General Instructions

TB 11-6625-821-35

4. General Instructions

a. Calibration Reporting. During the performance of this procedure, annotate DA

Form 2416 Calibration Data Card in accordance with TM 38-750. Adjustments to be

annotated on DA Form 2416 are followed by (R) in this procedure.

b. Unit Under Test. Direction Finder Set Test Set AN/ARM-93 is the item being

calibrated and will be referred to as the unit under test in the remaining text.

Note

Be familiar with the entire procedure prior to performing

calibration.

5. Difference Among Models. None.

SECTION II

CALIBRATION

The equipment required for performance checks and

6. Equipment Required.

adjustments is listed in table 1. When any of the equipment listed in table 1 is not

available, use an equivalent calibrated item.

Table 1. Equipment Required for Calibration Performance Checks and Adjustments

A - Authorized Calibration Equipment

Common name

Minimum use specifications

Calibration equipment

Frequency meter

AN/USM-207 or SD-1037M2

Range: 400 Hz ±10%

Voltmeter

ME-202/U or Dana 5700 series

Range: 30 Volts ac ±0.5%

Voltmeter RF

For a null indication

ME-30/U or H-P 400 series

Oscilloscope

For lissajous pattern

AN/USM-281 or H-P 180 series

Signal generator

Range: to 1700 kHz

AN/URM-25 or equal

Power supply

Range: 27.5 Volts dc

CS36CR30 or equal

B-Authorized accessories

Banana plug to banana lead. (2 required) Banana plug to pin adapter, (2 required) and Banana plug to

alligator clip (quantity as required) Fabricated cable. (figure 1) Some modification of this cable is permissible

as to size, length, and loose ends.

Figure 1. Fabricated cable for the BEARING INDICATOR, construction details.