eXact 240 - 3.2 Timing Calibration

240-0764
SECTION I I I
CALIBRATION
3.1.5 POWER SUPPLY RIPPLE CHECK (CONTINUED)
3.2 TIMING
(s) AT THE FUNCTION GENERATOR REMOVE V105.
(c) USING THE OSCILLOSCOPE, VERIFY THAT RIPPLE VOLTAGES DO
NOT EXCEED THE VOLTAGE SPECIFIED FOR EACH SUPPLY LISTED
BELOW:
-210
VOLTS
10MV
MAX.
+100 VOLTS
10MV
MAX.
+250
VOLTS
10MV MAX.
-
11
VOLTS
100MV
MAX.
(D) AT THE FUNCTION GENERATOR REPLACE V105.
3.2.1 PRELIMINARY S ETTINGS AND ADJUSTMENTS
(A) SET THE FUNCTION GENERATOR CONTROLS AS FOLLOWS:
MULTIPLIER
10
(s) CHECK THE CYCLES/SEC DIAL FOR MECHANICAL CENTER AND SET
TO X10.
(c) SET THE OSCILLOSCOPE CONTROLS AS FOLLOWS:
VERTICAL SENSITIVITY
INPUT COUPLING
SWEEP TIMING
TR I GGER
3.2.2 TRIANGLE WA VEFORM BALANCE
1 v/cM
DC
10 MSEc/cM
INTERNAL
THE INSTRUMENT HOULD BE ON AT LEAST 15 MINUTES BEFORE ANY
OF THE FOLLO W ING A DJU S TMENTS ARE MA DE.
CONNECT THE VERTICAL AMPLIFIER OF THE OSCILLOSCOPE TO PIN #8
OF V102 ANO ADJUST THE MILLER DC BAL R132 UNTIL THE BOTTOM
OF
THE TRIANGLE WAVEFORM IS AT +52 ±2V. THE AMPLITUDE OF THE
WAVEFORM AT THIS LEVEL WILL VARY SLIGHTLY FROM INSTRUMENT TO
INSTRUMENT. HOWEVER THE MOST IMPORTANT SETTING IS TO HAVE
THE
NEGATIVE PEAK OF THE TRIANGLE WAVEFORM AT +52 ±2V.
3.2.3 PRELIMINARY TIMING
(A) CONNECT THE VERTICAL AMPLIFIER OF THE OSCILLOSCOPE TO THE
TRIANGLE WAVEFORM OUTPUT TERMINAL. VERTICAL SENSITIVITY
SHOULD BE SET TO 10 v/cM.
(s) ADJUST THE MAIN TIMING A DJ R105 AND VERIFY THAT TEN TRI-
ANGLES APPEAR FOR 10 CM OF SWEEP ON THE OSCILLOSCOPE.