(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
substitution method.
(1) Adjust R17 for -1250 volt indication on
b.
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
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