Model 3030 & 3030E Series Technical Manual Section 7
Ludlum Measurements, Inc. Page 23 November 2017
Parameters/Change Password: This selection changes the current
password.
Headers 1–6: These are six user-defined fields to place general information.
These are limited to 15 characters.
Calibration Due Date: This date is checked when instrument is turned on. If
current date is past this date, “OUTCAL” is displayed on the instrument.
Setting Dipswitch 2 to the “ON” position will disable this feature.
3030 Date/Time: This is the current date and time from the last time data
was read from the instrument.
User Defined Time (min): In addition to the seven preset count times, there
is a user-defined count time that can be set from the PC. This is the count
time that will be used when the instrument is switched to the “PC” position.
Alpha, Beta, Alpha + Beta Alarms: These are the alarm settings. A value of
999999 will disable the alarm. If the unit is in CPM, the alarms are in CPM.
If the instrument is in DPM, the alarms are in DPM. It is up to the user to
make sure that the alarms are set accordingly to the count mode.
High Voltage: This field displays the current high-voltage setting. The high
voltage may be adjusted from 0 to 2000 Vdc.
Loss of Count Timer: If the detector receives no counts on the beta channel
after the time expires, the display will show “LOC FAIL” and will not
operate until reset. This timer is reset whenever a count is received.
Count Mode: The model 3030 can display the readings in raw scaler counts,
CPM, or DPM. If dipswitch 1 is “OFF,” the unit is always in scaler mode.
The Ludlum Model 3030 can operate as a traditional radiation scaler,
displaying measurements in terms of CPM (counts per minute). It can also
be programmed to automatically adjust and display the measurements in
DPM (disintegrations per minute). By knowing what the efficiency is for
alpha and beta particles, the Model 3030 is able to divide measurements by
the known efficiency and display in DPM. The DPM mode may be easier
for users, since many regulations and limits are expressed in terms of DPM.
In raw scaler mode, the count obtained is the actual counts received during
that count time. In CPM mode, the counts are adjusted for the count time.
In DPM mode, the counts are adjusted for count time and efficiency. For
example:
Count Time = 0.1 minutes (6 seconds)
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