TB 9-4920-364-24
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
Range: 0 to 1100 C
Potentiometer
1 C at engine operating
Accuracy:
temperature
Thermocouple
Range: 0 to 135 V ac
5 V ac
Accuracy:
Range: 700 C
EGT indicator
10 C
Accuracy:
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:
