Keithley 3700A Series Reference Manual

Section 8: Theory of operation Series 3700A System Switch/Multimeter Reference Manual
8-4 3700AS-901-01 Rev. D/June 2018
Figure 104: 1plc Line Sychronization Block Diagram
For Line Synchronization off and <1 PLC, reading rate increases, but measurement uncertainty and
noise increases due to the Average AC noise during the S HI phase not canceling with the S LO
phase. With line synchronization ON, the S HI and S LO measurement phases are triggered at the
rising edge of the power line zero crossing. This improves reading uncertainty and noise by >30×
while minimal reading rate reduction.
Figure 105: Line Sync Off and On <1plc

Keithley 3700A Series Specifications

General

Model	3700A Series
Category	Multimeter
Measurement Functions	DC Voltage, AC Voltage, DC Current, AC Current, Temperature, Capacitance
DC Voltage Accuracy	±0.0035% of reading
Temperature Measurement	Thermocouple, RTD, Thermistor
Temperature Range	Varies with sensor type
Frequency Range	3 Hz to 500 kHz
Capacitance Range	10 pF to 100 µF
Interface	LAN, USB, GPIB
Power Supply	100 V to 240 V, 50 Hz to 60 Hz