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Canon T2i, 7D, 1D Mark IV
Different camera platforms, with varying gain lineups and firmware
implementations, vary in terms of their required input signal level to optimize
signal-to-noise while also having sufficient margin to headroom distortion.
The factory HI and LO meter settings try to balance the needs across platforms.
But, the may not be optimal for every camera.
This section will describe some simple steps to get the DT454 meter more
precisely calibrated to the gain needs of your camera while using the AGC Disable
feature of the DT454.
We will use the known output signal level of the AGC Disable’s noise signal for
calibration. So, we will take the output of the DT454 with the noise signal, and
feed that back to the DT454 input. Then, you will adjust a potentiometer to a pre-
determined position and signal level. Then, you will use a small screwdriver to
adjust one of the meter potentiometers, so the meter is calibrated to that signal
level.
Follow these steps:
NOTE: We have posted a video on our website which may be helpful to illustrate
steps in general. However, please refer to this user Manual for the exact details.
a. CALIBRATE THE DT454 METER:
a. Start with all of the front panel potentiometers (volume controls for
XLR-L, XLR-R, etc) turned all of the way down (counterclockwise).
b. Take the stereo minijack cable, and connect one end to the DT454
OUT minijack, and the other end to the DT454 TIP / RING INPUT
minijack.
c. Set MONO / STEREO to STEREO, and PAN TO L / NORM to NORM.
d. Set the AGC Disable switch to the NOISE setting.
e. Set the GAIN for the RING/TIP INPUT to the LO setting on the bottom
of the DT454.
f. On the front panel, turn the RING-R potentiometer (volume control) to
the eleven o’clock position.
g. Set the METER switch to the LO position on the bottom of the DT454.