SECTION I IDENTIFICATION AND DESCRIPTION

TB 9-4920-454-35

SECTION I

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification.

This bulletin provides instructions for the

calibration of Tester, Exhaust Gas Temperature, Howell Instruments, Inc., Model

BH112JB-( ). The manufacturer's manual and TM 55-4920-401-13&P were used as the

prime data sources 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

6 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. Adjustments to be reported are designated (R) at the end of the sentence in which

they appear. When adjustments are in tables the (R) follows the designated adjustment.

Report only those adjustments made and designated with (R).

3. Calibration Description. TI parameters and performance specifications which

pertain to this calibration are listed in table 1.

Table 1. Calibration Description

Test instrument parameters

Performance specifications

Temperature

Range: 0 to 1399 oC

Accuracy: ±2 oC

% RPM

Range: 0 to 119.90% rpm

Accuracy: ±0.1% rpm

Standard day measurements, ambient Range: -41 to 139 oF

Accuracy: ±4 oC

temperature, and % RPM

±0.5% rpm

Resistance

Range: 4.21 Ω, 8.0 Ω, 15.0 Ω, and 22.0 Ω

Accuracy: ±.05 Ω

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 or AN/GSM-705. 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 parenthesis.