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Section 1-DM 505
SPECIFICATION
Introduction
The DM 505 Digital M ultimeter measures
resistance, dc
or ac voltage, and dc
or
ac current. The AC functions
respond to the average value of an ac current or voltage
and
the
readout displays the sinusoidal rms value. In the
resistance mode
of
operation, the HI n-LO
fi
pushbut-
ton selects either of two full-scale probe tip voltages.
The
front panel pushbuttons select the functions and
ranges. The INPUT pushbutton selects front panel
con-
nector input ( EXT) for current, voltage and resistance
measurements, or
rear interface
connector input (INT) for
voltage and resistance measurements. The readout is
a
3
1/2
digit display using seven-segment LED. The decimal
point is automaticaSly positioned by the range pushbut-
tons. The polarlty signs for dc voltage and dc current
measurements are
also
displayed automatically.
A
blink-
ing display indicates overrange except on the
1000
Y dc
and
500
Y ac ranges. The reading rate
I S
approximately
three readings per second.
Performance
Conditlons
The electrical characteristics
are
valid only if the
DM 505 has been calibrated at an ambient temperature
between
+21°C
and
i-25"
C
and
is operating at an ambient
temperature between O0
C
and
4-50"
C, unless otherwise
noted.
Items listed in the Performance Requirements column
of the Electrical Characteristics are verif led
by completing
the Performance Check in this manual. Items listed i n the
Supplemental Information column are not verified i n this
manual. They areeither explanatory notes or performance
characterist~cs for which no limits are specified.
ELECTRICAL CHARACTERlSTlCS
Front Panel
Table
1-1
0 C VOLTMETER
Supplemental information
Characteristics
Accuracy for the 200
mV,
2 V,
20 V,
200
V, and
1000
V ranges:
+I 8" C to +28" C
200
mV
to
200
V
ranges
1000
Y range
Performance Requirements
+(O.l% of reading
+
0.05°h
of full scale)
f
(0.1% of reading
+
O.T% of full scale)
O°C to +18"C,
+28"C
t o
+50°C
200 mV t o 200 V ranges
1006
V range
Common Mode Rejection
Normal Mode Rejection Ratio
Maximum Resolution
Response Time
Input Resistance
it(0.2% of reading
+
0 . 1
%
of
full scale)
f
(0.2% of reading f 0.2% of full scale)
3100 dB at
dc.
280
dB at
50
to 60 Hz.
350
dB at
50
and 60 Hz
k0.2
Hz.
Verified with
1
kR unbalance at
the LOW terminal.
(Clock frequency: 20.48
kHz
tl%.)
1 00
pV
<0.5 second to rated accuracy.
f 0 M f l
f 0.5%.
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