Reference Multimeter and 8 ½ Digit Multimeter
Functions
29
• Frequency path coupling: The frequency path coupling can be AC or DC if
the Signal path coupling, impedance (above) is set to any of the dc settings.
Otherwise, only ac is available and this submenu is not operational.
• Frequency path bandwidth limit: Choose (OFF) or (ON).
Reduces noise in the frequency counter signal path. If there is excessive
noise observed, turn the bandwidth limit ON for signals <70 kHz.
• Counter Gate: Set to:
•
(Auto)
• (1ms)
• (10ms)
• (100ms)
• (1s)
The counter gate auto times are related to the RMS filter and shown in Table 7.
Table 7. Counter Gate Auto Times
RMS Filter Gate Times
0.1 Hz 1 s
1 Hz 1 s
10 Hz 100 ms
40 Hz 100 ms
100 Hz 10 ms
1 kHz 10 ms
In auto, the gate time is the longest of the cardinal times that will not reduce the
reading rate. If the gate time is set manually, the reading rate is the longest of
RMS filter and gate times.
ACI measurements wait for both the RMS filter settling and the counter gate,
whichever is the longer. If you select long counter gate times, this may slow the
reading rate. The auto times are chosen to not slow the read rate.
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