User`s guide

Making Measurements 2
Using Smart Ω for Resistance Measurements
U1273A/U1273AX User’s Guide 57
Using Smart Ω for Resistance Measurements
To use the Smart Ω function, set up your multimeter to test
for resistance as shown in Figure 2- 17. Probe the test
points, and read the display.
The resistance measurement and the bias voltage
measurement is shown in the primary and secondary
displays respectively.
Press to switch between the leakage current (LEAk) or
bias voltage (BiAS) display.
Table 2- 1 1 Rotary switch position allowing Smart Ω measurements
Legend Default function Function when is pressed
Resistance
measurement (Ω)
Cycles between
• Continuity test ( ),
• Smart Ω measurement, or
• Resistance measurement (Ω)
S
h
i
f
t
V
i
e
w
E
s
c
Smart
NOTE
• Smart Ω (offset compensation) removes unexpected DC voltages
within the instrument, at the input or at the circuit being measured,
which will add to resistance measurement errors. The bias voltage or
leakage current is shown on the secondary display.
• Using the offset compensation method, the multimeter takes the
difference between two resistance measurements when two different
test currents are applied to determine if there are any offset voltages in
the input circuitry. The resultant displayed measurement corrects this
offset, giving a more accurate resistance measurement.
Exit
Dual
NOTE
• The Smart Ω is applicable for the 30 Ω, 300 Ω, 3 kΩ, 30 kΩ, and 300 kΩ
resistance range only. The maximum correctable offset/bias voltage is
+50 mV/–30 mV for the 30 Ω range and +1.0 V/–0.2 V for the 300 Ω,
3 kΩ, 30 kΩ, and 300 kΩ ranges.
• If the DC voltage on the resistor is over the maximum correctable
offset/bias voltage, OL is shown on the secondary display.