SECTION I IDENTIFICATION AND DESCRIPTION

TB 9-4920-364-35

SECTION I

IDENTIFICATION AND DESCRIPTION

1. Test Instrument Identification.

This bulletin provides instructions for the

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

BH112JA36. The manufacturer's manual and TM 55-4920-244-14 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 4

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

Potentiometer

Range: 0 to 1100°C

±1°C

Accuracy:

engine

operating

temperature

Thermocouple

Range: 0 to 135 V ac

±5 V ac

Accuracy:

EGT indicator

Range: 700°C

±10°C

Accuracy:

Resistance

Range: 4.21, 8.0, and 22.0

±0.25 on each position

Accuracy:

Rpm

Range: 0 to 10,000 rpm

±0.1%

Accuracy:

Insulation resistance

Range: 0 to 100,000

±10%

Accuracy: