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Table 1-2. Ac Voltage Ranges*
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TM-11-6625-444-14-2 Voltmeter Digital AN/GSM-64C (NSN 6625-01-124-0834) (EIC: KNK) Manual
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Figrue 1-2. Outline Drawing, Portable Configuration

TM 11-6625-444-14-2
Table 1-3. Ac Voltage Accuracy
ACCURACY **
FREQUENCY
± (0.1% of reading + 400 counts)
dc (coupled)
± (0.2% of reading + 600 counts)
0.5 Hz to 1 kHz
± (0.2% of reading + 400 counts)
1 kHz to 30 kHz
± (0.8% of reading + 400 counts)
30 kHz to 100 kHz
± (1.5% of reading + 600 counts)
100 kHz to 300 kHz
± (3.0% of reading + 4000 counts)
300 kHz to 1 MHz
** Applies from 20,000 counts to 199,999 counts over a 90 day period at + 23°C ±2°C.
Relative humidity less than 90%.
shunted by
(a) Input impedance: 1 M
(4) Shock and Vibration: Meets require-
ments of MIL-STD-810; Procedure IX, Method
less than 50 pF (less than 100 pF rear input)
514 and Procedure V, Method 516
(b) Temperature coefficient: ±(0.01%
(5) Ac voltage:  100/120/220/240 V ±10
rdg + 6 LSD + 3 uV)/°C Up to 10 kHz. ±(0.02%
% single phase, sinusoidal 50 to 400 Hz
rdg + 10 LSD + 3 uV)/°C for 10 kHz to 1 MHz.
(6) Power: 50 watts
(c) Low pass filter: -3 dB at 10 kHz
(7) Display:  5½ digit, ± polarity sign, 7
300
(to 40 Hz)
(d) Response time:
s e g m e n t LED, 0.43 inch (11 mm) character
30 sec (to 0.5 Hz) slow.
normal.
height, characters bright red
90 dB
(e) Common mode rejection:
at 60 Hz
c. Mechanical
(f) Crest factor:  Full range (199,999
3.50 inches (88.9 mm)
(1) Height:
counts) 5 to 1. Half range (100,000 counts) 10
to 1.
16.75 inches (425.5 mm)
(2) Width:
(3) D e p t h : 17.12 inches (434.8 mm) be-
b. General
hind panel 17.625 inches (447.7 mm) overall.
(1) Temperature:
0 to 50°C operating.
(4) Weight: 18 lbs.
-55°C to +75 C storage.
(2) Humidity: Meets requirements of MIL-
STD-810; Procedure II, Method 507
1-8. Hems Comprising an Operable Equipment
(3) Altitude:  Meets requirements of tvllL-
Digital Voltmeter AN/GSM-64C, power cable
STD-810; Procedure 1, Method 500
and test leads comprise an operable equipment.

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