Datasheet

13 | Keysight | 53131A/132A/181A Counters - Data Sheet
Graph 1:
Keysight 53131A/181A–Worst
case RMS resolution
7
(Automatic or external arming)
The graphs may also be used to compute
errors for period measurements. To
find the period error (DP), calculate the
frequency of the input signal (F = 1/P)
and find the frequency error (DF) from the
chart.
Then calculate the period error as:
∆P = × P
F
∆F
Graph 2:
Keysight 53131A/181A–Worst
case RMS resolution
7
(Time or digits arming)
1E + 02
1E + 00
1E – 02
1E – 04
1E – 06
1E – 08
1E – 10
10 100 1000 10000 1E + 05 1E + 06 1E + 07 1E + 08 1E + 09 1E + 10
Remarks:
Auto armed
Gate time:
1 ms
10 ms
100 ms
1 s
10 s
Frequency error (Hz)
Input frequency (Hz)
E + 02
1E + 00
1E – 02
1E – 04
1E – 06
1E – 08
1E – 10
10 100 1000 10000 1E + 05 1E + 06 1E + 07 1E + 08 1E + 09 1E + 10
Remarks:
Gate time:
1 ms
10 ms
100 ms
1 s
10 s
Frequency error (Hz)
Input frequency (Hz)
Differential channel error
The differential channel error term stated in several systematic uncertainty equations accounts
for channel-to-channel mismatch and internal noise. This error can be substantially reduced by
performing a TI calibration (accessible via the utility menu) in the temperature environment in
which future measurements will be made.