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ABI Electronics - CircuitMaster 4000M

Precision Active Oscilloscope

 

The CircuitMaster 4000M Precision Active Oscilloscope combines the power of a 100 MHz DSO, 0.1% accurate DC measurement and VI signature capability with unique test techniques (active mode, firmflex) to provide a wealth of circuit diagnostics. Designed to simplify the safe probing of fine pitch PCBs and to reduce the time required to set up, the CircuitMaster 4000M is at the heart of today's technology for all your needs in test and measurement.

 

• Simultaneous DC Voltage/AC Waveform
• DC and AC Function Generator
• V-I Tester with Pulse Outputs
• Drive Strength Checker (FirmFlex)
• 4 Logic Inputs (LogicView)
• 40 Channels Acquisition
• Multi-Function Footswitch
• Automatic Setup (with AIMs)
• Test Sequences (with AIMs)
• Test Sequences (with AIMs)

 

Take Your Testing Capabilities to The Next Level!

 

Standard Mode

In standard mode, the CircuitMaster 4000M behaves like a conventional oscilloscope and retains the standard capabilities of acquisition and measurements. However, the accurate voltmeter (0.1% 24bit) offers a precise reading of the voltage whilst simultaneously displaying the waveform. This removes the need for a separate voltmeter and enables noise or oscillations to be checked. Features such as the footswitch were designed to make probing quicker and safer. Other display options also improve signal analysis.

With two analogue input channels (and external trigger), the CircuitMaster also offers 4 digital inputs with adjustable thresholds for logic signals, making the unit ideal for mixed signals applications. For multiple signal acquisition, a 40 channel connector is located at the front to clip onto ICs or complete PCB connectors. The cable can be split in 2x20 channels for live acquisition and comparison of signals.

 

Active Mode

Active mode is a unique feature of the CircuitMaster 4000M. In this configuration, the unit is able to output DC or AC signals on the same channel it uses to measure an input signal. This duality allows users to detect circuit conditions which are not visible with conventional instruments.
This mode can be used to measure the active response of a test point to a stimulus generated by the CircuitMaster. Alternatively, it can be used as a function generator to inject signals into a board, the second channel being used to monitor the response at a different point in the circuit (phase lag, for instance, will be visible).

Open or Short Circuit
It is a known fact that, on a powered board, a short circuit and an open circuit will both return a voltage measurement of 0V with any voltmeter or oscilloscope. However, with active mode, injecting a small DC signal (eg 3V) into the circuit and measuring the response will give the user a clear indication of the condition. In an open circuit, with the absence of current flow, the voltage output by the CircuitMaster will remain unchanged, thus displaying the same reading as the set voltage. In a short circuit however, the voltage will drop almost completely and the voltage read back by the unit will be close to 0V.
The applications of active mode are endless but some of the common uses include pull up voltages on outputs, voltage regulation checks, threshold voltage measurements and phase shifting.

 

FirmFlex Mode

FirmFlex is another unique test technique used by technicians to assess the strength of a node (its ability to sink or source current in a circuit). In some cases, devices may be functionally working in circuit but lack the strength to drive several other devices on output. This can be caused by aging or minor damages to the device and can be assessed with FirmFlex. This problem also applies to weakened power rails. The CircuitMaster can test and report this effect by altering the background colour from purple for a weak point to yellow for a strong point.
All the features of waveform display, DC measurement, storage and analysis are still available in FirmFlex mode. VI Mode ABI Interface Manager software (AIMs - Optional)

Analogue signature analysis (or VI test) is a technique used to acquire the voltage-current characteristics of devices in unpowered conditions. The resulting curve is typical of a component category or can be, particularly in-circuit, a combination of the four main categories: resistor, capacitor, inductor and semiconductor. The analysis of these characteristics can lead to the detection of faults in components (eg. leaky diode). However, VI is also used as a comparison tool between a known good component and a suspect one. The CircuitMaster offers complete VI capabilities with adjustable test parameters and automatic comparison. Multiple acquisitions, through the MultiWay connector, are also available as well as a 2x20 way live compare option. Scan mode is used to automatically change the applied voltage in a set sequence so that no part of the curve is missed.

This mode of measurement can also be used to test gate-activated devices. The display of the CircuitMaster can be changed to represent the voltage over time (instead of voltage over current) and the separate pulse outputs can be used to trigger the gate of a device. In most cases, the device then becomes activated (shorted) for the duration of the pulse which is represented by the notch in figure. The amplitude, polarity and phase of the pulse can be changed, allowing the user to work out activation thresholds.

 

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