16-10 Performance Verification Model 6220/6221 Reference Manual
Return to Section 16 topics
Frequency accuracy
1. With the power off, connect the frequency counter to the Model 6221
OUTPUT jack, as shown in Figure 16-5. Also connect the shorting connec-
tor to the INTERLOCK 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.
3. Select the sine wave function by pressing the WAVE key.
4. Set the Model 6221 amplitude (AMPL) to 20mA on the 20mA range, and
set the frequency (FREQ) to 1kHz. Turn on the output.
5. Verify that the counter frequency reading is between 0.9999kHz and
1.0001kHz.
6. After testing, first turn off the output, then disconnect the test equipment.
Figure 16-5
Connections for waveform function frequency accuracy
High
Low
Output
6221
Frequency Counter
(Measure 1kHz Sine Wave)
50W
Function
Input
High
Low
Shielded
Enclosure
50W Resistor
Note: If the frequency counter has a 50W input impedance,
the 50W resistor should not be necessary.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
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