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Calibration
Procedure (Performance Check)-DM
505
8. Check Ac Current Accuracy
a.
Connect the current calibrator outpul through a
coaxial cable
and
the
necessary
adapters to the
mA and
LOW connectors. Connect the ac voltage calibrator
output
through a coaxial
cable
and
adapterstathe current
calibrator input.
b, Press
the mA AC
button
and set the DM 505 range
buttons and the Current
source
output, as shown i n Table
4-6, at any frequency from 45 Hz
t o
10
kHz.
c. CHECK-that
the
display reads within the limits
for
the
ambient temperature as listed in Table 4-6.
d. Set the current source t o
0 A and disconnect it from
the DM
505.
REAR INTERFACE PERFORMANCE
CHECK PROCEDURE
f o verify instrument accuracy of resistance
and
ac and
dc voltage modes via the DM 505 rear interface, followthe
steps outlined
in
the Performance
Check
procedure for
the
f ront panel input, but apply voltages and resistances t o
rear interface pins 28B (HI)
and 28A (LO). Access to
the
rear
interface input pins 28A (LO)
and 28B (HI)
i s most
easily made using
a TM 500-series
Option 2 power
module. Press the INPUT EXT-INT pushbutton (INT
position) to select rear interface input. Substitwte Tables
4-7, 4-8, and 4-9
for
the appropriate tables listed in the
Performance Check procedure.
NOTE
The inprrf
cable
fixture from
the
calibrating
sources
to the rear
interface
pins will
have
fo be
modified
to
accommodate
accuracy
checks
via the rear
interface.
Table 4-6
AC CURRENT ACCURACY
Table 4-7
DC VOLTAGE ACCURACY
FOR REAR INTERFACE
DM 505
Range Button
-
200
pA
2
mA
20
mA
200
m
A
2000 m
A
Ac Current
DM 505
Range Button
200
rnV
2
Y
20
V
200
V
1000
V
(max. input
200 V peak)
Display Umits
Dc Calibrator
Source
4-18"
C
to
-t2e°C
O
to +18OC, +28*
C
to +50°
C
p
p
p
p
Display
LFmits
180.000
pA
1.80000
mA
18.0000
mA
180.000 rn
A
1800.00 mA
Volt
age
180.000
mV
1.80000 V
18.0000
V
180.000
V
180.000
V
178.5
to 181.5
1.785
to
1.815
17.85
to 18.15
f 78.5 to 181.5
1785 to 1815
177.5
t o
182.5
1.775
to
1.825
17.75
to
18.25
177.5
to
182.5
1775
t o 1825
+I
8 O C to + 2 8 O C
179.7 to 180.3
1.797 to
1.803
17.97 to 18.03
179.7
to 180.3
178 to 182
0 to
+lR°C,
+28"C to
-1-50°C
179.4 t o 180.6
1.794 t o 1.806
17.94 to 18.06
179.4 t o 180.6
177 to
183
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