Power Supply.

(4) If voltmeter does not indicate between -

NOTE

1732.5 and -1767.5 volts, perform b(2) below.

The initial 20 dB of frequency doubler

(5) Connect voltmeter across decade

attenuation is the most frequency-

resistor (A2) and adjust decade resistor to 20 ohms.

sensitive, and hence the most subject to

(6) Connect TP1 (fig. 1) of TI to voltmeter,

error. If the range from O to 20 dB is

using adapter and cable (B2 and B5).

within tolerance, the remaining 80 dB will

(7) If voltmeter does not indicate between

certainly be in tolerance. If the full 100

414 and 506 mV (millivolts), perform b(3) below.

dB is to be checked, use the standard IF

b. Adjustments (fig. 1)

substitution method.

(1) Adjust R17 for -1250 volt indication on

Adjustments. No adjustments can be

voltmeter (R).

made.

(2) Adjust R37 for -1750 volt indication on

NOTE

voltmeter (R).

Do not perform power supply checks if

(3) Adjust BEAM CUR AD R44 for 460 mV

all other parameters are within

indication on voltmeter (R).

tolerance.

a. Performance Check

12. Power Supply.

13. Final Procedure. a. Deenergize and disconnect

(1) Connect voltmeter (A7) between signal

all equipment and reinstall TI protective cover.

source TB 1-2 (fig. 1) and chassis ground, using high-

b. In accordance with TM38-750, annotate and

voltage probe supplied with voltmeter.

affix DA Label 80 (US Army Calibration System). When

(2) If voltmeter does not indicate between -

the TI cannot be adjusted within tolerance, annotate and

1237.5 and -1262.5 volts, perform b(1) below.

affix DA Form 2417 (Unserviceable or Limited Use) tag.

(3) Connect voltmeter to TP2 (fig. 1) and

chassis ground, using high-voltage probe.

By Order of the Secretary of the Army:

BERNARD W. ROGERS

General, United States Army

Chief of Staff

Official:

J. C. PENNINGTON

Brigadier General United States Army

The Adjutant General

Distribution:

To be distributed in accordance with DA Form 12-34A, Requirements for Calibration Procedures Publications.

*U.S. GOVERNMENT PRINTING OFFICE: 1978-765-096/700