Tektronix TAS 200 User manual

Instructions Manual
TAS 200 Series
Oscilloscopes
070-9855-01
www.tektronix.com

Bench Test Instruments and Handheld Oscilloscopes Basic Service i
Table of Contents
TAS 200 Series Oscilloscopes 1................................
TAS 200 Series Specifications 3................................
TAS 200 Series Performance Verification 7......................
Test Equipment 8..................................................
Set Up 9.........................................................
Vertical Check 10..................................................
Horizontal Check 15................................................
Trigger Check 17...................................................
Cursor Check 19...................................................
TAS 200 Series Adjustment Procedures 21.......................
List of Adjustments 21..............................................
Test Equipment 23..................................................
Preparation for Adjustment 24........................................
Power Supply Adjustments 27........................................
Vertical Adjustments 30.............................................
Horizontal Adjustments 37...........................................
Trigger Adjustments 40..............................................
Probe Compensation 42..............................................
Cursors and Readout Adjustments 43...................................

Table of Contents
ii Bench Test Instruments and Handheld Oscilloscopes Basic Service

Bench Test Instruments and Handheld Oscilloscopes Basic Service 1
TAS 200 Series Oscilloscopes
The Tektronix TAS 220 and TAS 250 oscilloscopes are dual-channel products
withfrequencybandwidthsofDCto20MHzandDCto50MHzrespectively.
Both oscilloscopes feature a maximum sensitivity of 1 mV/division and a
maximum sweep speed of 10 ns/division.
In addition, the TAS 200 series oscilloscopes offer the following features:
HHigh beam transmission and high intensity CRT displays for clear
waveforms at high sweep speeds.
HHigh stability low-drift temperature compensation circuits to reduce baseline
and DC balance drift.
HTrigger feature, Set to 50% that eliminates triggering adjustments when
displaying regular, video, and large duty-cycle-ratio signals.
HSynchronization separator and trigger circuitry that permits the display of
TV signals. (You can automatically select vertical and horizontal signals
with the SEC/DIV control.)
HAutomatic focus (following an initial intensity adjustment).
Figure 1: TAS 220 oscilloscope

TAS 200 Series Oscilloscopes
2Bench Test Instruments and Handheld Oscilloscopes Basic Service

Bench Test Instruments and Handheld Oscilloscopes Basic Service 3
TAS 200 Series Specifications
The characteristics listed in this section apply under the following conditions:
HThe instrument operates in a 0°to 40°C ambient environment unless
otherwise noted.
HThe instrument warms up for at least 20 minutes.
HThe instrument is adjusted at an ambient temperature between
20°and 30°C.
NOTE. All specifications are warranted unless marked “typical.” Typical
characteristics are not guaranteed but are provided for the convenience of the
user.
NOTE. Input limits apply to signals with frequencies less than 1 kHz.
Table 1: Vertical deflection characteristics
Characteristic TAS 220 description TAS 250 description
Frequency Bandwidth (--3 dB) DC to 20 MHz
(5 mV/div to 5 V/div at 5°to 35°C)
DC to 50 MHz
(at 0°to 10°C and 35 to 40°C)
DC to 15 MHz DC to 40 MHz
(at 0°to 5°C and 35°to 40°C)
DC to 10 MHz
(1mV/div to 2 mV/div)
DC to 15 MHz
Vertical Gain (15°to 35°C) 5mV/divto5V/div: ±3%
1mV/divto2mV/div: ±5%
Variable Gain (Typical) To 1/2.5 or less of the readout indicated value.
Common Mode Rejection Ratio (Typical) 50 kHz: >50:1
10 MHz: >10:1
Input Impedance (Typical) 1MΩ,30pF
Vertical Linearity (Typical) ±0.1 division or less of amplitude change when a waveform of two divisions at
graticule center is moved vertically.
DC Balance Shift (Typical) 5mV/divto5V/div: ±0.5 divisions
1mV/divto2mV/div: ±2.0 divisions

