The Jorway Model 84 QUAD Scaler is a single-width, high-speed CAMAC compatible module which meets the requirements of EUR 4100e. It features a discriminator front-end to provide reliable counting, independent of input waveshape. Inputs are fully protected against transients, and the Scaler will count pulses as narrow as 3 nsec, at rates in excess of 100 MHz ( 125MHz typical). Buffered, open-collector, carry outputs are provided which may be wired to patch pins if desired. Data is read out on the CAMAC dataway upon receipt of appropriate command.
All functions are fully decoded to provide unique responses to commands. A Q response is generated for each Read, Clear and Test command. Scaler input gating is controlled by either the dataway Inhibit or via a front panel, high-speed inhibit input. The latter inputs are bridged to permit "daisey chaining" between scalers. Under no circumstances will an inhibit signal cause the scalers to count. Front panel lights indicate when the module is addressed (N) and when tile scaler gate is open.
Several options are available which enable the Model 84 to perform a number of additional functions.
1 . Overflow flip-flops for each channel can be added. These allow an overflow flip-flop to be triggered at either the overflow of 1-it 15 or bit 23, and be read out on the Dataway on the appropriate read line ( Rl 6 or R24). These overflows may also be wired to open collector buffers for readout on patch pins.
2. The unit may be used as a 4-channel time interval meter by simply adding a jumper, which allows the inhibit input to function as a count input. Thus, by applying the signal to be timed to one of the channel inputs, and injecting the clock into the inhibit input ( common to all channels), each channel will now count the clock as long as its input signal is present. A clock as high as 100 MHz may be used, providing a resolution of 10 nsec.
3. The Q response for Clear (F9) and Test (F25) commands may be disabled.
4. Two bridged, front panel LEMO connectors for reset input can be supplied in lieu of the manual reset pushbutton. SPECIFICATIONS MODEL 84 QUAD SCALER
INPUTS
SIGNAL INPUT (each Channel)
Pulse Repetition Rate 0-100 mpps min. (125 mpps typical)
Pulse Pair Resolution 10 nsec. min.
Minimum Pulse Width 3 nsec.
Discriminator Level -500mv (Internally adj. to a min.
-300 mv)
Input Impedance 50 Ohm +/- 1% D. C. coupled
Input Protection +/- 5Ov Transients
CAPACITY 24 Binary Bits (16,777,215 pulses)
INHIBIT INPUT (common to all Channels) Two bridged LEMO connectors on
front panel. Bridged inputs allow
"daisy chaining" of inhibit signal
from scaler to scaler.
Input Impedance 5K min.
Sensitivity -500mv
Input Protection +/- 50v transients
Response Time Less than 10 nsec.
FRONT PANEL CONTROLS
Gate Selector Two position locking toggle switch
allows gating to be controlled in one
position by the front panel inhibit
signal or in the other position by the
front panel inhibit signal "OR"ed
with dataway inhibit (I).
Manual Reset Front panel pushbutton clears all
channels simultaneously.
DATAWAY COMMANDS (all fully decoded)
N-FO-AO Read Scaler 1
N-FO-Al Read Scaler 2
N-FO-AZ Read Scaler 3
N-FO-A3 Read Scaler 4
N-F9-AO-S2 Clear Scaler 1
N-F9-A1-S2 Clear Scaler 2
N-F9-A2-S2 Clear Scaler 3
N-F9-A3-S2 Clear Scaler 4
N-F25-(AO+Al+A2+A3)-S2 Test
DATAWAY CONTROLS
Initialize Z-S2 Clear all scalers & overflows
Clear C-S2 Clear all scalers & overflows
Inhibit I Controls gating of all channels
when front panel gating switch
is in appropriate position.
OUTPUTS
Carry A 1 us. (min. ) carry pulse is generated
for each channel whenever a scaler
exceeds its capacity. This signal has
transition times greater than 2OO nsec
so that it may be applied to the patch
pins.
Data 24 bits read out on the read lines on
command. Least significant digit is
R1.
STATUS
Q Response Q=1 for: N-FO-(AO+A1+A2+A3) and
N-F9-(AO+A1+A2+A3) and
N-F25-(AO+A1+A2+A3)
NOTE
The Q response for F9 and F25 may be deleted.
INDICATORS
N Light Indicates when a module is addressed,
this signal is integrated so it will in-
dicate even if addressed for a short
time.
Gate Light Indicates when the counting gates are
open and the unit will count input
signals that exceed the threshold.
POWER REQUIREMENTS +6V @ 700 ma nominal.
-6V @ 550 ma nominal.
TEMPERATURE RANGE 0'- 60'C
SIZE Single CAMAC width, with protective
side shields.