Model 702i and 711i
Technical Manual
Section 4
Ludlum Measurements, Inc.
4-2
December 2018
Power
Batteries:
Internal, 8 x 2450 mAh NiMH AA batteries
AC:
35W 12V or 15V universal AC adapter
(depending on system revision)
Auto:
9V fused accessory adapter
Gamma Detector
702i Crystal:
5.1 x 3.8 cm (2 x 1.5 in.) NaI
711i Crystal:
3.8 x 3.8 cm (1.5 x 1.5 in.) LaBr
Detector Sensitivity
702i:
775 cpm/µR/hr (
137
Cs)
711i:
650
cpm/µR/hr (
137
Cs)
Energy Resolution
702i:
7-8% (
137
Cs)
711i:
3.5-5% (
137
Cs)
Energy Range
18 keV to 3 MeV
Bias
Integral HV supply from 0–1200 V
Actual operating voltage calibrated to each detector
Connection
Switchcraft 6-pin weathertight connector
Dimensions
25.1 x 11.4 x 22.1 cm (9.9 x 4.5 x 8.7 in.) (H x W x D) with handle
Weight
702i:
2.4 kg (5.2 lb)
711i:
2.2 kg (4.8 lb)