TAS 200 Series Specifications
4Bench Test Instruments and Handheld Oscilloscopes Basic Service
Table 1: Vertical deflection characteristics (cont.)
Characteristic TAS 250 descriptionTAS 220 description
Chopping Repetition Frequency (Typical) 250 kHz
Maximum Input Voltage 400 V (DC + peak AC)
Channel Isolation (Typical) 50 kHz: 1000:1
10 MHz: 100:1
20 MHz: 30:1 50 MHz: 30:1
CH 1 Signal Output (Typical) 100 mV/div open circuit
50 mV/div into 50 Ω
CH 2 INV Balance (Typical) ≤1 division balanced point variation
Table 2: Horizontal characteristics TAS 200 series
Characteristic Description
Standard Sweep Time Accuracy 15°to 35°C: ±3%
0°to 15°C and 35°to 40°C: ±4%
Magnified Sweep Time Accuracy 1s/div to 0.5 sec/div: ±5%
0.1to0.5s/div: ±8%
Sweep Linearity
Standard ±3%
X10 MAG ±5%
X10 MAG 0.1to0.5s/div: ±8%
Table 3: Readout characteristics TAS 200 series
Characteristic Description
Readout Resolution 1/25 div
Readout Accuracy ±3% + 1/25 div
Readout Modes ∆V, ∆T, 1/∆T

TAS 200 Series Specifications
Bench Test Instruments and Handheld Oscilloscopes Basic Service 5
Table 4: Trigger characteristics
Characteristic TAS 220 description TAS 250 performance description
Sensitivity
0.5 divisions (internal), 0.1 V (external) DC to 5 MHz DC to 10 MHz
1.5 divisions (internal), 0.2 V (external) 5to20MHz 10 to 50 MHz
2.0 divisions (internal), 0.2 V (external) Video Video
Input Impedance (Typical) 1MΩ,30pF
Maximum Input Signal 100 V (DC + peak AC)
Table 5: Typical Z-Axis characteristics TAS 200 series
Characteristic Description
Maximum Input Voltage 50 V (DC + peak AC)
Sensitivity 3V
p-p (Trace becomes brighter with negative input.)
Frequency Bandwidth DC to 5 MHz
Input Resistance 5kΩ
Table 6: Typical X-Y mode operation
Characteristic TAS 220 description TAS 250 description
Sensitivity Same as CH 1 vertical axis
Sensitivity Accuracy 5mVto5V/div: ±4%
1to2mV/div: ±6%
Frequency Bandwidth DC to 1 MHz DC to 2 MHz
X-Y Phase Difference ≤3°from DC to 50 kHz ≤3°from DC to 100 kHz
EXT HOR Sensitivity 0.1 V/div
Table 7: Typical probe compensation signal characteristics TAS 200 series
Characteristic Description
Waveform Positive going square wave
Frequency 1kHz
Duty Ratio 50:50
Output Level 2V
p-p
Output Resistance 2kΩ

TAS 200 Series Specifications
6Bench Test Instruments and Handheld Oscilloscopes Basic Service
Table 8: Environmental characteristics
Characteristic Description
Temperature
Operating 0°to 40°C
Nonoperating -- 4 0 °to +70°C
Tested to MIL-T-28800D, paragraphs 4.5.5.1.3 and 4.5.5.1.4, except in 4.5.5.1.3 steps
4and5(0°C operating test) are performed ahead of step 2 (--40°C nonoperating
test). Equipment shall remain off upon return to room ambient during step 6.
Excessive condensation shall be removed before operating during step 7.
Altitude
Operating ≤4,570 meters (15,000 feet). Maximum operating temperature decreases 1°C per
300 m (1,000 feet) above 1,500 m (5,000 feet).
Nonoperating ≤15,250 meters (50,000 feet)
Relative Humidity
Operating 30°to 40°C, 90% relative humidity +0%, --5%
Nonoperating 30°to 60°C, 90% relative humidity +0%, --5%
Five cycles (120 hours) referenced to MIL-T-28800D paragraph 4.5.1.2.2 for type III,
class 5 instruments. Operating and nonoperating at 90%, +0%, --5% relative humidity.
Vibration (Operating) 15 minutes along each of three major axes at a total displacement of 0.015 inch
peak-to-peak (2.4 g at 55 Hz) with frequency varied from 10 Hz to 55 Hz to 10 Hz in
one minute sweeps. Hold for 10 minutes at 55 Hz in each of three major axes. All
major resonances must be above 55 Hz.
Shock (Operating and Nonoperating) 30 g, half-sine, 11 ms duration, three shocks per axis each direction, for a total of 18
shocks.
Radiated and Conducted Emissions Meets EN55011, class A.
Safety Listed CSA C22.2 No. 231 and UL1244
Table 9: Typical mechanical characteristics TAS 200 series
Characteristic Description
Dimensions 32.7 cm ×16.2 cm ×46.3 cm (12.9 inch ×6.38 inch ×18.2 inch)
Weight 7.0 kg (15.4 lbs)
Operating Voltages 100 V, 120 V, 220 V, 240 V,
10% variation from selector range permitted.
Line Frequency 50 or 60 Hz
Power Consumption 70 VA

