DOCUMENT SUBJECT TO U.S. EXPORT CONTROLS, COMPLIANCE APPROVIAL REQUIRED PRIOR TO DISTRIBUTION
IM4830, Page 12
8.2.3
Depress the two left hand keyboard switches simultaneously to re-initialize the unit. Confirm the default
settings: Frequency = 100 Hz, Sensitivity = 10.0 and g = 10.0.
8.3
Frequency Accuracy
8.3.1
Connect the frequency counter to the “mV” output BNC connector. Set the 4830A sensitivity to
10.0 and the “g” level to 100.0. Measure and record the actual frequency output for the following
displayed frequencies: 1.0, 10.0, 100.0, 1000.0, and 10,000 Hz. Limits: ±1%.
8.3.2
Measure and record the actual frequency output for the following frequencies: 111, 222, 333, 444,
555, 666, 777, 888, and 999 Hz. Limits: ±1%.
8.3.3
Connect the frequency counter to the “TACH” output socket. Set the 4830A frequency to 100.0 Hz.
Measure and record the output frequency for the following “Ratio” settings; 1.0, 10.0 and 100.0.
Limits are ± 1%.
Verify “Tach” Output is 5 Volts peak to peak
8.4
Amplitude Accuracy (mV OUTPUT)
8.4.1
Connect a true RMS voltmeter and an oscilloscope to the “mV” output socket. Set the 4830A
frequency to 100.0 Hz and the sensitivity to 10.0. Measure and record the mV output for the
following “g” levels; limits ± 1%.
g Level
mV Output
Limits
10.0
70.7 mVrms
69.99 – 71.41
100.0
707.0 mVrms
699.9 – 714.1
1000.0
7070.0 mVrms
6999 - 7141
Note: Levels < 100 mV pk (70.7 mV Rms) will be affected by noise.
8.4.2 If the measurement results exceed the prescribed limits (see above table), re-adjust the
unit using the following method. Set conditions as per paragraph 8.3.1 and with the “g”
level set for 100.0. Adjust RV1 on the analog output board (see fig 3 for the location of
the potentiometer) ) to obtain 707.0 mVrms at the “mV” output socket.
8.4.3 Re-adjust the 4830A sensitivity to 1.0. Measure and record the mV output for the
following g levels; limits
±
1%.
g Level
mV Output
Limits
111.0
78.49
77.71 – 79.27
222.0
156.98
155.4 – 158.6
333.0
235.47
233.1 – 237.8