Specifications
Key functions
Low Pass Filter (LPF)
In alternating current (AC) electric motor
related applications such as the tempera-
ture control system in chiller rooms or con-
veyor drives, the effi ciency of the motor is
very important to reduce operating costs
and improve productivity. Therefore, tech-
nicians need to perform routine servicing
and repairs on the motors and variable-
frequency drive (VFD). The VFD is espe-
cially important as it controls the rotational
speed of the electric motor by regulating
the frequency of the electrical power sup-
plied to the motor.
Sometimes, a maintenance check on the
motor and VFD reveals that the actual
output voltage and frequency from the
VFD differs from the readings on the VFD
display. This shows that the VFD might be
faulty and may therefore need replace-
ment or repair. The difference in voltage
Applications with U1270 Series Handheld Digital Multimeters
U1270 Series – Handheld Digital Multimeters
The U1273AX, the latest addition to the U1270 series is capable of operating down to -40°C in temperature. Even in extremely
cold conditions, the U1273AX handheld DMM delivers immediate and accurate results—no warm-up time required.
readings could also be contributed by
harmonics produced by the output of the
VFD. This problem must be addressed
quickly because if this situation prolongs,
the motor may overheat and eventually
fail, causing downtime.
It is diffi cult to identify the root cause of
this error using a typical wide bandwidth
handheld digital multimeter (DMM).
A handheld multimeter with a built-in
low pass fi lter would help technicians
to quickly determine if the problem is
contributed by unwanted high frequency
components generated by the VFD. The
Agilent U1270 Series handheld DMMs
offer a 1 kHz low pass fi lter to provide
accurate VFD output measurement.
This function eliminates unwanted high
frequency noise signals and components
generated by the VFD. Therefore, a
technician would be able to reduce
troubleshooting time and ultimately
reduce system downtime.
Comparison of voltage output from industrial motor VFD without and with
Low Pass Filter functionality.
• OLED display with 2000:1 contrast ratio and 160 degree viewing angle
1,2
• 30,000 counts resolution
• Measure up to 1000 V AC and DC
• Measure up to 10 A (20 A for 30 s)
• Resistance, diode test, temperature, capacitance
• Low Impedance mode
1,2,3
and Low Pass Filter
• −40 to 55 °C operating temperature
2
• Up to 3000 m operating altitude
• Water and dust resistance (IP 54)
• CAT III 1000 V / CAT IV 600 V safety rating
• Bluetooth wireless connectivity with optional U1177A Bluetooth
All models are ergonomically-built providing useful functions such as Z
LOW
,
which eliminates stray voltages, and Smart Ohm that minimizes false read-
ings from residual voltage induced by leakage current. All of this is designed
into a case that fulfi lls the needs of today's industrial handheld users.
Features
1. U1273A 2. U1273AX 3. U1272A
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