8
used to control the subsequent generation of a TAC analyzer (MCA) to generate a spectrum. An
output if the front panel SCA Inhibit switch is set at independent SCA output signal is furnished through
In. Under this condition the SCA must generate an both the front and rear panel SCA Output BNC
output in order to permit the generation of a TAC connectors for any external applications that may
output at its strobe time, and this can limit the range be desired.
of time signals that are furnished to a multichannel
5. MAINTENANCE
5.1. TESTING PERFORMANCE
The following test procedures are furnished as a
guide during installation and checkout of the 567
TAC/SCA.
TEST EQUIPMENT
The following test equipment
is recommended. Each test procedure refers to this
list by the unit identification number for the required
item(s) of test equipment. An equivalent unit may
be substituted for any item in the list, providing that
it furnishes the function required for each specific
application.
1. Hewlett-Packard 215A Pulse Generator
2. ORTEC 436 100 MHz Dicriminator
3. ORTEC 416A Gate and Delay Generator
CONVERSION TESTS
Use the typical test setup
4. ORTEC 425A Nanosecond Delay
5. Photomultiplier tube with scintillator and
radiation source
6. ORTEC 449 Log/Lin Ratemeter
7. Tektronix Type 475 Oscilloscope
8. ORTEC 7100, 7150, 7450 Multichannel
Analyzer or 918 Multichannel Buffer
9. ORTEC 414A Fast Coincidence
10. ORTEC 444 Gated Biased Amplifier
PRELIMINARY PROCEDURES
Take the following switch position should decrease the pulse
preliminary steps when the 567 is installed.
1. Check the module visually for possible damage
2. With the power turned off, install the 567 into a
NIM-standard bin and power supply such as the
ORTEC 4001A/4002A.
3. Check the installation for proper mechanical
alignment.
4. Switch on ac power and check the dc power
voltage levels at test points on the 4001A.
BASIC SWITCH SETTINGS
Set the 567 controls
as follows:
Range 50 ns
Multiplier 1
Window 10 (fully clockwise)
LLD 0 (fully counterclockwise)
TAC Inhibit Out
Logic Input Anti Coinc
Ext. Strobe 100 µs
shown in Fig. 2 and supply a start and stop pair of
input signals with known time difference into the
567. Observe the TAC output. Then use the
following procedures:
1. Adjust the delay for the stop input to 50 ns.
2. Check to see that the full-scale time range is
50 ns.
3. Measure the signal through the TAC Output
connector. It should be about 10V for a 50 ns
delay or 5V for a 25 ns delay.
4. Turn the Range ns switch through its 50, 100,
and 200 settings and observe the pulse
amplitude at each setting; each successive
amplitude to about ½ of the amplitude for the
previous setting.
5. Return the Range ns switch to 50 and set the
Multiplier switch at 10. The output amplitude
should be reduced to about 1/10 of the reading
for step 3.
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