How To Measure Dc/Ac Voltage - HP HP34401A User Manual

T A K I N G M E A S U R E M E N T S
How to Measure DC and AC
Voltage
To measure a voltage, connect the probes to the HI and LO input terminals of the DMM. In
order to activate the DMM for voltage measurements, select either the AC V or DC V button
on the front panel (Figure 2).
DISPLAY
FUNCTION
DC I AC I 4W
DC V AC V 2W
Select DC V or AC V
Figure 2. How to Measure Voltage
Next, connect the leads of the probes to
the circuit in parallel with the location of
the voltage in question (Figure 3). The
Hi lead connects to the "+" (pos) part of
the circuit and the Lo to the "–" (neg). If
these are reversed, a negative value for the
voltage is obtained.
CAUTION:
never apply a voltage over the current input terminal (I) of the DMM.
MATH
Period
dB
Freq Cont Null
Circuit under Test
Figure 3. Probe/Meter placement
on the circuit to Measure Voltage
Do not exceed the maximum allowable voltage input (1000V DC). Also,
3
2
Section
4W Sense
V
HI HI
AC or Dc Voltage
LO LO
dBm
Min/Max
I
Shift
Hi
+
V
V
-
Lo
Across Resistor R
+
-
DMM