Bench Test Instruments and Handheld Oscilloscopes Basic Service 7
TAS 200 Series Performance Verification
This section contains procedures to verify that the TAS 220 and TAS 250
oscilloscopes perform as warranted. Verify instrument performance whenever the
accuracy or function of your instrument is in question. The procedures are
organized into four sections: Vertical Check, Horizontal Check, Trigger Check,
and Cursor Check.
The performance verification procedures provide a valid confirmation of
instrument electrical characteristics and function under the following conditions:
HThe instrument operates in a 20_to 30_C ambient environment.
HThe oscilloscope warms up for at least 20 minutes.
HThe cabinet remains installed on the oscilloscope.
The performance verification procedure should be performed annually or after
every 2000 hours of operation if used infrequently.
Table 11 lists the equipment needed to do the performance verification proce-
dures.
The TAS 200 series performance verification consists of the checks listed in
Table 10.
Table 10: Performance verification checks
Vertical Check
DC Gain Accuracy
DC Coupled Bandwidth
DC Balance
Variable DC Balance
CH 2 Inverted Balance
Horizontal Check
Time Base Accuracy
Trigger Check (Trigger Sensitivity)
Cursor Check
∆T Measurement Accuracy
∆V Measurement Accuracy

TAS 200 Series Performance Verification
8Bench Test Instruments and Handheld Oscilloscopes Basic Service
Test Equipment
The performance verification procedures use external traceable test equipment to
directly check warranted characteristics.
Alternative test equipment must meet or exceed the intended minimum
requirements. If you substitute equipment, you may need to modify the
performance verification procedures.
NOTE. Before beginning the performance verification procedures, warm up the
test equipment according to the manufacturer’s recommendations.
Table 11: Performance verification test equipment
Description Minimum requirements Example product
Leveled Sine Wave Generator 200 kHz to 250 MHz; variable amplitude
from5mVto4V
p-p into 50 Ω
Wavetek 9100 Universal Calibration
System with Oscilloscope Calibration
M
d
l
(
O
i
)
Time Mark Generator Variable marker frequency from 10 ms to
10 ns; accuracy within 2 ppm
y
p
Module (Option 250)
Fluke 5500
A
Multi-produ
c
tC
a
libr
a
tor with
DC Calibration Generator DC voltage levels from 100 mV to 10 V
F
l
u
k
e
5
5
0
0
A
M
u
l
t
i
p
r
o
d
u
c
t
C
a
l
i
b
r
a
t
o
r
w
i
t
h
Oscilloscope Calibration Option 5500A-SC
Digital Multimeter 35 V, 4 A, ±0.1% Accuracy Tektronix DMM914 Digital Multimeter
Termination (two required) 50 Ω, female BNC input, male BNC output Tektronix 011-0049-01
Cable, Coaxial 75 Ω, male-to-male BNC connectors,
36 inch length
Tektronix 012-1338-00
Cable, Precision Coaxial 50 Ω, male-to-male BNC connectors,
36 inch length
Tektronix 012-0482-00

TAS 200 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 9
Set Up
Following a 20 minute warm-up period, preset the oscilloscope to the settings
listed below.
Table 12: Oscilloscope initial settings
Control Setting
INTENSITY Visible Display
CURSOR ON/OFF Off
VERTICAL
POSITION Midrange
MODE CH1
VOLTS/DIV 10 mV
VARIABLE CAL
GND In
HORIZONTAL
SEC/DIV 10 ms
POSITION Midrange
MAG Off (Out)
X-Y Off (Out)
SWEEP VARIABLE CAL
TRIGGER
SLOPE Positive (push switch out)
LEVEL Midrange
MODE AUTO
SOURCE CH 1
COUPLING DC

TAS 200 Series Performance Verification
10 Bench Test Instruments and Handheld Oscilloscopes Basic Service
Vertical Check
The following checks verify the vertical accuracy of your oscilloscope.
To check DC gain accuracy, perform the following steps.
1. Use the 50 Ωprecision coaxial cable to connect the standard amplitude
output of the DC calibration generator to the TAS 200 series oscilloscope
CH 1 (CH 2) input. See Figure 2 below.
Calibration
generator
Precision cable
Figure 2: Gain and voltage check setup
2. Set up the oscilloscope as follows:
VERTICAL MODE CH1 (CH2)
CH 1 (CH 2) AC-DC DC
CH 1 (CH 2) VOLTS/DIV 1 mV
TRIGGER MODE AUTO
HORIZONTAL SEC/DIV 0.5 ms
CH 1 (CH 2) GND Out (release)
3. Set the oscilloscope CH 1 VOLTS/DIV Scale and calibration generator
output to each of the values listed in Table 13; then verify that the readings
on the oscilloscope remain within the limits of the Displayed Signal
Accuracy.
DC Gain Accuracy

