TB 9-6625-2212-35
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.
Test instrument parameters
Performance specifications
Attenuator
Range: -60 dB
Accuracy: 0.25 dB
Notch depth
Accuracy: At least -60 dB (after nulling)
Notch frequency
Accuracy: 2% of indicated frequency with nulling adjustment
controls centered
20 Hz to 100 kHz notch frequency:1
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
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. 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 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 a four-to-one ratio cannot be met, the actual accuracy of the
equipment selected is shown in parenthesis.