Brymen BM839 User Manual page 23

High-Update Record mode
DC functions update interval 100ms, nominal response to 85%;
For changes > 200ms in duration:
6000-count mode: Specified accuracy  12 counts
20000-count mode: Specified accuracy  120 counts
AC functions update interval 120ms, nominal response to 85%;
For changes > 350ms in duration and input >5% of range:
6000-count mode: Specified accuracy  30 counts
20000-count mode: Specified accuracy  300 counts
Crest mode
DC/AC functions
For changes > 5ms in duration:
6000-count mode only: Specified accuracy  150 counts
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