TM 9-6625-474-14&P-3
CONTROLS AND CONNECTORS
Even though the DC 503A is fully calibrated and ready
to use, the functions and actions of the controls and
connectors should be reviewed before attempting to use
it.
With the exception of the TOTALIZEA/TIME MANUAL
jumper, which is described in the maintenance section, all
controls for operation of the DC 503A are located on the
front panel. A brief functional description of these controls
follows (refer to Fig. 2-2).
N O T E
Because the Channel A and Channel B controls are
identical, only Channel A will be described.
DISPLAY AND UNIT INDICATORS
DISPLAY READOUT: eight-digit, seven segment
LED readout with automatically positioned decimal
point.
OVERFLOW: when illuminated indicates register
overflow.
GATE: indicates the state of the main gate. When lit,
the main gate is open (the DC 503A is in the process
of making a measurement). When the light is off, the
gate is closed.
GHz/nSEC: when illuminated, indicates the dis-
played number is gigahertz (GHz) in FREQ A mode
or nanoseconds (nSEC) in a time mode.
when illuminated, indicates the dis-
played number is Megahertz (MHz) in FREQ A mode
or microseconds
in a time mode.
kHz/mSEC: when illuminated, indicates the dis-
played number is kilohertz (kHz) in FREQ A mode or
milliseconds (m SEC) in a time mode.
Hz/SEC: when illuminated, indicates the displayed
number is Hertz (Hz) in FREQ A mode or seconds
(SEC) in a time mode.
MODE SELECTION AND
CONTROL FUNCTIONS
FUNCTION: selects the measurement, events, or
time counting modes for the counter.
NOTE
The TOTALIZE A/TIME MANUAL position is an
"either/or"
function.
TOTALIZE A or TIME
MANUAL is selected and set by positioning an
Internal jumper. Placement of this jumper is discuss-
ed in the maintenance section.
Unless you are qualified to do so, refer positioning of
this jumper to qualified personnel.
AVGS/TIMING: depending on the position of the
FUNCTION switch, this switch selects the clock rate
which will be counted or the number of
measurements to be averaged.
DISPLAY TIME: sets the length of time the reading
will be displayed after the count is made and before
the next measurement is taken, Display time can be
varied from about 0.1 second, fully counter-
clockwise (ccw), to about 10 seconds fully clockwise
(cw). The HOLD position provides continuous dis-
play until reset by pushing the RESET button,
RESET: momentary switch resets the count to zero
when operating in the TOTALIZE A mode. Also acts
as a master reset, ensuring that the readout has been
cleared before the next measurement. Provides a
check of all display LED’s; when pressed, a row of 8’s
will be displayed in the readout window.
START/STOP: push-push switch acts as a manual
gate when the FUNCTION switch is in the
TOTALIZE A/TIME MANUAL position. Button in
Starts the measurement interval gate; button out
terminates the gate.
Содержание DC503a
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Страница 16: ...DC 503A DC 503A Universal Counter Timer REV A FEB 1981 XIV ...
Страница 27: ...Fig 2 2 Controls and connectors Operating Instructions DC 503A 2977 fli English 2 3 ...
Страница 39: ...Fig 2 2 Commandes et prises Instructions d utilisation DC 503A French 2 3 ...
Страница 51: ...Abb 2 2 Bedienungselemente and Anschliisse Bedienungsanleitung DC 503A German 2 3 ...
Страница 63: ...Fig 2 2 Controls and connectors Operating Instructions DC 503A 2971 01 Japanese 2 3 ...
Страница 125: ...Fig 8 2 Auxiliary Board A12 Assy ADJUSTMENT LOCA 2971 1 6 ...
Страница 169: ...SEE END OF MPL FOR WIRE ASSEMBLIES O1 0 pG C 0 DC 503A ...
Страница 186: ...0 2 TM 9 6625 474 14 P 3 Fig 0 1 DC 503A Universal Counter Timer ...
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Страница 197: ...2 3 TM 9 6625 474 14 P 3 Fig 2 2 Controls and connectors ...
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Страница 219: ...4 2 TM 9 6625 474 14 P 3 Table 4 1 LIST OF TEST EQUIPMENT REQUIREMENTS ...
Страница 240: ...5 7 TM 9 6625 474 14 P 3 Fig 5 9 Rear interface connector assignments ...
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Страница 258: ...Fig 8 2 Fig 8 1 8 7 8 8 blank TM 9 6625 474 14 P 3 ADJUSTMENT LOCATIONS ...
Страница 259: ...8 9 8 10 blank TM 9 6625 474 14 P 3 PARTS LOCATION GRID Table 8 1 COMPONENT REFERENCE CHART See Fig 8 3 ...
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Страница 275: ...8 41 8 42 blank TM 9 6625 474 14 P 3 DC 503A Table 8 9 COMPONENT REFERENCE CHART See Fig 8 3 ...
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Страница 277: ...8 45 8 46 blank TM 9 6625 474 14 P 3 DC 503A Table 8 10 COMPONENT REFERENCE CHART See Fig 8 4 ...
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Страница 299: ...THE METRIC SYSTEM AND EQUIVALENTS ...
Страница 300: ...PIN 056816 000 ...