Bedienungsanleitung Keithley 2001 (Seite 52 von 476) (Englisch)

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Front Panel Operation

3-20 2001-900-01 Rev. K/ August 2010

COUPLING

This parameter selects the input coupling for the ACV

function. When AC coupling is selected, a DC blocking

capacitor is placed in series with the input. This removes the

DC component from the RMS, average, or peak ACV

measurement.

When AC+DC coupling is selected, the blocking capacitor is

removed. Subsequent RMS, average, or peak ACV

measurements will reflect both the AC and DC components

of the signal.

While displaying readings, the present coupling setting is

shown on the bottom line, if not showing a multiple display.

You can set the ACV coupling as follows:

1. From the CONFIGURE ACV menu, select COUPLING

and press ENTER. The following menu is displayed:

SET AC COUPLING

AC AC+DC

2. Highlight the desired coupling and press ENTER.

Note that the coupling settings for ACV and ACI are

discrete. Thus, setting the coupling of ACV has no effect on

the coupling of ACI.

AC-TYPE

This parameter selects the measurement type for the ACV

function. The Model 2001 directly measures RMS, average,

and peak AC voltages. For a 330V peak-to-peak sine wave,

which is line voltage in the U.S., the measurements would

be:

•RMS = 117V

• Average = 105V (full wave rectified)

• Peak AC = 165V

The peak detector is also used to measure positive and

negative peak spikes riding on a DC signal and they are,

therefore, also configured from the AC-TYPE menu.

You can program the ACV type parameter as follows:

1. From the CONFIGURE ACV menu, select AC-TYPE

and press ENTER. The following menu is displayed:

SET ACV MEASUREMENT

RMS AVERAGE PEAK LOW-FREQ-RMS

POSITIVE-PEAK NEGATIVE-PEAK

2. Highlight the desired measurement type and press

ENTER.

RMS and LOW-FREQ-RMS: Selecting between normal

RMS mode and low frequency RMS mode depends on the

desired accuracy and speed. Low frequency RMS mode is

more accurate, but slower.

Both modes are specified between 20Hz and 2MHz, with

low frequency RMS specified additionally down to 1Hz.

Some guidelines for choosing between the two modes

follow:

• Below 50Hz, use low frequency RMS mode for its

greater accuracy.

• Between 50 and 100Hz, use either mode.

• Above 100Hz, use normal RMS mode for its greater

speed.

AVERAGE: When this item is selected, the signal path in

the instrument bypasses the RMS converter, so the average

ACV measurement is just the filtered output of a full wave

rectifier.

PEAK: For AC peak measurements, the instrument displays

the largest peak (positive or negative) of the input signal. The

measurement window is fixed at 100msec.

Note that you can configure the resolution of ACV peak

measurements from 4 digits (3.5d from SET ACV

RESOLUTION menu) to 8 digits (7.5d), but the accuracy is

specified at 4 digits. In addition, the accuracy Specifications

for AC peak measurements assume AC+DC coupling below

200Hz.

POSITIVE-PEAK and NEGATIVE-PEAK: Peak spike

measurements are available as an ACV primary display (top

line). They are also available as a DCV multiple display

(bottom line). The menu items POSITIVE-PEAK and

NEGATIVE-PEAK enable the measurement as a primary

display. See Figure 3-8 for a description of the primary

display.

After selecting a positive or negative peak spikes

measurement from the SET ACV MEASUREMENT menu,

you are asked to enter a value for the measurement window.

A typical message follows:

PEAK WINDOW = 0.1 s

This sets the time the signal is sampled before the display is

updated with a new reading. It can range from 0.1sec to

9.9sec.

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