TM 11- 6625-1668-12
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Error Rate Mode--The instrument uses a 2047 bit pseudo-random test pattern from
another analyzer and compares it with an internally generated "perfect" pattern.
The unit automatically synchronizes with the receive pattern on a bit and frame
basis and measures the number of errors (as defined by the error definer) in each
one-thousand or one-million bit times. The result is displayed on the digital
readout with an overflow indicator, indicating when the error rate exceeds 99.
The error definer feature allows for a bit error to be narrowly defined by comparing
the logic state of the input error signal with the state of an internally generated
perfect pseudo-random test message. Errors may also be defined as those trans-
tions whose distortion exceeds a preset % distortion threshold. The threshold may
be set at 1% intervals from O to 49%. An error test mode is built into the unit. A
companion unit (the generator) is used to self-check the error rate and error
defining functions of the analyzer.
Plus or minus 1% (Distortion) or one count (Error rate or Hits).
Accuracy .....................................
Measurement indictor ..................
A 2 digit nixie display is used for % Distortion, hits count, or error rate depending on
selected operating mode.
Lamp indicator.............................
Signal indicator lamp lights for "marking" input signal.
Overflow indicator lamp lights when error rate or hit count exceeds 99.
Clock indicator lamp lights when timing signal is missing.
Mark and space lamps indicate type of distortion mode. They also indicate start and
end of test in the error rate mode.
Display reset................................
Automatic (3 to 6 seconds) or manual reset of nixie display for peal: distortion
measurement. Manual reset used to start new test in ERROR Rate mode and
peak monitor mode.
Internal timing..............................
Crystal controlled timing source for operation at speeds of 37.5, 45.5, 50, 61.1,
75,150, 300, 600, 1200, 2400, 4800, and 9600 bands with built-in provision for one
spare speed which can be activated by adding a crystal and jumper wire to
produce any speed in range of 30 to 9600 bands. Stability .01% per day.
External timing.............................
The analyzer may be operated from an external oscillator at a frequency in hertz of
200 times the desired operating speed in bands. Requires polar signal +6 volts,
20% Input impedance of 6000 ohms.
Inputs ..........................................
Series, current (limited to a maximum speed of 160 bands). 20 ma neutral 200 ohms
nominal 60 ma neutral 67 ohms nominal 20/30 ma polar 200 ohms nominal Front
panel switch for selection of input polarity. (Fused for 100 ma on input assembly)
Bridging (voltage)-Polar MIL-STD 188B 0.5 volts to 150 volts (68K ohms).
Input character interval ................
Start-Stop-- 5, 6, 7, 8 level with any stop length.
Synchronous-All codes. Automatic synchronizer provides phase-locking between
analyzer timing and input signals with timing differential not greater than 0.1%.
Input signal filtering .....................
Front panel control allows for filtering transients less than 1/2 millisecond on speeds
up to 150 bands.
Transition selection......................
In the distortion mode measures "ALL" or individual transitions Ott start-stop input
signals.
115/230 VAC 10%, 47-420 Hz, 45 watts.
Input power..................................
Physical.......................................
5 1/2 high, 19" wide, 18 1/2 behind front panel. Handles and removable flanges for
portable applications. Weight: approximately 29 pounds.
c. Oscilloscope Characteristics.
Display ........................................
Displays input signal from the analyzer on a 6-inch CRT (P-7 phosphor) using
electrostatic deflection and intensity modulation. DC to 450 Hz.
Vertical
Calibrated graticule provides measurement of signals applied to the Analyzer.
SCALES-
Current: 2, 6,10, 20, 60 ma/cm.
Voltage: 2, 6,10, 20, 60, 200 volts/cm.
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