TB 9-6625-2212-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Calibration Fixture (Notch Filter), Tektronix, Type 067-0938-00. 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. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
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
Attenuator
Range:
-60 dB
Accuracy: 0.25 dB
Notch depth
Accuracy: At least -60 dB (after nulling)
Accuracy: 2% of indicated frequency with nulling adjustment
Notch frequency
controls centered
20 Hz to 100 kHz notch frequency:1
Harmonic loss
At 2X center frequency 9.5 dB 0.5 dB
At 3X center frequency 6.0 dB 0.5 dB
At 4X center frequency 4.5 dB 0.5 dB
At 5X center frequency 3.5 dB 0.5 dB
50 kHz notch frequency: add 0.5 dB to above values
100 kHz notch frequency: add 1.0 dB to above values
loss figures are approximate. Actual loss is determined and recorded on test report provided in this TB.
EQUIPMENT REQUIREMENTS
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 item selected must be verified to perform satisfactorily
prior to use and must bear evidence of current calibration. The equipment must meet or
provide a four-to-one ratio between the standard and TI. Where a four-to-one ratio cannot
be met, the actual accuracy of the equipment selected is shown in parenthesis.