |
| RMS Jitter | 200 ps |
| Pulse Inhibit Delay | 120 ns |
| Output Inhibit Delay | 50ns |
SYSTEM EXTERNAL TRIGGER INPUT
| Number | 2|1 |
| Rate | DC to 1/(200ns + longest delay) maximum of 5MHz |
| Threshold | 0.2 to 15 VDC |
| Max Input Voltage | 60 V Peak |
| Resolution | 10 mV |
| Slope | Rising or Falling |
| Impedance | 1 M ohm + 40 pF or 50 ohm |
| Jitter | 800 ps RMS |
| Insertion Delay | 120 ns |
GATE INPUT(S)
| Number | 0|1 |
| Threshold | 0.2 to 15 VDC |
| Max Input Voltage | 60 V Peak |
| Resolution | 10 mV |
| Polarity | Active High/Active Low |
| Function | Pulse Inhibit or Output Inhibit |
| Channel Behavior | Global w/ Individual Channel Enables |
INTERNAL RATE GENERATOR
| Rep Rate | 0.001 Hz to 10.000 MHz (1000 s - 100 ns) |
| Resolution | 5 uS |
| Accuracy | Same as timebase |
| Jitter | 50 ps |
| Setting | 1 cycle |
| Burst Mode | 1 to 10,000,000 |
TTL/ ADJUSTABLE OUTPUTS
| Number of Channels | 2, 4 or 8 Outputs |
| Impedance | High Impedance |
| Pulse Width Range | 10 ns - 1000 s |
| TTL Rise Time (10% - 90%) | 3 ns typical |
| Adjustable Slew Rate | 0.1 V/ns |
| Overshoot | < 100 mV + 10% of pulse amplitude |
| Levels | TTL 4 VDC into Hi-Z Adjustable amplitude, 2.0 to 20.0 VDC into Hi-Z; 10 mV resolution |
ELECTRICAL OUTPUTS
| Number | 0, 2, 4 or 8 |
| Rate | DC to 1(0.2 us + longest delay) |
| Threshold | 0.2 to 15 VDC |
| Max Input Voltage | 60 V Peak |
| Resolution | 10 mV |
| Impedance | 1 M ohm + 40 pF or 50 ohm |
| Function(s) | Individual Channel Trigger Gate/ Follower |
| Trigger Slope | Rising or Falling |
| Gate Polarity | Active High or Active Low |
| Trigger Jitter | < 2 ns |
OPTICAL OUTPUTS
| Number | 0, 2, 4, or 8 |
| Wavelength | 820 nm or 1300 nm |
| Max Signal Rate | 5 M Bd |
| Max Link Distance | 1.5 km |
| Connector Type | ST |
| Resolution | 500 ps |
| Accuracy | 1 ns + .0001 x delay |
OPTICAL INPUTS
| Number | 0 or 2 |
| Wavelength | 820 nm or 1300 nm |
| Max Signal Rate | 5 Mbd |
| Max Link Distance | 1.5 km |
| Connector Type | ST |
| Resolution | 500 ps |
| Accuracy | 2 ns + .001 x delay |
| Optical Trigger | 2412 |
| Trigger Delay | < 300 ns |
| Jitter | < 15 ns |
STANDARD FEATURES/ FUNCTIONS
| Communications | USB / RS232 |
| Global Gates/Triggers | 2 Global Gate/Trigger Inputs |
| Channel Gates/Triggers | Optical/Electrical available (5 ns Jitter) |
| External Clock in | 10 MHz - 100 MHz (User Selectable in discrete values) |
| External Clock out | 10 MHz - 100 MHz (User Selectable in discrete values) |
| Command Set Compatibility | Backwards Compatible |
Options
Summary of Electrical Outputs
- AT20 – The standard 575 provides a selectable TTL or 20V into a high impedance from a 50 Ω source impedance. The TTL level is fixed; the 20V level is adjustable down to 2V. The risetime is 3 ns.
- TZ50 – Choose this option on 2, 4, or all 8 channels to get TTL levels into 50 Ω. The standard output provides 4V pulses from 50 ohms which becomes 2V into a 50 Ω load. The TZ50 provides 4V into 50 Ω. The risetime is 3 ns.
- AT45 – Choose this option to get 45V into 50 Ω. This option provides an adjustable 3-45V pulse into 50 Ω. The risetime is a respectable 2 ns. This is our newest option and will replace the AT35 in many applications unless price sensitivity makes the AT35 more attractive **Due to the power consumption and heat restrictions, only a maximum of four AT45 channels can be added on a single unit.
- AT35 – This is our standard high voltage module. Order 2, 4, or all 8 channels. This gives you 35V into 50 Ω. This option provides an adjustable 35V pulse into 50 Ω. The risetime is 30 ns.
- TZ35 – This is a combination of AT35 and TZ50 module. Order 2, 4, or all 8 channels. This gives you 35V into 50 Ω and TTL (4V) into 50 Ω. This option provides an adjustable 35V pulse into 50 Ω. The risetime is 30 ns.
Summary of Optical Outputs
- L82 – 820nm Optical Output
- L130 – 1300nm Optical Output
Feature Summary Optical Inputs and Outputs
Berkeley Nucleonics provides the option of having combinations of optical and electrical inputs and outputs. For example, one may have an eight-channel unit with an electrical input and four optical and four electrical outputs. One may also order all optical inputs and outputs.
Some advantages of optical fiber
- EMI Immunity
- Level translation – Move triggers from one potential to another
- No sparks and no high voltage pulses to overcome noisy environments
- Smaller size and much less weight than copper cables
- Span longer distances without signal degradation
- Can easily fit in existing installations
Wavelengths, connectors, and fiber considerations
- Commercially available transmitters and receivers to facilitate your interface
- One may select either 820 or 1300nm
- ST is the standard connector with 0.2dB typical
- Compatible with 50/125 um, 62.5/125 um, 100/140 um and 200 um HCS fibers.
- Distances up to 1.5 km using these receivers and transmitters