Fluke 74X Series, Calibration Manual

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74X Series
Calibration Manual
22
Frequency Source
Proceed as follows to verify the Frequency Source function:
1. Connect the UUT to the PM6666 counter as shown in Figure 10.
2. Set the UUT to Source, Frequency, 1.000 Vpp , Square Wave, at 5Hz.
3. Observe that the reading on the PM6666 is within the range shown in Table 12.
4. Use the ScopeMeter to check for a positive square wave, with a 50% duty-cycle
(
±
5%), and 1.0V peak amplitude. Observe that the amplitude is within the range
shown in Table 12. The HP3458A can also be used to check the RMS value of the
signal.
5. Continue through the test points, verifying compliance to specifications.
6. At the last test point, change the UUT to source a Sine Wave. Verify the correct
frequency, waveform, and amplitude.
7. When you are finished, press
c
twice on the UUT to set the Source function to off.
This saves battery life.
TC
mA mA V V
RTD
RTD
SOURCE 300V
MAX
30V
MAX
30V
MAX
30V
MAX
MEAS
CAT
DC-120 MHz
FLUKE 74X
PM 6666 TIMER/COUNTER
FLUKE SCOPEMETER
93 50 MHz SCOPEMETER
Use Channel A
BNC Input
gb11f.eps
Figure 10. Frequency Source Verification Connections
Table 12. Frequency Source Verification Points
UUT
Range
Frequency
@ 1 Vpp
Minimum
Freq.
Maximum
Freq.
Amplitude Tolerance
+/- mV peak +/- mV RMS
10.999 Hz 5 Hz 4.99 5.01 80 40
109.99 Hz 50 Hz 49.9 50.1 80 40
1099.9 Hz 500 Hz 499.9 500.1 80 40
21.999 kHz 10 kHz 9.998 10.002 150 75
50 kHz 50 kHz 49.995 50.005 350 175
Sine Wave
1099.9 Hz 1000 Hz 999.9 1000.1 80 28.29