User manual TEKTRONIX 2213 OSCILLOSCOPE OPERATORS

[. . . ] Sectio n 1 ii ii iii Sectio n 3 OPERATO RS FAMILIARIZATIO N (cont) PRECHARGI N G . 1-1 1-1 1-9 1-9 Section 4 2-1 2-1 2-1 2-1 2-1 2-2 2-3 2-3 2-4 2-5 2-6 2-7 . . 3-1 3-3 3-3 3-3 3-3 3-3 Section 2 PREPARATION FOR USE FIRST-TIME START UP . . 4-1 4-1 4-1 4-1 4-4 4-8 4-9 . . Sectio n 5 OPTIONS AND ACCESSORI E S INTROD UCTIO N . [. . . ] 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. 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) . 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 . To maintain the original fre quency c haracteristics of an applied signal, only hig h-q uality, low-loss coaxial cables should be used. Coaxial cables should be terminated at both ends in their c h aracteristic im ped ance . If this is not possi ble, use suitable impedance-matc hing devices. I NPUT COUPLING CAPACITOR PRECHARGING G ROUN DING The most relia ble signal measu reme n ts are made when the 2213 and th e unit unde r test are connected by common refe re nce (ground lead), in addition to the signal lead or When the In put Coup ling switch is set to GND, the input signal is connected to ground through the in p ut coupling ca pacitor in series with 1 resistor to fo rm prechargi ng networ k. Th is n etwo rk allows the in p ut coupling capacitor to charge to t h e average dc-voltage level of the signal applied to t h e probe . Th us any large voltage transients that may accidentally be generated will not be applied to the am p lifier input when the Input Coupling switch is moved from GND to AC . The precharging network also provides measure of protectio n to the exte rnal ci rcuitry by redu cing the cu rrent levels that ca n be drawn from the external circuitry during ca p acitor charging . [. . . ] Preset instrumen t controls and obtain baseline trace, then set the switch to CH 1 . Set both I nput Co up li ng switches to the same position, de pen ding on the ty pe of in put cou p ling desired. Usi ng eith er prob es or ca bles with equal time delays, connect known refe rence signal to the Chan nel 1 input and the unk nown signal to the Chann el 2 input . Select BOTH VERTICA L MOD E; then select either ALT or CH OP, depe nd ing on the frequency of in put signals. [. . . ]