User Manual

GMC-I Messtechnik GmbH 39
Measurements: V/Hz/dB – PQ/ – MHz/% – Ω/nS/R
SL
– / – Temp – /m – W/Wh – A/Hz/thd
5.2 Resistance, Conductivity and Low-Resistance Measurement
Ð Disconnect supply power from the electrical circuit of the de-
vice to be measured, and discharge all high-voltage capaci-
tors.
Ð Make sure that the device under test is voltage-free.
Interference voltages distort measurement results!
Refer to section 5.1.1 regarding testing for the absence of volt-
age with the help of the direct voltage measurement.
Ð Set the rotary switch to “Ω” or “nS”.
Ð Connect the device under test as shown.
Note
Use short or shielded measurement cables in the case of
high-impedance resistance.
Ω and R
PE
: “0 L” appears at the display in the case of an open con-
nection.
nS: “u r” (under range) appears at the display in the case of an
open connection.
Improving Accuracy for Resistance and Low-Resistance Measurement by
means of Zero Balancing
Cable resistance and contact resistance can be eliminated in all
measuring ranges by means of zero balancing (see section 4.2)
(applies to Ω and R
PE
functions only).
COM
V
Tem p
Ω
R
x
R
x
0V !
!
Ω
Ω: 600 Ω … 60 MΩ
Measuring ranges:
nS
Ω
nS
FUNC
ENTER
FUNC
ENTER
FUNC
ENTER
000 . 00
050 . 0
S
30 . 00
rpe
Ω
n
R
SL
Ω
nS: 15 – 600 nS
R
PE
: 60 Ω
R
PE
> 0.1 ... 60.9 Ω , OL