The TPI 440 is a handheld electrical test device that combines a 1MHz, single-channel digital oscilloscope for viewing low-bandwidth electrical signals with a true RMS digital multimeter for measuring AC voltage to 750V, DC voltage to 1,000V, AC and DC current to 10 amp, resistance to 30MΩ, capacitance to 400μF, and frequency to 2MHz. The oscilloscope has a maximum real-time sample rate of 20MS/s and record length of 256 pixels for viewing industrial power signals such as motor controls, UPS, switching power supplies, and PLC controls. Spikes in signals can be found with the glitch capture trigger. The 4,000-count, true RMS (root mean square) multimeter provides accurate readings when measuring linear or non-linear loads, regardless of waveform. It has two ranging modes: manual, which allows the user to select the operating range, and auto, which automatically selects the appropriate operating range. The relative function allows a measurement to be set as a reference value and displays subsequent measurements as a positive or negative deviation from that value, and the record function captures maximum, minimum, and average values for parameter. A continuity buzzer confirms that the circuit conducts electricity, and a diode check detects whether a circuit’s diodes are working properly. The unit’s component test checks voltage-current signatures on resistors, capacitors, and semiconductors, its logic test indicates transitions up to 2 MHz, and its frequency counter measures low-frequency signals from 1Hz to 2MHz, displaying duty cycle, pulse width, and period. Additional specifications include a sweep speed of 1μs to 1s and various triggering features. The unit has a 3″ x 3″ LCD with a resolution of 160 x 240 pixels that can simultaneously show a waveform and a reading, and has a backlight for visibility in low light. A multimeter is an electrical testing tool for measuring multiple properties of an electrical circuit to verify proper operation or diagnose problems.
The unit operates on a rechargeable NiCad battery pack or a charger/adapter (both included). A low battery indicator signals when the battery pack needs recharging. The unit has an RS-232 output for transferring data to a compatible PC during measurement (serial cable sold separately). It meets IEC (International Electrotechnical Commission) safety standard 1010 and is rated for CAT (category) III installations to 600V, which covers equipment in fixed installations, such as switches in the fixed installation and some industrial equipment that is permanently connected to the fixed installation and CAT II installations to 1,000V, which covers energy-consuming equipment connected to a fixed installation, including household, office, and laboratory appliances. It has European Conformity (CE) marking. It comes with a set of insulated test leads with alligator clips, a rechargeable NiCad battery pack, a charger/adapter, and a user manual.
|Display||3″ x 3″ LCD|
|Maximum real-time sample rate||20MS/s|
|Record length||256 pixels|
|Maximum DC voltage measured||1,000V|
|Maximum AC voltage measured||750V|
|Maximum AC and DC current measured||10 amp|
|Maximum resistance measured||30MΩ|
|Maximum capacitance measured||400μF|
|Maximum frequency measured||2MHz|
H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.
Oscilloscopes are electrical testing devices used to verify the functionality of equipment that generates an electrical signal. Oscilloscopes measure the voltage of an electrical signal over time, and display the measurement as a waveform in a visual graph. The waveform shows the sweeps (or refresh) of voltage on a vertical (Y) axis, and the time on a horizontal (X) axis. Details of a waveform demonstrate the signal over time. Most oscilloscopes have two or four channels for inputting a signal. Some digital oscilloscopes offer more than four channels, allowing channels to be dedicated to specific signals and applications. Bandwidth is the maximum frequency of a signal that an oscilloscope can capture. A constant image will display if a signal is shown at a high frequency. Oscilloscopes may be analog, digital, or mixed signal. An analog oscilloscope directly displays an input signal as a continuous waveform, typically in a luminous phosphor on a cathode ray tube (CRT). A digital oscilloscope converts the input signal into a digital format and reassembles the waveform for display, typically on an LCD. A mixed signal oscilloscope (MSO) displays both analog and digital formats. Some oscilloscopes can display more than one channel and type of measurement simultaneously. Some oscilloscopes can capture waveform signals to memory, and recall them. They may provide real-time intensity grading, and may have the ability to adjust frequency of display. Oscilloscopes can be powered with batteries or electricity, or may have a built-in generator. They are commonly used for testing, measuring, and inspecting in science, engineering, telecommunications, automotive, and electronics applications.
Test Products International (TPI) manufactures test and measurement equipment such as oscilloscopes, manometers, multimeters, and test leads. The company, founded in 1997, is headquartered in Beaverton, OR.
What’s in the Box?
- TPI 440 digital oscilloscope and multimeter
- Set of insulated test leads with alligator clips
- 7.2V rechargeable NiCad battery pack
- User manual
1 MHz Oscilloscope: View industrial power signals such as motor controls, switching power supplies, and PLC controls with detail and clarity.
Trend Mode: Graph readings over a predetermined time period to check for surges or dropouts.
Component Test: Check voltage-current signatures on resistors, capacitors, and semiconductors.
Logic Test: Indicates transitions up to 2 MHz.
Frequency Counter: Measure low frequency signals from 1Hz to 2 MHz and display duty cycle, pulse width and period.