TAS 200 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 11
Table 13: DC gain and displayed signal accuracy
TAS 200 volts/div scale Generator output Displayed signal accuracy
1mV 5mV 4.75 to 5.25 div
2mV 10 mV 4.75 to 5.25 div
5mV 20 mV 3.88 to 4.12 div
10 mV 50 mV 4.85 to 5.15 div
20 mV 0.1 V 4.85 to 5.15 div
50 mV 0.2 V 3.88 to 4.12 div
100 mV 0.5 V 4.85 to 5.15 div
200 mV 1V 4.85 to 5.15 div
500 mV 2V 3.88 to 4.12 div
1V 5V 4.85 to 5.15 div
2V 10 V 4.85 to 5.15 div
5V 20 V 3.88 to 4.12 div
4. Set the calibration generator output to 5 mV.
5. Return the oscilloscope CH 1 (CH 2) VOLTS/DIV control to 1 mV.
6. Rotate the oscilloscope CH 1 (CH 2) VERTICAL VARIABLE control
counterclockwise off of the CAL position until the amplitude of the
displayed waveform is reduced to two divisions or less.
7. Set the oscilloscope CH 1 (CH 2) VERTICAL VARIABLE control to the
CAL position.
8. Disconnect the test setup from the oscilloscope.
9. Repeat steps 1 through 8 for CH 2.

TAS 200 Series Performance Verification
12 Bench Test Instruments and Handheld Oscilloscopes Basic Service
To check DC coupled bandwidth accuracy, perform the following steps.
1. Use the 50 Ωprecision coaxial cable to connect the output of the leveled
sine wave generator to the 50 Ωtermination; then connect the 50 Ω
termination to the TAS 200 series oscilloscope CH 1 (CH 2) input. See
Figure 3 below.
Leveled Sine
Wave Generator
Precision cable 50 ΩTermination
Figure 3: Bandwidth check setup
2. Set up the oscilloscope as follows:
VERTICAL MODE CH1 (CH2)
CH 1 (CH 2) AC-DC DC
CH 1 (CH 2) VOLTS/DIV 1 mV
HORIZONTAL SEC/DIV 10 s
TRIGGER MODE AUTO
TRIGGER COUPLING DC
TRIGGER SOURCE CH 1 (CH 2)
CH 1 (CH 2) GND Out (release)
3. To confirm the bandwidth of the input channel, perform the following
substeps (a. through c.) at the settings and limits noted in Table 14.
a. Set the oscilloscope CH 1 (CH 2) VOLTS/DIV control as indicated.
b. Set the leveled sine wave generator to the specified 50 kHz reference
amplitude.
c. Verify that the oscilloscope display amplitude remains greater than the
bandwidth minimum amplitude (minimum number of divisions), while
increasing the leveled sine wave generator frequency to the specified
value for the CH 1 (CH 2) VOLTS/DIV setting and oscilloscope model.
DC Coupled Bandwidth

TAS 200 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 13
NOTE. At lower VOLTS/DIV settings, you might need to set TRIGGER COU-
PLING to HF REJ to minimize noise or double triggering.
Table 14: DC coupled bandwidth
Volts/Div 50 kHz
reference amplitude
Bandwidth
minimum amplitude
TAS 220
bandwidth
TAS 250
bandwidth
1mV 6 divisions 4.2 divisions 10 MHz 15 MHz
2mV 6 divisions 4.2 divisions 10 MHz 15 MHz
5mV 6 divisions 4.2 divisions 20 MHz 50 MHz
10 mV 6 divisions 4.2 divisions 20 MHz 50 MHz
20 mV 6 divisions 4.2 divisions 20 MHz 50 MHz
50 mV 6 divisions 4.2 divisions 20 MHz 50 MHz
100 mV 6 divisions 4.2 divisions 20 MHz 50 MHz
200 mV 6 divisions 4.2 divisions 20 MHz 50 MHz
500 mV 6 divisions 4.2 divisions 20 MHz 50 MHz
1V 4 divisions 2.8 divisions 20 MHz 50 MHz
4. Repeat steps 1 through 3 for CH 2.
To check DC balance accuracy, perform the following steps.
1. Set up the oscilloscope as follows:
VERTICAL MODE CH1 (CH2)
CH 1 (CH 2) GND In
CH 1 (CH 2) VARIABLE CAL
2. Verify that the oscilloscope trace shift is less than ±0.5 divisions when
rotating the CH 1 (CH 2) VOLTS/DIV control between the 5 mV and 5 V
settings.
3. Verify that the oscilloscope trace shift is less than two divisions when the
CH 1 (CH 2) VOLTS/DIV control is changed from the 1 mV to the 2 mV
setting.
4. Repeat steps 1 through 3 above for CH 2.
DC Balance

