DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

TB 55-4920-389-34

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR TEST STAND, IGNITION MAGNETO HYDRAULIC

TECHNOLOGY, INC. MODELS 6990A

Headquarters, Department of the Army, Washington, D. C.

13 May 1977

Section I. IDENTIFICATION AND DESCRIPTION

1-1. Test Instrument Identification.

This bulletin provides instructions for the calibration of Ignition Magneto Test Stand. The Ignition Magneto T.S. will

be referred to as the "test instrument" throughout this bulletin.

Nomenclature: Ignition Magneto Test Stand

FSN:

4920-00-

Manufacturer: Hydraulic Technology Inc.

Model:

6990 and 6990A

Model variation:

Only difference is the size.

Technique:

DC and low frequency

1-2. Calibration Description.

Test instrument parameters and performance specifications which pertain to this calibration are listed in table 1-1.

Table 1-1. Calibration Description

Test instrument parameters

Performance specifications

RPM Indicator (dual range)

Range: 0-500, 0-5000 RPM

Accuracy: +3.0% of F.S. for each range

AC Ammeter (dual range)

Range: 0-2.5, 0-5.0 amps a.c.

Accuracy: +3.0% of F.S. for each range