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Model 4121B
Boxcar Averager Module

This module is an ideal component for building boxcar averager systems. It includes a wide bandwidth variable gain AC/DC coupled input amplifier with continuous input offset adjustment and a high speed sampling gate with variable width and delay controls. It operates in normal or two baseline sampling modes 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 4121B module and a suitable NIM rack and power supply (such as the model 4006 or 4001A/4002D. The addition of a second model 4121B 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 the model 9650A to build swept-gate waveform recovery boxcar systems, all controlled from the Acquire data acquisition software or via a LabVIEW program using the free driver that can be downloaded from this site.

 

4121B Boxcar Averager Module
 Signal Channel
Mode Normal or Baseline Sample, with baseline control via output or input signal.
Sensitivity ±20 mV to ±2 V full scale in a 1-2-5 sequence
Coupling AC/DC
Impedance 50 W // 10 pF DC only
1 MW // 30 pF DC or AC
Maximum Input without damage 50 W: ±5 V
1 MW: ±100 V (AC coupled mode)
Offset ±10 × FS via 20-turn potentiometer
Overload indicator LED lights for signals > 1.1 x FS
Overload Recovery Time Recovers after 1 trigger for x10 overload
Gain Drift 0.5% /°C, gate width > 30 ns;
1.0% /°C, gate width < 10 ns
DC Drift (referred to input) 0.2%/°C, gate width > 20 ns;
1.0%/°C, gate width < 20 ns
Bandwidth DC to 450 MHz (50 W DC input)
DC to 100 MHz (1 MW DC input)
1.5 Hz to 100 MHz (1 MW AC input)
Signal Risetime 50 W input 1.7 ns; 20% to 80%
1 MW input 10 ns; 20% to 80%
(from 50 W source)
 Timing and Control
Gate width >1 ns to 30 µs in 1-3-10 sequence switch selectable with a continuously variable ×1 to ×5 multiplier
Sample Correlation Less than 0.5% of the sample output due to trigger t remains at trigger t + 1
Delay
    Min Intrinsic
    Delay
20 ns (ECL trigger input)
15 ns (ECL trigger input, delay board bypassed)
    Max Delay
    Range
3 ns to 300 ns in 1-3-10 sequence plus user options, which give 10 µs (default), and 1 µs, 100 µs, 1 ms or 3 ms by capacitor change.
    Manual
    Adjustment
Screwdriver vernier control adjusts delay from  0.5 % to 100 % of range
    External
    Adjustment
0 to 10 V DC varies delay by 0.5 % to 100 % of range
    Input
Trigger
    Internal 0.5 Hz to 40 kHz selectable with range switches 0.5, 5, 50, 500, 5000, off. Vernier is 10× range.
    External ECL Positive edge, 5 ns min pulse width with termination of 50 W to -2 V; -5 V to +10 V pk-pk safe input
    External TTL Negative edge, 20 ns min pulse width ; -5 V to +10 V pk-pk safe input
    Max. Trigger
    Rate
Max 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 jumper.
    Frequency
    ranges
0.5, 5, 50, 500 Hz, 5 kHz and off with vernier to overlap ranges.
Baseline Input TTL line to indicate whether sample is signal or baseline value
 Analog Output Averager
Modes 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 W output impedance and capable of driving a 2 kW load
Last Sample out ±10 V FS
Gate Monitor 0.3 V into 50 W  to ground. Marker pulse-width equals gate width. Position is within 5 ns from actual gate
Internal Rate Generator TTL
Baseline Output TTL output line that toggles with each trigger to indicate whether next sample will be treated as a signal or baseline value.
 Power +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 8¾" (222 mm)
Width 2¾" (70 mm)
Depth 9¾" (248 mm)
 Weight 3 lb (1.4 kg)

 


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 It includes the businesses formerly trading as EG&G Instruments (Signal Recovery),
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