2
either 10 or 100 µs after stop for an automatic reset The peak amplitude of the TAC signal is sampled
if no strobe has been furnished. If reset occurs by the SCA at the time of a true-stop input. If the
before a strobe, no TAC output signal is available. amplitude is within the adjusted acceptance range
There are two other sources for reset: one occurs if of the SCA, an SCA logic output is generated. The
the start-to-stop time interval exceeds the range width of the SCA output is from the start of a TAC
that is selected and the other occurs as a result of linear output to either end of reset or end of linear
an input pulse through the Reset/Inhibit Logic Input output; PWB selectable; factory-set at end of reset.
connector on the front panel. The normal setting for
the rear panel switch is 100 µs; the 10 µs setting The SCA has a lower-level discriminator that can
should be used only if the stop-strobe mode is used be adjusted through the full linear range of the TAC
and the delay is adjusted to minimum, or if the signals from 0.05 through 10.05 V. The range for
external-strobe mode is used and the strobe will be the SCA window discriminator is also 0.05 through
furnished within the selected interval. 10.05V.
2. SPECIFICATIONS
2.1. PERFORMANCE 2.2. FRONT PANEL CONTROLS
Time-to-Amplitude Converter
TIME RESOLUTION
FWHM
0.01% of full scale
plus 5 ps for all ranges.
TEMPERATURE INSTABILITY
+0.01%/
(
C (±100
ppm/
(
C) of full scale plus 10 ps/
(
C, 0 to 50
(
C.
DIFFERENTIAL NONLINEARITY
Typically ±1%
from 10 ns or 2% of full scale (whichever is greater)
to 100% of full scale.
INTEGRAL NONLINEARITY
±0.1% from 10 ns or
2% of full scale (whichever is greater) to 100% of
full scale.
RESET CYCLE
Fixed 1.0 µs for X1 and X10
Multipliers, fixed 5 µs for X100 Multiplier, and fixed
50 µs for X1k and X10k Multipliers. Occurs after
Overrange, Strobe cycle, or Ext Strobe Reset cycle.
START-TO-STOP CONVERSION TIME
Minimum
5 ns.
INPUT COUNT RATE
>30 MHz.
Single-Channel Analyzer
THRESHOLD INSTABILITY
±0.01%/
(
C (±100
ppm/
(
C) of full scale, 0 to 50
(
C (referenced to
+12V NIM bin).
THRESHOLD NONLINEARITY
±0.5% of full
scale.
Range (ns)
Three-position rotary switch selects full
scale time interval of 50, 100, or 200 ns between
accepted Start and Stop input signals.
MULTIPLIER
Five-position rotary switch extends
time range by a multiplying factor of 1, 10, 100, 1k,
or 10k.
DELAY
20-turn screwdriver-adjustable potentiometer
varies the delay of the TAC and SCA outputs from
0.5 µs to 10.5 µs, relative to an accepted Stop input
signal; operable in the Int Strobe mode only.
STROBE MODE
Two-position locking toggle switch
selects either Internal or External source for
initialing the strobe cycle to strobe valid information
from the TAC and SCA outputs.
START GATE MODE
Two-position locking toggle
switch selects Coincidence or Anticoincidence
mode of operation for the Start circuitry. Start
circuitry is enabled in the Coinc postion or inhibited
in the Anti position during the interval of a Start
Gate input signal.
STOP GATE MODE
Two-position locking toggle
switch selects Coincidence or Anticoincidence
mode of operation for the Stop circuitry. Stop
circuitry is enabled in the Coinc position or inhibited
in the Anti position during the interval of a Stop
Gate input signal.
SCA WINDOW
(
{
{
T)
Ten-turn precision locking
potentiometer sets the SCA upper-level
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