Advertisement
Quick Links
AND DELAY LINE OF A 540-SERIES OSCILLOSCOPE
The delay line and vertical amplifier should not require frequent readjust
ment.
These adjustments require adequate equipment and appreciable care.
justments are best effected by persons who have had Tektronix factory training in
this work.
You should not undertake such adjustments unless there is a definite
need for them as indicated by tests indicated below.
The standard procedure for adjusting the transient response of the vertical-
deflection system, including the plug-in preamplifier, includes two principal oper
ations.
These are
1.
Testing the vertical-deflection system of the oscilloscope itself, excluding
the plug-in preamplifier, by means of the Type 53/5^P Plug-In Test Unit, and
making any needed adjustments.
the present publication.
2.
And testing the response of the plug-in preamplifier, inserted in a properly
adjusted 5^0-Series oscilloscope, by means of the Type 107 Square-Wave Gen
erator, and making any needed adjustments.
in separate publications covering various types of plug-in preamplifiers.
If you have more than one plug-in preamplifier or 5^0-Series oscilloscope,
and if you carry out the two operations listed above on all your 5^0-Series oscil
loscopes and all your plug-in preamplifiers, you will then be able to use any of
your plug-in preamplifiers with any of the oscilloscopes and still
transient response with any preamplifier-oscilloscope combination.
You will need the following equipment when you follow the standard procedure
in checking the vertical amplifier and delay line in the oscilloscope itself.
1.
Instruction Manual for your oscilloscope.
2.
Tektronix Type 5 ^ / 5 ^ Plug-In Test Unit with Instruction Manual.
3.
53/5^-Series or 53-Series plug-in preamplifier of any type.
k.
Dc voltmeter or vacuum-tube voltmeter (at least 20,000 ohms per volt), cali
brated for an accuracy of
volts.
(Few portable voltmeters have comparable accuracy, particularly after
a period of use.
5.
Tektronix Type EP53A Gain Set Adapter.
6.
Tektronix No. 003-007 Alignment Tool (see Fig. 1).
Tektronix, Inc., P. 0. Box 831, Portland 7, Oregon
HOW TO ADJUST THE VERTICAL AMPLIFIER
NOTICE
GENERAL PROCEDURE
AND
REQUIRED EQUIPMENT
These tests and adjustments are described in
1% at 13 volts, and for an accuracy of 2% at 1350
Be sure your voltmeter is accurate.)
Preliminary manuscript copy
These adjustments are described
R E C E IV E D
N. J. OFFICE
FEKTRCNIX, IN C .
The ad
get optimum
1-58
Advertisement
Related Manuals for Tektronix 540 Series
Summary of Contents for Tektronix 540 Series
- Page 1 These adjustments require adequate equipment and appreciable care. The ad justments are best effected by persons who have had Tektronix factory training in this work. You should not undertake such adjustments unless there is a definite need for them as indicated by tests indicated below.
- Page 2 6 inches long (see Fig. 1). Test lead about 18 inches long, fitted with a banana plug at each end (such as Tektronix No. 012-013). PRELIMINARY CHECKS AND ADJUSTMENTS How to display the output waveform of the Type 53/5^P Insert the 9fype 53/5^P Plug-In Test Unit into the oscilloscope.
- Page 3 Set the controls as follows: POWER INTERNAL SWEEP (Type 5kl) HORIZONTAL DISPLAY or MAIN SWEEP NORMAL (Type 5^5) Main Sweep controls: -HINT. TRIGGER SLOPE AC FAST TRIGGERING MODE full right or full left TRIGGERING LEVEL PRESET* STABILITY .1 MICROSEC t i m b MULTIPLIER Plug-in unit controls: COIL CURRENT...
- Page 4 check the transient response of the vertical-deflection system," in order to familiarize yourself with the general nature and scope of the adjustments that may be required. I.L i I -4-4- 4 - 4 - — L-i— "" " M i l ' 1 1 \ t 1"...
- Page 5 V1025 and/or V1040 in Type 541 Oscilloscopes having serial numbers lower than 64-75 in Type 54-5 Oscilloscopes having serial numbers lower than 9292. V1014 and/or V1024 in Type 541 Oscilloscopes having serial numbers 6475 or higher, or in Type 545 Oscilloscopes having serial numbers 9292 or higher.
