![Tektronix 1L30 Скачать руководство пользователя страница 62](http://html1.mh-extra.com/html/tektronix/1l30/1l30_instruction-manual_1077897062.webp)
Calibration— Type 1L30
CALIBRATION RECORD A N D INDEX
This abridged Calibration Procedure provides a record
of the instrument's performance. It also serves as a ready
index to specific calibration steps.
An experienced cali
brator may use this as a calibration guide, referring to the
detailed procedure only when necessary. The listed char
acteristics are the same as the requirements listed in the
complete procedure:
Type 1L30, Serial No.
Calibration Date ____
0
6. Adjust kH z/C M Dispersion
Page 6-13
□
Apply 10 ns and I j i s marker from the Time-Mark
Generator to the RF INPUT connector. Set the DIS
PERSION to 500 kHz/cm.
Preset the DISPERSION
BAL to its centered position. Adjust C384 and C385
simultaneously in opposite directions for 1 marker/
2 centimeters. Adjust kHz/cm Cal R368, for optimum
dispersion linearity.
7. Check Dispersion Accuracy for kH z/C M
Page 6-14
Range
ft
Calibrator
I"!
1. Adjust Center Frequency
Page 6-7
Apply a 200 M Hz signal to the RF INPUT connector
and adjust the G A IN for a 5 cm signal amplitude.
Set the DISPERSION RANGE to M H z /C M position.
Adjust the Center Freq Cal R253, for minimum signal
shift as the DISPERSION selector is switched through
the M H z /C M range. Adjust the Sweep Center R204
to position the 200 M Hz IF feedthrough signal to the
display center.
□
2. Adjust Frequency Dispersion and Linearity Page 6-8
Apply 10 ns and .1 p.% markers from the Time-Mark
Generator to the RF INPUT connector. Adjust the
Disp Cal R208 for dispersion accuracy and C358 for
dispersion linearity with the Type 1L30 Dispersion
set to 10 M H z/C M .
□
3. Check Dispersion Accuracy of M H z /C M
Page 6-9
Ranges and IF CENTER FREQ controls
Check the dispersion accuracy for each M H z /C M
position of the DISPERSION selector as listed in
Table 6-1.
Check the range, dispersion accuracy
and linearity through the frequency range of the
IF CENTER FREQ controls.
□
4. Adjust IF Amplifier Response
Page 6-10
Apply a 200 M Hz signal to the RF INPUT connector.
Adjust L144, T464, T454, C435 and C425 in the order
listed for maximum signal response.
Adjust L444
midway between the 70 M Hz oscillator dropout
points.
Check dispersion accuracy through the - f and —
2.5 M Hz range of the IF CENTER FREQUENCY at
each DISPERSION selector position listed in Table
6-2. Accuracy must remain within ± 3 % over the
center 8 divisions of the graticule.
□
8. Adjust Avalanche Voltage and Internal
Page 6-15
1 M Hz Reference Oscillator
Set the INT 1 M Hz REF FREQ selector to the EXT REF
FREQ position, push the LOCK CHECK button and
adjust the Avalanche Volts R831 to a position approx
imately y8 turn back from the free-running avalanche
position. Adjust L804 so the oscillator starts with
minimum delay when the INT REF FREQ switch is
switched from the EXT REF FREQ position to the INT
REF FREQ position. Check for phase lock beat signals
through the frequency range of the RF CENTER FRE
QUENCY. Check for proper operation with an exter
nal reference signal applied.
0
9. Check Accuracy of IF ATTEN dB Selectors Page 6-1/
Apply a signal through calibrated attenuators and
within the frequency range of the instrument to the
RF INPUT connector. Check the accuracy of each
IF ATTEN dB selector. See Table 6-3. Accuracy
must equal or exceed 0.1 dB/dB of attenuation.
0 10. Check Dynamic Range of Vertical Display Page 6-18
Modes
Dynamic range of the 6 cm screen is as follows: LIN
> 26 dB, LOG > 40 dB and SQ LAW > 13 dB.
K
%
jf
*
i
&
3*
0 5.
Adjust Resolution Bandwidth
__
Page 6-10
j—j
Connect the test oscilloscope probe to pin B of the
honeycomb assembly.
Adjust C504 and C508 for
optimum display symmetry, on the test oscilloscope.
Adjust the bandpass of the 5 M Hz filter by adjusting
Resol Cal R543, C610, C620 and L624 for optimum
symmetry and correct bandpass of the display on the
0
plug-in
oscilloscope.
Resolution
bandwidth
must
equal or exceed 100 kHz, at the — 6dB point, with,
the RESOLUTION control fully clockwise and must
decrease for each switch position counterclockwise
until the bandwidth is equal to or less than 1 kHz
with the RESOLUTION control in the fully counter
clockwise position.
11. Check Attenuation Range of IF G A IN
Control
Range of the IF G A IN control must equal or exceed
|
I
12. Check Signal Amplitude at RECORDER
Output Jack
!?
W ith the VERTICAL DISPLAY selector in the LIN
position, the signal amplitude to the RECORDER
connector when terminated into a 600 fi load should
equal or exceed 2 mV/cm of displayed signal ampli-
tude.
ft
©
6 -5
Содержание 1L30
Страница 48: ...si L i y n Maintenance Type 1L30 Fig 4 15 Honeycomb assembly drcui a n d component layout 4 n ...
Страница 59: ...Fig 6 1 A Test equipment required for calibration ...
Страница 60: ... Calibration Type 1130 ...
Страница 120: ...T Y P E I L 3 0 S P E C T R U M A N A L Y Z E R ib i IF SYSTEM BLOCK DIAGRAM 9 1 9 2 ...
Страница 127: ......