Tabulated Data

TM 11-6625-537-14-1

c. Operating Temperature Range.

1-8. Description

(1) Within dc specifications from 40 F.

The Electric Voltmeter ME-202(*)/U is a single

to 105 F. De-rate accuracy at 0.001 percent per

chassis unit enclosed in a metal case. The meter,

F. outside these limits to 35 F. and 110 F.

o p e r a t i n g controls and input connectors are

(2) Within ac specifications from 55 F. to

mounted on the front panel. The adjustment of

95 F. De-rate accuracy at 0.005 percent per 0 F.

the front panel controls adjusts a precision dc

outside these limits to 35 F. and 110 F.

internal voltage to equal the external voltage

being measured; equality is indicated by a null on

CAUTION

the panel meter; ac voltages are first converted to

The standard cell may freeze if subjected

a dc voltage for measurement. The power fuse,

t o below freezing temperature. The

recorder output connectors, recorder gain and

e l e c t r o l y t e will freeze at 1 F. and

adjustment, a n d the power supply cord are

operation below 32 F. is definitely not

located on the back panel.

recommended.

d. Calibration. The 500-volt dc reference supply

1-9. Tabulated Data

is calibrated against a built-in standard cell.

a. Technical Characteristics. The technical data

e. Input Power. 115/230 vac, 50 to 440 Hz, 75

f o r the Electronic Voltmeter ME-202(*)/U in-

watts.

eluding ranges, accuracy and tolerances are listed

f. Number of Tubes. 8.

in tables 1-1 through 1-7.

g. Weight. 28 l b s .

b. Stability of Reference Supply.

1-10. Items Comprising an Operable Equipment

(1) 0.0025 percent for 10 percent change in

line voltage.

Electronic Voltmeter ME-202(*)/U comprises an

(2) 0.005 percent per hour after 30-minute

operable equipment.

w a r m u p (adjustable front panel CALIBRATE

control).

Table 1-1. Conventional Vacuum Tube Voltmeter Specifications*

Scale

Input impedance

Range

500-0-500

0 to 500 Vdc

50 megohms

50-0-50

0 to 50 Vdc

50 megohms

10 megohms

10-0-10

0 to 10 Vdc

5-0-5

0 to 5 Vdc

50 megohms

1-0-1

10 megohms

0 t0 1Vdc

0.5-0-0.5

50 megohms

0 to 0.5 Vdc

0.1-0-0.1

10 megohms

0 to 0.1 Vdc

0.01-0-0.01

1 megohm

0 to 0.01 Vdc

0-500

1 megohm 35 f

0 to 500 Vac

0-100

1 megohm 35 f

0 to 100 Vac

0-50

1 megohm 35 f

0 to 50 Vac

0-10

1 megohm 35 f

0 to 10 Vac

0-5

1 megohm 50 f

0 to 5 Vac

0-1

1 megohm 35 f

0 to 1 Vac

1 megohm 50. f

0-0.5

0 to 0.5 Vac

0-0.1

1 megohm 35 f

0 to 0.1 Vac

0-0.01

1 megohm 50 f

0 to 0.01 Vac

0-0.001

1 megohm 50 f

0 to 0.001 Vac

* Accuracy: 3 percent on all ranges

1-2