Tektronix 1L10, Instruction Manual

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Maintenance and Calibration— Type 1L10
10. Set the RF CENTER FREQ control to 10 me and tune
for the 2nd harmonic of the 5 me signal. The RF CENTER
FREQ dial reading should be ± 1 % o f dial reading ± 1 0 0 kc.
Turn the RF CENTER FREQ control to 15 me, 20 me 25
me, 30 me, and 35 me and check to see where on the dial
the 3rd, 4th, 5th, 6th, and 7th harmonics of the 5 me signal
occur. In all cases, the tolerance is ± 1 % of dial reading
± 1 0 0 kc.
Dynamic Range Check
TABLE 4-3
Type 1 LI 0
R-F ATTEN
Switched to O N
r - f G e n e ra to r
A tte n u a to r
S etting
2 db —68 dbm ± 0 .2 dbm
4 db —66 dbm ± 0 .4 dbm
8 db —62 dbm ± 0 .8 dbm
16 db —54 dbm ± 1 .6 dbm
20 db —50 dbm ± 2 .0 dbm
ALL O N — 19 dbm ± 5 .1 dbm
1. Set the VERTICAL DISPLAY switch to LIN.
2. Set up the Type 1 LI 0 to display a 6 cm signal. Leave
the 2 db, 4 db, and 20 db switches at OFF.
3. Set the 2 db, 4 db, and 20 db switches to on. The dis­
played signal must still be discernible on the trace. Set the
R-F ATTEN switches to OFF.
4. Set the VERTICAL DISPLAY switch to LOG and set up
the Type 1 LI 0 to display a 6 cm signal. In addition, the
G AIN a n d /o r COUPLED RESOLUTION should be set so as
to limit the noise on the trace to 2 mm or less. Leave the
R-F ATTEN switches in the OFF position.
5. Switch in all of the R-F ATTEN switches except the 1 db
switch. The signal must still be discernible on the trace.
Set all R-F ATTEN switches to OFF.
6. Set the VERTICAL DISPLAY switch to LIN and set the
G A IN control for a 6 cm signal.
7. Set the VERTICAL DISPLAY switch to LIN X 1 0 and
switch in the 20 db R-F ATTEN switch. The displayed signal
must be 6 cm ± 1 0 % .
R-F ATTEN Check
1. Set the front-panel controls as follows:
RF CENTER FREQ Any position
FINE RF CENTER FREQ Midrange
R-F ATTEN All OFF
VERTICAL DISPLAY LIN
DISPERSION-KC/CM 2
(UN)COUPLED 1
RESOLUTION
Oscilloscope Sweep Rate 5 mSEC/CM
2. Apply a —70dbm 60-mc signal from the Calibrated
Output r-f generator to the Type 1 LI 0 RF INPUT 5012
connector.
3. Set the Type 1 L I0 G A IN control so that the 60-mc
signal is exactly 5 centimeters high.
4. Switch the 1 db R-F ATTEN switch to O N and adjust
the attenuator control of the r-f generator so that the 60-mc
signal is exactly 5 centimeters high. The r-f generator at­
tenuator control should read —69 dbm to ± 0 .1 dbm.
5. Switch the 1 db R-F ATTEN switch to OFF.
6. Check the rest of the R-F ATTEN steps in the same way,
as directed in Table 4-3.
TO RECORDER Check
1. A pply a 60-mc signal from the r-f generator to the
Type 1 L I0 RF INPUT 60012 connector.
2. Turn the Type 1 LI0 G A IN control fully clockwise.
3. Adjust the amplitude of the signal generator for 4
centimeters o f display.
4. Terminate the TO RECORDER output with 60012 and
connect the test oscilloscope across the termination. The
signal amplitude should measure at least 60 millivolts.
VIDEO INPUT Check
1. Set the VERTICAL DISPLAY switch to the VIDEO input
position.
2. Set the Amplitude Calibrator switch o f the oscilloscope
to the .1 volt into 5012 position. If the oscilloscope does not
have this position use the .5 volt position.
3. Turn the G A IN control o f the Type 1 L I0 fu lly clockwise.
4. Connect between the VIDEO INPUT connector o f the
Type 1 LI 0 and the CAL OUT connector o f the oscilloscope.
5. Set the sweep rate o f the oscilloscope to .5 mSEC/CM
and set the triggering controls for a stable display.
6. Check for approximately 1 cm o f vertical deflection
on the screen of the oscilloscope. This check is mainly for
continuity rather than a deflection factor check. The deflec­
tion factor is controlled by the oscilloscope.
CALIBRATION PROCEDURE
Do not calibrate the Type 1 LI0 unless the need is indicated
in the Checkout Procedure. Once the need for calibration
is indicated, perform only the calibration steps that are
recommended in the Checkout Procedure.
Calibration Equipment Required
1. Items 1 through 7 under “ Equipment Required” in the
Checkout Procedure of this section.
2. Test Oscilloscope: Tektronix Type 530 or 540-Series
recommended with a Type H or K plug-in unit and a 10X
Probe.
3. Alignment tools:
D escription
Screwdriver
plastic shaft
Rod for 0.100” inside
diameter hex slugs
Handle and insert for
V a " inside diameter
hex slugs
T e ktro n ix
Part N um ber
003-0000-00
003-0301-00
003-0307-00
003-0310-00
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4 -8