Front Panel Operation
Setting the Output
4
4-23
nn076f.eps
• DUTY (Duty Cycle) When the square wave is selected, DUTY appears, allowing
you to modify the duty cycle of the square wave. The range is 1.00 to 99.00%. The
default is 50.00%. The duty cycle must be 50.00% if you want to enter an OFFSET
(see below).
• OFFSET (Voltage Offset) appears when the desired output is less than 33 V (sine
waves), 65 V (square waves) or 93 V (triangle waves and truncated sine waves). This
softkey allows you to add a positive or negative dc offset voltage to the ac output
signal. See “Entering a DC Offset” later in this chapter for more information. When
a voltage output is expressed in dBm, voltage offset is not available. You can enter
an offset for a square wave output only when the duty cycle is 50.00% (see DUTY
above).
• φ & REF MENUS (Phase Difference and 10 MHz reference source.) Selects the
phase difference between the NORMAL and AUX outputs, selects internal or
external 10 MHz reference, and sets the phase difference between an external master
5520A (using 10 MHz IN/OUT) and the NORMAL output. See “Adjusting the
Phase” and “Synchronizing the Calibrator using 10 MHz IN/OUT” later in this
chapter.
• WAVE (Waveform) allows you to select one of four different types of waveforms:
sine wave, triangle wave, square wave, and truncated sine wave. (See “Waveform
Types” later in this chapter for more information). Whenever a non-sinusoidal
waveform is selected, the Output Display shows Pp (p-p). Only sine wave is allowed
for output in dBm.
4-24. Setting DC Current Output
Complete the following procedure to set a dc current output between AUX HI and LO or
AUX 20A and LO, depending on the current level selected. Current greater than ±3 A is
sourced between the AUX 20A and LO terminals. If you make an entry error, press
Gto clear the display, then reenter the value.
Note
See Figure 1-4 in Chapter 1 for a chart that shows duration or duty cycle
limitations for current greater than 11 A. If the duration or duty cycle is
exceeded, the 5520A will shut down abruptly. After a cool-off period, the
5520A will work normally.
1. Press R to clear any output from the calibrator.
2. Connect the UUT as described earlier in this chapter under “Connecting the
Calibrator to a UUT.”
3. Set the UUT to measure dc current on the desired range.
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