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MODEL 616
INPUT
L O
2 .
Gain Selection Logic.
25776D. 25778E) .
A three line ranging code is
used to determine voltage sensitivity.
for the three lines (R 4 ' R 2 ' Rl) is given in Table
4- 3 .
TABLE 4-3.
Ranging Logic
R
. 01000 V
0
. 1000
V
1
l . 000
V
1
10 . 00
V
1
100 . 0
V
1
0
where
1
,
,
1175
,
ZERO
,
CHECK
FIGURE 25 .
Voltmeter Configuration - NORMAL Mode .
(Refer to schematics
The coding
Rangin.g Lines
- -
--
0
0
0
1
1
0
1
1
open state
+5V state
R
RANGE
ZERO
FIGURE 26 .
Amme ter Configuration - FAST Mod e .
,
�CA5E
,
3 .
Zero Adjustmen t .
internal zero adjus tment for calibrating the " lVIl
recorder output.
f .
Ammeter Operation.
In the AMPERE mode , a range resistor (RIOl through
RIll) is connected between input HI and GUARD .
current-to-voltage conversion is determined by the
following relationship:
I x
E R
R
E R
voltage developed across R
I
input current
c
R
range resistor
In the "NORMAL" mode , the input voltage drop is
equivalent to
In the "FAST" mode, the input
drop is a funct l on of open loop gain (typically
20�V ) .
The use of the FAST mode i s limited to
ranges lO - 5 A to lO -ll A due to loading and stability
considerations.
+
THEORY OF OPERATION
X,
LO
OND
Potentiometer R311 is an
(Refer to schematic 25764E) .
The
23
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