B+K precision 5490C Series, Руководство пользователя

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3.3.2 DCV Ratio
The DCV Ratio measurement function takes the ratio between two DC voltage measurements. The
ratio is calculated by dividing the input voltage (DCV1) by a reference voltage (DCV2), refer to Figure
3.2.2 – DCV Ratio below.
Step 1: Properly connect the input terminals as shown:
Figure 3.2.2 – DCV Ratio
Step 2: Turn on the DCV Ratio function. In DCV mode, enable DCV Ratio by pressing the softkey.
3.3.3 AC Voltage
This section describes how to configure the 5490C Series for AC voltage measurements. In order to get
the most accurate measurement, the corresponding RC time constant must be stable to 1/50 of the
input AC signal level.
Signals greater than 300 V (RMS) or 1 A (RMS) can cause self-heating of the signal conditioning
components. These errors are included in the instrument's specifications. Internal temperature
changes caused by self-heating may cause additional errors in other functions or ranges. Additional
errors typically disappear within a few minutes. Example: Consider a 100 VAC signal with a 5 VDC bias
voltage as an example, the 5 VDC bias voltage should be stable at 1/50 of 100 VAC or 2 VDC.