Fluke 5500A - Entering a DC Offset

5500A
Operator Manual
4-46
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 G to clear the display, then reenter the value. This procedure assumes you
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).
OFFSET
WAVE
+0.00000 V
sine
1. Press the softkey WAVE to select the desired waveform: sinewaves (sine),
trianglewaves (tri), squarewaves (square) or truncated sinewave (truncs).
2. Press the softkey OFFSET, opening the offset entry display. Enter the desired offset
using the numeric keys and decimal point key. For example, 0.123 V (below).
Offset = +0.0000 V
New offset = 0.123 V
3. Press the E key to enter the offset and then P.