Tektronix TDS 420A, Service Manual, Page: 84 / 288

Performance Tests
4- 16
TDS 420A, TDS 430A & TDS 460A Service Manual
H
The digitizing oscilloscope must have been last adjusted at an ambient
temperature b20
_
C and +30
_
C, must have been operating for a
warm-up period of at least 20 minutes, and must be operating at an ambient
temperature between 5
_
C and +40
_
C. (The warm-up requirement is usually
met in the course of meeting the prerequisites listed above.)
Equipment Required
These procedures use external, traceable signal sources to directly check
warranted characteristics. The test equipment required is shown in Table 4--1.
Table 4- 1: Test Equipment
Item Number and
Description
Minimum Requirements Example Purpose
1. Attenuator,10X
(three required) Ratio: 10X; impedance 50
Ω
; connec-
tors: female BNC input, male BNC
output
Tektronix part number
011-0059-02 Signal Attenuation
2. Attenuator, 5X
(two required) Ratio: 5X; impedance 50
Ω
; connec-
tors: female BNC input, male BNC
output
Tektronix part number
011-0060-02 Signal Attenuation
3. Termination, 50
Ω
Impedance 50
Ω
; connectors: female
BNC input, male BNC output
Tektronix part number
011-0049-01 Checking delay match be-
tween channels
4. Termination, 75
Ω
Impedance 75
Ω
; connectors: female
BNC input, male BNC output
Tektronix part number
011-0102-01 Used to test Video Option 05
equipped oscilloscopes only
5. Cable, Precision Coaxial
(three required) 50
Ω
, 36 in, male to male BNC
connectors
Tektronix part number
012-0482-00 Signal Interconnection
6. Cable, Coaxial 75
Ω
, 36 in, male to male BNC
connectors
Tektronix part number
012-1338-00 Used to test Video Option 05
equipped oscilloscopes only
7. Connector, Dual-Banana
(two required) Female BNC to dual banana Tektronix part number
103-0090-00 Various Accuracy Tests
8. Connector, BNC “T” Male BNC to dual female BNC Tektronix part number
103-0030-00 Checking Trigger Sensitivity
9. Coupler, Dual-Input Female BNC to dual male BNC Tektronix part number
067-0525-02 Checking Delay Match Be-
tween Channels
10. Generator, DC Calibra-
tion
Variable amplitude to
±
110 V; accura-
cy to 0.1%
Wavetek 9100 (or, optionally,
Data Precision 8200, with
1 kV option installed) Checking DC Offset and
Measurement Accuracy
11. Generator, Sine Wave 100 kHz to at least 400 MHz. Variable
amplitude from 12 mV to 2 V
p-p
.
Frequency accuracy >2.0%
Rohde & Schwarz SMY
1
Checking Analog Bandwidth,
Trigger Sensitivity, Sample-
rate, External Clock, and
Delay-Time Accuracy
12. Meter, Level and Power
Sensor
Frequency range:10 MHz to 400MHz.
Amplitude range: 6 mVp-p to 2 V
p-p
Rohde & Schwarz URV 35,
with NRV-Z8 power sensor Checking Analog Bandwidth
and Trigger Sensitivity