TB 9-6625-2240-35
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
calibration of Oscilloscope, OS261U (Tektronix, Type 475), OS261A(V)1U (Tektronix, Type
475 Option 7), OS261B(V)1U (Tektronix, Type 475 Option 4), OS261C(V)1U (Tektronix,
Type 475 Option 4/7) and Tektronix, Type 475A (Tektronix, Type R475A). The
manufacturer's manuals were used as the prime data sources in compiling these
instructions. The equipment being calibrated will be referred to as the TI (test instrument)
throughout this bulletin.
a. Model Variations. Model variations are identified in the text.
b. Time and Technique. The time required for this calibration is approximately 4
hours, using the dc and low technique.
prescribed by TB 750-25.
b. Adjustments to be reported are determined (R) at the end of the sentence in which
they appear. When adjustments are in tables the (R) follows the designated adjustment.
Report only those adjustments made and designated with (R).
pertain to this calibration are listed in table 1.
Test instrument
parameters
Performance specifications
Vertical deflection
Range: 2 mV/div to 5 V/div in 11 steps (5 mV/div to 10 V/div for Tektronix, Type 475A)
Accuracy: 3% with gain set at 5 mV/div
Time and linearity
0.5 s/div to 0.01 s/div in 24 steps
Range: Unmag:
A sweep or B
Mag:
0.5 s/div to 1 ns/div in 24 steps
DLY'D sweep
Accuracy: 5 ms/div to 0.01 s/div
1%
Unmag:
2% 0.5 s/div to 10 ms/div
Mag:
2%
Unmag:
3%
Mag:
A delaying sweep
(A intensified
Range: 0.5 s/div to 0.05 s/div in 22 steps
sweep)
Accuracy: Unmag: 2%
3%
Mag:
