TB 9-6625-2056-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Time Base, Tektronix Type 7B80. The manufacturer's manual was used as
the prime data source in compiling these instructions. The equipment being calibrated will
be referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 2
hours, using the dc and low frequency technique.
2. Forms, Records, and Reports
a. Forms, records and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. Adjustments to be reported are designated (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).
3. Calibration Description. TI parameters and performance applications which pertain
to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Dc and slope balance
Range: Triggered with 0.3 division signal amplitude
Accuracy: Operationally checked for stable display
Sweep calibration
Range: 5 s to 10 ns in 27 steps. X10 magnifier extends
fastest calibrated sweep to 1 ns/div. Variable uncalibrated
sweep rate capability to at least 2.5 times the sweep rate
setting.
Accuracy: (Over center 8 divisions)
Range
UNMAG
MAG
5 to 1 s/div
4%
5%
0.5 s/div to 0.1 s/div
1.5%
2.5%
1
50 to 10 ns/div
2.5%
4%
Sweep length (UNMAG)
Range: All sweep ranges
Accuracy: At least 10.2 div
MAG registration
0.5 divisions or less from graticule center when changing from
MAG X10 to MAG X1
Position ranges:
POSITION controls fully cw
Start of sweep must be to right of graticule center at 1 ms/div.
POSITION controls fully ccw
Start of sweep must be to left of graticule center at 1 ms/div.
1Due
to bandwidth limitations of vertical amplifier magnified 10, 20, and 50 ns are not calibrated.
