
Performance Check— Type 1A1
6. Check Chopped Mode Repetition Rate
a. Requirement—Chopped mode repetition rate, 1 MHz,
±
20
%.
b. CHECK—The time duration of one cycle should be
0.833
jx
s to 1.25 /xs (See Fig. 6-1B).
f. If necessary, adjust the front-panel V/CM GAIN ad
justment for exactly 4 cm of deflection.
g. Turn the MODE switch to CH 2 and apply the Stand
ard Amplitude Calibrator signal to Channel 2 INPUT.
h. Repeat the above procedure for Channel 2.
7. Check Front Panel Gain Adjustment
a. Requirement— Vertical
deflection
within
± 3 %
VOLTS/CM switch indication.
b. Set the controls as follows:
Type 1A1
INPUT SELECTOR
(both channels)
DC
MODE
VOLTS/CM
CH 1
(both channels)
.05
Type 547 Oscilloscope
Triggering Level
Fully clockwise
knob pushed
Time/Cm
.5 mSec
Standard Amplitude Calibrator
Amplitude
.2 Volts
Mode
Square Wave
Mixed
Up
X 100 Amplifier
Not Applicable
Power
On
c. Connect the .2-Volt signal from the Standard Ampli
tude Calibrator output connector through a 42-inch 50-ohm
cable to the Type 1A1 Channel 1 Input connector.
d. Use the Channel 1 POSITION control to center the
display.
e. CHECK—CRT display for exactly 4 cm of vertical de
flection (see Fig. 6-2).
Fig. 6 -2 . Typical display showing correct gain adjustment.
8. Check Variable Volts/Cm Range
a. Requirement— At least 2.5:1 reduction in deflection
of
when VARIABLE control is set fully counterclockwise.
b. Rotate the Channel 2 VARIABLE VOLTS/CM control
to its fully counterclockwise position and note the vertical
deflection amplitude.
c. Rotate the Channel 2 VARIABLE VOLTS/CM control
in a clockwise direction until maximum deflection is ob
tained. Note the amplitude.
d. CHECK—The smaller amplitude noted in (b) divided
into the larger amplitude obtained in (c) will be the attenu
ation ratio. Ratio must be no less than 2.5:1.
e. Return the VARIABLE VOLTS/CM control to the CALIB
position.
f. Set the MODE switch to Channel 1 and apply the
Standard Amplitude Calibrator signal to Channel 1 INPUT.
g. Repeat the above procedure to check Channel 1 VAR
IABLE VOLTS/CM control.
9. Check Volts/Cm Deflection Accuracy
a. Requirement— Vertical
deflection
within
± 3 %
of
VOLTS/CM switch indication.
b. Check both VARIABLE VOLTS/CM controls to insure
they are in the CALIB detent.
c. CHECK— The attenuator accuracy by means of Table
6
-
1
.
TABLE 6-1
Attenuator Accuracy Check
Type 1A1
VOLTS/CM
Switch
Standard
Amplitude
Calibrator
Display
Amplitude
in Centi
meters
Allowable
Error in
Millimeters
.005
20 m Volfs
4
1.2
.01
50 m Volts
5
1.5
.02
.1 Volts
5
1.5
.05
.2 Volts
4
0.0 (Was ad
justed during
step 7.)
.1
.5 Volts
5
1.5
.2
1 Volt
5
1.5
.5
2 Volts
4
1.2
1
5 Volfs
5
1.5
2
10 Volts
5
1.5
5
20 Volts
4
1.2
10
50 Volts
5
1.5
20
100 Volts
5
1.5
6-4
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