SECTION I IDENTIFICATION AND DESCRIPTION

TB-9-6685-330-35 Pressure Gages Differential (General) Manual
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TB 9-6685-330-35

SECTION I

IDENTIFICATION AND DESCRIPTION

This bulletin provides instructions for the

1. Test Instrument Identification.

calibration of Pressure Gages Differential (General). Calibration and Repair Requirement

Worksheet, DA Form 3758, and various manufacturers' manuals were used as the prime

data sources in compiling these instructions. This bulletin complies with ANSI B40.1-1980

specification for indicating dial type elastic element pressure gages. The equipment being

calibrated will be referred to as the TI (test instrument) throughout this bulletin.

a. Model Variations. Variations among models are described in text.

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

a. Forms, records, and reports required for calibration personnel at all levels are

prescribed by TB 750-25.

b. Figure 1 is a blank calibration data sheet used as a guide for keeping records, and

can be reproduced locally.

3. Calibration Description. TI parameters and performance specifications which

pertain to this calibration are listed in table 1.

Table 1. Calibration Description

Test instrument

Performance

parameters

specifications

Pressure

Range: 0 to 60 psi

Accuracy: 5% of reading

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 Set AN/GSM-286. 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.