Rohde & Schwarz UPD, Application Note

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1GA16_1L.DOC ROHDE & SCHWARZ 35
6.1.2 Running a Macro
A macro is started by one of the START softkeys in the macro menu.
•
VIEW RUN starts the macro and waits for a (predefined or explicit) macro name to be entered. The
sequence is then performed as in manual operation using softkeys.
•
FAST RUN has the same function as VIEW RUN with the exception that no softkey labels are
displayed. This speeds up the execution of the macro.
•
RE-RUN restarts the last macro without the macro name having to be entered. The selected mode
(VIEW or FAST, possibly also "single step", see below) remains unchanged.
The user may switch on and off the single step mode for running a macro by specifying STEP MOD. A
macro started in the single step mode expects a character to be entered after each read and executed
softkey. This mode is used to check the macro function.
Macro operation is signalled by the message MACRO RUN. If a "DUT failed" occurs, the macro stops and
waits for a keystroke. If a general error occurs the macro is aborted.
6.1.3 Predefined Macros
The six softkeys MACRO #0 (F6) to MACRO #5 (F11) are assigned the following functions:
MACRO #0: Go/Nogo test: Entry and automatic setting of output power (into 4
Ω
), frequency response
measurement of a reference loudspeaker by means of a sinewave sweep with display of sound
pressure characteristic (in dBspl) and output power (in W), storing the sound pressure characteristic
of the reference loudspeaker, switchover from UNIT to REF SPK with entry of upper and lower
limit value, measurement of a test loudspeaker and check for compliance with tolerances, printout,
termination of the macro.
MACRO #1: Frequency response measurement by means of FFT noise with automatic setting of a 1-W
output power (into 4
Ω
) and determining the sensitivity in the frequency band from
500 Hz to 1.5 kHz.
MACRO #2: Frequency response measurement by means of a burst sweep. A near-field measurement is
optional.
MACRO #3: Sweep of THD measurement (d2 to d9) with trace display.
MACRO #4: Sweep of THD+N measurement with display of post-FFT for each test point.
MACRO #5: Phase measurement between amplifier output and microphone input, printout, phase
response measurement by means of sinewave sweep, display of absolute phase, linearity
departure and group delay.
A 7th macro for an impedance measurement with analysis can be started by pressing the USER MAC
softkey and entering the file name SPEAKER6.MAC:
•
Display of impedance characteristic with computation of Thiele-Small parameters of a "golden unit"
and storing the characteristic as a reference trace.
•
Measurement of an additional loudspeaker and display of deviations from the reference loudspeaker.
•
Measurement of an additional loudspeaker and display of impedance characteristic and deviation from
the reference loudspeaker. This measurement is printed out.
•
Switchover to the FFT noise mode, display of impedance characteristic and computation of Thiele-
Small parameters.
•
Termination of the macro.
Each of these macros first loads the associated configuration file (SPEAKERx.CFG, x=0..6, see 6.2).
Exception: SPEAKER6.MAC calls up USER CFG permitting the entry of different configuration file
names. At the end of each measurement the result is printed out if a configured printer is connected. (In
the default state printout is to the PCX file SPEAKER.PCX).