Tion; Adjust Attenuator Input Capacitance (C105A, C105B, C106A, C106B, C107A, C107B, C205A, C205B, C206A, C206B, C207A, C207B) - Tektronix 1A5 Instruction Manual

Calibration — Type 1A5
16. Adjust Attenuator Input Capacitance
a. Equipment setup is shown in Fig. 6-15 except as follows:
Triggering Slope
A Input AC-GND-DC
В Input AC-GND-DC
20 pF Input RC Normalizer and associated equipment is
connected to the В INPUT connector. Typical waveforms and
locations of adjustments are shown in Fig. 6-19.
Fig. 6-19. Attenuator input capacitance adjustment, step 16.
(C) and (D) Improperly adjusted; (E)
ing to Tables 6-6 and 6-7).
6-20
—
GND
DC
(A) Adjustment locations;
Optimum waveform for steps 1 6-g and h.
b. CHECK — ½ mm or less aberration at lower left corner
of a 5 cm negative square wave under setups given in Table
6-5. (See Fig. 6-19.)
c. ADJUST — В attenuator input capacitance as outlined in
Table 6-5. Change the Square Wave Generator output as
necessary to maintain a 5 cm vertical display amplitude.
Observe optimum flatness and squareness at the lower left
corner of the square wave. Adjust for
tion. See Fig. 6-19 (A), (B), (C) and (D).
(B ) Optimum waveform for steps 16-b and c;
(Sweep rate 0.2 ms/cm; vertical sensitivity set accord-
½ mm or less aberra ­