TM 11-66-1866-12
3-3.
Analyzer Front Panel Co ntrols, Indicators, and Connectors
Control, Indicator, or Connector
Function
Sw Pos
Connection
POWER
(2-position toggle switch)
ON.................................
Connects 115-volt 60-hertz operating power to the analyzer.
OFF...............................
Disconnects operating power.
POWER
(indicator lamp)
Lights when operating power is connected and POWER switch is ON.
SIGNAL
(indicator lamp)
Lights when output signal is marking.
Sw Pos
Connection
MARK POLARITY
(2-position toggle switch)
+
Positions mark pulse positive.
-
Positions mark pulse negative.
OVERFLOW
(indicator lamp)
Lights when errors or hits exceed 99 as indicated by nixie lamps.
Sw Pos
Connection
RESET
(2-position toggle switch)
AUTO ............................
Resets nixie display at 3 to 5 seconds intervals.
MAN ..............................
Resets nixie indicator lamps to zero.
DISPLAY MODE
(5-position rotary switch)
TEST MODE.................
Connects error code to generator for addition of desired distortion and
further introduces two errors for each error code cycle (2047 bit times).
DIST (%) .......................
Normal operating position for analyzing average distortion, peak distortion
on start-stop and synchronous data.
ERROR RATE
Normal position for detecting errors on an incoming error pattern for a time
3 ......................
(HITS/10n) 10
duration of 1,000 bits.
ERROR RATE
Normal position for detecting errors in an incoming error pattern for a time
6 ......................
(HITS/10n) 10
duration of 1,000,000 bits.
PEAK MON (HITS) ......
Counts the numbers of transitions on incoming data which exceed the
selected limit on the THRESHOLD % DISTORTION dials.
THRESHOLD
(Thumbwheel switches)
Selects error rate and peak monitor threshold.
MARK-FINISH
(Indicator lamp)
Lights when average distortion is of the marking type or when the 10s or 106 time is completed in the
error analysis mode.
SPACE-START
(Indicator lamp)
Lights when average distortion is of the spacing type and at the start of 10s or 106 time for error
analysis.
Sw Pos
Connection
INPUT
(7-position rotary switch)
SERIES 60N .................
Connects loop t 60-ma neutral input circuits through SERIES INPUTS
jack.
SERIES 20N .................
Connects loop to 20-ma neutral input circuits through SERIES INPUTS
jack.
SERIES 20P .................
Connects loop to polar input circuits (2 ma to 20 ma) through SERIES
INPUTS jack.
SERIES 30P .................
Connects loop to polar input circuits (2 ma to 30 ma) through SERIES
INPUTS jack.
SERIES ICAL................
INPUTS jack.
BRIDGING ...................
CODE LEVEL
(5-position rotary switch)
SYNC ............................
Permits measurement of synchronous data signals.
5, 6, 7, 8 ........................
Permits measurement of 5, 6, 7, or 8-level start-stop signals.
FILTER
(2-position toggle switch)
IN...................................
Connect input signal to filter to remove small noise impulses before
analysis on speeds to 150 bauds.
3-3