eXact 240 - 3.4 Sine Waveform Calibration

240-0664
SECTION I I I ------------------------------------------------CALIBR A TION
3.3.1 PRELIMIN A RY S ETTING S / ND A DJU S TM E NTS (CONTINUED)
(B) SET THE FUNCTION GENERATOR CONTROLS AS FOLLOWS:
MULTIPLIER
CYCLE3/SEC DIAL
10
10
3.3.2 LIN EAR ITY CHECK (100 CYCLES/SEC)
(A) CONNECT THE VERTICAL AMPLIFIER OF THE OSCILLOSCOPE TO THE
TRI A NGLE WAVEFORM OUTPUT TERMINAL OF THE FUNCTION GENERATOR.
(s) ADJUST THE VERTICAL GAIN AND THE SWEEP VERNIER OF THE OSCIL-
LOSCOPE TO DISPLAY ONLY THE R I SING HALF CYCLE OF TRIANGLE
WAVEFORM OVER THE ENTIRE GRATICULE AREA.
(c) OBSERVE THE LINEARITY OF THE WAVEFORM .
(o) S ET THE osc1LLoscoPE TRIGGERING TO EXTERNAL (Pos1T1vE).
(E) OBSERVE THE LINEARITY OF THE FALLING HALF CYCLE OF THE TRI-
ANGLE WAVEFORM OCCUPYING THE ENTIRE GRATICULE AREA.
3.3.3 LINE A RITY CHECK (10 CYCLES/SEC)
(A) SET THE osc1LLoscoPE SWEEP TIMING To 5.0 MSEc/cM AND THE
FUNCTION GENERATOR CYCLE S/ S EC DIAL TO X1.
(s) REPEAT PARAGRAPHS 3.3.2 (A) THROUGH (E) AT THE X1 END OF
THE CYCLE I EC DIAL·
NOTE: VERIFY THAT THE NON-LINEARITY IS LESS THAN 1% THROUGH-
OUT THE TESTS IN PARAGRAPHS 3.3.2 (A) THROUGH 3.3.3
(B). IF EXCEEDING 1%, TRY CH A NGING V102 AND REPEAT
CALIBRATION PARAGRAPHS 3.2.1 THROUGH 3.2.5.
3.4 S INE WA VEFORM C~ LIBR ' TION
NOTE:
A SINE WAVE WITH MINIMUM DISTORTION IS DEPENDENT UPON THE
ACCURACY OF THE PRECEDING AD~USTMENTS AS . WELL AS THE FOLLOW- -
ING "
SINE SH A PE A DJ U STME NT S . AN Y SUBSEQUENT CHANGES OR RE-
CALIBR A TION OF PREVIOUS STEPS WILL MAKE IT NECESSARY THAT
SINE CALIBRATION BE RECHECKED.
3.4.1 PRELIMIN A RY S ETTING S A ND ADJU S TMENT S
(A) SET THE OSCILLOSCOPE CONTROLS AS FOLLOWS:
VERTIC AL S ENS ITIVITY
SWEEP TIMING
INPUT COUPLING
TRIGGER
10 v/cM
2 TO 5 MSEc/cM
DC
EXTERNAL
(s) SET THE CONTROLS OF THE FUNCTION GENERATOR AS FOLLOWS:
MULTIPLIER
CYCLES/SEC DIAL
10
10