8 Two Wire
Four Wire
.
two wire test lead
connections always use the far left input
jacks
V
V
mode switch
in the 2 Wire
position
should be used for
all voltage, current and simple ohms
include all in-series wiring resistance
4 Wire Kelvin
.
input or
Kelvin mea-
surement test lead connection inputs and mode
selection switch For
both
‘red’ and
‘white’, which
are shown as a dotted line below in item # 8.
The
must also be
. Two wire mode
mea-
surements. 2 wire electrical resistance measure-
ments
from the meter out to the "resistance under test"
and back to the meter (connection/contact resis-
tance, test lead length, harness wiring length and
more etc.). The "Four Wire" switch position is
only for 4 Wire Kelvin resistance measurements
only. Basically the 4 Wire Kelvin connections
minimize the impact of test lead length resis-
tance and test lead contact resistance offsets. A
discussion on
may be found
further in this manual.
The
High
Low
9. Zero
(for the lower 3 re-
sistance ranges)
A.)
B.)
.0000 without a minus sign.
- The AMPTEC 601ES Explosive
Safety DMM has a precision ten turn zero pot.
zero knob is turned to "null-out" most
2 wire test lead resistance
. The zero adjust procedure in-
volves:
Short the test leads at the “UUT” end to-
gether while connected to the AMPTEC 601ES
DMM then
adjusting the zero knob until the
display shows
If
you get a minus sign while adjusting the zero,
you have over adjusted the zero knob. If this is
the case, turn the knob back the opposite direc-
tion until the minus sign is no longer displayed.
Once the zero is adjusted you can connect your
test leads to the "device under test". Re-zeroing
(2 wire mode) will be necessary only if you
change test leads. Do not force the zero knob
when turning it, especially once the stops have
been reached. Forcing the zero knob past the
stops will severely damage the precision of the
instrument and violate the instruments warranty.
( 2, 20 ,and 200 ohm ranges)
10. Case/Chassis Ground Jack
(not tied to earth ground)
A.)
B.)
provides the
user access to the AMPTEC 601ES DMM’s
Faraday Cage and Chassis ground. In some ap-
plications (i.e. anti-static) the AMPTEC 601ES
DMM user may want to connect your "In-House
local Earth Ground" to the AMPTEC 601ES
DMM chassis ground. All appropriate internal
grounds of the AMPTEC 601ES DMM are con-
nected to the front panel chassis ground jack.
The unit's case ground jack accepts banana jacks,
spade lugs and even bare wires for making an
earth to case ground connection. In other appli-
cations, the AMPTEC 601ES DMM user may
want the meter to be floating from the resistance
under test
and the
case ground jack may be left disconnected or
ignored.
The AMPTEC 601ES DMM has four differ-
ent ranges for measuring AC/DC voltage. The
meter starts at the 600VRMS test level. Should
the user determine there is virtually no measur-
able voltage on the high (600V) range then
select the next lower range (200V).
Rotating the knob to the next (clockwise)
range selects the 200V True RMS AC-DC
Voltage measurement function (200 Volts
fullscale max.). This DC coupled voltage mea-
surement function will therefore display any DC
Voltage - up to 200 V max. This voltage mea-
surement function also measures True RMS AC
Voltage including distorted waveforms (band-
width to 100 Hz). The process of stepping to the
next progressively lower voltage range would
normally continue until the lowest range of 2.0
VDC- AC RMS. The 2.0 V range display
11. AC-DC Voltage VRMS Measurement
STRAY CURRENT
PRESS TO MEASURE
2.0 KOHM
20 OHM
200 OHM
2.0 OHM
20 KOHM
FUNCTION / RANGE
2 AMP
AC/DC
600VRMS
200V
AC/DC
20V
AC/DC
2.0V
AC/DC
+ HIGH
CASE
GROUND
LOW
V
V
LO
V
HI
I
2 Wire
4 Wire
4 wire Kelvin ohms
uses all 4 terminals
+ HIGH
LOW
V
V
LO
V
HI
I
Sect. D - Operation, Functional Self-Test and Use
12
