TB 9-6625-151-40
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment to be used in this
calibration procedure. This equipment is issued with Secondary Reference Calibration
Standards Set, NSN 4931-00-621-7878. 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 parentheses.
Table 2. Minimum Specifications of Equipment Required.
Manufacturer and model
Common name
Minimum use specifications
(part number)
FREQUENCY COUNTER
Agilent, Model 53131A w/ opt 010
#1
Resolution: 0.001 Hz
(AN/USM459B)
FREQUENCY COUNTER
Fluke, Model PM6681/656
#2
Resolution: 0.001 Hz
(PM6681/656)
FUNCTION GENERATOR Range: 20 ms Burst Pulse at 4.5 V
Agilent, Model 33250A (33250A)
#1
Range: 40 ms Burst Ramp at +5 V, -5 V No substitution
Accuracy: 0.00125%
FUNCTION GENERATOR Range: 20 ms Burst Pulse at 5V
Agilent, Model 33250A (33250A)
#2
Range: 2 sec Burst Pulse at 4.5V
No substitution
Accuracy: 0.00125%
Range: 1000 V dc
Fluke, Model 8846A (8846A)
Accuracy: 2 V dc
Agilent, Model 54831M
(OS-303/G)
5. Accessories Required. The accessories 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 3. Accessories Required.
Manufacturer and model
Common name
Minimum use specifications
(part number)
CALIBRATION
Intertek, ITS Calibration Amplifier
Used to route pulse signals to TI.
AMPLIFIER
(74600100)
POWER SUPPLY #1
Range: 24 V dc, 2.5 A
Sorenson, Model 20-250A (MIS-35935)
POWER SUPPLY #2
Range: -12 V dc, 0.5 A
Sorenson, Model DCS40-30E
(13589313)
CALIBRATION PROCESS
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common