TB 9-4931-406-40
EQUIPMENT REQUIREMENTS
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 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
between the standard and the TI. Where the four-to-one ratio cannot be met, the four-to-
one accuracy will be listed and the actual accuracy of the equipment selected is shown in
parentheses.
5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this
calibration procedure.
NOTE
For ease of formula calculations in this procedure, a
spreadsheet
is
available
at
the
following
url:
https://usata.redstone.army.mil/tbs/9/4931/0406/.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
CALIBRATOR
Range: -3 to 3 V dc
Fluke, Model 5720A (5720A)
Accuracy: 0.025%
(p/o MIS-35947)
DIGITAL MULTIMETER
Range: 0 to 10 mV dc
Hewlett Packard, Model 3458A
NO. 1
Accuracy: 0.008%
(3458A)
DIGITAL MULTIMETER
Range: 0 to 10 mV dc
Hewlett Packard, Model 3458A
NO. 2
Accuracy: 0.008%
(3458A)
RF REFERENCE SOURCE
Range: 400 Hz to 100 MHz
Fluke, Model 9640A-LPN
Accuracy: 0.033%
(9640A-LPN)
THERMAL CONVERTER
Range: 10 Hz to 100 MHz
Ballantine, Model 1394 Series
Accuracy: 10 Hz to 50 kHz 0.025% (0.05%)
(MIS-10221)
50 kHz to 1 MHz 0.05% (0.1%)
1 to 10 MHz 0.1% (0.2%)
10 to 30 MHz 0.25% (0.5%)
30 to 100 MHz 1% (2%)
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.