diff --git a/site_ansto/instrument/config/hmm/hmm_configuration_common_1.tcl b/site_ansto/instrument/config/hmm/hmm_configuration_common_1.tcl
index 5643f557..c3627312 100644
--- a/site_ansto/instrument/config/hmm/hmm_configuration_common_1.tcl
+++ b/site_ansto/instrument/config/hmm/hmm_configuration_common_1.tcl
@@ -50,6 +50,7 @@ namespace eval histogram_memory {
           hmm configure ratemap_xy_total 321
           hmm configure maximum_period 0
           hmm configure fat_frame_frequency 50
+	  hmm configure fat_clock_scale 1000
           foreach bm $::counter::isc_beam_monitor_list {
             set bm_num [string index $bm end]
               if [string is integer $bm_num] {