TRD-series densitometers

DensitometerVarious Models to suit your Specific Requirements

The Heiland TRD series of densitometers include the TRD-2, a basic transmission and reflection instrument for everyday photographic applications, the TRD-4 which can be used for calibrating RIPs and inkjet printers, and the TRD-Z which is designed for Zone System users and incorporates several time-saving features designed specifically for the Zone System.

Other models are available for more specialised applications; please contact us for full details.

Please note: prices are shown in Euros due to the present volatility in exchange rates. Please confirm prices before ordering.

TRD-2 | TRD-4 | TRD-Z

Heiland TRD-2 Black and White Densitometer

The TRD-2 densitometer is designed for use in general photographic applications such as the calibration of b&w films and variable contrast papers. It can also be used for the process control of X-ray films. It is equipped with a fixed aperture, the diameter of which can be selected at the time of order, or interchangeable apertures as an option. The TRD-2’s display shows density in log.D units. See the specification for full details.


TRD-2 | TRD-4 | TRD-Z | Options

Heiland TRD-4 Black and White Densitometer with % Dot Density Function

This model is mainly used for pre-press and press applications such as the calibration of RIPs and printers. After setting Dmin and Dmax, densities can be displayed in units of percentage dot density or in log.D units.


TRD-2 | TRD-4 | TRD-Z | Options

Heiland TRD-Z Black and White Densitometer with Zone System Functions

Designed specifically for Zone System applications the TRD-Z acts like an electronic zone ruler, displaying reflection measurements in terms of ten zones between Dmin and Dmax, and transmission measurements in zones according to selected film development.

In the reflection measuring mode (print analysis), the range of grey tone values of a print are classified into ten different zones with ten increments each. Pressing the "minimum" button while measuring paper-base white will give a display of zone 10.0. Conversely, reading the lowest reflectance and pressing "maximum" will show a reading of zone 0.0 and is subsequently stored as such. In subsequent measurements within the same picture, the grey tone values are given in 1/10 zones. In the mid-range of values, for example, a reading could show "zone 5.3". The TRD-Z then serves to replace a visual zone ruler by exact figures, in effect becoming an extremely accurate "electronic zone ruler".

For transmission measuring (negative analysis), the zone system refinement of variable film development can be taken into consideration. Separate measuring modes are provided for each of the developing variants: "N" (normal); N +1; N +2; N -1; N -2. The slope of each individual characteristic curve is taken into account by computer calculation. In practical use, here's how it may be helpful:

The instrument is first nulled by placing a unexposed portion of the negative ("film base plus fog") under the probe and pressing the "minimum" button. The display will show zone "0.0". Now for example, if an area with a density of log 1.02 above basic fog is measured and if the processing category "N" is selected, the displayed zone would be 6.0. For the other processing categories, the following zone values will be indicated (assuming an equal density):
N+2 = 4.0; N +1 = 5.0; N-1 = 7.0; N -2 = 8.0.

The TRD Z replaces "graytone guessing" with exact measurements. These accurate values then give the user a clear and easy way to appreciate the benefits of the zone system.


TRD-2 | TRD-4 | TRD-Z | Options