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MODEL 244
CALIBRATION
c).
Set controls
on 662 as follows:
RANGE FULL SCALE
50 volts
NULL FULL SCALE
1 In"
DIALS
20.000
POLARITY
(-)
d).
Turn 244 OUTPUT on.
662 should
now read
zero center
scsle,
if not
set dials
on 662 until
zero reading
is obtained.
e).
Adjust
Load Box between
0 mA and 10 n-4.
Reading
an 662 shall
not change more than 14
major
divisions.
f).
Adjust
Load Box for
0 mA. Load and vary
line
voltage
from 105 VAC to 125 VAC.
Reading
on 662 shell
not change more than +2 major
div-
isions.
Return
line
voltage
to 117 "AC.
g).
Turn 244 output
off.
3.
Accuracy.
a).
Connect
output
of 244 to input
of W-1
1OO:l
Divider.
Connect
output
of W-1
to input
of 662.
b).
Set 244 to -200 volts.
Set the 662 controls
as follows:
RANGE FULL SCALE
5 Volts
NULL FULL SCALE
1 volt
DIALS
2.0000
POLARITY
C-1
c),
Turn 244 oofput
switch
on.
The 662 should
now read
-2
volts.
Turn 244 CAL-25"
pot full
CW.
The 662 should
now read -2.2000
volts
to -2.2500
volts.
Return
CAL-25"
pot full
CCW. Turn 244
output
switch
off.
d).
Set 661 control.
as follows:
RANGE FULL SCALE
5 Volts
NULL FLlLL SCALE
100 In"
DIALS
2.2000
POLARITY
C-1
e).
see 244 controls
for
-220 volts
and turn
244 output
s"itch
on.
f).
Step 662 and 244 thru
settings
listed
in
Table
6-2
take
reading
shown.
Reading
must be
within
range
given.
Turn output
off
when com-
pleted.
TABLE 6-2.
Accuracy
Check.
220
2.178
-
2.222
240
2.376
-
2.424
260
2.574
-
2.626
280
2.772
-
2.828
300
2.970
-
3.030
320
3.168
-
3.232
3.4000
340
3.366
-
3.434
3.6000
360
3.564
-
3.636
3.8000
380
3,762
-
3.838
4.0000
400
3.960
-
2.0000
200
1.980
-
4.0000
Change 662 to 50
6.000
8.000
10.000
Change 662 to 1
12.000
14.000
16.000
18.000
20.000
400
3.960
-
volts
Range Full
Scale
600
5.940
800
7.920
-
1000
9.900
-
volt
Null
Full
Scale
1200
11.880
-
1400
13.860
-
1600
15.840
-
1800
17.820
-
2000
19.800
-
4.040
2.020
4.040
6.060
8.080
10.100
12.120
14.140
16.160
18.180
20.200
4.
Output
Noise.
a).
Set 244 for
-2000 volt
output.
Connect
244 output
to input
of W-1
and TRMS voltmeter
to ac out connector.
Set TRM.9 voltmeter
on 300
volt
range.
b).
Turn 244 output
switch
on.
Place
short-
open switch
on W-1
to open and step TRMS volt-
meter
to 1 mV range.
Meter
should
read no higher
than 500 microvolts.
1. Vary
line
voltage
from 105 VAC to 125 VAC.
2. Return
line
voltage
to 117 VAC.
c).
Place
open-short
switch
on W-1
to short
and turn
244 output
and power switches
off.
Un-
plug
244 from "ariac.
0771
21
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