Keysight 34972A - Custom A;D Integration Time

Features and Functions 4
Keysight 34970A/34972A User’s Guide 133
Custom A/D integration time
Integration time is the period of time that the instrument’s
analog-todigital (A/D) converter samples the input signal for a measurement.
Integration time affects the measurement resolution (for better resolution, use a
longer integration time) and measurement speed (for faster measurements, use a
shorter integration time).
– Integration time is specified in number of power line cycles (PLCs). Select from
0.02, 0.2, 1, 2, 10, 20, 100, or 200 power line cycles.
The default is 1 PLC.
– Only the integral number of power line cycles (1, 2, 10, 20, 100, or 200 PLCs)
provide normal mode (line frequency noise) rejection.
– You can also specify integration time directly in seconds (this is called aperture
time). Select a value between 400 µs and 4 seconds, with
10 µs resolution.
– The only way to control the reading rate for AC measurements is by changing
the channel delay (see page 119) or by setting the AC filter to the highest
frequency limit (see page 143).
– The specified integration time is used for all measurements on the selected
channel. If you have applied Mx+B scaling or have assigned alarms to the
selected channel, those measurements are also made using the specified
integration time. Measurements taken during the Monitor function also use the
specified integration time.
– The following table shows the relationship between integration time,
measurement resolution, number of digits, and number of bits.
Integration Time Resolution Digits Bits
0.02 PLC
0.2 PLC
1 PLC
2 PLC
10 PLC
20 PLC
100 PLC
200 PLC
<0.0001 x Range
<0.00001 x Range
<0.000003 x Range
<0.0000022 x Range
<0.000001 x Range
<0.0000008 x Range
<0.0000003 x Range
<0.00000022 x Range
4½ Digits
5½ Digits
5½ Digits
6½ Digits
6½ Digits
6½ Digits
6½ Digits
6½ Digits
15
18
20
21
24
25
26
26