User manual TEKTRONIX 2213 OSCILLOSCOPE OPERATORS

[. . . ] Sectio n 1 ii ii iii Sectio n 3 OPERATO RS FAMILIARIZATIO N (cont) PRECHARGI N G . OPERATOR 'S ADJU ST MENTS INTROD UCTIO N . PR OBE CO MPEN SATIO N . I NPUT CO UPLI NG CA PACITOR . . . GENER AL INF ORM ATIO N INTROD UCTIO N . [. . . ] The start of the swee p is delayed from th e initial swee p-trigger point by time determined by the setting of the DEL AY TIME Range Selector switch and MULTI PL IER control. 22 DEL AY TIME-Two controls are used in con junction with and D LY'D HOR IZONTAL MOD E to select the amount of delay time between th e start of the swee p and the beginning of the intensifie d zone . D 16 j5 INTENS Range Selector Switch--This three-positio n switch selects 0. 4 ms, 20 s, and 1 . 0 s of delay time . To increase the sweep delay from the calibrated setting of the Range Selector Switch, rotate the MULTI PL IER control clockwise . MULTI PL IER Control-Provi des variable sweep delay from less than 1 to greate r than 50 times the setting of the Range Selector switch. HORIZONTAL Refe r to Fig ure 2-5 for location of items 17 through 22 . 11 SEC/DI V Switches- Use d to select the sweep speeds for t he sweep generator in 1-2-5 sequence. To obtain calibrated sweep speeds, the SEC/DI V Variable control must be in the cali brated detent (fully cloc kwise). SEC/DI V Variable 6o ntrol-Provides contin uously variable, uncali brated sweep spee ds to at least 2 . 5 times slower than the calibrated setting . It extends the slowest sweep spee d to at least 1 . 25 s per division . 10 Mag nifier Switch-To increase displayed swee p spee d by factor of 10, pull out the SEC/DI V Varia ble kn ob. The fastest sweep speed can be exte nd ed to 5 ns per division. Push in the S E C/DI V Variable knob to regain the 1 sweep speed. POSITION Control- Positions the display horizontally in all modes. HORIZONTAL MODE Switch-T hree-positio n switch determines the mode of operation for th e horizontal deflection system . DLY- Horizontal deflection is sweep speed determi ned setting . $ j9 10 Zj sweep generator, without delayed start, at provided by the by the SEC/DI V switc h GRATICULE The graticule is inte rn ally marked on the face p late of th e crt to enable accu rate measurements with out parallax error (see Fig ure 3-1) . It is marked with eight vertical and ten horizo ntal major divisions. Each major division is divided into five subd ivisions . The vertical deflection factors and h orizontal timing are calibrated to the gr aticule so that accurate measurements can be made directly from th e c rt. Also, perce ntage mark e rs for the meas ur eme nt of rise and fall times are located on the left side of t h e g r aticule. probe. The probe's ground lead provides the best grounding method for signal interconnection and ensures the maximum amount of signal-lead shielding in the probe ca ble . sepa rate ground lead can also be connected from the unit under test to the oscillosco p e GND co nnector located on the front panel . SIGNAL CONNECTIONS Ge nerally, probes offer the most convenient mea ns of connecting an in put signal to the instrume nt. They are shielded to prevent pickup of electromagnetic interference, and the su pplied 10 probe offers hig h input impedance that minimizes circ uit loading. This allows the circuit under test to operate with minimum of change from its n ormal co nd ition as measurements are bei ng made. Coaxial cables may also be used to connect signals to the in put co nnectors, but they may have considerable effect on th e accuracy of displayed waveform . [. . . ] Set t he S E C/DI V switc h to sweep speed whic h disp lays abo ut one full cycle on the waveforms. Positio n the displays an d adj ust the S EC/DI V Variable co nt rol so t hat one reference-signal cycle occup ies exactly 8 h orizontal gratic ule divisions at the 50% rise-time points (see Figure 4-8) . Each division of the graticule now represents 45° of the cycle (360° - 8 divisio ns), and J he horizontal graticule cali bration can be stated as 45°/per division . Measure th e ho rizontal differen ce between corresponding points on the waveforms at common horizontal graticule line (50% of rise time) an d calculate the phase difference using the following formula: Ph ase Difference = difference (divisio ns) horizontal horizontal graticule cali bration (deg/div) Example : The horizontal difference is 0. 6 division with graticule calibration of 45° per division as shown in Figure 4-8. [. . . ]