TB 9-6625-003-35
Test Instrument
Performance Specification
Parameters
Model 415A
Range: 70 dB, input attenuator provides 60 dB in 10 dB steps
0.1 dB per step
Accuracy:
Model 415B and 415BR
Range: 70 dB, input attenuator provides 60 dB in 10 dB steps
0.1 dB per step; maximum cumulative error 0.2 dB
Accuracy:
Model GM 351
Range: 60 dB 0.1 dB per 10 dB step
0.2 dB maximum cumulative error
Accuracy:
Model 415D
Range: 70 dB, input attenuator provides 60 dB in 10 and 2.5 dB steps
0.1 dB per 10-dB steps, 0.2 dB maximum cumulative
Accuracy:
error; 0.1 dB when switching from any 10-dB step (NORM) to any
2.5 dB step (EXPAND), except 0.05 dB when switching to 0.0
(EXPAND); 0.02 dB linearity on EXPAND scale.
SECTION II
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 Sets AN/GSM256, AN/GSM-259, and AN/GSM-287. Alternate items may be
used by the calibrating activity when the equipment listed in table 2 is not available. 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.
5. Accessories Required. The
accessories listed in
table 3 are issued as
indicated in
paragraph 4 above and
are used in this
calibration procedure. When necessary, these items
may be substituted by equivalent items, unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required
Common name
Manufacturer, model and (part number)
and/or
Minimum use
AN/GSM-256 and
Item
(official nomenclature)
specifications
AN/GSM-287
AN/GSM-259
A1
ATTENUATOR
Range: 0 to 10 dB
N/A
Hewlett-Packard, Model
355C (355C)
0.1%
Accuracy:
A2
ATTENUATOR
Range: 0 to 100 dB
N/A
Hewlett-Packard, Model
355D (355D)
0.1%
Accuracy:
A3
Range: 105 to 125 V ac
General Radio,
Same as AN/GSM-287
Model W10MT-
1%
Accuracy:
3AS3 (7910809)
A4
Range: -17.82 to
Hewlett-Packard,
Same as AN/GSM-287
252.35 V dc
Model 3490A-
OPTION060)
0.75%
Accuracy:
(3490AOPTION060)
A5
Range: 935 to 1070 Hz
Hewlett Packard,
Hewlett-Packard, Model
Model 5345A (MIS-
5245L (5245L)
COUNTER
0.75%
Accuracy:
28754 Type 1)
(MEASUREMENT
SYSTEM)
4