CH Discriminator Dual Pulsing
Discriminators
All needed specifications can be found within the appropriate manual
CAEN N841 Leading Edge Discriminator
Modes: Update and Non-Update
- For use with He3 tube, Update vs Non-update mode did not seem to make a difference in discriminator output.
- See pages 10 & 12 in user manual
Lecroy 821 Quad Discriminator
File:LRS 821 Specifications.pdf
Tektronix DPO 4104 Digital Phosphor Oscilloscope
For reference: Input to discriminators is spec amp output with the following settings
Course gain: 10
Fine gain: 1
Shaping type: Gaussian
Shaping time: 2us
Purple: Input signal from spec amp. Yellow: CAEN Dual Timer using Lecroy Disc as input. Aqua: Lecroy Disc Output. Lime:: CAEN Update Mode Disc Output.
Purple: Input signal from spec amp. Yellow: CAEN Dual Timer using Lecroy Disc as input. Aqua: Lecroy Disc Output. Lime:: CAEN Update Mode Disc Output.
Purple: Input signal from spec amp. Yellow: CAEN Dual Timer using CAEN Disc as input. Aqua: Lecroy Disc Output. Lime:: CAEN Update Mode Disc Output.
Continued Investigations
03/01/2022
- Sourced a function generator
Function generator: Protek 93120 Digital Synthesis Arbitrary Function Generator/Counter
Measurements
I used a DC offset to create a purely negative pulse using a square wave signal ranging from 0 to -1V
| Run Number | Configuration | Generator Rate | Generator Pulse Amplitude (Set) | Generator Pulse Height (Measured) | Counts | Run Time (Sec) | Count Rate (Hz) | Uncertainty |
| 1 | Function Gen feeding Scalar | 1.00 KHz | 1.00V | ~1V | 100000 | 100 | 1.000KHz | |
| 2 | Function Gen feeding Scalar | 1.00 KHz | 1.00V | ~1V | 100000 | 100 | 1.000KHz | |
| 3 | Function Gen feeding Scalar | 1.00 KHz | 1.00V | ~1V | 100000 | 100 | 1.000KHz | |
| 4 | Function Gen feeding Scalar | 1.00 KHz | 1.00V | ~1V | 100000 | 100 | 1.000KHz | |
| 5 | Function Gen feeding Scalar | 1.00 KHz | 1.00V | ~1V | 100000 | 100 | 1.000KHz |
I used a DC offset to create a purely negative pulse using a sine wave signal ranging from 0 to -1V that is discriminated by the Lecroy disc.
| Run Number | Configuration | Generator Rate | Generator Pulse Amplitude (Set) | Generator Pulse Height (Measured) | Counts | Run Time (Sec) | Count Rate (Hz) | Uncertainty |
| 1 | Function Gen, Lecroy Disc, Scalar | 1.00 KHz | 1.00V | ~1V | 100 | |||
| 2 | Function Gen, Lecroy Disc, Scalar | 1.00 KHz | 1.00V | ~1V | 100 | |||
| 3 | Function Gen, Lecroy Disc, Scalar | 1.00 KHz | 1.00V | ~1V | 100 | |||
| 4 | Function Gen, Lecroy Disc, Scalar | 1.00 KHz | 1.00V | ~1V | 100 | |||
| 5 | Function Gen, Lecroy Disc, Scalar | 1.00 KHz | 1.00V | ~1V | 100 |
Electronics Chain Investigation
Components
Function Generator: Protek 93120 using Arb function 19 (Log)
CAEN Quad Linear Fan In/Out Model: N625
Ortec Timing Filter Amp Model: 474-06
Ortec Spec Amp Model: 672-05
Discriminators:
- LeCroy Model: 821
- CAEN Model: N841
CAEN Dual Timer Model: 93B
Scope Images
LeCroy Discriminator
400us per divisionYellow: Function Generator output. Aqua: Timing Filter Amp output. Purple: Spec Amp output. Lime:: LeCroy Disc output.
10us per divisionYellow: Function Generator output. Aqua: Timing Filter Amp output. Purple: Spec Amp output. Lime:: LeCroy Disc output.
2us per divisionYellow: Function Generator output. Aqua: Timing Filter Amp output. Purple: Spec Amp output. Lime:: LeCroy Disc output.
CAEN Discriminator
<gallery heights="300" widths="350" class="center">
FuncGen_TFAmp_SpecAmp_CAEN80mV_4ms_03152022.png|4ms per divisionYellow: Function Generator output. Aqua: Timing Filter Amp output. Purple: Spec Amp output. Lime:: CAEN Disc output.
FuncGen_TFAmp_SpecAmp_CAEN80mV_10us_03152022.png|10us per divisionYellow: Function Generator output. Aqua: Timing Filter Amp output. Purple: Spec Amp output. Lime:: CAEN Disc output.
FuncGen_TFAmp_SpecAmp_CAEN_2us_03152022.png|2us per divisionYellow: Function Generator output. Aqua: Timing Filter Amp output. Purple: Spec Amp output. Lime:: CAEN Disc output.
SpecAmp CAEN80mV DualTA DualTB 40us Single03152022.png|40us per divisionYellow: Spec Amp output. Aqua: CAEN Disc Output. Purple: Upper CAEN Dual timer output. Lime:: Lower CAEN Dual timer output.
SpecAmp_CAEN80mV_DualTA_DualTB_40us_Multi03152022.png|40us per divisionYellow: Spec Amp output. Aqua: CAEN Disc Output. Purple: Upper CAEN Dual timer output. Lime:: Lower CAEN Dual timer output.