Model 122A Sect. IV Page 15
level for 8 cm deflection. Adjust C22 on VERT 3) Square Wave Response
PRESENTATION switch for flat response.
Set HORIZ. SENS. to .l VOLTS/CM
HORIZ. SENS. VERNIER to CAL
7) Calibrator Amplitude VERT. PRESENTATION to B
NOTE Connect ?square wave generator? to channel B
vertical input terminals. Apply 50 kc square wave
Channel A gain should be adjusted before doing to horizontal input terminals and use same signal
this step. to trigger Sawtooth Generator. Adjust C107 for
------------ minimum capacity. Adjust CllO for optimum square
wave. A maximum of 2% overshoot is permitted.
Set A VERT SENSITIVITY to CAL
A VERT SENSITIVITY VERNIER to CAL 4) Attenuator Compensation
B VERT SENSITIVITY to CAL
Set HORIZ. SENS. to 1 VOLTS/CM
B VERT SENSITIVITY VERNIER to CAL HORIZ. SENS. VERNIER to CAL
VERT PRESENTATION to A
TRIGGER LEVEL to AUTO
Apply 5 kc square wave to horizontal input ter-
minals and also use same signal to trigger a Saw-
Adjust Calibrator Set, R365, for exactly 6 cm of
vertical deflection. tooth Generator connected to vertical input ter-
minals. Adjust C233 on SWEEP TIME switch for
flat response. Switch HORIZ. SENS. switch to
10 VOLTS/CM and adjust C233 for flat response.
Now switch back through the three attenuator ranges
4-12 HORIZONTAL AMPUFIER ADJUSTMENTS and check for 1O:l division. Division should be
within 1%.
1) Balance
5) Phase Adjustment
Set HORIZ SENS switch to 10 VOLTS/CM Set HORIZ. SENS. to .1 VOLTS/CM
HORIZ SENS VERNIER to CAL HORIZ. SENS. VERNIER to CAL
B VERT SENSITIVITY to OFF A VERT. SENSITIVITY to .1 VOLTS/CM
VERT PRESENTATION to B A VERT. SENSITIVlTY VERNIER to CAL
B VERT. SENSITIVITY to .1 VOLTS/CM
Adjust spot to center of screen with HORIZ POS B VERT. SENSITIVITY VERNIER to CAL
control. Turn HORIZ SENS VERNIER fully counter VERT. PRESENTATION to A
clockwise and readjust position of spot with Horiz-
ontal Balance Adjustment, R110. Turn HORIZ Apply 100 kc sine wave to both channel A and
SENS VERNIER to CAL and center spot with channel B input terminals, and to the horizontal
HORIZ POS control. Repeat until there is no input terminals. Adjust amplitude to give about
movement of spot when HORIZ SENS VERNIER 6 cm of deflection along both axes. Switch VERT.
is rotated. Set HORIZ POS control to center. PRESENTATION to B and adjust C107 for closure
The spot should now be on screen. of pattern. Switch VERT. PRESENTATION to A
and adjust C44 for closure of pattern. Check
2) Adjust GAIN phase adjustment on .1 VOLTS/CM and 1 VOLT/
CM ranges also.
Set HORlZ. SENS. control to .1 VOLTS/CM
HORIZ. SENS. VERNIER to CAL
4-13 SWEEP GENERATOR
Apply 1.0 v peak-to-peak from a Voltmeter Cali-
bration Generator (@Specification 23678) to the The Vertical and Horizontal amplifiers must be
adjusted before Sweep Generator Adjustment can
horizontal input terminals. Set Horiz. Gain Ad- be completed.
justment, R114, for exactly 10 cm of deflection.
1) X1 Calibration
Check this setting at high and low line voltages.
Setting of GAIN control should be same at all Set SWEEP TIME switch to 5 MILLISECONDS/
voltages. If not, check power supplies and hori- CM
zontal amplifier tubes. SWEEP EXPAND switch to X1 |
ACEC
