5: Basic Digital Multimeter (DMM) Operation Series 3700 System Switch/Multimeter
-20 Document Number: 3700S-900-01 Rev. A
Standard resistance measurements
CAUTION Inputs: Do not apply more than 425V peak between INPUT HI and LO, or
instrument damage may occur.
CAUTION Switching cards: Do not apply more than 300V DC or 300V RMS (425V peak)
for AC waveforms between any two pins, or switching module damage may
occur.
For example, if INPUT Channel 1 HI is 300VDC from Channel 1 LO, Channel 1
LO must be 0VDC from chassis ground.
Perform the following steps to measure resistance:
1. Press the OPENALL key to open all switching channels.
2. Select the ohms measurement function by pressing the FUNC key until 2W or 4W (as
applicable) is displayed.
3. Use the RANGE ▲ and ▼ keys to select a measurement range consistent with the
expected resistance, or press the AUTO key to select autoranging (AUTO annunciator turns
on).
4. Connect the resistance(s) to be measured.
5. If using a switching module, perform the following steps to close the desired channel:
a) Use the wheel to dial in the channel number.
b) Press the CLOSE key.
6. Press the TRIG key and observe the displayed reading. If the “Overflow” message is
displayed, select a higher range until a normal reading is displayed (or press the AUTO key
for autoranging). For manual ranging, use the lowest possible range for the best resolution.
7. To measure other switching channels, repeat steps 5 and 6.
8. When finished, press the OPENALL key to open all channels.
Offset-compensated ohms
The presence of thermal EMFs (V
EMF
) can adversely affect low-resistance measurement
accuracy. To overcome these unwanted offset voltages, you can use offset-compensated ohms
(OCOMP). Offset-compensated ohms measurements can be performed on the 1, 10, 100,
1k, and 10k ranges for the 4 function. It cannot be done on the 2 function.
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