TB 9-6625-2099-24
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CALIBRATION PROCESS FOR AM-6785/U
(TEKTRONIX, TYPE 7A26)
Preliminary instructions ......................................
Equipment setup...................................................
Vertical gain ..........................................................
Risetime .................................................................
Final procedure .....................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Dual Trace Amplifiers, AM-6880/U (Tektronix, Type 7A18), Tektronix, Types
7A18A, 7A18A w/Option 06, and AM-6785/U (Tektronix, Type 7A26). The manufacturers'
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. Variations among models are described in text.
b. Time and Technique. The time required for this calibration is approximately 1
hour, 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 adjustments.
Report only those adjustments made and designated with (R).
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument
parameters
Performance specifications
AM-6880/U (Tektronix, Type 7A18), Tektronix, Types 7A18A, and 7A18A w/Option 06
Vertical gain
Range: 5 mV/div to 5 V/div
Accuracy: 2% with gain adjusted at 10 mV/div
Risetime
Accuracy: 7900 series, 4.7 ns (75 MHz)
7800 series, 4.7 ns (75 MHz)
7700 series, 4.7 ns (75 MHz)
7600 series, 5.0 ns (70 MHz)
7500 series, 5.8 ns (60 MHz)
7400 series, 7.0 ns (50 MHz)
