TB 9-6625-1963-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Universal Counter/Timer, Tektronix Model 7D15. The manufacturer's
instruction 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 3
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 specifications which
pertain to this calibration are listed in table 1.
Test instrument
parameters
Performance specifications
Time base
Stability: 1 part in 107/mo1
Trigger amplifier
Proper response of trigger amplifier to square wave input
compensation
Input
Proper response of input attenuator to square wave
compensation
Input sensitivity
Channel A: 100 mV p-p, dc to 100 MHz
Channel B: 100 mV p-p, dc to 225 MHz
1
Verified over 4 hour period as function of time base accuracy ( 0.5 p/m).
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment to be used in this
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-286, AN/GSM-287, or AN/GSM-705. Alternate items may be used
by the calibrating activity. The items selected must be verified to perform satisfactorily
prior to use and must bear evidence of current calibration. The equipment must meet or
exceed the minimum use specifications listed in table 2. The accuracies listed in table 2
provide a four-to-one ratio between the standard and TI. Where the four-to-one ratio
cannot be met, the actual accuracy of the equipment selected is shown in parenthesis.