ECL Timing signal output from the CFD circuit (differential ECL).
Only for the ECL version of the ATR19
NIM For the NIM version of the ATR19: NIM timing signal output from the CFD circuit.
For the ECL version of the ATR19: modified ECL- signal level from the CFD circuit for threshold control
2 LEMO connectors and potis for CFD threshold control
1 LEMO connector and poti for signal width control (for both channels of the same DLATR board)
2 LED for power verification of +5.2V/-5.2V for each DLATR board
Additionally there is a push button for the walk calibration of all channels, a power switch and reading points for the internal
DC voltage supply to all boards on the ATR19 front panel. The rear panel hosts the mains power input and selection switch
(100-125V or 200-250V AC) and an alternative DC power input. Please refer to Chapter 3.5 if you want to use the DC power
input.
Holes in the ATR19 top lid allow access to the amplification gain potis of each channel.
Figure 3.7: inputs, outputs and controls of the ATR19 for each internal DLATR board
The “Mon” output allows a monitoring of the noise level and the signal quality from the delay-line. This output shows the
amplified signal according to the input signal and input settings (jumpers JP5, JP6, JP8 and JP9, see Chapter 3.1). For verifying
the signal, the input of the oscilloscope must be 50Ω coupled and the CFD output (ECL or NIM) should be connected to the
TDC.
The “ECL” output (only for ECL version of the ATR19) provides the timing signal (differential ECL) from the CFD circuit
for use with a TDC of according input requirement. The TDC input should provide -2V via 50Ω or form a similar passive
differential ECL input.
The “NIM” output provides
for NIM version of the ATR19: the timing signal (standard NIM signal) from the CFD circuit for use with a
TDC of according input requirement.
The signal can be verified on an oscilloscope (50Ω coupling).
for ECL version of the ATR19: the modified timing signal from the CFD circuit (ECL -) for monitoring via an
Oscilloscope: select AC coupling with large impedance (e.g. 1MΩ)
The CFD circuit requires the setting of a threshold in order to discriminate noise from real signals. This threshold is set by a
DC level of 0 to +5V. This level can be set and controlled internally via the threshold poti for each channel (default) or by
directly supplying this voltage through the corresponding LEMO input. A jumper (JP11 and JP12) on the level control board
inside the ATR19 (see Chapter 3.5) enables the threshold control by the poti (default setting). In this mode (jumper JP11/JP12
set) the LEMO output carries the DC voltage for control with an Ohm meter. If the jumper is removed the poti is disabled
and the LEMO connector serves as input for the DC voltage from an external source. Please contact
RoentDek for adequate
remote DC level controls (e.g. the USB-I/O modules).
A DC voltage of +5V corresponds to a threshold level of -100mV on the amplified signal (as obtained from the “Mon” output).
The ratio between DC voltage on the LEMO connector and the threshold is -50. Note that in case of DLATR+ and
DLATR2.0 the pulse height indicated on the “Mon” output is only half of the real pulse height.
MCP Delay Line Detector Manual (11.0.1304.1) Page 39 of 83
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