Connect The Instrument To A Power Source Tha Meets; The Voltage And Frequency Requirements Marked On The In; Strument Rear Panel. Refer To The Operating Information Sec; Tion In This Manual For Operating Voltage Information - Tektronix 7844 Instruction Manual

Introduction
The following procedure adjusts the 7844/R7844 to meet
the performance requirements given in Table 5-2.
Index to Adjustment Procedure
A. POWEI=! S U PPLY
1 . Adjust - 50 V Power Supply . . . . . . . . . . . .
2. Adjust Inverter Control . . . . . . . . . . . . . . . . .
3 . ChHCk Remaining Power-Supply Voltages . .
B. Z-AXI S AND CRT DISPLAY
1 . Adjust Beam 1 Z-Axis . . . . . . . . . . . . . . . . . .
2. Adjust Beam 1 Z-Axis Transient Response .
3 . Adjust Beam 1 Intensified Z-Axis . . . . . . . . .
4. Adjust Beam 2 Z-Axis . . . . . . . . . . . . . . . . . .
5. Adjust Beam 2 Z-Axis Transient Response .
6. Adjust Beam 1 and Beam 2 Symmetry . . . .
7. Adjust Beam 2 Intensified Z-Axis . . . . . . . . .
8. Adjust Beam 2 Focus Range . . . . . . . . . . . .
9. Adjust Beam 1 Focus Range . . . . . . . . . . . .
1
1 0. Adjust Beam Edge Focus . . . . . . . . . . . . .
1 1 . Adjust Beam 2 Edge Focus . . . . . . . . . . . . .
1 2. Adjust Beam 2 Auto-Focus Operation . . . . .
1 3 . Adjust Beam 1 Auto-Focus Operation . . . . .
1 4. Adjust Trace Alignment . . . . . . . . . . . . . . . .
1 5 . Adjust Beam 1 Geometry (R2568, R 1 985,
R 1 976, R2560) (R4985, R4976 For instruments
7844 SN Bl l 0000-above; R7844 SN Bl 00000-
above) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 6. Adjust Beam 2 Geometry (R2572, R2985,
R2976 . R2564) (R5976, R5985 For instruments
7844 SN Bl l 0000-above; R7844 SN Bl 00000-
above) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 7 A. Adjust Beam 1 and Beam 2 CRT Centering
(R498E:, R5988) (For
Bl l 001 ) 0-above ; R7844 SN Bl 00000-above) . . .
1 7B. Adjust Beam 1 and Beam 2 CRT Centering
( R 1 98E:, R2988) (For
Bl 09999-below; R7844 SN B099999-below) . . .
1 8. Acljust Y-Axis Alignment . . . . . . . . . . . . . . .
C. CALIBRATOR AND OUTPUT SIGNALS
1 . Adj ust CALIBRATOR Output Voltage . . . . . .
2. Adj ust CALI BRATOR 1 kHz Repetition Rate
D. TRIGG ER SELECTION
Adjust Trigger Response . . . . . . . . . . . . . . . . . . .
REV J U N 1 981
ADJUSTMENT PROCEDURE
Page
5-9
5-9
5-9
5-1 1
5-1 1
5-1 2
5-1 2
5-1 2
5-1 3
5-1 3
5-1 4
5-1 4
5-1 4
5-1 5
5-1 5
5-1 6
5-1 6
5-1 6
5-1 6
instruments 7844 SN
5-1 7
instruments 7844 SN
5-1 7
5-1 8
5-1 9
5-1 9
5-20
Adjustment Procedure-7844/R7844 Service
E. HORIZONTAL SYSTEM (For instruments 7844 SN
Bl l 0000-above; R7844 SN Bl 00000-above)
1 . Adjust Beam 1 Horizontal Centering . . . . . .
2. Adjust Beam 1 Horizontal Amplifier Gain . . . .
3 . Adjust Beam 1 High-Frequency Timing . . . .
4. Adjust Beam 2 Horizontal Centering . . . . . .
5. Adjust Beam 2 Horizontal Amplifier Gain . . .
6. Adjust Beam 2 High-Frequency Timing . . . .
F. HORIZONTAL SYSTEM (For instruments 7844 SN
B1 09999-below; R7844 SN B099999-below)
1 . A d just Beam 1 and Beam 2 Horizontal
Amplifier Gain . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Adjust Beam 1 High-Frequency Timing . . . .
3 . Adjust Beam 2 High-Frequency Timing . . . .
G. VERTICAL SYSTEM
1 . Adjust Beam 1 Vertical Centering . . . . . . . .
2. Adjust Beam 2 Vertical Centering . . . . . . . . .
3 . Adjust Beam 1 and Beam 2 Vertical Amplifier
Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4. Adjust Beam 1 and Beam 2 Vertical Crossover
Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Adjust Beam 1 and Beam 2 Aux Y Gain . . .
6. Adjust Beam 1 Vertical High-Frequency
Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . .
7. Adjust Beam 2 Vertical High-Frequency
Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . .
H . READOUT SYSTEM
1 . Adjust Vertical Separation . . . . . . . . . . . . . . .
2. Adjust Fu" Character Scan and Character
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 . Adjust Column Match and Row Match . . . . .
Setup Procedure
1 . Remove the side and bottom covers from the 7844 or
the top and bottom covers and the side panel from the
R7844. Refer to the Maintenance section in this manual for
panel removal information.
2. Connect the instrument to a power source that meets
the voltage and frequency requirements marked on the in­
strument rear panel. Refer to the Operating Information sec­

tion in this manual for operating voltage information.

NOTE

If the correct line voltage is not available, use a vari­

able autotransformer to provide the correct input

voltage.
Page
5-22
5-2 3
5-2 3
5-24
5-24
5-24
5-26
5-27
5-27
5-30
.
5- 3 0
5- 3 0
.
5- 3 1
5- 3 2
5- 3 2
5- 33
5- 3 5
5- 3 6
5- 3 6
5-7