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Model 6220/6221 Reference Manual
Performance Verification
16-9
Return to
Waveform function accuracy
The following tests apply only to the Model 6221.
Amplitude flatness
1.
With the power off, connect the DMM to the Model 6221 OUTPUT jack, as
shown in
. Also connect the shorting connector to the INTER-
LOCK connector (see Section 2 for interlock connections).
2.
Turn on the Model 6221 and test equipment, and allow them to warm up for
one hour before proceeding. Select the AC current function on the DMM,
and enable auto range.
3.
Select the Model 6221 sine wave function by pressing the WAVE key.
4.
Set the Model 6221 amplitude (AMPL) and frequency (FREQ) to 100mA at
1kHz, and turn on the output.
5.
Note the DMM reading at 1kHz. If your DMM has a dB reference function,
set the present reading to 0dB.
6.
Set the Model 6221 frequency to 100kHz.
7.
Verify that the 100kHz DMM reading is within ±1dB of the reading in step 5.
If your DMM does not have a dB function, you can calculate the variation as
follows: dB = ±20 log(I
1
/I
2
), where I
1
is the higher of the two readings.
8.
After testing, first turn off the output, then disconnect the test equipment.
Figure 16-4
Connections for waveform function amplitude flatness
NOTE
Digital Multimeter (DMM) input impedance varia-
tions may affect the accuracy of amplitude flat-
ness measurements.
High
Low
Output
6221
Digital Multimeter
(Measure AC Current)
Input
Amps
Low
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