Section I. GENERAL
This manual describes Voltmeter, Electronic AN/URM-145D and provides operator and
m a i n t e n a n c e instructions, testing procedures and schematic diagrams.
CONSOLIDATED INDEX OF ARMY PUBLICATIONS AND BLANK FORMS
Refer to the latest issue of DA Pam 310-1 to determine whether there are new
e d i t i o n s , changes, or additional publications pertaining to this equipment.
MAINTENANCE FORMS, RECORDS, AND REPORTS
a. Reports of Maintenance and Unsatisfactory Equipment. Department of the Army
forms and procedures used for equipment maintenance will be those described by TM
38-750, The Army Maintenance System.
b . Report of Packaging and Handling Deficiencies. Fill out and forward SF 364
(Report of Discrepancy (ROD)) as prescribed in AR 735-11-2/DLAR 4140.55/NAVMATINST
4355.73A/AFR 400-54/MC0 4430.3F.
c. Discrepancy in Shipment Report (DISREP) (SF 361). Fill out and forward Dis-
crepancy in Shipment Report (DISREP) (SF361) as prescribed in AR 55-38/NAVSUPINST
4610.33C/AFR 75-18/MC0 P4610.19D/DLAR 4500.15.
R E P O R T I N G E Q U I P M E N T I M P R o vE M E N T R E C O M M E N D A T I O N S ( E I R )
If your AN/URM-145D needs improvement, let us know. Send us an EIR. You, the user,
are the only one who can tell us what you don't like about your equipment. Let us
know why you don't like the design. Tell us why a procedure is hard to perform. Put
it on an SF 368(Quality Deficiency Report). Mail it to Commander, US Army Communi-
cations-Electronics Command and Fort Monmouth, ATTN: DRSEL-ME-MP, Fort Monmouth NJ
07703. We'll send you a reply.
Adminstrative storage of equipment issued to and used by Army activities shall be
in accordance with TM 740-90-1.
DESTRUCTION OF ARMY ELECTRONICS MATERIEL
Destruction of Army electronics materiel to prevent enemy use shall be in accordance
with TM 750-244-2.
S e c t i o n II. Description and Data
D E S C R I P T I O N AND USE
a. Voltmeter, Electronic AN/URM-145D is a sensitive, wide band instrument for
t h e measurements of voltages from 100 microvolt (V)to 3 volts (V) spanning a fre-
quency range of 20 kilohertz (KHz) to 600 megahertz (MHz).
b. The general` purpose rf probe supplied employs a fullwave germanium diode de-
t e c t i n g c i r c u i t . In the square-law region(100V to 30mV) the voltmeter is true RMS
r e s p o n d i n g . In the transition region(30mV to 1V)the characteristics of the probe's
d e t e c t i n g circuit changes gradually from RMS to peak. In the linear region (1V to
3V) the voltmeter is peak responding.