Entering A Dc Offset - Fluke 5500A Operator's Manual

5500A
Operator Manual

4-43. Entering a DC Offset

When the calibrator single output is an ac voltage of sinewaves, trianglewaves,
squarewaves or truncated sinewaves, you can apply a +dc offset. When applying an
offset to squarewave outputs, the duty cycle must be 50.00% (default). The offset
selection is entered using the softkey OFFSET, which appears when the ac voltage
output is less than 33 V (sinewaves), 66 V peak-to-peak (squarewaves) or 93 V peak-to-
peak (trianglewaves and truncated sinewaves). The softkey OFFSET will not appear and
offsets may not be entered when the output is a voltage sinewave measured in dBm.
The maximum offset value allowed depends on the maximum offset and maximum peak
signal for each range. For example, a squarewave output of 10 V peak-to-peak is within
the range 6.6 to 65.9999 V peak-to-peak, a range that allows a maximum peak signal of
55 V. For this example, the squarewave peak value is 5 V, thus allowing a maximum
+offset of 50 V for a maximum peak signal of 55 V.
Check the specifications in Chapter 1 for offset limits. If you are using an offset voltage
and you cause the output to move into a range where offset is not allowed (for example,
above 33 V for a sinewave output), the calibrator will go into the standby mode and the
offset function will be disabled.
Complete the following procedure to enter a dc voltage offset. If you make an entry
error, press
have already sourced a single ac voltage output not exceeding 33 V (sinewaves), 65 V
peak-to-peak (squarewaves) or 93 V peak-to-peak (trianglewaves and truncated
sinewaves), thus displaying the softkey OFFSET (below).
1. Press the softkey WAVE to select the desired waveform: sinewaves (sine),
2. Press the softkey OFFSET, opening the offset entry display. Enter the desired offset
3. Press the
4-46
to clear the display, then reenter the value. This procedure assumes you
trianglewaves (tri), squarewaves (square) or truncated sinewave (truncs).
using the numeric keys and decimal point key. For example, 0.123 V (below).
key to enter the offset and then .