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SR250 — Gated integrator with gate width to 2 ns

SR250 — Gated integrator with gate width to 2 ns

Product Details:

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Product Description

SR250 — Gated integrator with gate width to 2 ns:

Gated Integrators and Boxcar Averagers

· Gate width from 2 ns to 15 μs (expandable to 150 μs)
· Internal rate generator
· Active baseline subtraction
· Shot-by-shot output
· Gate output for precise gate timing
· Average 1 to 10,000 samples
· DC to 20 kHz repetition rate
· Low jitter (<20 ps + 0.01 % of delay)

The SR250 Gated Integrator is a versatile, high-speed NIM module designed to recover fast analog signals from noisy backgrounds.

Specifications:

Trigger
Internal trigger 0.5 Hz to 20 kHz
Line trigger The gate generator may be triggered from AC line with adjustable phase.
External trigger 1 MΩ input impedance. Trigger threshold adjustable from 0.5 to 2 V.
Input protected to ±100 VDC.
Trigger pulse must be over threshold for >5 ns with a rise time <1 μs.
Manual trigger The unit will trigger if trigger threshold is scanned through 0 VDC.
Trigger LED LED blinks with each trigger.
Delay
Delay scale 1 ns to 10 ms
Delay multiplier 0 to 10× using 10-turn dial
Insertion delay 25 ns
Accuracy 2 ns or 5 % of full-scale delay, whichever is larger
Jitter <20 ps or 0.01 % of full-scale delay, whichever is larger
Ext. delay control Rear-panel 0 to 10 VDC input overrides front-panel delay multiplier.
Used by SR200 / SR245 to scan gate.
Gate Width
Width scale 1, 3, 10, 30, 100, 300 ns, 1, 3 μs
Width multiplier Adjustable from 1× to 5×
Width accuracy 2 ns or 20 % of full scale, whichever is greater
Minimum width 2 ns, FWHM
Signal
Sensitivity (Vin/Vout) 1 V/V to 5 mV/V in a 1-2-5 seq.
Accuracy 3 % for gate widths >10 ns, decreasing to 50 % for a 2 ns gate
Filter DC coupled, or AC coupled above 10 Hz or 10 kHz
Offset control ±0.4 VDC using 10-turn dial
Over range LED Indicates input is >2 VDC or LAST
SAMPLE is greater than 10 VDC
Last Sample
Output ±10 VDC, 10 mA (20 mA short circuit limit), impedance <1 Ω
Polarity switch Inverts LAST SAMPLE output
Responsivity 95 % (no more than 5 % of the previous last sample remains)
Averaging
Type Exponential moving average
Number of samples 1, 3, 10, 30, ... to 10,000
LAST is selected for no averaging
Average output ±10 VDC full scale, 10 mA (20 mA short circuit limit). Impedance <1 Ω

 



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