Signal Recovery- Gated Integrator (Model:4121 B)

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Overview

This module is an ideal component for building boxcar averager systems. It includes a wide bandwidth variable gain AC/DC coupled input amplifier with offset adjustment and a high speed sampling gate with variable width and delay controls. It operates in normal or baseline sampling mode and features a switch-selected choice of how many samples are included in the averaging process. Separate outputs for the average and last sample taken are also provided. A gate monitor supplies a synchronized gate output pulse for application to an oscilloscope trigger or for referencing associated processing electronics. Trigger input is ECl or TTL or can be derived from the module's own adjustable trigger generator.

The module is packaged in a 2-unit wide NIM format and as such requires a suitable NIM rack and power supply to operate. The simplest single-channel system can therefore be produced with one model 4121 B module and a suitable NIM rack and power supply (such as the SIGIVAL RECOVERY model 4006 or 4001A14002D. The addition of a second model4121B and a model 4161A Display/ADC and control module provides a dual channel system with the added capability of allowing the transfer of output data to a computer for external analysis. Further modules can be added to increase the overall number of channels.

The unit can also be used with other SIGIVAL RECOVERY instruments, such as our lock-in amplifiers, to build systems capable of swept-gate waveform recovery experiments, all controlled via the Acquire data acquisition software.

  • 1 ns minimum gate width
  • 80 kHz max trigger rate 
  • Linear or Exponential averaging 
  • Input offset control 
  • Normal or Baselilne sampling modes
  • Built-in trigger generator 
  • Pulsed laser experiments
  • Phosphorescence decay time studies
  • Precison signal sampling

Specifications

<>General
Single-channel gated integrator module mounted in NIM enclosure with adjustable sensitivity, offset, gatewidth and output averager.  Manual controls.

Analog gate delay generator with manual or DC voltage control.

Measurement Modes
On receipt of an external trigger, the instrument waits for the preset gate delay and then integrates the voltage present at its input for the preset gate width.  On completion a DC voltage representing this integral is provided at the Last Sample Output connector and in addition fed forward into an analog integrator state. 
Single-channel gated integrator module mounted in NIM enclosure with adjustable sensitivity, offset, gatewidth and output averager.  Manual controls.Analog gate delay generator with manual or DC voltage control.On receipt of an external trigger, the instrument waits for the preset gate delay and then integrates the voltage present at its input for the preset gate width.  On completion a DC voltage representing this integral is provided at the Last Sample Output connector and in addition fed forward into an analog integrator state.  Single-channel gated integrator module mounted in NIM enclosure with adjustable sensitivity, offset, gatewidth and output averager.  Manual controls.Analog gate delay generator with manual or DC voltage control.On receipt of an external trigger, the instrument waits for the preset gate delay and then integrates the voltage present at its input for the preset gate width.  On completion a DC voltage representing this integral is provided at the Last Sample Output connector and in addition fed forward into an analog integrator state. 
Single-channel gated integrator module mounted in NIM enclosure with adjustable sensitivity, offset, gatewidth and output averager.  Manual controls.Analog gate delay generator with manual or DC voltage control.On receipt of an external trigger, the instrument waits for the preset gate delay and then integrates the voltage present at its input for the preset gate width.  On completion a DC voltage representing this integral is provided at the Last Sample Output connector and in addition fed forward into an analog integrator state. 

Signal Channel
Mode Normal or Baseline Sampling
Sensitivity ±20 mV to ±2 V in 1-2-5 sequence
Coupling AC/DC 
Impedance
     DC only
     DC or AC
 
50 Ω // 10 pF
1 MΩ // 30 pF
Maximum Safe Input
     50 Ω Input
     1 MΩ Input
±5 V
±100 V
Offset ±10 x FA; non-removable
Overload Indicator LED
Overload Level Input (signal plus noise) > 1.1 x FS
Overload Recovery Recovers after 1 sample for x 10 overload
Gain Drift 0.5% /ºC, gate width > 30 ns; 1.0% /ºC, gate width <10 ns
DC Drift (referred to input)
    
0.2%/ºC, gate width > 20 ns; 1.0%/º
Bandwidth
     50 Ω input
     1 MΩ DC input
     1 MΩ AC input
DC to 450 MHz
DC to 100 MHz
1.5 Hz to 100 MHz
Signal Risetime
     50 Ω input
     1 MΩ input
2 ns; 20% to 80%
10 ns; 20% to 80% from 50 Ω source.
Sampler and Timing
Gate Width
    
1 ns to 30 µs in 1-3-10
sequence, switch selectable
with a continuously
variable x1 to x5 multiplier
Sample Correlation
    
Less than 0.5% of the
sample output due to
trigger t remains at trigger
t + 1
Gate delay
     Input
     
     
    
     Max delay
        
0 to 10 V DC varies delay
by 0.5% to 100% of range
setting

3 ns to 200 ns in a 1-3-10
sequence plus user options
which give 10 µs, 100 µs, 1
ms or 3 ms by capacitor
change.

Trigger Source
     Internal 0.5 Hz to 40 kHZ selectable with range switches 0.5, 5, 50, 500, 5000 off.  Vemier is 10x range.
     External
     ECL
     
     TTL
Positive edge, 5 ns min pulse width with termination of 50 Ω yo -2 V; -5 V to +10 V pk-pk safe input.
Negative edge, 20 ns min pulse width; -5 V to +10 V safe input.
     Max. Trigger Rate 80 kHz
Trigger Indicator LED lights when unit is triggered
Trigger Generator
     Output
BNC TTL out on rear panel active in all trigger modes.  Polarity set by bumper.
     Frequency ranges 0.5, 5, 50, 500 Hz, 5 kHz and off with vemier to overlap ranges.
Baseline Input TTL line to indicate whether sample is signal or baseline value.
Analog Output Averager
Mode Linear or Exponential
Samples Averaged 1, 3, 10, 30, 100, 300, 1k, 10k
LSO Droop Rate < 0.2% FS/s
Averager Droop Rate When there are no triggers the droop rate is <0.001% per minute for 10k samples.
Outputs
Average Out ±10 V FS with 50 Ω output impedance and capable of driving 2 kΩ load
Last Sample Out ±10 V FS
Gate Monitor 0.3 V into 50 Ω to ground.  Marker pulse-width equals gate width.  Position is within 5 ns from actual gate
Trigger TTL
Baseline Output TTL output line that toggles with each trigger to indicate whether next sample is signal or baseline value.
General
Power Requirements +24 V at 200 mA; -24 V at 150 mA
+12 V at 300 mA; -12 V at 590 mA
+6 V at 160 mA; -6 V at 630 mA
Dimensions
     Height
     Width
     Depth
83/4 (222 mm)
23/4 (70 mm)
93/4 (248 mm)
Weight 3 lb (1.4 kg)

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