Nikon D90 User Manual page 19

Calibration
When using the housing at altitude, the ambient pressure can be a lot lower
than 1.015 hPa (factory settings). In this case the unit has to be calibrated
in order to have a minimum of 250 hPa pressure difference before the
green LED is activated. To calibrate the unit, the HugyCheck calibration
jumper is required.
There are two different ways of calibrating the unit:
1. Calibrating at altitude (< 1.015 hPa)
2. Calibrating at sea level (1.015 hPa)
1. Calibrating at altitude (< 1.015 hPa)
When this unit is used at altitide, the reference pressure of 1.015 hPa (fac-
tory settings) has to be changed to the ambient pressure at altitude. To
calibrate the unit at altitude:
- first remove the battery from the camera support;
- remove the hot shoe cable from the Hugycheck system (J1 or J2);
- install the HugyCheck calibration jumper on J2 (convert);
- install the battery in the camera support;
The red LED will burn, indicating that the reference pressure has been set to
ambient pressure (< 1.015 hPa).
- remove the battery from the camera support;
- remove the HugyCheck calibration jumper on J2 (convert);
- install the hot shoe cable on the Hugycheck system (J1 or J2);
- install the battery in the camera support.
The system in now ready to be used at altitude.
Hugyfot Housing for
The HugyCheck calibration jumper has a 'bridge'
between pin 6 and pin 7.
To calibrate at altitude, the HugyCheck calibration
jumper is to be installed on J2 (convert).
Nikon D90 19 User manual