16-10 Performance Verification
Model 6220/6221 Reference Manual
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Frequency accuracy
1.
With the power off, connect the frequency counter to the Model 6221
OUTPUT jack, as shown in
. 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)
50
W
Function
Input
High
Low
Shielded
Enclosure
50
W
Resistor
Note: If the frequency counter has a 50
W
input impedance,
the 50
W
resistor should not be necessary.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
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