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190 Series III
Users Manual
10
Input Connections
The top of the test tool has four safety BNC signal inputs (models 190–xx4/MDA-550) or two
safety BNC jack inputs and two safety 4-mm banana jack inputs (models 190-xx2). These
isolated inputs allow independent floating measurements with each input. The banana jack inputs
(190-xx2) can be used for DMM measurements or can be used as External Trigger input for the
Scope mode. See Figure 3.
Figure 3. Measurement Connections
Note
To maximize the benefit of independent isolated floating inputs and to avoid problems
caused by improper use, see Tips.
For an accurate indication of the measured signal, you must match the probe to the input
channel on the test tool.
When using probes that are not included with the Product, see Voltage Probe Calibration.
Scope
To make scope measurements:
1. Connect the red voltage probe to input A, the blue voltage probe to input B, the gray voltage
probe to input C, and the green voltage probe to input D.
2. Connect the short ground leads of each voltage probe to its own reference potential. See
Figure 4.
ALL INPUTS ISOLATED
!
ALL INPUTS ISOLATED
!
16


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