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4.7 DETECTOR CONNECTIONS
The output signal from the detector is typically connected to the Channel "A" signal input BNC
connector on the front of the SR810. This connector may accept either current or voltage signals.
The B output from the preamp (preamp ground) may be connected to the B input of the SR810. In
this case, use A-B as the input configuration. Be sure to twist the A and B cables to avoid
differential noise pickup between the cables.
Unamplified detectors provide a current signal, while amplified detectors provide a voltage signal.
If the signal exceeds the maximum which can be read by the SR810, the "OVLD" indicator
illuminates. The SR810 has greater dynamic reserve when reading voltage signals, so the LIDA-
compatible detectors offered by Oriel are all amplified models. Additionally, Oriel offers the 70310
stand-alone current preamplifier to use with unamplified detectors or photomultiplier tubes.
Oriel's amplified detectors and stand-alone current preamplifier require a power source to operate.
The "PREAMP" connection on the back of the SR810 is able to provide the power required. It
must be utilized with Oriel cable model CBL-70054-LIDA only. The user of any other Oriel cable
will damage the amplifier circuit and void the warranty on the detector or stand-alone preamplifier.
This power cable, as well as a BNC signal cable, are included with all LIDA-compatible detectors
offered by Oriel. For other setups, the CBL-70054-LIDA may be purchased separately. To use
this power cable with the model 70310 current preamplifier, the cable's mini-DIN connector can be
cut off and the stripped wire ends may be installed into the preamplifier's terminal block.
Note: the SR810 does NOT compensate for the gain of the preamp. The SR810 sets both
preamps to their maximum gains. Measurements made by the SR810 with a preamp should be
divided by the gain of the preamp.
Figure 5: Detector Signal Output Connection
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