Operator`s manual

Signametrics 38
Add e testing high value resistive elements such as cables, transformers, and other leaky itional applications includ
objects such as printed circuit boards, connectors and semiconductors.
Range Measurement range Resolution Voltage Range Current Limit
400kΩ 1kΩ to 100MΩ 10Ω
±0.02V to ±10.0V 25µA
4MΩ 10kΩ to 1GΩ 100Ω
±0.02V to ±10.0V 2.5µA
40MΩ 100kΩ to 10GΩ 1kΩ
±0.02V to ±10.0V 250nA
Figure 4-7. Gua g rove ccurac suring high valu stors using the Extended
mea rem t met d.
.6 Eff ts f Th rmo- ffset
ents are sen e to T aic (Thermal EMF) . These error voltages can be
oor te leads, relay c acts and s in the measure ath. They affect all measurement
ding 2-W 4-Wi 6-Wire guarded 2-Wire o To quantify this error, consider a
hich s als route the D y multiplexing sy Many vendors of switching
de Thermal F spec it is not uncommo ind relays that have more than 50
al ay c acts i e path, n be significant. This error can be measured using the
0mV DC range. To do t is, clos lay that is not conn ad, wait for a short time
inutes), t an m sure t voltage orted relay contac to short the DMM leads
tive’ lear MM offset p asurement. To cal error, count all relay
ich a n se with measu +, V, Ω- terminal terminals in 4-
). Mul y th ount the The Use Ohms l voltage to resistance
e fol ing le.
e Me ure ent E rors d -Voltaic off
Ohm
Current
MM
esoluti
E
10
rror due to
00 µV EMF
rdin imp
n
s a y when mea e resi
Resistance su e ho
4.3 ec o e Voltaic O
Resistance measurem sitiv hermo-Volt errors
caused by p st ont
,
other element ment p
methods, inclu ire, re and 3-Wire ( hms).
system in w ign are d to MM via a rela
d
stem.
products do not provi
sever
EM ification, an n to f
µV. With rel ont n th
h
the error ca
SM2060 24 e a single re ected to any lo
(about 2 m h ea
he D
he across the sh ts. Make sure
and set ‘rela
wh
to c
i
t rior to the me culate worst-case
contacts, re ries
c
the rement (V, Ω s in 2-Wire, and I+, I-
hisWire mode
th
tipl
w
is by rmal EMF voltage. aw to convert t
error as in lo tab
Resistanc as m r ue to Thermo sets.
SM2066
ge Ran
s D
R on
rror due to E
µV EMF 1
Error due to
1mV EMF
33 Ω
10 m
µΩ 1 0 mΩ
A
10 mΩ 1 100 mΩ
330 Ω
1 m
0 µΩ 10 00 mΩ
A
10 mΩ 1 1 Ω
3.3 kΩ
1 m
mΩ 10 00 mΩ
A
1 mΩ 1 1 Ω
33 kΩ
100 uA
mΩ 10 Ω 10 10 0 mΩ 1 Ω
330 kΩ
10 uA
0 mΩ 1 0 Ω 100 10 Ω 1 Ω