5: Basic Digital Multimeter (DMM) Operation Series 3700 System Switch/Multimeter
-48 Document Number: 3700S-900-
5. If using a switching module, perform the following steps to close the desired channel. Keep
in mind, that for 3 or 4-wire RTD measurements, you will close the primary (INPUT) channel
(1 through 10). The channel that it is paired to will close automatically.
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.
7. To measure other switching channels, repeat steps 5 and 6.
8. When finished, press the OPENALL key to open all channels.
Frequency and period measurements
NOTE Frequency or period measurements as low as 0.5Hz (2 seconds) and < greater than
1MHz (1s) are possible but range dependent.
The Series 3700 is specified for frequency measurements from 3Hz to 500kHz on voltage
ranges of 100mV, 1V, 10V, 100V, and 300V. Period (1 / frequency) measurements can be taken
from 2s to 333ms on the same voltage ranges as the frequency.
Input impedance: 1M || <100pF, AC coupled.
The instrument uses the volts input to measure frequency. The AC voltage range can be
changed with the RANGE ▲ and ▼ keys. The signal voltage must be greater than 10% of the
full-scale range.
CAUTION The voltage limit is subject to the 8• 10
7
VHz product.
Trigger level
Frequency and period use a zero-crossing trigger, meaning that a count is taken when the
frequency crosses the zero level. The Series 3700 uses a reciprocal counting technique to
measure frequency and period. This method generates constant measurement resolution for
any input frequency. The multimeter's AC voltage measurement section performs input signal
conditioning. If the input signal voltage exceeds the selected voltage range, a 000.0000mHz
(0.000000s) will be returned.
Gate time
The gate time is the amount of time the Series 3700 uses to sample frequency or period
readings. Use the RATE key to set the gate time; SLOW sets the gate time to 0.25 sec, MED
sets it to 0.1 sec, and FAST sets it to 0.01 sec. For remote programming, the gate time can be
set from 0.01 to 0.273 sec by setting the dmm.aperture attribute.
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