04 | Keysight | 34980A Multifunction Switch/Measure Unit - Data Sheet
Measurements you can trust
Get proven performance from Keysight instruments, with the resolution, repeatability,
speed, and accuracy you’ve come to expect.
The 34980A offers built-in signal conditioning and modular ꢀexibility. When you use it
with the internal DMM, you can conꢁgure each channel independently for the measure-
ments you choose. It includes a variety of features that give you conꢁdence in your
measurements:
– 6½ digits of resolution with .004% of accuracy with DC voltage measurements
– Alarms per channel—high limit, low limit, or both
– Math functions—use Mx+B for custom linear conversions and converting raw inputs
– Built-in thermocouple reference for temperature measurements (34921T)
– Time-stamped readings
– Add more formulas with BenchLink Data Logger Software
The integrated DMM is mounted inside the mainframe and does not consume any of
the eight user-available slots. You can access the DMM through any switch module that
connects to the analog bus, or directly from the analog bus connector on the rear of the
mainframe. The internal DMM gives you the ꢀexibility to measure 11 types of inputs:
– Temperature with thermocouples, RTDs, or thermistors (with 34921A)
– DC and AC voltage
– 2- and 4-wire resistance
– Frequency and period
– DC and AC current
You can control the DMM directly, or conꢁgure it to work in conjunction with the
switches. Each switch channel can be conꢁgured independently for measurement
functions, scale factors and alarm limits. Advanced measurement features such as
offset compensation, variable integration time, and delay are also selectable on a
per-channel basis.
The DMM inputs are shielded and optically isolated from the 34980A’s earth-referenced
circuitry and computer interface, and as a result, you get up to 300 V of input isolation.
This is important for reducing ground-loops and common-mode voltage errors
associated with long wiring runs and ꢀoating sources.
Simple DMM calibration is accomplished with just the analog bus connection on the
rear panel of the mainframe. You don’t need to remove the mainframe from the rack or
dedicate a channel for calibration.
Modules provide ꢀexible system stimulus and control
System control—with analog outputs, open-collector digital outputs, clock genera-
tion, and isolated Form-C relays for controlling external devices. Additionally, with the
microwave switch/attenuator driver, high-frequency switches and attenuators can be
efꢁciently controlled external to the 34980A mainframe.
Analog sources—output either voltage or current. You can conꢁgure the 4-channel
isolated D/A converter as a point-to-point arbitrary waveform generator that lets you
deꢁne up to 500,000 points per waveform.
Digital patterns—send or receive digital data from your device under test. With onboard
memory you can output communication protocols and bit streams or monitor digital
input patterns and interrupt when a user-deꢁned pattern is detected.
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