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  TM 11-6625-444-14-1
3-9. Dc Ratio Measurement
equal, the readout is +100 percent. If the input is
10 times greater than the reference, or vice versa,
The RATIO mode of operation allows comparison
the readout will be ± 1000 percent. Ratio mode
of a measured input voltage to a fixed, external
reference voltage. In this mode of operation, the
reference voltages, inputs, and the readouts are
readout is expressed in percent (%) of difference
given in table 3-2. Overrange limits are shown in
between the measured input and the external
reference voltage. For example, if both inputs are
mode, proceed as follows:
Ext ref
Input
Selected
Readout
(V REF ) (VDC)
voltage (VDC)
range
(%)
±1.0
to
10V
0 to 1.2VxV REF
. .0 to ± 119.999
1
0
.
.
.
.
..0 to ± 1199.99
0 to 12VxV REF
100....
.
0 to 120VxV REF
. . . . . 0 to ± 11999.9
1000.......
0 to 120VxV REF
. . . 0 to ± 11999.9
AUTO. . . . .
±10 to ± 100V
0 to 0.12 VXVREF
0 to 311.9999
10
.
.
.
0 to ± 1.2 VxV REF
.0 to ± 119.999
100...
.
0 to ± 12VxV REF
. . . 0 to ± 1199.99
1000.
. . . 0 to ± 1199.99
0 to ± 12 VxV REF
AUTO.
J40 pin #
Logic or function
A
.
.
.
.
.
.
. .. SIG NO1
B
.
.
.
.
.
.
.
.C C O
C
........
.
POL
MEM
D........
FILT
E
.
.
.
. EXT TRIG
F . . . . . . . . . . . . .. FUNCTION REMOTE BUSS
G . . . . . . . . . . . . . . . . cmv
H.............C
J.........
VAC INTERLOCK
K...........K
L . . . . . . . . . . . . . bmv
M
.
.
.
.. F
N.........a
O...........
B
P
.
.
.
.
.
+ 5V
Q
.
.
.
.
R . . . . . . . . . . INT REF DISABLE
S
.
.
.
.E
T
.
.
.
.A
U.
.
.
.
.
.
.
M
V
.
.
.
. LOGIC COMMON
W......:.
ZERO
X
.
.
.
. VAC DN ENABLE
Y
.
.
.
.D
Z.
.
.
.
.
GUARD
a. Measure the input voltage in accordance
d. Observe the readout to obtain the per-
with paragraph 3-8.
centage difference (ratio) between the measured
b. Apply the external reference voltage to the
input and the external reference. The polarity
EXT REF terminals on the rear panel.
sign indicates whether the measured input is
c. Depress the RATIO FUNCTION switch.
above (+) or below (-) the external reference.
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