TAS 200 Series Performance Verification
14 Bench Test Instruments and Handheld Oscilloscopes Basic Service
To check Variable DC balance accuracy, perform the following steps.
1. Set up the oscilloscope as follows:
VERTICAL MODE CH1 (CH2)
CH 1 (CH 2) AC-DC DC
CH 1 (CH 2) GND In
CH 1 (CH 2) VOLTS/DIV 10 mV
2. Verify that the oscilloscope trace shift is less than one division between the
fully clockwise and the fully counterclockwise positions of the CH 1
VARIABLE control.
3. Repeat steps 1 and 2 above for CH 2.
To check CH 2 Inverted balance accuracy, perform the following steps.
1. Set up the oscilloscope as follows:
VERTICAL MODE CH2
CH 2 GND In
2. Position the oscilloscope trace on the center horizontal graticule line using
the CH 2 POSITION control.
3. Verify that there is minimal trace shift (<±1 divisions) on the TAS 200 series
instrument when switching the CH 2 INVERT button in and out.
4. Set the oscilloscope CH 2 INVERT button to the out position.
Variable DC Balance
CH 2 Inverted Balance

TAS 200 Series Performance Verification
Bench Test Instruments and Handheld Oscilloscopes Basic Service 15
Horizontal Check
The following checks verify the horizontal accuracy of your oscilloscope.
To check time base accuracy, perform the following steps.
1. Use the 50 Ωprecision coaxial cable to connect the output of the time mark
generator to the 50 Ωtermination; then connect the 50 Ωtermination to the
TAS 200 series instrument CH 1 input. See Figure 4 below.
Time Mark
Generator
50 ΩTermination
Precision cable
Figure 4: Timing check setup
2. Set up the oscilloscope as follows:
VERTICAL MODE CH1
CH 1 AC-DC DC
CH 1 VOLTS/DIV 0.5 V
CH 1 GND Out (release)
HORIZONTAL SEC/DIV .1 s
TRIGGER MODE AUTO
TRIGGER COUPLING DC
3. Set up the time mark generator to produce 0.1 s markers.
4. Center the time marks vertically on the oscilloscope display.
5. Position the rising edge of the second time mark to the second vertical
graticule line of the oscilloscope display.
6. Verify that the time mark to graticule accuracy over the center eight divisions
is within the limits shown for each HORIZONTAL SEC/DIV setting listed
in Table 15.
Time Base Accuracy

TAS 200 Series Performance Verification
16 Bench Test Instruments and Handheld Oscilloscopes Basic Service
Table 15: Standard time base accuracies
HORIZONTAL
SEC/DIV
Time marker
setting
Time mark to graticule accuracy
over center 8 divisions
.1 s0.1 s±0.24 division
.2 s0.2 s±0.24 division
.5 s0.5 s±0.24 division
1s 1 s±0.24 division
2s 2 s±0.24 division
5s 5 s±0.24 division
10 s10 s±0.24 division
20 s20 s±0.24 division
50 s50 s±0.24 division
.1 ms 0.1 ms ±0.24 division
.2 ms 0.2 ms ±0.24 division
.5 ms 0.5 ms ±0.24 division
1ms 1ms ±0.24 division
2ms 2ms ±0.24 division
5ms 5ms ±0.24 division
7. Set the oscilloscope HORIZONTAL SEC/DIV control to either .5 s
(TAS 220) or .1 s (TAS 250).
8. Set the oscilloscope HORIZONTAL X10 MAG push switch to the on
position (in).
9. Set the time mark generator to 20 ns.
10. Position the edge of the second time mark to the second vertical graticule
line of the oscilloscope display.
11. Verify that the time mark to graticule accuracy over the center eight divisions
is within the limits shown for each HORIZONTAL SEC/DIV setting listed
in Table 16.