Tekron IRIG-B, Руководство пользователя

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16 APPENDIX
IRIG-B signal properties
Example Properties
SIGNAL TYPE Copper IRIG-B Fiber IRIG-B
DC Level Shift
or
Fiber Manchester
Signal Type
○
IRIG-B00x (DCLS)
○
IRIG-B12x (AM)
○
IRIG-B22x
Modified Manchester
○
IRIG-B00x Fiber
Unmodulated
○
IRIG-B22x
Fiber Manchester
IRIG 200-04
IEEE C37.118.1
Displays the standard the
IRIG-B signal conforms to
POLARITY
INVERTED This field is displayed only
when the polarity of the
signal is reversed. Check
your tests leads are not
reversed. If measuring a RS-
232 IRIG-B signal it is normal
for the analyzer to report the
polarity as inverted
SIGNAL PROPERTIES
Amplitude 5.0V Amplitude of the IRIG-B
signal This value excludes any DC offset on the
IRIG-B signal and
This value represents the peak to peak
value of the IRIG-B signal and excludes any
DC offset. Not applicable to fiber.
Zero Avg 2.0ms Average pulse width of a
logic zero data field The IRIG-B signal carries 100 bits of data
every second by way of pulses. The logic
state of a particular field is determined by
the width of these pulses which are
nominally 2ms for a logic zero and 5ms for
a logic one.
One Avg 5.0ms Average pulse width of a
logic one data field