7451A/7461A/7461P Digital Multimeter Operation Manual
7.1.6 Frequency Measurement (FREQ)
7-14
Additional error depending on the AC filter
Integration time: 10 PLC
Additional error depending on the integration time
AC filter: SLOW
Maximum allowable applied current
Between mA and COM terminals
3A (DC or ACrms)
Input protection
By using the 3.15 A/250 V fast blow fuse which is compliant with
IEC60127-2 sheet1
The fuse can be changed on the rear panel.
7.1.6
Frequency Measurement (FREQ)
•
7451A, 7461A, 7461P
Measurement method
Reciprocal
Input signal voltage range 100 mVrms to 700 Vrms (However, the input signal is restricted to the
maximum allowable applied voltage.)
Frequency bandwidth
Additional error (% of reading)
Response time *1
20 Hz - 45 Hz 45 Hz - 100Hz 100 Hz - 1 kHz More than 1 kHz
SLOW
20 Hz - 5 kHz
0
0
0
0
3 s
MED
20 Hz - 5 kHz
0.7
0.23
0.04
0
500 ms
FAST
300 Hz - 5 kHz
-
-
0.1
0
100 ms
*1
Time until the measurement value reaches within 0.1% of the final value in the same range
Integration time
Additional error(
digit)
100
s
IT < 200
s
-
In a 3 1/2-digit display
2
200
s
IT
2 ms
Includes FAST1 and FAST2. In a 4 1/2-digit display
10
2.01 ms < IT < 9.99 ms
-
In a 5 1/2-digit display
20
10 ms < IT < 1 PLC
-
In a 5 1/2-digit display
20
1 PLC
IT < 10 PLC
-
In a 5 1/2-digit display
20
10 PLC < IT
10 s
-
In a 5 1/2-digit display
2
Measurement frequency range
Measurement accuracy
(Sinusoidal wave)
1 Hz - 10 Hz
0.05% of reading
10 Hz - 300 kHz
0.02% of reading