- Page 6 toward the right, change V1C0A and/or V1024 so that the waves have flat tops. Now remove the Type 53/5^?, the Type EP53-& and the test lead. Reinsert the Type 53/5^P with its interconnecting plug directly inserted in the Fig. Illustrating sloping characteristic in the waveform caused by defective VICGA and/or V102^+ (or V1025 and/or VIO^O in older oscilloscopes).
- Page 7 on "Detailed adjustment of the vertical amplifier and delay line." NOTE: Do not confuse the above case of severe wrinkles in the display with the normal slight termination bump discussed next. Fig. 5« Illustrating a "rising" general "level" of early part of waveform.
- Page 8 There will often be a slight wrinkle called a "termination bump" in the dis played waveform, located about Z/z centimeters to the right of the corner of the waveform (see Fig. 2). Does the termination bump appreciably exceed about 2 tracewidths in amplitude (as in Fig. 8)? Or are there perhaps two or three other small bumps along the flat top of the waveform as shown in Fig.
- Page 9 following adjustments as necessary to reduce the bump(s), using the No 003-007 tool: in Type 541 Oscilloscopes having serial C1073, C1075, C1076, C1077, c m 3 , cio84, C 1 0 9 3 , CI 1 0 3 , numbers lower than 6475* or C1123, C1133, and the 5 or 6 delay-line capacitors nearest in Type 545 Oscilloscopes having serial...
- Page 10 As a result of the above adjustments, a region of the flat-top part of the waveform just to the right of the corner, will probably be a little higher or lower than the rest of the wave top (Fig. Carefully readjust the delay-line capacitors nearest the cathode-ray tube to bring this part of the waveform to the same "level"...
- Page 11 Fig. 9. The part of the waveform near the corner has been raised as a result of adjustments to re duce an originally excessive termination bump. Al corner may be low ternatively, the region near the ered, rather than raised. Fig.
- Page 12 V/hen the adjustments are completed, the corner and the leading edge of the displayed waveform should look like those of Fig. 2. DETAILED ADJUSTMENT OF THE VERTICAL AMPLIFIER AND DELAY LINE You should not undertake the detailed adjustment of the vertical amplifier and delay line unless the checks previously described have shown the detailed ad...
- Page 13 lent response inherent in the oscilloscope. To determine the deflection factor of the cathode-ray tube, you will have to measure the voltage dif ference necessary, at the vertical-deflection plates, to move the beam from the top to the bottom line of the graticule. Do this as follows: Place the Type 53/5^P Plug-In Unit in the oscilloscope.
- Page 14 reduce the vertical-deflection factor of the cathode-ray tube. Decreasing the resistance of R 863 or increasing the resistance of R864 will increase the vertical-deflection factor. The vertical-shield voltage at the junction of R 863 and R864 must measure between 2o0 and 265 volts after you have made any necessary changes in either of these resistors.
- Page 15 0 .9 to 1 .6 volts. In oscilloscopes covered by the left-hand column above, you can Usually get best results by using Tektronix tested tubes (6CB6, Tektronix No. 157-057). In Type 541 Oscilloscopes having serial numbers lower than 6475, or in Type...
- Page 16 Type 545 Oscilloscopes having serial numbers below 9292; or replace V1014 or V1024 in Type 541 Oscilloscopes having serial numbers 6475 or higher or in Type 545 Oscilloscopes having serial numbers 9292 or higher. How to readjust the graticule cam Now readjust the graticule cam if necessary so that the trace is fully visible when positioned both to the top and to the bottom graticule lines by means of the VERTICAL POSITION control.
- Page 17 How to test the oscilloscope vertical-deflection system for microphonics Remove the plug-in preamplifier and replace it with the Type 53/54P. Operate the oscilloscope with a free-running trace and with the COIL CURRENT turned off in the Type 53/54P. Operate the Main Sweep MULTIPLIER switch rather rapidly through out its range, and note whether the resulting mechanical vibration causes any "ringing"...
- Page 18 1 8 - sticks unduly, you can initially use a metal 5/6^" alien wrench to free it— again being careful to engage the wrench completely with the slug before turning it. In Type Oscilloscopes having serial numbers lower than 6^75 or in Type 1125b and 11255 5^5 Oscilloscopes having serial numbers lower than 9292, preset so that the slugs are barely outside the coils (toward the outer part of the oscil...
- Page 19 kept in mind: (l) to reduce the wrinkles in the top of the display to a minimum— not more than about 1 tracewidth in amplitude, and (2) to make the part of the display that is affected by the delay line flat and consistent in ’...