INPUT CHARACTERISTICS
Signal Inputs:
One LEMO style connector per channel; 50 ohms +/-1% direct coupled,
reflections <+/-2% for 3nSec risetime. Can withstand transients to +/-100
Volts (2 amps) for l uSec with no damage to the inputs. Clamps at -5.5
Volts and +0.7 Volts. Offset < +/- 1 mVolt.
Threshold:
Common threshold for all 16 channels from -10mV -1.033 Volts +/-2mV
or +/-2%, whichever is greater. Adjustable from a 15-turn front panel control
whe in LOCAL mode or a 10-bit DAC when in REMOTE mode. A front panel test
point provides a DC voltage ten times the threshold setting+/- 2%. The
threshold can also be measured via CAMAC regardless of LOCAL/REMOTE (uses
10-bit ADC, -1 mV/bit). Input hysteresis is typically 4 mV.
Veto:
One LEMO style connector; Input common to all 16 channels; Accepts
a normal NIM level (-500mV or greater), 50 ohms direct coupled. Inhibit
all channels, must precede the input pulse by 3 nsec and overlap the leading
edge of the input signal by 2 nsec. Minimum width must be > 5 nsec.
Sync:
One LEMO style connector; Input common to all 16 channels. Accepts
a normal NIM level (-500mV or greater), 50 ohms direct coupled. Minimum
width is 10 nsec. The state of the outputs at the time the SYNC occurs
are held for the duration of the SYNC pulse. The output states are transferred
to a DATA LATCH at the trailing edge of the SYNC pulse. The SYNC pulse
duration must be > 40nsec if the DATA LATCH feature is used.
Test Input:
One LEMO style connector; Input common to all 16 channels. Accepts
a normal NIM level (-500mV or greater), 50 ohms direct coupled. Minimum
input width is 5 nsec. Threshold must be set to -50 mV or less for Test
signal to trigger all unmasked channels.
Output Duration:
A front panel switch (UPDATE/TOT) allows either Updating or Time-Over-Threshold
(TOT) operation common to all 16 channels.
Updating: The output width is preset via front panel 15-turn screwdriver
adjustment, continuously variable from 4.5nsec to 110nsec with a stability
of +/-.15%/'C of setting. Width uniformity of .5nSec or 5%, whichever is
greater.
TOT: The normal TOT mode (no internal jumpers) provides an output
equal to the duration of the TOT of the input or the preset width, whichever
is longer. (The preset width is common to all 16 channels). The special
TOT mode (enabled via jumper on a per channel basis) provides an output
equal to 5nsec or the TOT whichever is longer, independent of the preset
width setting.
Sum Outputs:
One LEMO style connector; Output common to all 16 channels; -1 mA output
pulse (-50 mV into 50 ohms) for each channel triggered. Output duration
is equal to the output width of the respective channel. Output risetimes
and falltimes are less than 3nsec into 50 ohms. Maximum output before internal
clamping takes place is -1.8 volts.