Instruction manual

Checks and Adjustments
5-4
1720/1721
14. Dual Input Coupler
Matched BNC cable-T for making phase comparisons between two inputs.
Matched length of the two arms within ±0.1 inch.
For example: Tektronix Part No. 067--0525--02.
15. Precision 50Ω Coaxial Cable
Tektronix Part No. 012--0482--00 (used with the TEKTRONIX SG503).
16. 50Ω to 75Ω Minimum Loss Attenuator
Tektronix Part No. 011--0057--00.
17. F emale to Female BNC adapter
Tektronix Part No. 103--0028--00
18. XY Input Connector Parade Display Test Connector
Fifteen-pin, subminiature D-type connector (for example: Tektronix Part
No. 131--0459--00), modified to input signals for XY checks and adjust-
ments. See Figure 5-1.
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9101112131415
Soldered-in wires need to be long
enough to permit shorting together.
+Y
INPUT
+Y HIGH
GAIN
INPUT
-- X
INPUT
+X
INPUT
--Y INPUT
+X HIGH
GAIN
INPUT
-- Y
INPUT
-- X
INPUT
Figure 5-1: Rear view of XY INPUT plug connections. Note that High Gain inputs are
shown even though they are not norm ally used in these procedures.