3. Preliminary Display Adjustments (SN 3001A and Below)

Pulse Response of Control Gate Z Amplifier to BLANK Input

19.Connect the oscilloscope’s channel 1 probe to AlA5El and the channel 4 probe to AlA5E2. See Figure 3-18 for the location of the test points. Connect the output of the pulse/function generator to 52 (Y input) on the Display Adjustment PC board in the A3A2 slot.

20.The Y Deflection Amplifier is identical to the X Deflection Amplifier. Repeat steps 12 through 18 for the Y Deflection Amplifier using R7, R27, R28, ClO, and Cl1 respectively.

21.Disconnect the oscilloscope channel 4 probe from the spectrum analyzer. Connect the oscilloscope channel 1 probe to AlA2TP2, and connect the probe’s ground lead to chassis ground.

22.On the oscilloscope, press [RECALL) (CLEAR) to perform a soft reset.

2% Press (TiTiiQ CHANNEL 1 on, more preset probe , and use the

front-panel knob to set the probe to 10.00: 1. Press more .

24. Set the oscilloscope controls as follows:

Press (CHAN):

amplitude scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.0 V/div offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...25.0000 V

Press [TlMEBASEI):

time scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..50.0ns/div delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125.000 ns

Press ITRIG]:

level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.00000 V c

Press (-1:

connect dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..on Press @ii??@.

25.Connect the output of the Pulse/Function Generator to 53 (Z input) on the Display Adjustment PC Board in the A3A2 slot. Set the board’s switch to the down position.

Note The pulse/function generator’s output must be terminated with 50 ohms. Use a BNC tee, a 5062 termination, and a BNC female to SMB female adapter. Install the 500 termination as close to the Display Adjustment PC Board as possible.

26. Set the pulse/function generator’s controls as follows:

MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NORM

Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..pulse

Frequency (FRQ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,200 kHz

Width(WID) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..250ns

Amplitude (AMP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.OOV

Offset (OFS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2.OOV

27.Set the spectrum analyzer’s front-panel INTENSITY control fully clockwise. Note the display on the oscilloscope. The pulse should be >55V peak-to-peak.

3-50 Adjustments