3
RS-925D
3
Specifications
RS925D OpERa
TInG GUIDE
consuL
T insTr
ucTion mAnu
AL For Pr
oPEr insTr
umEnT oPErA
Tion
MODEL:
RS925D
Sn:
D5-2307704
rs-925d label.indd/01-18-2013
W
aRnInG
obser
ve
all
saf
ety
r
ules
when
w
or
king
with
high
voltages
or
line
voltages
. connect
the
(Gnd)
ter
minal
to
ear
th
ground
in
order
to
maintain
the
case
at
a
saf
e
voltage
. Whene
ver
hazardous
voltages
(>45
V)
are
used,
tak
e
all
measures
to
av
oid
accidental
contact
with
an
y
liv
e
components:
a)
use
maxim
um
in-
sulation and minimiz
e the use of bare conductors
. b) remo
ve po
w
er when adjusting s
witches
. c) P
ost w
ar
ning signs and k
eep personnel saf
ely a
w
ay
.
IET LABS, INC.
www
.ietlabs.com
cA
GE codE:
62015
• Email:
inf
o@ietlabs
.com •
Tel:
(516) 334-5959 • 800-899-8438
• F
ax:
(516) 334-5988
Accuracy
±(20 ppm+0.5 mΩ) At 23°C "true ohm" measurement, 30-70% RH, absolute reading, case grounded, SI traceable No zero subtraction required
Minimum resistance:
10 mΩ ± 0.5 mΩ
; determined by the lowest settable
position, “1”, of the 10 mΩ
/step decade
Resistance repeatability:
Better than 100 µΩ, short-term, average value
Environmental Conditions:
Operating T
emperature:
0°C to 55°C
Storage T
emperature:
-40°C to 70°C
Switch T
ype:
Multiple solid silver contacts; dust-tight diallyl- phthalate body
.
To allow continuous rotation, a blank position is added on most decades.
Resistance
per step
Total
decade
resistance
Max
current
Max
po
wer
Temperature
coeffi
cient
(±ppm/ºC)
p
o
wer
coeffi
cient
(±ppm/mW)
Stability
(±ppm/yr)
Decade positions
Resistor type
whic
he
ver applies fi
r
st
100 µ
Ω
division
20 µ
Ω
resolution
10 mΩ
2
A
NA
20
1
20 ppm+0.5 mΩ
Continuous
Rheostat
1 m
Ω
10 mΩ
2
A
NA
20
1
11 positions "0"-"10"
Resistance wire
10 m
Ω
100 mΩ
2
A
NA
20
1
10 positions "1"-"10"
(10 mΩ
minimum reading
100 m
Ω
1 Ω
2
A
NA
20
1
11 positions "0"-"10"
1
Ω
10 Ω
1
A
5 W
20
0.4
Wirewound hermetically sealed low-inductance
10
Ω
100 Ω
0.33
A
5 W
10
0.3
100
Ω
1 kΩ
0.1
A
5 W
3
0.1
1 k
Ω
10 kΩ
33 mA
5 W
3
0.1
10 ppm
(<5 ppm typical)
10 k
Ω
100 kΩ
10 mA
5 W
3
0.1
100 k
Ω
1 MΩ
3 mA
2,000 V peak
3
0.1
12 positions "0"-"1
1"
Wiring and s
witc
h resistance
NA
50 µΩ/ºC
0.2 µΩ/W
NA
For Best Performance:
Whenever the unit has been idle, turn each switch 7-10 times both ways before using.
This switch "break-in"
procedure is standard metrology practice required for best accuracy to remove any silver oxide fi
lm on the
contact surfaces, typically <1 mΩ.
Terminals:
Four
, 5-way
, gold-plated, tellurium-copper
binding posts with low thermal emf and low resistance, for four-terminal Kelvin measurements, plus one binding post connected to case for shielding. Rear outputs are available as an option.
