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OPERATING INSTRUCTIONS
b.
Automatic Sensitivity Operation.
morle, the Model 616 automatically selects the pro
per sensitivity in accordance with the following
rules.
1.
If the display reading is be
Upranging.
tween 0-1-8-0 and 1-9-9-9 and the input signal
is increased beyond 1-9-9-9, the Model 616 auto
matically up-ranges to the next higher (less
sensitive) range.
The three least significant
digits are blanked during range changing
to prohibit incorrect readings from being dis
played.
If the input signal exceeds ±199.9 volts
the display will continue to indicate up to ±20 1 . 7
volts but the three least significant digits will
flash on and off to indicate an over voltage
condition.
Down ranging.
2 .
at least 0-1 - 8-0 and the input signal is decreased,
the Model 616 automatically down ranges to the next
lower (more sensitive) range.
c.
Remote Sensitivity Selection.
616 is used with the Model 6162 Isolated Output/
Control, the 616's voltage sensitivity may be re
motely selected.
The output connector on the rear
panel of the 6162 provides four isolated control
lines for the purpose of remote sensitivity pro
gramming.
The lines are coded as shown in Table
3-2.
The 6l6's front panel SENSITIVITY switch
must be set to AUTO position.
TABLE 3 - 2.
Remote Sensitivity Programming Logic
Sensitivity
MR'
.01000 V
.1000
V
1.000
V
10.00
V
100.0
V
The Manual Range line MR is used to defeat
the automatic sensitivity feature.
is open, the 616 returns to automatic opera
tion.
Logic 1
open, Logic 0
=
ground.
HOW TO SELECT RANGE ON OHMS, COULOMB, AND AMPERE.
3-5.
The front panel RANGE switch (S101) provides selection
of four functions, VOLT, OHMS, COULOMB, and AMPERE as
described in paragraph 3-3.
selection of ranges is provided; 8 ranges on OHMS, 4
ranges on CqULOMB, and 11 ranges on AMPERE.
the SENSITIVITY switch 1s used in conjunction with
the RANGE Switch, the actual number of useable spans
is 1 2 decades on OHMS, 8 decades on COULOMB, and 11
on AMPERE.
NOTE (ON AMPERE FUNCTION)
On the lO - lA to 10 - 4A ran
veloped must not exceed 2 volts, otherwise,
overheating of a range resistor could result.
As a result, the 10 volt and 100 volt sensi
tivity. settings are not recommended for 10 -l A
10 -4 A ranges.
to
6
In the AUTO
80
as
If the display reading is
When the Model
Control Lines
R
R
R
4
2
l
0
0
0
0
0
1
0
0
0
0
1
1
0
1
1
0
0
1
1
1
*NOTE
When MR
=
closure to
For each function, a wide
Since
g
es, the voltage de
To interpret a reading on OHMS, COULOMB, or AMPERE
ranges both the digital display (with decimal location)
and the RANGE setting(powers of ten)should be consi
dered.
For example, given a digital reading of 17 . 3 2
and a RANGE setting of 10 - 7 AMPERE, the actual meas
ured value would be interpreted a s 17.32
Since the decimal point is moveable, it is important
to notice the position of the demimal point to deter
mine the full range of the instrument. See Table 3-3
for typical range settings in the AMPERE function.
TABLE
Typical Current Range Settings*
Input
Range
Current
15
ll
10 -
A
lO-
A
14
-11
10-
A
10
A
13
ll
lO-
A
lO-
A
1 2
11
10-
A
10-
A
-ll
-11
lO
A
10
A
*The current reading is interpreted by multiplying the
display reading times the range setting.
rents not shown can be measured by selecting the
appropriate RANGE switch setting in decade steps from
lO - ll A to 10 - l A.
HOW TO MEASURE VOLTAGE.
3
6.
-
used to measure voltages from ±10 microvolts to ±200
volts.
Although the Model 616 is useable as a gener
al purpose digital voltmeter, it has certain charac
teristics which enable reliable measurements from
very-high source resistances.
�
2
mode, the M
el 616 has an input resistance greater
Q.
than
x 10
As a result, the loading of the
2
source circuitry is relatively insignificant when
compared to typical digital voltme�ers having 10 8
ohms input resistance.
farads of shunt capacitance (not including the input
cable capacitance).
Since a large amount of capaci
tance causes a slowing of response, the input capaci
ty
should be kept as small as possible.
,
a.
Measurements From Very H1gh Source Resistance.
To use the Model 616 as a voltmeter, set the front
panel controls as follows:
RANGE
SENSITIVITY
FAST/NORMAL
Connect a Model 6011 Triax Cable (or other shielded
triaxial cable) to the INPUT receptacle.
length as short as possible to reduce the slowing
effects of cable capacitance.
need occasional adjustment to reduce any voltage
offset which may occur due to temperature variations.
To rezero the Model 616, set the ZERO CHECK switch
to
CHECK position and adjust the front panel ZERO
control for a 0-0-0-0 display.
vides a dir�ct reading voltage display with automatic
decimal point position and polarity.
MODEL 616
x
10- 7 ampere.
3-3.
Sensitivity
Digital
10 mV
.00010
10 mV
.00100
10 mV
.01000
100 mV
.1000
V
1
1 . 000
Other cur
The Model 616 can be
When used in the VOLT
The Model 616 has 20 pico
VOLT
AUTO
NORMAL
Keep cable
The zero control may
The Model 616 pro
04 7 6
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