Universal Output; Usb Interface; Analogue Output; Adjusting The Instrument - Tintometer Lovibond SD 325 Con Instrucciones

7 Universal output

The universal output can be deactivated, used as a serial interface (factory setting:
<SEt Out> = SEr), or used as an analogue output. If not in use, we recommend deactivating
the output (<Set Out> = off) to keep battery consumption as low as possible.
Plug assignment
4: External supply (+5 V, 50 mA)
3: GND
4 1
2: TxD / RxD (3.3 V logic)
3 2
1: +U
DAC

7.1 USB interface

To use the universal output as a USB interface, set the output <SEt Out> in the extended
configuration menu to Out = SEr.
With a USB 300 galvanically separate interface converter (accessory), the instrument
can be connected directly to the USB interface of a PC. If the instrument is operated
with the USB 300 interface adapter, the instrument draws its power from this interface.
This interface can also be used to transfer and analyse data, and also to operate the logger
function. The following software package is available for this: GSOFT3050 (accessory).
The transfer takes place in a binary-encoded format and is protected against transmission
errors with sophisticated security mechanisms (CRC).

7.2 Analogue output

To use the universal output as an analogue output, set the output <SEt Out> in the extended
configuration menu to Out = dAC.
An analogue voltage of 0 - 1 V can be picked up at the universal output socket.
The analogue output can be scaled very easily with dAC.0 and dAC.1. Care should
be taken to ensure that the analogue output is not loaded too heavily, since otherwi-
se the output value can be rendered incorrect and the instrument's power consump-
tion increases accordingly. Loads of up to around 10 kΩ are no cause for concern.
If the display falls below the value set with dAC.0, 0 V is output.
If the display exceeds the value set with dAC.1, 1 V is output.
In the event of an error (Err.1, Err.2, etc.), a voltage just slightly over 1 V is output at the
analogue output.

8 Adjusting the instrument

The measurement inputs for the voltage and temperature measurement can be adjusted with
Offset and Scale. Criterion: There are reliable references available (e.g. iced water, controlled
precision baths, or similar).
If adjustment is carried out (deviation from the factory setting), this is indicated when the
instrument is switched on with the message "Corr".
The default setting for zero-point and slope values is "oFF" = 0.00, i.e. no correction is made.
• Offset correction only: Displayed value = measured value – offset
• Offset and slope correction: Display = (measured value – OFFS) * (1 + SCAL / 100)
SD_325_Con_1 06/2020
, analogue output
Only suitable
!
adapter
cables are
permitted
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