RS925D OpERa
TInG GUIDE
consuL
T insTr
ucTion mAnu
AL For Pr
oPEr insTr
umEnT oPErA
Tion
MODEL:
RS925D
Sn:
D5-1645634
rs-925d label.indd/01-18-2013
W
aRnInG
obser
ve
all
saf
ety
r
ules
when
w
or
king
with
high
voltages
or
line
voltages
. connect
the
(Gnd)
ter
minal
to
ear
th
ground
in
order
to
maintain
the
case
at
a
saf
e
voltage
. Whene
ver
hazardous
voltages
(>45
V)
are
used,
tak
e
all
measures
to
av
oid
accidental
contact
with
an
y
liv
e
components:
a)
use
maxim
um
insulation
and
minimiz
e
the
use
of
bare
conductors
.
b)
remo
ve
po
w
er
when
adjusting
switches
.
c)
P
ost
w
ar
ning
signs
and
keep
personnel
saf
ely
aw
ay
.
IET LABS, INC.
www
.ietlabs.com
cA
GE codE:
62015
• Email:
inf
o@ietlabs
.com •
Tel:
(516) 334-5959 • 800-899-8438
• F
ax:
(516) 334-5988
Accuracy
±(20 ppm+0.5 mΩ) At 23°C "true ohm" measurement, 30-70% RH, absolute reading, case grounded, SI traceable No zero subtraction required
Minimum resistance:
10 mΩ ± 0.5 mΩ
; determined by the lowest settable
position, “1”, of the 10 mΩ
/step decade
Resistance repeatability:
Better than 100 µΩ, short-term, average value
Environmental Conditions:
Operating T
emperature:
0°C to 55°C
Storage T
emperature:
-40°C to 70°C
Switch T
ype:
Multiple solid silver contacts; dust-tight diallyl- phthalate body
.
To allow continuous rotation, a blank position is added on most decades.
Resistance
per step
Total
decade
resistance
Max
current
Max
po
wer
Temperature
coeffi
cient
(±ppm/ºC)
p
o
wer
coeffi
cient
(±ppm/mW)
Stability
(±ppm/yr)
Decade positions
Resistor type
whic
he
ver applies fi
r
st
100 µ
Ω
division
20 µ
Ω
resolution
10 mΩ
2
A
NA
20
1
20 ppm+0.5 mΩ
Continuous
Rheostat
1 m
Ω
10 mΩ
2
A
NA
20
1
11 positions "0"-"10"
Resistance wire
10 m
Ω
100 mΩ
2
A
NA
20
1
10 positions "1"-"10"
(10 mΩ
minimum reading
100 m
Ω
1 Ω
2
A
NA
20
1
11 positions "0"-"10"
1
Ω
10 Ω
1
A
5 W
20
0.4
Wirewound hermetically sealed low-inductance
10
Ω
100 Ω
0.33
A
5 W
10
0.3
100
Ω
1 kΩ
0.1
A
5 W
3
0.1
1 k
Ω
10 kΩ
33 mA
5 W
3
0.1
10 ppm
(<5 ppm typical)
10 k
Ω
100 kΩ
10 mA
5 W
3
0.1
100 k
Ω
1 MΩ
3 mA
2,000 V peak
3
0.1
12 positions "0"-"1
1"
Wiring and s
witc
h resistance
NA
50 µΩ/ºC
0.2 µΩ/W
NA
For Best Performance:
Whenever the unit has been idle, turn each switch 7-10 times both ways before using.
This switch "break-in"
procedure is standard metrology practice required for best accuracy to remove any silver oxide fi
lm on the
contact surfaces, typically <1 mΩ.
Terminals:
Four
, 5-way
, gold-plated, tellurium-copper
binding posts with low thermal emf and low resistance, for four-terminal Kelvin measurements, plus one binding post connected to case for shielding. Rear outputs are available as an option.
Figure 2-1:
T
ypical Operating Guide Affix
ed to Unit
