Model 26-1 Frisker User’s Manual Section 5
Ludlum Measurements, Inc. Page 5-8 April 2017
this parameter will be skipped. Otherwise, units will be the same as selected
earlier with Secondary Count Units. Secondary Count Units of c or d will not be
displayed, but mR or µSv will. The ALARM LCD Segment will be on to
indicate an Alarm parameter. Set this Alarm Point to 000 to disable. Available
values are:
Ones Place (0-9)
Tens Place (0-9)
Hundreds Place (0-9)
Thousands Place (1 on or off)
Number of Decimal Places (0, 1, or 2– only available if k selected)
Range (k on or off – not available for mR or µSv)
Note: If the Secondary Count Units has changed to a value other than that used
to previously set this Alarm Point, the Alarm Point will be reset to 000.
Response Time (Default 0=auto) – Use ON/ACK to select the value to be
adjusted and MODE to adjust the value. Setting the Response Time to a fixed
value is useful primarily when performing surveys to a fixed MDA (Minimum
Detectable Activity) level. Setting the Response Time to 0 will enable the Auto-
Response mode for the Model 26-1 (see the next parameter). Available values
for the Response Time (in seconds) are:
Ones Place (0-9)
Tens Place (0-6, 6 forces max Response Time of 60)
Auto-Response Rate (Default F) - Use MODE to select Fast (F) or Slow (S).
When operating in Auto-Response mode, the Model 26-1 will vary the
Response Time based on the Auto-Response Rate selected (Fast or Slow) and
the current Count Rate. The following table shows the response time for
different count rates when these auto response modes are chosen:
Count Rate
Auto Response
Time – Fast
(Seconds)
Auto Response
Time – Slow
(Seconds)
Less than 3 kcpm (50 cps) 5 10
Between 3 kcpm and 4 kcpm (67 cps) 4 8
Between 4 kcpm and 6 kcpm (100 cps) 3 6
Between 6 kcpm and 12 kcpm (200 cps) 2 4
More than 12 kcpm 1 2
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