ORTEC EASY-MCA-2K, Руководство пользователя

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ORTEC
®
EASY-MCA™ Digital Gamma-Ray Spectrometer User’s Manual 931044C / 1014
18
3.1.1. Inputs and Connectors
INPUT Accepts positive unipolar, positive gated integrator, or positive-leading bipolar analog
pulses in the dynamic range from 0 to +10 V; +12 V maximum; semi-Gaussian-shaped time con-
stants from 0.25
μ
s to 30
μ
s, gated-integrator-shaped time constants from 3
μ
s to 30
μ
s, or delay-
line-shaped with width >0.25
μ
s. Z
in
= 1 k
Ω
, dc-coupled. No internal delay. BNC connector.
ADC GATE Optional positive TTL input. Computer-selectable Coincidence, Anticoinci-
dence, or Off mode. Signal must occur prior to and extend 0.5
μ
s beyond the peak of the pulse;
BNC connector. Z
in
= 1 k
Ω
.
PUR Pile-up rejection input; accepts TTL signal; signal must occur prior to peak detect.
Z
in
= 1 k
Ω
. BNC connector.
BUSY Busy input used by live-time correction circuits. Accepts TTL signal; signal must occur
prior to peak detect. Z
in
= 1 k
Ω
. BNC connector.
USB High-speed USB (480 Mbps) interface.
12 V DC External power input from wall-mounted dc power supply, +12 V dc, <1.25 A, center
contact positive.
3.1.2. Battery Backup
The memory in the EASY-MCA has battery backup to maintain data when power is turned off.
Lithium battery, P/N 739480, 3 V nominal. Remove the enclosure and locate the battery on the
lower left corner of the EASY-MCA board. After removing the old battery, you may have to
bend the battery holder down to obtain good contact with the new battery.
3.1.3. Electrical and Mechanical
Dimensions 3.5 cm H × 13.4 cm W × 20.5 cm D (1.4 in. × 5.3 in. × 8.1 in.)
Weight 0.6 kg (1.3 lb).
3.2. Feature Mask Bits
The following table describes the feature bits from the SHOW_FEATURES command discussed
on page 32. If the feature is supported in the EASY-MCA the bit is set to 1; if the feature is not
supported, the bit is 0.