TM 11-6625-1541-15

Model 3400A

TM 11-6625-1541-15

Section II

Paragraphs 2-1 to 2-17

SECTION II

INSTALLATION

2-1. INTRODUCTION.

2-2. This section contains information and instructions necessary for installation and shipping of the Model

3400A RMS Voltmeter. Included are initial inspection procedures, power requirements, installation information, and instructions for repackaging for shipment.

2-3. INITIAL INSPECTION.

2-4. The Model 3400A RMS Voltmeter received a careful mechanical and electrical inspection before shipment. As soon as the Model 3400A is received, verify that the contents are intact and as ordered.

Although the instrument should be free of mars and scratches and in perfect electrical condition, it should be inspected for any physical damge which may have been incurred in transit. Also test the electrical performance of the instrument using the procedures

given in paragraph 5-5 .

Should

shipping of the instrument become necessary, refer

to paragraph 2-14 for repackaging and shipping

instructions.

2-5. POWER REQUIREMENTS.

2-6. The Model 3400A can be operated from any ac source of 115- or 230-volts (±10%), at 50 to 60 cycles.

With the instrument disconnected from the ac power source, move the slide switch (located on the rear panel) until the desired line voltage value appears.

The ac line fuse is a 0.25 amp, fast blow type for 115or 230-volt operation. Power dissipation is approximately 7 watts.

2-7. The Model 3400A is equipped with a three-prong power cord. To protect operating personnel, it is necessary to preserve the grounding feature of this plug when using a two contact ac outlet. Use a threeprong to two-prong adapter and connect the green pigtail lead on the adapter to ground.

2 - 8 . I N S T A L L A T I O N .

2-9. The Model 3400A is a submodular unit suitable for bench top use. However, when used in combination with other submodular units it can be bench and/or rack mounted.

T h e c o m b i n i n g c a s e a n d a d a p t e r frame are designed for this purpose.

2-10 COMBINING CASE ( Models 1051A or 1052A)

2-11. The combining case is a full-module unit which accepts various combinations of submodular units.

Being a full-module unit, it can be bench or rack mounted and is analogous to any full-module instrument.

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2-12. ADAPTER FRAME Part No. 5060-0797).

2-13. The adapter frame is a rack frame that accepts any combination of submodular units. It can be rack mounted only.

2-14.

REPACKAGING FOR SHIPMENT.

2-15. The following paragraphs contain a general

guide for repackaging for shipment. Refer to paragraph 2-16 if the original container is to be used:2-17

if it is not.

2-16. If original container is to be used, proceed as

follows: a.

Place instrument in original container if available.

b. Ensure that the container is well sealed with strong tape or metal bands.

2-17. If original container is not to be used, proceed as follows: a. Wrap instrument in heavy paper or plastic before placing in an inner container.

b. Use packing material around all sides of instrument and protect panel face with cardboard strips.

c.

Place instrument and inner container in a heavy carton or wooden box and seal with strong tape or metal bands.

d. Mark shipping container with “DELICATE

INSTRUMENT,“ “FRAGILE,“ etc.

2-1

TM 11-6625-1541-15

Section III

Figure 3-1

Model 3400A

1.

2.

3.

4.

5.

6.

Direct reading meter: dc meter which indicates rms voltage level of input signal.

Mechanical zero adjustment: screwdriver adjustment for zero of direct reading meter.

LINE ON pilot lamp: neon lamp which indicates when power is applied to instrument and power switch is ON.

Power switch: two-position toggle switch which applies 115- or 230-volts ac to instrument.

RANGE switch: 12-position rotary switch which selects various attenuation ranges available within Model 3400A.

INPUT connector: BNC jack which enables application of input signal to instruments measuring circuits.

7.

l15/230-volt switch: two-position slide switch which sets instrument to operate from either a 115- or 230-volt ac source.

8.

Input power jack: three-prong jack which enables application of line voltage to instruments power supply circuits.

9.

115V/230V/.25A FUSE: 0.25 ampere fuse which provides protection against line voltage surges.

10.

DC OUT jack: telephone-type jack which provides negative 1-volt dc out at full scale deflection, output is proportional to meter deflection.

Output impedance is 1000 ohms.

Figure 3-1.

Model 3400A Controls and Indicators

3-0

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